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+%--------------------------------------------
+% $Header: /cvsroot/pgfplots/pgfplots/generic/pgfplots/sys/pgflibrarysurfshading.pgfsys-pdftex.def,v 1.1 2009/06/11 07:14:52 ludewich Exp $
+%
+% Package pgfplots
+%
+% Provides a user-friendly interface to create function plots (normal
+% plots, semi-logplots and double-logplots).
+%
+% It is based on Till Tantau's PGF package.
+%
+% Copyright 2007/2008 by Christian Feuersänger.
+%
+% This program is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 3 of the License, or
+% (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program. If not, see <http://www.gnu.org/licenses/>.
+%
+%--------------------------------------------
+
+
+% The lowlevel call for surface shadings. It uses a pattern type 2
+% dictionary as fill color and has thus several things to do. This is
+% a little bit more complicated than using the '/sh' operator (as
+% other pgf shadings do): the surface shading must be positioned
+% exactly at the requested coordinates, otherwise it is quite useless.
+%
+% Since shadings are *not* affected by changes in the canvas
+% transformation matrix (shifts, rotations etc), it is necessary to
+% pack the shading into a separate xform object which is then rotated
+% and translated correctly.
+%
+% There is just one more transformation necessary: the shift inside of
+% the xform. This shift is done using changes in the canvas
+% transformation matrix and it is UNDONE in the /Matrix argument of
+% the pattern dictionary. This last step can't be done with the /sh
+% operator which is why I am using pattern dictionaries.
+\def\pgfplotslibrarysurfdraw{%
+ \begingroup
+ \setbox\pgfutil@tempboxa=\hbox{%
+ \pgfpicture
+ \pgfplotssys@do@surfshading@fillpaths\pgfplots@loc@TMPa%
+ \global\let\pgfplots@glob@TMPa=\pgfplots@loc@TMPa
+ \pgfpathrectanglecorners
+ {\pgfplotslibrarysurf@corner@sw}
+ {\pgfplotslibrarysurf@corner@ne}%
+ \pgfusepath{fill}%
+ \endpgfpicture
+ }%
+ \pdfxform resources{
+ /Pattern << \pgfplots@glob@TMPa >> % write the pattern resource dictionary
+ }\pgfutil@tempboxa
+ \leavevmode
+ \pdfrefxform\pdflastxform
+ \endgroup
+}
+
+% To be used inside of a pgfpicture.
+%
+% #1: a macro name. The contents of this macro needs to be written
+% into the pdf pattern dictionary contained in the pdf resources of
+% the current context. The current context is either the current page
+% or an xform object.
+%
+%
+\def\pgfplotssys@do@surfshading@fillpaths#1{%
+ \immediate\pdfobj stream attr {%
+ % stream length will be computed automatically
+ /ShadingType 5
+ /BitsPerCoordinate \pgfplotslibrarysurf@bitspercoordinate\space
+ /BitsPerComponent 16
+ /VerticesPerRow \pgfkeysvalueof{/pgfplots/surf shading/cols}
+ /ColorSpace /DeviceRGB
+ /Decode [\pgfplotslibrarysurf@decode]
+ /Function \pgfkeysvalueof{/pgfplots/surf shading/colormap}
+ \ifx\pgfplotslibrarysurf@filter@decode\pgfutil@empty
+ \else
+ /Filter /\pgfplotslibrarysurf@filter@decode\space
+ \fi
+ } {%
+ \pgfplotslibrarysurf@binarystream
+ }%
+ \edef\pgfplots@loc@TMPa{\the\pdflastobj}%
+ \pgf@process{\pgfpointdiff{\pgfplotslibrarysurf@corner@sw}{\pgfkeysvalueof{/pgfplots/surf shading/anchor}}}%
+ \pgf@sys@bp@correct\pgf@x%
+ \pgf@sys@bp@correct\pgf@y%
+ \immediate\pdfobj {<<
+ /Type /Pattern
+ /PatternType 2
+% /Matrix [\pgf@pt@aa\space\pgf@pt@ab\space\pgf@pt@ba\space\pgf@pt@bb\space\pgf@sys@tonumber\pgf@pt@x\space\pgf@sys@tonumber\pgf@pt@y]
+ % FIXME: INCORPORATE TIKZ CM
+ /Matrix [1 0 0 1 \pgf@sys@tonumber\pgf@x\space \pgf@sys@tonumber\pgf@y] %226.533 518.141]
+ %--------------------------------------------------
+ % /ExtGState
+ % <<
+ % /LW 2
+ % /OP true
+ % /OPM 1
+ % >>
+ %--------------------------------------------------
+ /Shading \pgfplots@loc@TMPa\space 0 R
+ >>}%
+ \edef#1{%
+ /pgfpatPlotsurface\pgfplotslibrarysurf@count\space \the\pdflastobj\space 0 R
+ }%
+ \pgfsys@setpatterncolored{Plotsurface\pgfplotslibrarysurf@count}%
+ \pgfplotsutil@advancestringcounter@global\pgfplotslibrarysurf@count
+}
+
+\endinput
+% vi: ft=tex