new feature: simulated duplex edges using parallel edges.

- head arrow takes first color, tail arrow takes second color

diff --git a/lib/common/emit.c b/lib/common/emit.c
index baa0b9c6ec87dd5aed862314570534c46b0c4cdb..266e6e0a3456377e4577271f378e2235fd1134f6 100644 (file)
--- a/lib/common/emit.c
+++ b/lib/common/emit.c
@@ -739,6 +739,7 @@ void emit_edge_graphics(GVJ_t * job, edge_t * e)
 {
     int i, j, cnum, numc = 0;
     char *color, *pencolor, *fillcolor, *style;
+    char *headcolor, *tailcolor, *lastcolor;
     char *colors = NULL;
     char **styles = 0;
     char **sp;
@@ -847,18 +848,23 @@ void emit_edge_graphics(GVJ_t * job, edge_t * e)
                tmplist[j].x = pf3.x - numc2 * offlist[j].x;
                tmplist[j].y = pf3.y - numc2 * offlist[j].y;
            }
+           lastcolor = headcolor = tailcolor = color;
            colors = strdup(color);
            for (cnum = 0, color = strtok(colors, ":"); color;
-                cnum++, color = strtok(0, ":")) {
-               if (! (ED_gui_state(e) & (GUI_STATE_ACTIVE | GUI_STATE_SELECTED))) {
-                   if (color[0]) {
+               cnum++, color = strtok(0, ":")) {
+               if (!color[0])
+                   color = DEFAULT_COLOR;
+               if (color != lastcolor) {
+                   if (! (ED_gui_state(e) & (GUI_STATE_ACTIVE | GUI_STATE_SELECTED))) {
                        gvrender_set_pencolor(job, color);
                        gvrender_set_fillcolor(job, color);
-                   } else {
-                       gvrender_set_pencolor(job, DEFAULT_COLOR);
-                       gvrender_set_fillcolor(job, DEFAULT_COLOR);
                    }
+                   lastcolor = color;
                }
+               if (cnum == 0)
+                   headcolor = tailcolor = color;
+               if (cnum == 1)
+                   tailcolor = color;
                for (i = 0; i < tmpspl.size; i++) {
                    tmplist = tmpspl.list[i].list;
                    offlist = offspl.list[i].list;
@@ -871,10 +877,24 @@ void emit_edge_graphics(GVJ_t * job, edge_t * e)
                }
            }
            if (bz.sflag) {
+               if (color != tailcolor) {
+                   color = tailcolor;
+                   if (! (ED_gui_state(e) & (GUI_STATE_ACTIVE | GUI_STATE_SELECTED))) {
+                       gvrender_set_pencolor(job, color);
+                       gvrender_set_fillcolor(job, color);
+                   }
+               }
                arrow_gen(job, EMIT_TDRAW, bz.sp, bz.list[0],
                        scale, bz.sflag);
            }
            if (bz.eflag) {
+               if (color != headcolor) {
+                   color = headcolor;
+                   if (! (ED_gui_state(e) & (GUI_STATE_ACTIVE | GUI_STATE_SELECTED))) {
+                       gvrender_set_pencolor(job, color);
+                       gvrender_set_fillcolor(job, color);
+                   }
+               }
                arrow_gen(job, EMIT_HDRAW, bz.ep, bz.list[bz.size - 1],
                        scale, bz.eflag);
            }