add "value" to drawable as a general purpose variable.

src/lib/aqdiagram/draw/w_drawable.c

@@ -236,6 +236,32 @@ void AQDG_DrawableWidget_SetText(AQDG_OBJECT *object, const char *s)
 
 
 
+double AQDG_DrawableWidget_GetValue(const AQDG_OBJECT *object)
+{
+  if (object) {
+    AQDG_OBJECT_DRAWABLE *xo;
+
+    xo=GWEN_INHERIT_GETDATA(AQDG_OBJECT, AQDG_OBJECT_DRAWABLE, object);
+    return xo?xo->value:0.0;
+  }
+  return 0.0;
+}
+
+
+
+void AQDG_DrawableWidget_SetValue(AQDG_OBJECT *object, double v)
+{
+  if (object) {
+    AQDG_OBJECT_DRAWABLE *xo;
+
+    xo=GWEN_INHERIT_GETDATA(AQDG_OBJECT, AQDG_OBJECT_DRAWABLE, object);
+    if (xo)
+      xo->value=v;
+  }
+}
+
+
+
 AQDG_WIDGET_DRAWABLE_DRAW_FN AQDG_DrawableWidget_SetDrawFn(AQDG_OBJECT *object, AQDG_WIDGET_DRAWABLE_DRAW_FN fn)
 {
   if (object) {

src/lib/aqdiagram/draw/w_drawable.h

@@ -52,6 +52,9 @@ AQDG_API void AQDG_DrawableWidget_SetBackgroundPenId(AQDG_OBJECT *object, int i)
 AQDG_API const char *AQDG_DrawableWidget_GetText(const AQDG_OBJECT *object);
 AQDG_API void AQDG_DrawableWidget_SetText(AQDG_OBJECT *object, const char *s);
 
+AQDG_API double AQDG_DrawableWidget_GetValue(const AQDG_OBJECT *object);
+AQDG_API void AQDG_DrawableWidget_SetValue(AQDG_OBJECT *object, double v);
+
 AQDG_API int AQDG_DrawableWidget_GetContentWidth(const AQDG_OBJECT *object);
 AQDG_API void AQDG_DrawableWidget_SetContentWidth(AQDG_OBJECT *object, int i);
 

src/lib/aqdiagram/draw/w_drawable_p.h

@@ -20,6 +20,7 @@ struct AQDG_OBJECT_DRAWABLE {
   int backgroundPenId;
 
   char *text;
+  double value;
 
   AQDG_WIDGET_DRAWABLE_DRAW_FN drawFn;
 };