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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \inspic {Graphics <2020-02-29>}
\_doc -----------------------------
`\inspic` accepts old syntax `\inspic <filename><space>`
or new syntax `\inspic{<filename>}`. So, we need to define
two auxiliary macros `\_inspicA` and `\_inspicB`.
You can include more `\pdfximage` parameters (like `page=`)
in the `\_picparams` macro.
All `\inspic` macros are surrounded in `\hbox` in order user can
write `\moveright\inspic ...` or something similar.
\_cod \_fin -----------------------
\_def\_inspic{\hbox\bgroup\_isnextchar\_bgroup\_inspicB\_inspicA}
\_def\_inspicA #1 {\_inspicB {#1}}
\_def\_inspicB #1{%
\_pdfximage \_ifdim\_picwidth=0pt \_else width\_picwidth\_fi
\_ifdim\_picheight=0pt \_else height\_picheight\_fi
\_picparams {\_the\_picdir#1}%
\_pdfrefximage\_pdflastximage\egroup}
\_def\_picparams{}
\_public \inspic ;
\_doc ----------------------------
`\pdfscale` and `\pdfrotate` macros are implemented by `\pdfsetmatrix`
primitive. or rotating we need to knos values of sin, cos function.
We use Lua code for this.
\_cod ----------------------------
\_def\_pdfscale#1#2{\_pdfsetmatrix{#1 0 0 #2}}
\_def\_gonfunc#1#2{%
\_directlua{tex.print(string.format('\_pcent.4f',math.#1(3.14159265*(#2)/180)))}%
}
\_def\_sin{\_gonfunc{sin}}
\_def\_cos{\_gonfunc{cos}}
\_def\_pdfrotate#1{\_pdfsetmatrix{\_cos{#1} \_sin{#1} \_sin{(#1)-180} \_cos{#1}}}
\_public \pdfscale \pdfrotate ;
\_endcode % -------------------------------------
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