/*
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.framework;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
/**
A class that supplies convenience implementations for
a number of methods in the Edge interface
*/
abstract class AbstractEdge implements Edge
{
public Object clone()
{
try
{
return super.clone();
}
catch (CloneNotSupportedException exception)
{
return null;
}
}
public void connect(Node s, Node e)
{
start = s;
end = e;
}
public Node getStart()
{
return start;
}
public Node getEnd()
{
return end;
}
public Rectangle2D getBounds(Graphics2D g2)
{
Line2D conn = getConnectionPoints();
Rectangle2D r = new Rectangle2D.Double();
r.setFrameFromDiagonal(conn.getX1(), conn.getY1(),
conn.getX2(), conn.getY2());
return r;
}
public Line2D getConnectionPoints()
{
Rectangle2D startBounds = start.getBounds();
Rectangle2D endBounds = end.getBounds();
Point2D startCenter = new Point2D.Double(
startBounds.getCenterX(), startBounds.getCenterY());
Point2D endCenter = new Point2D.Double(
endBounds.getCenterX(), endBounds.getCenterY());
Direction toEnd = new Direction(startCenter, endCenter);
return new Line2D.Double(
start.getConnectionPoint(toEnd),
end.getConnectionPoint(toEnd.turn(180)));
}
private Node start;
private Node end;
}