Ptidej-v5.2-master/PADL Serialiser DB4O Tests/rsc/JHotDraw v5.1/src/CH/ifa/draw/standard/ChopBoxConnector.java
/*
 * @(#)ChopBoxConnector.java 5.1
 *
 */

package CH.ifa.draw.standard;

import java.awt.Point;
import java.awt.Rectangle;

import CH.ifa.draw.framework.ConnectionFigure;
import CH.ifa.draw.framework.Figure;
import CH.ifa.draw.util.Geom;

/**
 * A ChopBoxConnector locates connection points by
 * choping the connection between the centers of the
 * two figures at the display box.
 * @see Connector
 */
public class ChopBoxConnector extends AbstractConnector {

	/*
	 * Serialization support.
	 */
	private static final long serialVersionUID = -1461450322712345462L;

	public ChopBoxConnector() { // only used for Storable implementation
	}

	public ChopBoxConnector(Figure owner) {
		super(owner);
	}

	public Point findStart(ConnectionFigure connection) {
		Figure startFigure = connection.start().owner();
		Rectangle r2 = connection.end().displayBox();
		Point r2c = null;

		if (connection.pointCount() == 2)
			r2c = new Point(r2.x + r2.width/2, r2.y + r2.height/2);
		 else
			r2c = connection.pointAt(1);

		return chop(startFigure, r2c);
	}

	public Point findEnd(ConnectionFigure connection) {
		Figure endFigure = connection.end().owner();
		Rectangle r1 = connection.start().displayBox();
		Point r1c = null;

		if (connection.pointCount() == 2)
			r1c = new Point(r1.x + r1.width/2, r1.y + r1.height/2);
		 else
			r1c = connection.pointAt(connection.pointCount()-2);

		return chop(endFigure, r1c);
	}

	protected Point chop(Figure target, Point from) {
		Rectangle r = target.displayBox();
		return Geom.angleToPoint(r, (Geom.pointToAngle(r, from)));
	}
}

