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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
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