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1%D \module
2%D   [       file=mp-grph.mpiv,
3%D        version=2000.12.14,
4%D          title=\CONTEXT\ \METAPOST\ graphics,
5%D       subtitle=graphic text support,
6%D         author=Hans Hagen,
7%D           date=\currentdate,
8%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
9%C
10%C This module is part of the \CONTEXT\ macro||package and is
11%C therefore copyrighted by \PRAGMA. See licen-en.pdf for
12%C details.
13
14%D Under construction.
15
16if known metafun_loaded_grph : endinput ; fi ;
17
18newinternal boolean metafun_loaded_grph ; metafun_loaded_grph := true ; immutable metafun_loaded_grph ;
19
20numeric mfun_fig_nesting ; mfun_fig_nesting := 0 ;
21
22def beginfig (expr c) =
23    mfun_fig_nesting := mfun_fig_nesting + 1 ;
24    if mfun_fig_nesting = 1 :
25        begingroup
26        charcode := c ;
27        resetfig ;
28        scantokens extra_beginfig ;
29    fi ;
30enddef ;
31
32def endfig =
33    ; % safeguard
34    if mfun_fig_nesting = 1 :
35        scantokens extra_endfig ;
36        shipit ;
37        endgroup ;
38    fi ;
39    mfun_fig_nesting := mfun_fig_nesting - 1 ;
40enddef;
41
42def resetfig =
43    clearxy ;
44    clearit ;
45    clearpen ;
46    pickup defaultpen ;
47    interim linecap := linecap ;
48    interim linejoin := linejoin ;
49    interim miterlimit := miterlimit ;
50    interim stacking := 0 ;
51    interim makingfigure := true;
52    save temp_b ; color temp_b ; temp_b := background ;
53    save background ; color background ; background := temp_b ;
54    drawoptions () ;
55enddef ;
56
57permanent beginfig, endfig, resetfig ;
58
59def protectgraphicmacros =
60    save showtext ;
61    save beginfig ; let beginfig = begingraphictextfig ;
62    save endfig   ; let endfig   = endgraphictextfig ;
63    save end      ; let end      = relax ;
64    resetfig ; % resets currentpicture
65enddef ;
66
67numeric currentgraphictext ; currentgraphictext := 0 ;
68
69def begingraphictextfig (expr n) =
70    foundpicture := n ;
71    scratchpicture := nullpicture ;
72enddef ;
73
74def endgraphictextfig =
75    if foundpicture = currentgraphictext :
76        expandafter endinput
77    else :
78        scratchpicture := nullpicture ;
79    fi ;
80enddef ;
81
82def loadfigure primary filename =
83    mfun_load_figure(filename)
84enddef ;
85
86def mfun_load_figure (expr filename) text figureattributes =
87    mutable beginfig, endfig ;
88    begingroup ;
89    save figurenumber, figurepicture, number, fixedplace ;
90    numeric figurenumber  ; figurenumber := 0 ;
91    boolean figureshift ; figureshift := true ;
92    picture figurepicture ; figurepicture := currentpicture ;
93    def number primary n = hide(figurenumber := n) enddef ;
94    def fixedplace = hide(figureshift := false) enddef ;
95    protectgraphicmacros ;
96    % defaults
97    interim linecap    := rounded ;
98    interim linejoin   := rounded ;
99    interim miterlimit := 10 ;
100    %
101    currentpicture := nullpicture ;
102    draw fullcircle figureattributes ; % expand number
103    currentpicture := nullpicture ;
104    def beginfig (expr n) =
105        currentpicture := nullpicture ;
106        if (figurenumber=n) or (figurenumber=0) :
107            let endfig = endinput ;
108        fi ;
109    enddef ;
110    let endfig = relax ;
111    readfile(filename) ;
112    if figureshift :
113        currentpicture := currentpicture shifted -llcorner currentpicture ;
114    fi ;
115    addto figurepicture also currentpicture figureattributes ;
116    currentpicture := figurepicture  ;
117    endgroup ;
118    permanent beginfig, endfig ;
119enddef ;
120
121% We only use the new method now.
