Re: UML: use case diagrams: actors and connection points

On Sat, 9 Feb 2002, Neil Zanella wrote:


There are some problems when specifying generalization relationships
among use case diagram actors in dia. Such relationships are described
in The Unified Modeling Language User Guide by Grady Booch, James 
Rumbaugh, and Ivar Jacobson. The problem is that the label used
to describe the role of a stick figure is below the connection
points pertaining to that figure. Thus the hollow triangle of
the arrow representing the generalizing relationship overlaps
with the text which makes the text hard to read even when the
arrow is Sent to Back. It would be nice if the connection points
were  below the text. This is how they are used in the book.

I see the problem, fortunately the solution is not far away.  Of course
making this change will momentarily mess up saved diagrams.  Apply the
patch below, or get the new CVS version tomorrow (when the mirrors have


Index: objects/UML/actor.c
RCS file: /cvs/gnome/dia/objects/UML/actor.c,v
retrieving revision 1.23
diff -u -r1.23 actor.c
--- objects/UML/actor.c 2002/01/30 11:05:35     1.23
+++ objects/UML/actor.c 2002/02/09 21:34:08
@@ -264,7 +264,7 @@
   Point p;
   elem->width = ACTOR_WIDTH + ACTOR_MARGIN_X;
-  elem->height = ACTOR_HEIGHT;
+  elem->height = ACTOR_HEIGHT+actor->text->height;
   /* Update connections: */
   actor->connections[0].pos.x = elem->corner.x;
@@ -288,7 +288,7 @@
   p = elem->corner;
   p.x += elem->width/2;
-  p.y +=  ACTOR_HEIGHT + actor->text->height;
+  p.y +=  ACTOR_HEIGHT + actor->text->ascent;
   text_set_position(actor->text, &p);
   /* Add bounding box for text: */

Lars Clausen (| Hårdgrim of Numenor
"I do not agree with a word that you say, but I   |----------------------------
will defend to the death your right to say it."   | Where are we going, and
    --Evelyn Beatrice Hall paraphrasing Voltaire  | what's with the handbasket?

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