beta 2011.10.13 21:36

1 files changed, 259 insertions, 0 deletions

diff --git a/metapost/context/base/mp-grph.mpiv b/metapost/context/base/mp-grph.mpiv
new file mode 100644
index 000000000..7291103ec
--- /dev/null
+++ b/metapost/context/base/mp-grph.mpiv
@@ -0,0 +1,259 @@
+%D \module
+%D   [       file=mp-grph.mp,
+%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 =
+    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 ;
+
+endinput
+
+% 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