/*
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.BasicStroke;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
/**
A class that assumes that an edge can yield its shape
and then takes advantage of the fact that containment testing can
be done by stroking the shape with a fat stroke.
NOTE: Ideally, you should be able to draw the same shape that
is used for containment testing. However, in JDK 1.4,
BasicStroke.createStrokedShape returns shitty-looking shapes.
*/
public abstract class ShapeEdge extends AbstractEdge
{
/**
Returns the path that should be stroked to
draw this edge. The path does not include
arrow tips or labels.
@return a path along the edge
*/
public abstract Shape getShape();
public Rectangle2D getBounds(Graphics2D g2)
{
return getShape().getBounds();
}
public boolean contains(Point2D aPoint)
{
final double MAX_DIST = 3;
// the end points may contain small nodes, so don't
// match them
Line2D conn = getConnectionPoints();
if (aPoint.distance(conn.getP1()) <= MAX_DIST
|| aPoint.distance(conn.getP2()) <= MAX_DIST)
return false;
Shape p = getShape();
BasicStroke fatStroke = new BasicStroke(
(float)(2 * MAX_DIST));
Shape fatPath = fatStroke.createStrokedShape(p);
return fatPath.contains(aPoint);
}
}