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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<head><title>33 Commands of the System Layer</title>
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href="pgfmanualse34.html" >next</a>] [<a
href="pgfmanualse32.html" >prev</a>] [<a
href="pgfmanualse32.html#tailpgfmanualse32.html" >prev-tail</a>] [<a
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<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 “user” 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> 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’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"> 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 “setup things.”
<!--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"><</span><span
class="cmti-10">box</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">box</span><span
class="cmsy-10">></span>. This
command should insert the box into the normal text. The box <span
class="cmsy-10"><</span><span
class="cmti-10">box</span><span
class="cmsy-10">> </span>will still be a “raw” box that
contains only the <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">\special</span></span></span>’s that make up the description of the picture. The job of this command is
to resize and shift <span
class="cmsy-10"><</span><span
class="cmti-10">box</span><span
class="cmsy-10">> </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 “pure” <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 “escape” 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"><</span><span
class="cmti-10">box number</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">box number</span><span
class="cmsy-10">></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 “TeX-translation” for the translation
part of the transformation matrix. This will ensure that hyperlinks “survive” 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"><</span><span
class="cmti-10">x</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">y</span><span
class="cmsy-10">></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 “interrupted”).
<!--l. 110--><p class="noindent">Both <span
class="cmsy-10"><</span><span
class="cmti-10">x</span><span
class="cmsy-10">> </span>and <span
class="cmsy-10"><</span><span
class="cmti-10">y</span><span
class="cmsy-10">> </span>are given as <span class="TEX">T<span
class="E">E</span>X</span> dimensions. It is the driver’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> 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 <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"><</span><span
class="cmti-10">x</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">y</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmmi-10">x</span><sub ><span
class="cmr-7">1</span></sub><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmmi-10">y</span><sub ><span
class="cmr-7">1</span></sub><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmmi-10">x</span><sub ><span
class="cmr-7">2</span></sub><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmmi-10">y</span><sub ><span
class="cmr-7">2</span></sub><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmmi-10">x</span><sub ><span
class="cmr-7">3</span></sub><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmmi-10">y</span><sub ><span
class="cmr-7">3</span></sub><span
class="cmsy-10">></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 Bézier 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 <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"><</span><span
class="cmti-10">x</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">y</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">width</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">height</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">width</span><span
class="cmsy-10">> </span>and <span
class="cmsy-10"><</span><span
class="cmti-10">height</span><span
class="cmsy-10">></span>.
<!--l. 156--><p class="noindent">This command can be “mapped back” 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> has a special, quick version of this command.
<!--l. 160--><p class="noindent">This command is protocoled, see Section <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 <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"><</span><span
class="cmti-10">a</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">b</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">c</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">d</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">e</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">f </span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">a</span><span
class="cmsy-10">></span>
to <span
class="cmsy-10"><</span><span
class="cmti-10">f </span><span
class="cmsy-10">></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> or PostScript manual for details. The values <span
class="cmsy-10"><</span><span
class="cmti-10">a</span><span
class="cmsy-10">> </span>to <span
class="cmsy-10"><</span><span
class="cmti-10">d</span><span
class="cmsy-10">> </span>are dimensionless factors,
<span
class="cmsy-10"><</span><span
class="cmti-10">e</span><span
class="cmsy-10">> </span>and <span
class="cmsy-10"><</span><span
class="cmti-10">f </span><span
class="cmsy-10">> </span>are <span class="TEX">T<span
class="E">E</span>X</span> 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 <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"><</span><span
class="cmti-10">x displacement</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">y displacement</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">x scale</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">y scale</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">x scale</span><span
class="cmsy-10">> </span>in the
<span
class="cmmi-10">x</span>-direction and <span
class="cmsy-10"><</span><span
class="cmti-10">y scale</span><span
class="cmsy-10">> </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 <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 “thickness” 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> 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> 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 <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 <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> 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 <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 <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 “throw away” 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 <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"><</span><span
class="cmti-10">width</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">width</span><span
class="cmsy-10">></span>, which must be a <span class="TEX">T<span
class="E">E</span>X</span> dimension.
<!--l. 380--><p class="noindent">This command is protocoled, see Section <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 <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 <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 <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 <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"><</span><span
class="cmti-10">factor</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">factor</span><span
class="cmsy-10">></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> or PostScript for details on what the miter limit
is.
<!--l. 411--><p class="noindent">This command is protocoled, see Section <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 <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 <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"><</span><span
class="cmti-10">pattern</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">phase</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">pattern</span><span
class="cmsy-10">> </span>should be a list of <span class="TEX">T<span
class="E">E</span>X</span> dimensions lengths separated by commas.
