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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  
  "http://www.w3.org/TR/html4/loose.dtd">  
<html > 
<head><title>33 Commands of the System Layer</title> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<meta name="generator" content="TeX4ht (http://www.cis.ohio-state.edu/~gurari/TeX4ht/mn.html)"> 
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<!-- html --> 
<meta name="src" content="pgfmanual.tex"> 
<meta name="date" content="2005-10-23 18:34:00"> 
<link rel="stylesheet" type="text/css" href="pgfmanual.css"> 
</head><body 
>
   <div class="crosslinks"><p class="noindent">[<a 
href="pgfmanualse34.html" >next</a>] [<a 
href="pgfmanualse32.html" >prev</a>] [<a 
href="pgfmanualse32.html#tailpgfmanualse32.html" >prev-tail</a>] [<a 
href="#tailpgfmanualse33.html">tail</a>] [<a 
href="pgfmanual.html#pgfmanualse33.html" >up</a>] </p></div>
   <h3 class="sectionHead"><span class="titlemark">33   </span> <a 
 id="x34-31000033"></a>Commands of the System Layer</h3>
<!--l. 11--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.1   </span> <a 
 id="x34-31100033.1"></a>Beginning and Ending a Stream of System Commands</h4>
<!--l. 13--><p class="noindent">A &#8220;user&#8221; of the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>&nbsp;system layer (like the basic layer or a frontend) will interface with the system layer by calling a
stream of commands starting with <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@</span></span></span>. From the system layer&#8217;s point of view, these commands form a long
stream. Between calls to the system layer, control goes back to the user.
<!--l. 19--><p class="indent">   The driver files implement system layer commands by inserting <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\special</span></span></span> commands that implement the desired
operation. For example, <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span> will be mapped to <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\special{pdf:</span><span 
class="cmtt-10">&nbsp;S}</span></span></span> by the driver file for
<span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">pdftex</span></span></span>.
<!--l. 24--><p class="indent">   For many drivers, when such a stream of specials starts, it is necessary to install an appropriate transformation
and perhaps perform some more bureaucratic tasks. For this reason, every stream will start with a
<span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@beginpicture</span></span></span> and will end with a corresponding ending command.
<!--l. 30--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox403"><span 
class="cmtt-10">\pgfsys@beginpicture</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311001"></a>
     <!--l. 31--><p class="noindent">Called at the beginning of a <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">{pgfpicture}</span></span></span>. This command should &#8220;setup things.&#8221;
     <!--l. 34--><p class="noindent">Most drivers will need to implement this command. </dd></dl>
<!--l. 37--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox404"><span 
class="cmtt-10">\pgfsys@endpicture</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311002"></a>
     <!--l. 38--><p class="noindent">Called at the end of a pgfpicture.
     <!--l. 40--><p class="noindent">Most drivers will need to implement this command. </dd></dl>
<!--l. 43--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox405"><span 
class="cmtt-10">\pgfsys@typesetpicturebox</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">box</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311003"></a>
     <!--l. 44--><p class="noindent">Called <span 
class="cmti-10">after  </span>a <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">{pgfpicture}</span></span></span> has been typeset. The picture will have been put in box <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">box</span><span 
class="cmsy-10">&gt;</span>. This
     command should insert the box into the normal text. The box <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">box</span><span 
class="cmsy-10">&gt; </span>will still be a &#8220;raw&#8221; box that
     contains only the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\special</span></span></span>&#8217;s that make up the description of the picture. The job of this command is
     to resize and shift <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">box</span><span 
class="cmsy-10">&gt; </span>according to the baseline shift and the size of the box.
     <!--l. 52--><p class="noindent">This command has a default implementation and need not be implemented by a driver file. </dd></dl>
<!--l. 56--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox406"><span 
class="cmtt-10">\pgfsys@beginpurepicture</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311004"></a>
     <!--l. 57--><p class="noindent">This  version  of  the  <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@beginpicture</span></span></span> picture  command  can  be  used  for  pictures  that  are
     guaranteed not to contain any escaped boxes (see below). In this case, a driver might provide a more
     compact version of the command.
     <!--l. 62--><p class="noindent">This command has a default implementation and need not be implemented by a driver file. </dd></dl>
<!--l. 66--><p class="indent">
                                                                                         
