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%--------------------------------------------
% $Header: /cvsroot/pgfplots/pgfplots/generic/pgfplots/libs/pgflibrarysurfshading.code.tex,v 1.18 2009/06/26 17:56:58 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/>.
%
%--------------------------------------------
%--------------------------------------------------
% \pgfqkeys{/pgfplots/surf shading}{
% cols=3,
% % test colormap 1,
% }
% \pgfplotslibrarysurfstreamstart
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{0pt}{10pt}}{0}
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{100pt}{10pt}}{100}
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{180pt}{10pt}}{30}
% %
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{0pt}{100pt}}{300}
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{110pt}{90pt}}{1000}
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{190pt}{110pt}}{600}
% %
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{0pt}{200pt}}{0}
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{110pt}{200pt}}{100}
% \pgfplotslibrarysurfstreamcoord{\pgfqpoint{190pt}{200pt}}{60}
% \pgfplotslibrarysurfstreamend
% \fbox{%
% \pgfplotslibrarysurfdraw
% }%
%--------------------------------------------------
\pgfkeys{%
% the extends need to provided as \pgfpoint... The boundary box
% won't be computed manually!
/pgfplots/surf shading/south west corner/.initial={\pgfpointorigin},%
/pgfplots/surf shading/north east corner/.initial={\pgfqpoint{6cm}{6cm}},%
/pgfplots/surf shading/anchor/.initial=\pgfpointorigin,%
/pgfplots/surf shading/precision/.is choice,
/pgfplots/surf shading/precision/pdf/.code={%
% Lossless coordinate output.
\def\pgfplotslibrarysurf@bitspercoordinate{32}%
\def\pgfplotslibrarysurf@bytespercoordinate{4}%
\def\pgfplotslibrarysurf@filter@encode{}% raw binary.
\def\pgfplotslibrarysurf@filter@decode{}%
},%
/pgfplots/surf shading/precision/ps/.code={%
% quantized coordinate output (introduces quantization error).
\def\pgfplotslibrarysurf@bitspercoordinate{24}%
\def\pgfplotslibrarysurf@bytespercoordinate{3}%
% doesn't improve behavior of pdf2ps:
%\def\pgfplotslibrarysurf@filter@encode{ASCIIHexEncode}%
%\def\pgfplotslibrarysurf@filter@decode{ASCIIHexDecode}%
\def\pgfplotslibrarysurf@filter@encode{}% raw binary.
\def\pgfplotslibrarysurf@filter@decode{}%
},%
/pgfplots/surf shading/precision/postscript/.style={%
/pgfplots/surf shading/precision/ps},%
/pgfplots/surf shading/precision/ps,%
/pgfplots/surf shading/cols/.initial=,%
/pgfplots/surf shading/colormap/.initial={%
<<
/FunctionType 2
/Domain [0 1]
/C0 [0 0 1] /C1 [1 0 0] /N 1
>>
},%
/pgfplots/surf shading/test colormap 1/.style={%
/pgfplots/surf shading/colormap={
<<
/FunctionType 3
/Domain [0 1]
/Functions [
<<
/FunctionType 2
/Domain [0 1]
/C0 [0 0 1] /C1 [1 1 0] /N 1
>>
<<
/FunctionType 2
/Domain [0 1]
/C0 [1 1 0] /C1 [1 0.5 0] /N 1
>>
<<
/FunctionType 2
/Domain [0 1]
/C0 [1 0.5 0] /C1 [1 0 0] /N 1
>>
]
/Bounds [ 0.3 0.6 ]
/Encode [0 1 0 1 0 1]
%/Range [0 1 0 1 0 1] INCOMPATIBLE WITH ACROBAT 6.0
>>
}%
},%
}%
\def\pgfplotslibrarysurf@corner@sw{\pgfkeysvalueof{/pgfplots/surf shading/south west corner}}
\def\pgfplotslibrarysurf@corner@ne{\pgfkeysvalueof{/pgfplots/surf shading/north east corner}}%
\def\pgfplotslibrarysurf@decode{%
-16383.999992 16384 % see the docs of \pgfplotsbinaryencodedimenmaplinearly
-16383.999992 16384 %
0 \pgfplotscolormappdfmax % map [0,2^BitsPerComponent-1] linearly to [0 1] for parametric color data
}%
\def\pgfplotslibrarysurf@count{0}%
% driver specific:
\def\pgfplotslibrarysurf@initstream{}
\def\pgfplotslibrarysurf@advancestreamlen#1{}%
\def\pgfplotslibrarysurfstreamstart{%
\pgfplotsapplistXnewempty\pgfplotslibrarysurf@binarystream@accum
\pgfplotslibrarysurf@initstream
\ifx\pgfplotslibrarysurf@filter@encode\pgfutil@empty
\else
\pgfkeysalso{/pgfplots/bin/\pgfplotslibrarysurf@filter@encode}%
\fi
}%
\def\pgfplotslibrarysurfstreamend{%
\pgfplotsapplistXlet\pgfplotslibrarysurf@binarystream=\pgfplotslibrarysurf@binarystream@accum
}%
% #1: a pgf point.
