ReturnEdge.java

/*
Violet - A program for editing UML diagrams.

Copyright (C) 2002 Cay S. Horstmann (http://horstmann.com)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package com.horstmann.violet;

import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;

import com.horstmann.violet.framework.Node;
import com.horstmann.violet.framework.SegmentedLineEdge;

/**
   An edge that joins two call nodes.
*/
public class ReturnEdge extends SegmentedLineEdge
{
   public ReturnEdge()
   {
      setEndArrowHead(ArrowHead.V);
      setLineStyle(LineStyle.DOTTED);
   }

   public ArrayList getPoints()
   {
      ArrayList a = new ArrayList();
      Node n = getEnd();
      Rectangle2D start = getStart().getBounds();
      Rectangle2D end = getEnd().getBounds();
      if (n instanceof PointNode) // show nicely in tool bar
      {
         a.add(new Point2D.Double(end.getX(), end.getY()));
         a.add(new Point2D.Double(start.getMaxX(), end.getY()));
      }      
      else if (start.getCenterX() < end.getCenterX())
      {
         a.add(new Point2D.Double(start.getMaxX(), start.getMaxY()));
         a.add(new Point2D.Double(end.getX(), start.getMaxY()));
      }
      else
      {
         a.add(new Point2D.Double(start.getX(), start.getMaxY()));
         a.add(new Point2D.Double(end.getMaxX(), start.getMaxY()));
      }
      return a;
   }
}