                                                                                         
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox407"><span 
class="cmtt-10">\pgfsys@endpurepicture</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311005"></a>
     <!--l. 67--><p class="noindent">Called at the end of a &#8220;pure&#8221; <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">{pgfpicture}</span></span></span>.
     <!--l. 69--><p class="noindent">This command has a default implementation and need not be implemented by a driver file. </dd></dl>
<!--l. 73--><p class="indent">   Inside a stream it is sometimes necessary to &#8220;escape&#8221; back into normal typesetting mode; for example to insert
some normal text, but with all of the current transformations and clippings being in force. For this escaping, the
following command is used:
<!--l. 78--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox408"><span 
class="cmtt-10">\pgfsys@hbox</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">box number</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311006"></a>
     <!--l. 79--><p class="noindent">Called to insert a (horizontal) TeX box inside a <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">{pgfpicture}</span></span></span>.
     <!--l. 82--><p class="noindent">Most drivers will need to (re-)implement this command. </dd></dl>
<!--l. 85--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox409"><span 
class="cmtt-10">\pgfsys@hboxsynced</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">box number</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-311007"></a>
     <!--l. 86--><p class="noindent">Called  to  insert  a  (horizontal)  TeX  box  inside  a  <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">{pgfpicture}</span></span></span>,  but  with  the  current  coordiante
     transformation matrix synced with the canvas transformation matrix.
     <!--l. 90--><p class="noindent">This command should do the same as if you used <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgflowlevelsynccm</span></span></span> followed by <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@hbox</span></span></span>.
     However, the default implementation of this command will use a &#8220;TeX-translation&#8221; for the translation
     part of the transformation matrix. This will ensure that hyperlinks &#8220;survive&#8221; at least translations. On
     the other hand, a driver may choose to revert to a simpler implementation. This is done, for example,
     for the <span 
class="cmcsc-10"><small 
class="small-caps">S</small><small 
class="small-caps">V</small><small 
class="small-caps">G</small> </span>implementation, where a <span class="TEX">T<span 
class="E">E</span>X</span>-translation makes no sense. </dd></dl>
<!--l. 102--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.2   </span> <a 
 id="x34-31200033.2"></a>Path Construction System Commands</h4>
<!--l. 104--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox410"><span 
class="cmtt-10">\pgfsys@moveto</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-312001"></a>
     <!--l. 105--><p class="noindent">This command is used to start a path at a specific point (<span 
class="cmmi-10">x,y</span>) or to move the current point of the
     current path to (<span 
class="cmmi-10">x,y</span>) without drawing anything upon stroking (the current path is &#8220;interrupted&#8221;).
     <!--l. 110--><p class="noindent">Both <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x</span><span 
class="cmsy-10">&gt; </span>and <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y</span><span 
class="cmsy-10">&gt; </span>are given as <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimensions. It is the driver&#8217;s job to transform these to the coordinate
     system of the backend. Typically, this means converting the <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimension into a dimensionless
     multiple of <img 
src="pgfmanual34x.gif" alt="1-
72"  class="frac" align="middle">in. The function <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@sys@bp</span></span></span> helps with this conversion.
     <!--l. 116--><p class="noindent"><span 
class="cmti-10">Example: </span>Draw a line from (10pt<span 
class="cmmi-10">,</span>10pt) to the origin of the picture.
     <!--l. 118--><p class="noindent"><div class="obeylines-v"></div><!--tex4ht:inline--><div class="tabular"><table class="tabular" 
cellspacing="0" cellpadding="0"  
frame="void" id="TBL-573-" ><colgroup id="TBL-573-1g"><col 
id="TBL-573-1"></colgroup><tr  
 valign="baseline" id="TBL-573-1-"><td  align="left" style="white-space:nowrap; text-align:left;" id="TBL-573-1-1"  
class="td11">  <table class="minipage"><tr><td><div class="obeylines-v">
<br><span 
class="cmtt-8">\pgfsys@moveto{10pt}{10pt}</span>
<br><span 
class="cmtt-8">\pgfsys@lineto{0pt}{0pt}</span>
<br><span 
class="cmtt-8">\pgfsys@stroke</span></div>                                                                                                </td></tr></table> </td>
</tr></table></div>
     <!--l. 124--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 128--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox411"><span 
class="cmtt-10">\pgfsys@lineto</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-312002"></a>
     <!--l. 129--><p class="noindent">Continue the current path to (<span 
class="cmmi-10">x,y</span>) with a straight line.
     <!--l. 132--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
                                                                                         
                                                                                         
<!--l. 136--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox412"><span 
class="cmtt-10">\pgfsys@curveto</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmmi-10">x</span><sub ><span 
class="cmr-7">1</span></sub><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmmi-10">y</span><sub ><span 
class="cmr-7">1</span></sub><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmmi-10">x</span><sub ><span 
class="cmr-7">2</span></sub><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmmi-10">y</span><sub ><span 
class="cmr-7">2</span></sub><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmmi-10">x</span><sub ><span 
class="cmr-7">3</span></sub><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmmi-10">y</span><sub ><span 
class="cmr-7">3</span></sub><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-312003"></a>
     <!--l. 137--><p class="noindent">Continue the current path to (<span 
class="cmmi-10">x</span><sub ><span 
class="cmr-7">3</span></sub><span 
class="cmmi-10">,y</span><sub ><span 
class="cmr-7">3</span></sub>) with a B&eacute;zier curve that has the two control points (<span 
class="cmmi-10">x</span><sub ><span 
class="cmr-7">1</span></sub><span 
class="cmmi-10">,y</span><sub ><span 
class="cmr-7">1</span></sub>) and
     (<span 
class="cmmi-10">x</span><sub ><span 
class="cmr-7">2</span></sub><span 
class="cmmi-10">,y</span><sub ><span 
class="cmr-7">2</span></sub>).
     <!--l. 140--><p class="noindent"><span 
class="cmti-10">Example: </span>Draw a good approximation of a quarter circle:
     <!--l. 141--><p class="noindent"><div class="obeylines-v"></div><!--tex4ht:inline--><div class="tabular"><table class="tabular" 
cellspacing="0" cellpadding="0"  
frame="void" id="TBL-574-" ><colgroup id="TBL-574-1g"><col 
id="TBL-574-1"></colgroup><tr  
 valign="baseline" id="TBL-574-1-"><td  align="left" style="white-space:nowrap; text-align:left;" id="TBL-574-1-1"  
class="td11">  <table class="minipage"><tr><td><div class="obeylines-v">
<br><span 
class="cmtt-8">\pgfsys@moveto{10pt}{0pt}</span>
<br><span 
class="cmtt-8">\pgfsys@curveto{10pt}{5.55pt}{5.55pt}{10pt}{0pt}{10pt}</span>
<br><span 
class="cmtt-8">\pgfsys@stroke</span></div>                                                                                                </td></tr></table> </td>
</tr></table></div>
     <!--l. 147--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 151--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox413"><span 
class="cmtt-10">\pgfsys@rect</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">width</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">height</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-312004"></a>
     <!--l. 152--><p class="noindent">Append a rectangle to the current path whose lower left corner is at (<span 
class="cmmi-10">x,y</span>) and whose width and height
     in big points are given by <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">width</span><span 
class="cmsy-10">&gt; </span>and <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">height</span><span 
class="cmsy-10">&gt;</span>.
     <!--l. 156--><p class="noindent">This command can be &#8220;mapped back&#8221; to <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@moveto</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@lineto</span></span></span> commands, but it is
     included since <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;has a special, quick version of this command.
     <!--l. 160--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 164--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox414"><span 
class="cmtt-10">\pgfsys@closepath</span></span> </dt><dd 
class="description">
<a 
 id="dx34-312005"></a>
     <!--l. 165--><p class="noindent">Close the current path. This results in joining the current point of the path with the point specified
     by the last <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@moveto</span></span></span> operation. Typically, this is preferable over using <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@lineto</span></span></span> to the
     last point specified by a <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@moveto</span></span></span>, since the line starting at this point and the line ending at
     this point will be smoothly joined by <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@closepath</span></span></span>.
     <!--l. 172--><p class="noindent"><span 
class="cmti-10">Example: </span>Consider
     <!--l. 173--><p class="noindent"><div class="obeylines-v"></div><!--tex4ht:inline--><div class="tabular"><table class="tabular" 
cellspacing="0" cellpadding="0"  
frame="void" id="TBL-575-" ><colgroup id="TBL-575-1g"><col 
id="TBL-575-1"></colgroup><tr  
 valign="baseline" id="TBL-575-1-"><td  align="left" style="white-space:nowrap; text-align:left;" id="TBL-575-1-1"  
class="td11">  <table class="minipage"><tr><td><div class="obeylines-v">
<br><span 
class="cmtt-8">\pgfsys@moveto{0pt}{0pt}</span>
<br><span 
class="cmtt-8">\pgfsys@lineto{10bp}{10bp}</span>
<br><span 
class="cmtt-8">\pgfsys@lineto{0bp}{10bp}</span>
<br><span 
class="cmtt-8">\pgfsys@closepath</span>
<br><span 
class="cmtt-8">\pgfsys@stroke</span></div>                                                                                                </td></tr></table> </td>
</tr></table></div>
     <!--l. 180--><p class="noindent">and
     <!--l. 181--><p class="noindent"><div class="obeylines-v"></div><!--tex4ht:inline--><div class="tabular"><table class="tabular" 
cellspacing="0" cellpadding="0"  
frame="void" id="TBL-576-" ><colgroup id="TBL-576-1g"><col 
id="TBL-576-1"></colgroup><tr  
 valign="baseline" id="TBL-576-1-"><td  align="left" style="white-space:nowrap; text-align:left;" id="TBL-576-1-1"  
class="td11">  <table class="minipage"><tr><td><div class="obeylines-v">
<br><span 
class="cmtt-8">\pgfsys@moveto{0bp}{0bp}</span>
<br><span 
class="cmtt-8">\pgfsys@lineto{10bp}{10bp}</span>
<br><span 
class="cmtt-8">\pgfsys@lineto{0bp}{10bp}</span>
<br><span 
class="cmtt-8">\pgfsys@lineto{0bp}{0bp}</span>
<br><span 
class="cmtt-8">\pgfsys@stroke</span></div>                                                                                                </td></tr></table> </td>
</tr></table></div>
     <!--l. 189--><p class="noindent">The difference between the above will be that in the second triangle the corner at the origin will be
     wrong; it will just be the overlay of two lines going in different directions, not a sharp pointed
     corner.
     <!--l. 194--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
                                                                                         