122
123boolean mfun_gt_color_fill ;
124boolean mfun_gt_color_draw ;
125boolean mfun_gt_shade_fill ;
126boolean mfun_gt_reverse_fill ;
127boolean mfun_gt_outline_fill ;
128picture mfun_gt_picture ;
129
130def mfun_gt_default = % somewhat compatible
131    scaled 11.5
132    withpen pencircle scaled .1
133enddef ;
134
135def graphictext primary t = % use outlinetext instead
136    begingroup ;
137    mfun_graphic_text_indeed(t)
138enddef ;
139
140def mfun_graphic_text_indeed(expr t) text rest =
141    interim linecap    := butt ;     % normally rounded
142    interim linejoin   := mitered ;  % normally rounded
143  % interim miterlimit := 10 ;       % todo
144    %
145    let normalwithshade = withshade ;
146    %
147    save reversefill, outlinefill, withshade, withfillcolor, withdrawcolor ;
148    %
149    def mfun_gt_fill  = enddef ;
150    def mfun_gt_draw  = enddef ;
151    def mfun_gt_shade = enddef ;
152    %
153    mfun_gt_color_fill   := false ;
154    mfun_gt_color_draw   := false ;
155    mfun_gt_shade_fill   := false ;
156    mfun_gt_reverse_fill := false ;
157    %
158    def reversefill = hide(mfun_gt_reverse_fill := true) enddef ;
159    def outlinefill = enddef ;
160    def withshade     primary c = hide(mfun_gt_shade_fill := true; def mfun_gt_shade = normalwithshade c enddef ;) enddef ;
161    def withfillcolor primary c = hide(mfun_gt_color_fill := true; def mfun_gt_fill  = withcolor c       enddef ;) enddef ;
162    def withdrawcolor primary c = hide(mfun_gt_color_draw := true; def mfun_gt_draw  = withcolor c       enddef ;) enddef ;
163    %
164    mfun_gt_picture := nullpicture ;
165    addto mfun_gt_picture doublepath origin rest ; % preroll
166    mfun_gt_picture := nullpicture ;
167    %
168    def reversefill = enddef ;
169    def outlinefill = enddef ;
170    def withshade     primary c = enddef ;
171    def withfillcolor primary c = enddef ;
172    def withdrawcolor primary c = enddef ;
173    %
174    if mfun_gt_shade_fill :
175        draw outlinetext.f(t)(mfun_gt_shade) rest;
176    elseif mfun_gt_color_fill and mfun_gt_color_draw :
177        if mfun_gt_reverse_fill :
178            draw outlinetext.r(t)(mfun_gt_default mfun_gt_fill)(mfun_gt_default mfun_gt_draw) rest;
179        else :
180            draw outlinetext.b(t)(mfun_gt_default mfun_gt_draw)(mfun_gt_default mfun_gt_fill) rest;
181        fi ;
182    elseif mfun_gt_color_fill :
183        draw outlinetext.f(t)(mfun_gt_default mfun_gt_fill) rest;
184    elseif mfun_gt_color_draw :
185        draw outlinetext.d(t)(mfun_gt_default mfun_gt_draw) rest ;
186    else :
187        draw outlinetext.d(t)(mfun_gt_default) rest ;
188    fi ;
189    %
190    endgroup ;
191enddef ;
192
193% example
194%
195% beginfig (1) ;
196%     graphictext
197%         "\vbox{\hsize10cm \input tufte }"
198%         scaled 8
199%         withdrawcolor blue
200%         withfillcolor red
201%         withpen pencircle scaled 2pt ;
202% endfig ;
203%
204% beginfig(1) ;
205%       loadfigure "gracht.mp" rotated 20 ;
206%       loadfigure "koe.mp" number 1 scaled 2 ;
207% endfig ;
208%
209% end
210