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%D \module
%D [ file=mp-grph.mpiv,
%D version=2000.12.14,
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=graphic text support,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See licen-en.pdf for
%C details.
%D Under construction.
if known context_grph : endinput ; fi ;
boolean context_grph ; context_grph := true ;
picture _currentpicture_ ;
numeric _fig_nesting_ ; _fig_nesting_ := 0 ;
def beginfig (expr c) =
_fig_nesting_ := _fig_nesting_ + 1 ;
if _fig_nesting_ = 1 :
begingroup
charcode := c ;
resetfig ;
scantokens extra_beginfig ;
fi ;
enddef ;
def endfig =
; % safeguard
if _fig_nesting_ = 1 :
scantokens extra_endfig ;
shipit ;
endgroup ;
fi ;
_fig_nesting_ := _fig_nesting_ - 1 ;
enddef;
def resetfig =
clearxy ;
clearit ;
clearpen ;
pickup defaultpen ;
interim linecap := linecap ;
interim linejoin := linejoin ;
interim miterlimit := miterlimit ;
save _background_ ; color _background_ ; _background_ := background ;
save background ; color background ; background := _background_ ;
drawoptions () ;
enddef ;
def protectgraphicmacros =
save showtext ;
save beginfig ; let beginfig = begingraphictextfig ;
save endfig ; let endfig = endgraphictextfig ;
save end ; let end = relax ;
interim prologues := prologues ;
resetfig ; % resets currentpicture
enddef ;
numeric currentgraphictext ; currentgraphictext := 0 ;
def data_mpo_file = job_name & "-mpgraph.mpo" enddef ;
def data_mpy_file = job_name & "-mpgraph.mpy" enddef ;
def begingraphictextfig (expr n) =
foundpicture := n ;
scratchpicture := nullpicture ;
enddef ;
def endgraphictextfig =
if foundpicture = currentgraphictext :
expandafter endinput
else :
scratchpicture := nullpicture ;
fi ;
enddef ;
def loadfigure primary filename =
doloadfigure (filename)
enddef ;
def doloadfigure (expr filename) text figureattributes =
begingroup ;
save figurenumber, figurepicture, number, fixedplace ;
numeric figurenumber ; figurenumber := 0 ;
boolean figureshift ; figureshift := true ;
picture figurepicture ; figurepicture := currentpicture ;
def number primary n = hide(figurenumber := n) enddef ;
def fixedplace = hide(figureshift := false) enddef ;
protectgraphicmacros ;
% defaults
interim linecap := rounded ;
interim linejoin := rounded ;
interim miterlimit := 10 ;
%
currentpicture := nullpicture ;
draw fullcircle figureattributes ; % expand number
currentpicture := nullpicture ;
def beginfig (expr n) =
currentpicture := nullpicture ;
if (figurenumber=n) or (figurenumber=0) :
let endfig = endinput ;
fi ;
enddef ;
let endfig = relax ;
readfile(filename) ;
if figureshift :
currentpicture := currentpicture shifted -llcorner currentpicture ;
fi ;
addto figurepicture also currentpicture figureattributes ;
currentpicture := figurepicture ;
endgroup ;
enddef ;
def graphictext primary t =
hide (
if mfun_trial_run :
let mfun_graphic_text = mfun_no_graphic_text ;
else :
let mfun_graphic_text = mfun_do_graphic_text ;
fi
)
mfun_graphic_text(t)
enddef ;
def mfun_do_graphic_text (expr t) =
% withprescript "gt_stage=final"
begingroup ;
save figurepicture ; picture figurepicture ;
figurepicture := currentpicture ; currentpicture := nullpicture ;
currentgraphictext := currentgraphictext + 1 ;
mfun_finish_graphic_text % picks up directives
enddef ;
def mfun_no_graphic_text (expr t) text rest =
draw unitsquare withprescript "gt_stage=trial" withpostscript t
enddef ;
def mfun_finish_graphic_text text x_op_x =
protectgraphicmacros ; % resets currentpicture
interim linecap := butt ; % normally rounded
interim linejoin := mitered ; % normally rounded
interim miterlimit := 10 ; % todo
let normalwithshade = withshade ;
save foundpicture, scratchpicture, str ;
save fill, draw, withshade, reversefill, outlinefill ;
save withfillcolor, withdrawcolor ; % quite important
numeric foundpicture ; picture scratchpicture ; string str ;
def draw expr p =
% the first, naive implementation was:
% addto scratchpicture doublepath p withpen currentpen ;
% but it is better to turn lines into fills
addto scratchpicture contour boundingbox
image (addto currentpicture doublepath p withpen currentpen) ;
enddef ;
def fill expr p =
addto scratchpicture contour p withpen currentpen ;
enddef ;
def f_op_f = enddef ; boolean f_color ; f_color := false ;
def d_op_d = enddef ; boolean d_color ; d_color := false ;
def s_op_s = enddef ; boolean s_color ; s_color := false ;
boolean reverse_fill ; reverse_fill := false ;
boolean outline_fill ; outline_fill := false ;
def reversefill =
hide(reverse_fill := true )
enddef ;
def outlinefill =
hide(outline_fill := true )
enddef ;
def withshade primary c =
hide(def s_op_s = normalwithshade c enddef ; s_color := true )
enddef ;
def withfillcolor primary c =
hide(def f_op_f = withcolor c enddef ; f_color := true )
enddef ;
def withdrawcolor primary c =
hide(def d_op_d = withcolor c enddef ; d_color := true )
enddef ;
scratchpicture := nullpicture ;
addto scratchpicture doublepath origin x_op_x ; % pre-roll
for i within scratchpicture : % Below here is a dirty tricky test!
if (urcorner dashpart i) = origin :
outline_fill := false ;
fi ;
endfor ;
scratchpicture := nullpicture ;
readfile(data_mpy_file) ;
scratchpicture := (scratchpicture shifted -llcorner scratchpicture) scaled (1/10) ;
if not d_color and not f_color :
d_color := true ;
fi
if s_color :
d_color := false ;
f_color := false ;
fi ;
currentpicture := figurepicture ;
if d_color and not reverse_fill :
for i within scratchpicture :
if f_color and outline_fill :
addto currentpicture doublepath pathpart i _op_ x_op_x f_op_f dashed nullpicture ;
fi ;
if filled i :
addto currentpicture doublepath pathpart i _op_ x_op_x d_op_d ;
fi ;
endfor ;
fi ;
if f_color :
for i within scratchpicture :
if filled i :
addto currentpicture contour pathpart i _op_ x_op_x f_op_f withpen pencircle scaled 0 ;
fi ;
endfor ;
fi ;
if d_color and reverse_fill :
for i within scratchpicture :
if filled i :
addto currentpicture doublepath pathpart i _op_ x_op_x d_op_d ;
fi ;
endfor ;
fi ;
if s_color :
for i within scratchpicture :
if filled i :
addto currentpicture contour pathpart i _op_ x_op_x s_op_s ;
fi ;
endfor ;
else :
for i within scratchpicture :
if stroked i :
addto currentpicture doublepath pathpart i _op_ x_op_x d_op_d ;
fi ;
endfor ;
fi ;
endgroup ;
enddef ;
% example
%
% beginfig (1) ;
% graphictext
% "\vbox{\hsize10cm \input tufte }"
% scaled 8
% withdrawcolor blue
% withfillcolor red
% withpen pencircle scaled 2pt ;
% endfig ;
%
% beginfig(1) ;
% loadfigure "gracht.mp" rotated 20 ;
% loadfigure "koe.mp" number 1 scaled 2 ;
% endfig ;
%
% end
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