% #2: a color coordinate in the range [0,1000]
\def\pgfplotslibrarysurfstreamcoord#1#2{%
\pgfplotsbinarysetbytes\pgfplotslibrarysurf@bytespercoordinate%
\pgf@process{#1}%
% The idea is to map
% the low-level point coordinates LINEARLY into [0,2^{8*<bytes>}].
%
% This is what the pdf standard expects for surface shadings.
%
% To do that, we simply map
% [-16384,16384] linearly into [0,2^{32}]
% and write the resulting integer in big endian binary format to
% the pdf low level stream.
%
% The decode procedure tells the pdf viewer how to invert that
% stuff.
%
\pgf@sys@bp@correct\pgf@x%
\pgfplotsbinaryencodedimenmaplinearly\pgf@x
%\message{POINT \the\c@pgfplots@scanlineindex: ENCODING(x=\the\pgf@x)=\pgfplotsbinaryresult.}\advance\c@pgfplots@scanlineindex by1
\t@pgfplots@toka=\expandafter{\pgfplotsbinaryresult}%
\pgf@sys@bp@correct\pgf@y%
\pgfplotsbinaryencodedimenmaplinearly\pgf@y
%\message{ENCODING(y=\the\pgf@y)=\pgfplotsbinaryresult.}%
\t@pgfplots@tokb=\expandafter{\pgfplotsbinaryresult}%
{%
% read fixed point input (in the range [0,1000]).
\pgf@xa=#2pt
% convert to integer (= *65536):
\c@pgf@counta=\pgf@xa
% provide map [0,1000] -> [0,2^16-1]
\divide\c@pgf@counta by1000
% now, we have \c@pgf@counta in [0,2^16]. Simply strip it into
% the required range, that's ok.
\ifnum\c@pgf@counta<0
\c@pgf@counta=0
\else
\ifnum\c@pgf@counta>65535
\c@pgf@counta=65535
\fi
\fi
% Now, we have CDATA in the range [0,65535]
\xdef\pgfplots@glob@TMPa{\the\c@pgf@counta}%
%\message{ENCODING(C=\pgfplots@glob@TMPa\space for \the\pgf@xa)=}%
}%
\pgfplotsbinarysetbytes2%
\pgfplotsbinaryencodeunsigned\pgfplots@glob@TMPa
%\message{\pgfplotsbinaryresult.}%
\t@pgfplots@tokc=\expandafter{\pgfplotsbinaryresult}%
\edef\pgfplots@loc@TMPa{\the\t@pgfplots@toka\the\t@pgfplots@tokb\the\t@pgfplots@tokc}%
\expandafter\pgfplotsapplistXpushback\pgfplots@loc@TMPa\to\pgfplotslibrarysurf@binarystream@accum
\pgfplotslibrarysurf@advancestreamlen{10}%
}
\def\pgfplotslibrarysurfactivateshadefill{%
\pgfplotssys@do@surfshading@fillpaths\pgfplots@loc@TMPa%
\expandafter\pgfutil@addpdfresource@patterns\expandafter{\pgfplots@loc@TMPa}%%
}
%--------------------------------------------------
% \def\pgfplotslibrarysurfdraw{%
% % \pgftext[at=\pgfqpoint{0pt}{0pt}]%
% {\pgfplotssys@do@surfshading}%
% }%
%--------------------------------------------------
\def\pgfplotslibrarysurfdrawinpicture{%
\begingroup
\pgftransformshift{\pgfplotslibrarysurf@corner@sw}%
\pgftext[at=\pgfqpoint{0pt}{0pt},left,bottom] {%
\pgfplotslibrarysurfdraw
% this does NOT work because I can't undo the box' shift:
%\pgfplotssys@do@surfshading
}%
\endgroup
}
\pgfplotsiffileexists{pgflibrarypgfplots.surfshading.\pgfsysdriver}{%
\input pgflibrarypgfplots.surfshading.\pgfsysdriver\relax
\def\pgflibrarysurfshadingifactive#1#2{#1}%
}{%
\def\pgfplotslibrarysurfdraw{%
\pgfplots@error{Sorry, surfshading (shader=interp) is NOT available for the selected driver `\pgfsysdriver'.}%
}%
\def\pgflibrarysurfshadingifactive#1#2{#2}%
}
\endinput
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