                                                                                         
<!--l. 200--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.3   </span> <a 
 id="x34-31300033.3"></a>Canvas Transformation System Commands</h4>
<!--l. 202--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox415"><span 
class="cmtt-10">\pgfsys@transformcm</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">a</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">b</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">c</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">d</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">e</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">f </span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-313001"></a>
     <!--l. 203--><p class="noindent">Perform a concatenation of the canvas transformation matrix with the matrix given by the values <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">a</span><span 
class="cmsy-10">&gt;</span>
     to <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">f </span><span 
class="cmsy-10">&gt;</span>, see the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;or PostScript manual for details. The values <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">a</span><span 
class="cmsy-10">&gt; </span>to <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">d</span><span 
class="cmsy-10">&gt; </span>are dimensionless factors,
     <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">e</span><span 
class="cmsy-10">&gt; </span>and <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">f </span><span 
class="cmsy-10">&gt; </span>are <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimensions
     <!--l. 208--><p class="noindent"><span 
class="cmti-10">Example: </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@transformcm{1}{0}{0}{1}{1cm}{1cm}</span></span></span>.
     <!--l. 210--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 214--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox416"><span 
class="cmtt-10">\pgfsys@transformshift</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x displacement</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y displacement</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-313002"></a>
     <!--l. 215--><p class="noindent">This command will change the origin of the canvas to (<span 
class="cmmi-10">x,y</span>).
     <!--l. 217--><p class="noindent">This command has a default implementation and need not be implemented by a driver file.
     <!--l. 220--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 223--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox417"><span 
class="cmtt-10">\pgfsys@transformxyscale</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x scale</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y scale</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-313003"></a>
     <!--l. 224--><p class="noindent">This command will scale the canvas (and everything that is drawn) by a factor of <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">x scale</span><span 
class="cmsy-10">&gt; </span>in the
     <span 
class="cmmi-10">x</span>-direction and <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">y scale</span><span 
class="cmsy-10">&gt; </span>in the <span 
class="cmmi-10">y</span>-direction. Note that this applies to everything, including lines. So a
     scaled line will have a different width and may even have a different width when going along the <span 
class="cmmi-10">x</span>-axis
     and when going along the <span 
class="cmmi-10">y</span>-axis, if the scaling is different in these directions. Usually, you do not want
     this.
     <!--l. 232--><p class="noindent">This command has a default implementation and need not be implemented by a driver file.
     <!--l. 235--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 239--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.4   </span> <a 
 id="x34-31400033.4"></a>Stroking, Filling, and Clipping System Commands</h4>
<!--l. 241--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox418"><span 
class="cmtt-10">\pgfsys@stroke</span></span> </dt><dd 
class="description">
<a 
 id="dx34-314001"></a>
     <!--l. 242--><p class="noindent">Stroke the current path (as if it were drawn with a pen). A number of graphic state parameters influence
     this, which can be set using appropriate system commands described later.
     <!--l. 246--><p class="noindent">
         <dl class="description"><dt class="description">
     <span 
class="cmbx-10">Line width</span> </dt><dd 
class="description">The &#8220;thickness&#8221; of the line. A width of 0 is the thinnest width renderable on the device.
         On a high-resolution printer this may become invisible and should be avoided. A good choice is
         0.4pt, which is the default.
         </dd><dt class="description">
     <span 
class="cmbx-10">Stroke color</span> </dt><dd 
class="description">This special color is used for stroking. If it is not set, the current color is used.
                                                                                         
