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%--------------------------------------------
% $Header: /cvsroot/pgfplots/pgfplots/generic/pgfplots/sys/pgflibrarysurfshading.pgfsys-dvips.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/>.
%
%--------------------------------------------
\def\pgfplotslibrarysurf@initstream{%
\if\pgfplotslibrarysurf@bytespercoordinate4%
\pgfplots@warning{************** The generated postscript file may not be compatible with all viewers. Consider using \string\pgfplotsset{surf shading/precision=postscript} for improved compatibility. Or: convert it to pdf, that will work correctly. **************}%
\fi
% binary doesn't work due to limitations of DVI.
% We NEED an ASCII encoding.
%
\def\pgfplotslibrarysurf@filter@encode{ASCIIHexEncode}%
\def\pgfplotslibrarysurf@filter@decode{ASCIIHexDecode}%
}%
% The lowlevel call for surface shadings. It uses a pattern type 2
% dictionary as fill color and has thus several things to do.
%
% It appears the dvips implementation is simpler than the pdftex
% implementation - I did not need to adjust the matrix (don't know
% why).
\def\pgfplotslibrarysurfdraw{%
\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
\leavevmode% ??
}
% 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{%
%http://www.ghostscript.com/pipermail/gs-devel/2002-September/005763.html
%http://www.tek-tips.com/viewthread.cfm?qid=1183719&page=4
% \pgf@process{\pgfpointdiff{\pgfplotslibrarysurf@corner@sw}{\pgfkeysvalueof{/pgfplots/surf shading/anchor}}}%
% \pgf@sys@bp@correct\pgf@x%
% \pgf@sys@bp@correct\pgf@y%
\pgfsys@invoke{%
<<
%/Type /Pattern
/PatternType 2
/Shading
<<
/ShadingType 5
/BitsPerCoordinate \pgfplotslibrarysurf@bitspercoordinate\space
/BitsPerComponent 16 % Note: this here is the reason why I can't use ASCII85Decode
/VerticesPerRow \pgfkeysvalueof{/pgfplots/surf shading/cols}
/ColorSpace /DeviceRGB
/Decode [\pgfplotslibrarysurf@decode]
/Function \pgfkeysvalueof{/pgfplots/surf shading/colormap}
/DataSource
currentfile
% direct binary output not possible: DVI
% doesn't support it (?)
%<< /EODCount \pgfplotslibrarysurf@binarystream@len\space /EODString () >> /SubFileDecode filter
% not completely implemented :
%/ASCII85Decode filter
% works:
/ASCIIHexDecode filter
/ReusableStreamDecode filter
\pgfplotslibrarysurf@binarystream
%\csname pgfp@bin@126\endcsname% tilde ~> is end-of-input indicator for ASCII85Decode
> % end-of-input indicator for ASCIIHexDecode
>>
>> [ 1 0 0 1 0 0 ] makepattern setpattern
% I don't know why I don't need the shifts here !? But it
% appears to work, so never mind.
% >> [ 1 0 0 1 \pgf@sys@tonumber\pgf@x\space \pgf@sys@tonumber\pgf@y ] makepattern setpattern
% 'setpattern' is a shortcut for changing the colorspace and
% the color to pattern.
}%
}
\endinput
% vi: ft=tex
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