<span
class="cmsy-10"><</span><span
class="cmti-10">phase</span><span
class="cmsy-10">> </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"><</span><span
class="cmti-10">pattern</span><span
class="cmsy-10">> </span>is used to determine the lengths of the “on” phases of the dashing and
of the “off” phases. For example, if <span
class="cmsy-10"><</span><span
class="cmti-10">pattern</span><span
class="cmsy-10">> </span>is <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">3bp,4bp</span></span></span>, then the dashing pattern is “3bp on followed
by 4bp off, followed by 3bp on, followed by 4bp off, and so on.” A pattern of <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">.5pt,4pt,3pt,1.5pt</span></span></span>
means “.5pt on, 4pt off, 3pt on, 1.5pt off, .5pt on, ...” 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 “3pt on, 3pt off, 3pt on, 3pt off, ...” An empty list means “always on.”
<!--l. 443--><p class="noindent">The second argument determines the “phase” 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: “2bp on, 4bp off, 3bp on, 4bp off, 3bp on, 4bp off, ...”
<!--l. 448--><p class="noindent">This command is protocoled, see Section <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"><</span><span
class="cmti-10">value</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">value</span><span
class="cmsy-10">></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> 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> system layer offers commands for setting these colors separatedly. Also, plain <span class="TEX">T<span
class="E">E</span>X</span> 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> 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> 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"><</span><span
class="cmti-10">red</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">green</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">blue</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">red</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">green</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">blue</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">red</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">green</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">blue</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">cyan</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">magenta</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">yellow</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">black</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">cyan</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">magenta</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">yellow</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">black</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">cyan</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">magenta</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">yellow</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">black</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">cyan</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">magenta</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">yellow</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">cyan</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">magenta</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">yellow</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">cyan</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">magenta</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">yellow</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">black</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">black</span><span
class="cmsy-10">></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 <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"><</span><span
class="cmti-10">black</span><span
class="cmsy-10">></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 <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 “assume” that any
call to a color command that sets the fill or stroke color came “before” the call to this command and
may try to optimize the output accordingly.
<!--l. 588--><p class="noindent">An example of an incorrect “out of order” 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 “in order” 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"><</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"> color</span><span
class="cmsy-10">></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"><</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"> color</span><span
class="cmsy-10">> </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> 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 <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 <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 ‘:’, 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 “natural” 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 “image.”
</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"> x</span><span
class="cmtt-10"> 0</span><span
class="cmtt-10"> 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> 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"> true</span></span></span> or <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">/Interpolate</span><span
class="cmtt-10"> 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 “return value” 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> 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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">height</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">specification</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></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"> @pdfshading</span></span></span><span
class="cmsy-10"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">> </span>is the name of the shading, which is also used in the output macro name. <span
class="cmsy-10"><</span><span
class="cmti-10">height</span><span
class="cmsy-10">> </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"><</span><span
class="cmti-10">specification</span><span
class="cmsy-10">> </span>is a shading
color specification as specified in Section <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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">height</span><span
class="cmsy-10">> </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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">width</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">specification</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">specification</span><span
class="cmsy-10">> </span>and the width is given as <span
class="cmsy-10"><</span><span
class="cmti-10">width</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">starting point</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">specification</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">specification</span><span
class="cmsy-10">></span>.
<!--l. 769--><p class="noindent">The parameter <span
class="cmsy-10"><</span><span
class="cmti-10">starting point</span><span
class="cmsy-10">> </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> 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"><</span><span
class="cmti-10">literals</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">lower left</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">upper right</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">code</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">> </span>is the name for later use. <span
class="cmsy-10"><</span><span
class="cmti-10">lower left</span><span
class="cmsy-10">> </span>and <span
class="cmsy-10"><</span><span
class="cmti-10">upper right</span><span
class="cmsy-10">> </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> points specifying
a bounding box for the object. <span
class="cmsy-10"><</span><span
class="cmti-10">code</span><span
class="cmsy-10">> </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"><</span><span
class="cmti-10">name</span><span
class="cmsy-10">></span><span
class="cmtt-10">}{</span><span
class="cmsy-10"><</span><span
class="cmti-10">extra code</span><span
class="cmsy-10">></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 “orthogonally” 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> 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 <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 “last”
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 <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> 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> 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> 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> file and the <span class="TEX">T<span
class="E">E</span>X</span> 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"><</span><span
class="cmti-10">dimension</span><span
class="cmsy-10">></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"><</span><span
class="cmti-10">dimension</span><span
class="cmsy-10">> </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.
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