                                                                                         
         </dd><dt class="description">
     <span 
class="cmbx-10">Cap</span> </dt><dd 
class="description">The cap describes how the endings of lines are drawn. A round cap adds a little half circle to
         these endings. A butt cap ends the lines exactly at the end (or start) point without anything
         added. A rectangular cap ends the lines like the butt cap, but the lines protrude over the endpoint
         by the line thickness. (See also the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;manual.) If the path has been closed, no cap is drawn.
         </dd><dt class="description">
     <span 
class="cmbx-10">Join</span> </dt><dd 
class="description">This describes how a bend (a join) in a path is rendered. A round join draws bends using small
         arcs. A bevel join just draws the two lines and then fills the join minimally so that it becomes
         convex. A miter join extends the lines so that they form a single sharp corner, but only up to a
         certain miter limit. (See the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;manual once more.)
         </dd><dt class="description">
     <span 
class="cmbx-10">Dash</span> </dt><dd 
class="description">The line may be dashed according to a dashing pattern.
         </dd><dt class="description">
     <span 
class="cmbx-10">Clipping area</span> </dt><dd 
class="description">If a clipping area is established, only those parts of the path that are inside the clipping
         area will be drawn.</dd></dl>
     <!--l. 282--><p class="noindent">In addition to stroking a path, the path may also be used for clipping after it has been stroked. This will
     happen if the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@clipnext</span></span></span> is used prior to this command, see there for details.
     <!--l. 287--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 291--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox419"><span 
class="cmtt-10">\pgfsys@closestroke</span></span> </dt><dd 
class="description">
<a 
 id="dx34-314002"></a>
     <!--l. 292--><p class="noindent">This command should have the same effect as first closing the path and then stroking it.
     <!--l. 295--><p class="noindent">This command has a default implementation and need not be implemented by a driver file.
     <!--l. 298--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 302--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox420"><span 
class="cmtt-10">\pgfsys@fill</span></span> </dt><dd 
class="description">
<a 
 id="dx34-314003"></a>
     <!--l. 303--><p class="noindent">This command fills the area surrounded by the current path. If the path has not yet been closed, it
     is closed prior to filling. The path itself is not stroked. For self-intersecting paths or paths consisting
     of multiple parts, the nonzero winding number rule is used to determine whether a point is inside or
     outside the path, except if <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\ifpgfsys@eorule</span></span></span> holds - in which case the even-odd rule should be used.
     (See the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;or PostScript manual for details.)
     <!--l. 312--><p class="noindent">The following graphic state parameters influence the filling:
     <!--l. 314--><p class="noindent">
         <dl class="description"><dt class="description">
     <span 
class="cmbx-10">Interior rule</span> </dt><dd 
class="description">If <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\ifpgfsys@eorule</span></span></span> is set, the even-odd rule is used, otherwise the non-zero winding
         number rule.
         </dd><dt class="description">
     <span 
class="cmbx-10">Fill color</span> </dt><dd 
class="description">If the fill color is not especially set, the current color is used.
         </dd><dt class="description">
     <span 
class="cmbx-10">Clipping area</span> </dt><dd 
class="description">If a clipping area is established, only those parts of the filling area that are inside the
         clipping area will be drawn.</dd></dl>
     <!--l. 328--><p class="noindent">In addition to filling the path, the path will also be used for clipping if <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@clipnext</span></span></span> is used prior to this
     command.
     <!--l. 331--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 334--><p class="noindent">
                                                                                         
                                                                                         
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox421"><span 
class="cmtt-10">\pgfsys@fillstroke</span></span> </dt><dd 
class="description">
<a 
 id="dx34-314004"></a>
     <!--l. 335--><p class="noindent">First, the path is filled, then the path is stroked. If the fill and stroke colors are the same (or if they are
     not specified and the current color is used), this yields almost the same as a <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@fill</span></span></span>. However,
     due to the line thickness of the stroked path, the fill-stroked area will be slightly larger.
     <!--l. 341--><p class="noindent">In addition to stroking and filling the path, the path will also be used for clipping if <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@clipnext</span></span></span>
     is used prior to this command.
     <!--l. 344--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 348--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox422"><span 
class="cmtt-10">\pgfsys@discardpath</span></span> </dt><dd 
class="description">
<a 
 id="dx34-314005"></a>
     <!--l. 349--><p class="noindent">Normally, this command should &#8220;throw away&#8221; the current path. However, after <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@clipnext</span></span></span>
     has been called, the current path should subsequently be used for clipping. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@clipnext</span></span></span> for
     details.
     <!--l. 354--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 358--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox423"><span 
class="cmtt-10">\pgfsys@clipnext</span></span> </dt><dd 
class="description">
<a 
 id="dx34-314006"></a>
     <!--l. 359--><p class="noindent">This command should be issued after a path has been constructed, but before it has been stroked and/or
     filled or discarded. When the command is used, the next stroking/filling/discarding command will first
     be executed normally. Then, afterwards, the just-used path will be used for subsequent clipping. If
     there has already been a clipping region, this region is intersected with the new clipping path (the
     clipping cannot get bigger). The nonzero winding number rule is used to determine whether a point
     is inside or outside the clipping area or the even-odd rule, depending on whether <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\ifpgfsys@eorule</span></span></span>
     holds. </dd></dl>
<!--l. 374--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.5   </span> <a 
 id="x34-31500033.5"></a>Graphic State Option System Commands</h4>
<!--l. 376--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox424"><span 
class="cmtt-10">\pgfsys@setlinewidth</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">width</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315001"></a>
     <!--l. 377--><p class="noindent">Sets the width of lines, when stroked, to <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">width</span><span 
class="cmsy-10">&gt;</span>, which must be a <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimension.
     <!--l. 380--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 383--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox425"><span 
class="cmtt-10">\pgfsys@buttcap</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315002"></a>
     <!--l. 384--><p class="noindent">Sets the cap to a butt cap. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span>.
     <!--l. 386--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 389--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox426"><span 
class="cmtt-10">\pgfsys@roundcap</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315003"></a>
     <!--l. 390--><p class="noindent">Sets the cap to a round cap. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span>.
     <!--l. 392--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
                                                                                         
                                                                                         
<!--l. 395--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox427"><span 
class="cmtt-10">\pgfsys@rectcap</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315004"></a>
     <!--l. 396--><p class="noindent">Sets the cap to a rectangular cap. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span>.
     <!--l. 398--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 401--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox428"><span 
class="cmtt-10">\pgfsys@miterjoin</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315005"></a>
     <!--l. 402--><p class="noindent">Sets the join to a miter join. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span>.
     <!--l. 404--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 407--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox429"><span 
class="cmtt-10">\pgfsys@setmiterlimit</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">factor</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315006"></a>
     <!--l. 408--><p class="noindent">Sets the miter limit of lines to <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">factor</span><span 
class="cmsy-10">&gt;</span>. See the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;or PostScript for details on what the miter limit
     is.
     <!--l. 411--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 414--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox430"><span 
class="cmtt-10">\pgfsys@roundjoin</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315007"></a>
     <!--l. 415--><p class="noindent">Sets the join to a round join. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span>.
     <!--l. 417--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 420--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox431"><span 
class="cmtt-10">\pgfsys@beveljoin</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315008"></a>
     <!--l. 421--><p class="noindent">Sets the join to a bevel join. See <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span>.
     <!--l. 423--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 426--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox432"><span 
class="cmtt-10">\pgfsys@setdash</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">pattern</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">phase</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315009"></a>
     <!--l. 427--><p class="noindent">Sets the dashing patter. <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">pattern</span><span 
class="cmsy-10">&gt; </span>should be a list of <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimensions lengths separated by commas.
     <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">phase</span><span 
class="cmsy-10">&gt; </span>should be a single dimension.
     <!--l. 431--><p class="noindent"><span 
class="cmti-10">Example: </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@setdash{3pt,3pt}{0pt}</span></span></span>
     <!--l. 433--><p class="noindent">The list of values in <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">pattern</span><span 
class="cmsy-10">&gt; </span>is used to determine the lengths of the &#8220;on&#8221; phases of the dashing and
     of the &#8220;off&#8221; phases. For example, if <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">pattern</span><span 
class="cmsy-10">&gt; </span>is <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">3bp,4bp</span></span></span>, then the dashing pattern is &#8220;3bp on followed
     by 4bp off, followed by 3bp on, followed by 4bp off, and so on.&#8221; A pattern of <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">.5pt,4pt,3pt,1.5pt</span></span></span>
     means &#8220;.5pt on, 4pt off, 3pt on, 1.5pt off, .5pt on, ...&#8221; If the number of entries is odd, the last one is
     used twice, so <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">3pt</span></span></span> means &#8220;3pt on, 3pt off, 3pt on, 3pt off, ...&#8221; An empty list means &#8220;always on.&#8221;
     <!--l. 443--><p class="noindent">The second argument determines the &#8220;phase&#8221; of the pattern. For example, for a pattern of <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">3bp,4bp</span></span></span>
     and a phase of <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">1bp</span></span></span>, the pattern would start: &#8220;2bp on, 4bp off, 3bp on, 4bp off, 3bp on, 4bp off, ...&#8221;
     <!--l. 448--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
                                                                                         
                                                                                         
<!--l. 452--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox433"><span 
class="cmtt-10">\ifpgfsys@eorule</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315010"></a>
     <!--l. 453--><p class="noindent">Determines whether the even odd rule is used for filling and clipping or not. </dd></dl>
<!--l. 458--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox434"><span 
class="cmtt-10">\pgfsys@stroke@opacity</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">value</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315011"></a>
     <!--l. 459--><p class="noindent">Sets the opacity of stroking operations. </dd></dl>
<!--l. 462--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox435"><span 
class="cmtt-10">\pgfsys@fill@opacity</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">value</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-315012"></a>
     <!--l. 463--><p class="noindent">Sets the opacity of filling operations. </dd></dl>
<!--l. 467--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.6   </span> <a 
 id="x34-31600033.6"></a>Color System Commands</h4>
<!--l. 469--><p class="noindent">The <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>&nbsp;system layer provides a number of system commands for setting colors. These command coexist with
commands from the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">color</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">xcolor</span></span></span> package, which perform similar functions. However, the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">color</span></span></span> package does
not support having two different colors for stroking and filling, which is a useful feature that is supported by <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>.
For this reason, the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>&nbsp;system layer offers commands for setting these colors separatedly. Also, plain <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;profits
from the fact that <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>&nbsp;can set colors.
<!--l. 478--><p class="indent">   For <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>, implementing these color commands is easy since <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;supports different stroking and
filling colors directly. For PostScript, a more complicated approach is needed in which the colors need
to be stored in special PostScript variables that are set whenever a stroking or a filling operation is
done.
<!--l. 484--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox436"><span 
class="cmtt-10">\pgfsys@color@rgb</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">red</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">green</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">blue</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316001"></a>
     <!--l. 485--><p class="noindent">Sets the color used for stroking and filling operations to the given red/green/blue tuple (numbers
     between 0 and 1).
     <!--l. 488--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 491--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox437"><span 
class="cmtt-10">\pgfsys@color@rgb@stroke</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">red</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">green</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">blue</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316002"></a>
     <!--l. 492--><p class="noindent">Sets the color used for stroking operations to the given red/green/blue tuple (numbers between 0 and
     1).
     <!--l. 495--><p class="noindent"><span 
class="cmti-10">Example: </span>Make stroked text dark red: <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@rgb@stroke{0.5}{0}{0}</span></span></span>
     <!--l. 497--><p class="noindent">The special stroking color is only used if the stroking color has been set since the last <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\color</span></span></span> or
     <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@xxx</span></span></span> command. Thus, each <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\color</span></span></span> command will reset both the stroking and filling
     colors by calling <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@reset</span></span></span>.
     <!--l. 502--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 505--><p class="indent">
                                                                                         
                                                                                         
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox438"><span 
class="cmtt-10">\pgfsys@color@rgb@fill</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">red</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">green</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">blue</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316003"></a>
     <!--l. 506--><p class="noindent">Sets the color used for filling operations to the given red/green/blue tuple (numbers between 0 and 1).
     This color may be different from the stroking color.
     <!--l. 510--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 513--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox439"><span 
class="cmtt-10">\pgfsys@color@cmyk</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">cyan</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">magenta</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">yellow</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">black</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316004"></a>
     <!--l. 514--><p class="noindent">Sets the color used for stroking and filling operations to the given cymk tuple (numbers between 0 and
     1).
     <!--l. 517--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 520--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox440"><span 
class="cmtt-10">\pgfsys@color@cmyk@stroke</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">cyan</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">magenta</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">yellow</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">black</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316005"></a>
     <!--l. 521--><p class="noindent">Sets the color used for stroking operations to the given cymk tuple (numbers between 0 and 1).
     <!--l. 524--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 527--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox441"><span 
class="cmtt-10">\pgfsys@color@cmyk@fill</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">cyan</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">magenta</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">yellow</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">black</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316006"></a>
     <!--l. 528--><p class="noindent">Sets the color used for filling operations to the given cymk tuple (numbers between 0 and 1).
     <!--l. 531--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 534--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox442"><span 
class="cmtt-10">\pgfsys@color@cmy</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">cyan</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">magenta</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">yellow</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316007"></a>
     <!--l. 535--><p class="noindent">Sets the color used for stroking and filling operations to the given cym tuple (numbers between 0 and
     1).
     <!--l. 538--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 541--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox443"><span 
class="cmtt-10">\pgfsys@color@cmy@stroke</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">cyan</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">magenta</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">yellow</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316008"></a>
     <!--l. 542--><p class="noindent">Sets the color used for stroking operations to the given cym tuple (numbers between 0 and 1).
     <!--l. 545--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 548--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox444"><span 
class="cmtt-10">\pgfsys@color@cmy@fill</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">cyan</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">magenta</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">yellow</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316009"></a>
     <!--l. 549--><p class="noindent">Sets the color used for filling operations to the given cym tuple (numbers between 0 and 1).
     <!--l. 552--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 555--><p class="indent">
                                                                                         
                                                                                         
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox445"><span 
class="cmtt-10">\pgfsys@color@gray</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">black</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316010"></a>
     <!--l. 556--><p class="noindent">Sets the color used for stroking and filling operations to the given black value, where 0 means black
     and 1 means white.
     <!--l. 559--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 562--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox446"><span 
class="cmtt-10">\pgfsys@color@gray@stroke</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">black</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316011"></a>
     <!--l. 563--><p class="noindent">Sets the color used for stroking operations to the given black value, where 0 means black and 1 means
     white.
     <!--l. 566--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 569--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox447"><span 
class="cmtt-10">\pgfsys@color@gray@fill</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">black</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316012"></a>
     <!--l. 570--><p class="noindent">Sets the color used for filling operations to the given black value, where 0 means black and 1 means
     white.
     <!--l. 573--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 576--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox448"><span 
class="cmtt-10">\pgfsys@color@reset</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316013"></a>
     <!--l. 577--><p class="noindent">This command will be called when the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\color</span></span></span> command is used. It should purge any internal settings of
     stroking and filling color. After this call, till the next use of a command like <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@rgb@fill</span></span></span>,
     the current color installed by the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\color</span></span></span> command should be used.
     <!--l. 583--><p class="noindent">If the <span class="TEX">T<span 
class="E">E</span>X</span>-if <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@reset@inorder</span></span></span> is set to true, this command may &#8220;assume&#8221; that any
     call to a color command that sets the fill or stroke color came &#8220;before&#8221; the call to this command and
     may try to optimize the output accordingly.
     <!--l. 588--><p class="noindent">An example of an incorrect &#8220;out of order&#8221; call would be using <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@reset</span></span></span> at the beginning
     of a box that is constructed using <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\setbox</span></span></span>. Then, when the box is constructed, no special fill or stroke
     color might be in force. However, when the box is later on inserted at some point, a special fill color
     might already have been set. In this case, this command is not guaranteed to reset the color correctly.
     </dd></dl>
<!--l. 597--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox449"><span 
class="cmtt-10">\pgfsys@color@reset@inordertrue</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316014"></a>
     <!--l. 598--><p class="noindent">Sets the optimized &#8220;in order&#8221; version of the color resetting. This is the default. </dd></dl>
<!--l. 602--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox450"><span 
class="cmtt-10">\pgfsys@color@reset@inorderfalse</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316015"></a>
     <!--l. 603--><p class="noindent">Switches off the optimized color resetting. </dd></dl>
<!--l. 606--><p class="indent">
                                                                                         
                                                                                         
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox451"><span 
class="cmtt-10">\pgfsys@color@unstacked</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span class="LATEX"><span 
class="cmti-10">L</span><span class="A"><span 
class="cmti-10">A</span></span><span class="TEX"><span 
class="cmti-10">T</span><span 
class="E"><span 
class="cmti-10">E</span></span><span 
class="cmti-10">X</span></span></span><span 
class="cmti-10">&nbsp;color</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-316016"></a>
     <!--l. 607--><p class="noindent">This slightly obscure command causes the color stack to be tricked. When called, this command should
     set the current color to <span 
class="cmsy-10">&lt;</span><span class="LATEX"><span 
class="cmti-10">L</span><span class="A"><span 
class="cmti-10">A</span></span><span class="TEX"><span 
class="cmti-10">T</span><span 
class="E"><span 
class="cmti-10">E</span></span><span 
class="cmti-10">X</span></span></span><span 
class="cmti-10">&nbsp;color</span><span 
class="cmsy-10">&gt; </span>without causing any change in the color stack.
     <!--l. 611--><p class="noindent"><span 
class="cmti-10">Example: </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@color@unstacked{red}</span></span></span> </dd></dl>
<!--l. 615--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.7   </span> <a 
 id="x34-31700033.7"></a>Scoping System Commands</h4>
<!--l. 617--><p class="noindent">The scoping commands are used to keep changes of the graphics state local.
<!--l. 620--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox452"><span 
class="cmtt-10">\pgfsys@beginscope</span></span> </dt><dd 
class="description">
<a 
 id="dx34-317001"></a>
     <!--l. 621--><p class="noindent">Saves the current graphic state on a graphic state stack. All changes to the graphic state parameters
     mentioned for <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@stroke</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@fill</span></span></span> will be local to the current graphic state and the
     old values will be restored after <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@endscope</span></span></span> is used.
     <!--l. 626--><p class="noindent"><span 
class="cmti-10">Warning: </span><span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;and PostScript differ with respect to the question of whether the current path is part
     of the graphic state or not. For this reason, you should never use this command unless the path is
     currently empty. For example, it might be a good idea to use <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@discardpath</span></span></span> prior to calling
     this command.
     <!--l. 632--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 635--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox453"><span 
class="cmtt-10">\pgfsys@endscope</span></span> </dt><dd 
class="description">
<a 
 id="dx34-317002"></a>
     <!--l. 636--><p class="noindent">Restores the last saved graphic state.
     <!--l. 638--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 647--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.8   </span> <a 
 id="x34-31800033.8"></a>Image System Commands</h4>
<!--l. 649--><p class="noindent">The system layer provides some commands for image inclusion.
<!--l. 651--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox454"><span 
class="cmtt-10">\pgfsys@imagesuffixlist</span></span> </dt><dd 
class="description">
<a 
 id="dx34-318001"></a>
     <!--l. 652--><p class="noindent">This macro should expand to a list of suffixes, separated by &#8216;:&#8217;, that will be tried when searching for
     an image.
     <!--l. 655--><p class="noindent"><span 
class="cmti-10">Example: </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\def\pgfsys@imagesuffixlist{eps:epsi:ps}</span></span></span> </dd></dl>
<!--l. 659--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox455"><span 
class="cmtt-10">\pgfsys@defineimage</span></span> </dt><dd 
class="description">
<a 
 id="dx34-318002"></a>
     <!--l. 660--><p class="noindent">Called, when an image should be defined.
     <!--l. 662--><p class="noindent">This  command  does  not  take  any  parameters.  Instead,  certain  macros  will  be  preinstalled  with
     appropriate values when this command is invoked. These are:
                                                                                         
                                                                                         
         <ul class="itemize1">
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@filename</span></span></span> File name of the image to be defined.
         </li>
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@imagewidth</span></span></span> Will be set to the desired (scaled) width of the image.
         </li>
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@imageheight</span></span></span> Will be set to the desired (scaled) height of the image.
         <!--l. 676--><p class="noindent">If this macro and also the height macro are empty, the image should have its &#8220;natural&#8221; size.
         <!--l. 679--><p class="noindent">If exactly only of them is specified, the undefined value the image is scaled so that the aspect
         ratio is kept.
         <!--l. 682--><p class="noindent">If both are set, the image is scaled in both directions independently, possibly changing the aspect
         ratio.</li></ul>
     <!--l. 686--><p class="noindent">The following macros presumable mostly make sense for drivers that can handle <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>:
         <ul class="itemize1">
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@imagepage</span></span></span> The desired page number to be extracted from a multi-page &#8220;image.&#8221;
         </li>
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@imagemask</span></span></span> If set, it will be set to <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">/SMask</span><span 
class="cmtt-10">&nbsp;x</span><span 
class="cmtt-10">&nbsp;0</span><span 
class="cmtt-10">&nbsp;R</span></span></span> where <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">x</span></span></span> is the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;object number of a
         soft mask to be applied to the image.
         </li>
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@imageinterpolate</span></span></span> If set, it will be set to <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">/Interpolate</span><span 
class="cmtt-10">&nbsp;true</span></span></span> or <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">/Interpolate</span><span 
class="cmtt-10">&nbsp;false</span></span></span>,
         indicating whether the image should be interpolated in <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>.</li></ul>
     <!--l. 704--><p class="noindent">The command should now setup the macro <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@image</span></span></span> such that calling this macro will result in typesetting
     the image. Thus, <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@image</span></span></span> is the &#8220;return value&#8221; of the command.
     <!--l. 708--><p class="noindent">This command has a default implementation and need not be implemented by a driver file. </dd></dl>
<!--l. 713--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox456"><span 
class="cmtt-10">\pgfsys@definemask</span></span> </dt><dd 
class="description">
<a 
 id="dx34-318003"></a>
     <!--l. 714--><p class="noindent">This command declares a mask for usage with images. It works similar to <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@defineimage</span></span></span>:
     Certain macros are set when the command is called. The result should be to set the macro <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@mask</span></span></span>
     to a pdf object count that can subsequently be used as a soft mask. The following macros will be set
     when this command is invoked:
         <ul class="itemize1">
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@filename</span></span></span> File name of the mask to be defined.
         </li>
         <li class="itemize"><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@maskmatte</span></span></span> The so-called matte of the mask (see the <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;documentation for details). The
         matte is a color specification consisting of 1, 3 or 4 numbers between 0 and 1. The number of
         numbers depends on the number of color channels in the image (not in the mask!). It will be
         assumed that the image has been preblended with this color.</li></ul>
     </dd></dl>
<!--l. 734--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.9   </span> <a 
 id="x34-31900033.9"></a>Shading System Commands</h4>
<!--l. 737--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox457"><span 
class="cmtt-10">\pgfsys@horishading</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">height</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">specification</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-319001"></a>
                                                                                         
                                                                                         
     <!--l. 738--><p class="noindent">Declares a horizontal shading for later use. The effect of this command should be the definition of
     a macro called <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\@pgfshading</span></span></span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">!</span></span></span> (or <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\csname</span><span 
class="cmtt-10">&nbsp;@pdfshading</span></span></span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">!\endcsname</span></span></span>, to be precise).
     When invoked, this new macro should insert a shading at the current position.
     <!--l. 744--><p class="noindent"><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt; </span>is the name of the shading, which is also used in the output macro name. <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">height</span><span 
class="cmsy-10">&gt; </span>is the height
     of the shading and must be given as a TeX dimension like <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">2cm</span></span></span> or <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">10pt</span></span></span>. <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">specification</span><span 
class="cmsy-10">&gt; </span>is a shading
     color specification as specified in Section&nbsp;<a 
href="pgfmanualse28.html#x29-28600028">28<!--tex4ht:ref: section-shadings --></a>. The shading specification implicitly fixes the width of the
     shading.
     <!--l. 751--><p class="noindent">When <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\@pgfshading</span></span></span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">!</span></span></span> is invoked, it should insert a box of height <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">height</span><span 
class="cmsy-10">&gt; </span>and the width implicit
     in the shading declaration. </dd></dl>
<!--l. 757--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox458"><span 
class="cmtt-10">\pgfsys@vertshading</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">width</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">specification</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-319002"></a>
     <!--l. 758--><p class="noindent">Like the horizontal version, only for vertical shadings. This time, the height of the shading is implicit
     in <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">specification</span><span 
class="cmsy-10">&gt; </span>and the width is given as <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">width</span><span 
class="cmsy-10">&gt;</span>. </dd></dl>
<!--l. 763--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox459"><span 
class="cmtt-10">\pgfsys@radialshading</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">starting point</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">specification</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-319003"></a>
     <!--l. 764--><p class="noindent">Declares  a  radial  shading.  Like  the  previous  macros,  this  command  should  setup  the  macro
     <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\@pgfshading</span></span></span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">!</span></span></span>, which upon invocation should insert a radial shading whose size is implicit in
     <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">specification</span><span 
class="cmsy-10">&gt;</span>.
     <!--l. 769--><p class="noindent">The parameter <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">starting point</span><span 
class="cmsy-10">&gt; </span>is a <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>&nbsp;point specifying the inner starting point of the shading. </dd></dl>
<!--l. 774--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.10   </span> <a 
 id="x34-32000033.10"></a>Reusable Objects System Commands</h4>
<!--l. 776--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox460"><span 
class="cmtt-10">\pgfsys@invoke</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">literals</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-320001"></a>
     <!--l. 777--><p class="noindent">This command gets protocoled literals and should insert them into the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">.pdf</span></span></span> or <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">.dvi</span></span></span> file using an
     appropriate <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\special</span></span></span>. </dd></dl>
<!--l. 782--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox461"><span 
class="cmtt-10">\pgfsys@defobject</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">lower left</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">upper right</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">code</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-320002"></a>
     <!--l. 783--><p class="noindent">Declares an object for later use. The idea is that the object can be precached in some way and then
     be rendered more quickly when used several times. For example, an arrow head might be defined and
     prerendered in this way.
     <!--l. 788--><p class="noindent">The parameter <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt; </span>is the name for later use. <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">lower left</span><span 
class="cmsy-10">&gt; </span>and <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">upper right</span><span 
class="cmsy-10">&gt; </span>are <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">G</small><small 
class="small-caps">F</small></span>&nbsp;points specifying
     a bounding box for the object. <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">code</span><span 
class="cmsy-10">&gt; </span>is the code for the object. The code should not be too fancy.
     <!--l. 793--><p class="noindent">This command has a default implementation and need not be implemented by a driver file. </dd></dl>
<!--l. 797--><p class="noindent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox462"><span 
class="cmtt-10">\pgfsys@useobject</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">name</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">extra code</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-320003"></a>
     <!--l. 798--><p class="noindent">Renders a previously declared object. The first parameter is the name of the the object. The second
     parameter is extra code that should be executed right <span 
class="cmti-10">before </span>the object is rendered. Typically, this will
     be some transformation code.
     <!--l. 803--><p class="noindent">This command has a default implementation and need not be implemented by a driver file. </dd></dl>
                                                                                         
                                                                                         
<!--l. 808--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.11   </span> <a 
 id="x34-32100033.11"></a>Invisibility System Commands</h4>
<!--l. 810--><p class="noindent">All drawing or stroking or text rendering between calls of the following commands should be suppressed. A similar
effect can be achieved by clipping against an empty region, but the following commands do not open a graphics
scope and can be opened and closed &#8220;orthogonally&#8221; to other scopes.
<!--l. 816--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox463"><span 
class="cmtt-10">\pgfsys@begininvisible</span></span> </dt><dd 
class="description">
<a 
 id="dx34-321001"></a>
     <!--l. 817--><p class="noindent">Between  this  command  and  the  closing  <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgfsys@endinvisible</span></span></span> all  output  should  be  suppressed.
     Nothing should be drawn at all, which includes all paths, images and shadings. However, no groups
     (neither <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;groups nor graphic state groups) should be opened by this command.
     <!--l. 823--><p class="noindent">This command has a default implementation and need not be implemented by a driver file.
     <!--l. 826--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 829--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox464"><span 
class="cmtt-10">\pgfsys@endinvisible</span></span> </dt><dd 
class="description">
<a 
 id="dx34-321002"></a>
     <!--l. 830--><p class="noindent">Ends the invisibility section, unless invisibility blocks have been nested. In this case, only the &#8220;last&#8221;
     one restores visibility.
     <!--l. 833--><p class="noindent">This command has a default implementation and need not be implemented by a driver file.
     <!--l. 836--><p class="noindent">This command is protocoled, see Section&nbsp;<a 
href="pgfmanualse35.html#x36-32800035">35<!--tex4ht:ref: section-protocols --></a>. </dd></dl>
<!--l. 842--><p class="noindent">
   <h4 class="subsectionHead"><span class="titlemark">33.12   </span> <a 
 id="x34-32200033.12"></a>Internal Conversion Commands</h4>
<!--l. 844--><p class="noindent">The system commands take <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimensions as input, but the dimensions that have to be inserted into <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;and
PostScript files need to be dimensionless values that are interpreted as multiples of <img 
src="pgfmanual35x.gif" alt=" 1
72"  class="frac" align="middle">in. For example, the
<span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimension 2<span 
class="cmmi-10">bp </span>should be inserted as <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">2</span></span></span> into a <span 
class="cmcsc-10"><small 
class="small-caps">P</small><small 
class="small-caps">D</small><small 
class="small-caps">F</small></span>&nbsp;file and the <span class="TEX">T<span 
class="E">E</span>X</span>&nbsp;dimension 10pt as <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">9.9626401</span></span></span>. To make
this conversion easier, the following command may be useful:
<!--l. 852--><p class="indent">
     <dl class="description"><dt class="description">
<span 
class="colorbox" id="colorbox465"><span 
class="cmtt-10">\pgf@sys@bp</span><span 
class="cmtt-10">{</span><span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">dimension</span><span 
class="cmsy-10">&gt;</span><span 
class="cmtt-10">}</span></span> </dt><dd 
class="description">
<a 
 id="dx34-322001"></a>
     <!--l. 853--><p class="noindent">Inserts how many multiples of <img 
src="pgfmanual36x.gif" alt="1
72"  class="frac" align="middle">in the <span 
class="cmsy-10">&lt;</span><span 
class="cmti-10">dimension</span><span 
class="cmsy-10">&gt; </span>is into the current protocol stream (buffered).
     <!--l. 856--><p class="noindent"><span 
class="cmti-10">Example: </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@sys@bp{\pgf@x}</span></span></span> or <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">\pgf@sys@bp{1cm}</span></span></span>. </dd></dl>
<!--l. 859--><p class="indent">   Note that this command is <span 
class="cmti-10">not </span>a system command that can/needs to be overwritten by a driver.
                                                                                         
                                                                                         
                                                                                         
                                                                                         
                                                                                         
                                                                                         
   <div class="crosslinks"><p class="noindent">[<a 
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