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

package CH.ifa.draw.figures;

import java.awt.Point;
import java.awt.Rectangle;
import java.util.Vector;

import CH.ifa.draw.framework.Figure;
import CH.ifa.draw.framework.Locator;
import CH.ifa.draw.standard.ChangeConnectionEndHandle;
import CH.ifa.draw.standard.ChangeConnectionStartHandle;
import CH.ifa.draw.standard.NullHandle;
import CH.ifa.draw.util.Geom;

/**
 * A LineConnection that constrains a connection to
 * orthogonal lines.
 */
public  class ElbowConnection extends LineConnection {

	/*
	 * Serialization support.
	 */
	private static final long serialVersionUID = 2193968743082078559L;
	private int elbowConnectionSerializedDataVersion = 1;

	public ElbowConnection() {
		super();
	}

	public void updateConnection() {
		super.updateConnection();
		updatePoints();
	}

	public void layoutConnection() {
	}

	/**
	 * Gets the handles of the figure.
	 */
	public Vector handles() {
		Vector handles = new Vector(fPoints.size()*2);
		handles.addElement(new ChangeConnectionStartHandle(this));
		for (int i = 1; i < fPoints.size()-1; i++)
			handles.addElement(new NullHandle(this, locator(i)));
		handles.addElement(new ChangeConnectionEndHandle(this));
		for (int i = 0; i < fPoints.size()-1; i++)
			handles.addElement(new ElbowHandle(this, i));
		return handles;
	}

	public Locator connectedTextLocator(Figure f) {
		return new ElbowTextLocator();
	}

	protected void updatePoints() {
		willChange();
		Point start = startPoint();
		Point end = endPoint();
		fPoints.removeAllElements();
		fPoints.addElement(start);

		if (start.x == end.x || start.y == end.y) {
			fPoints.addElement(end);
		}
		else {
			Rectangle r1 = start().owner().displayBox();
			Rectangle r2 = end().owner().displayBox();

			int x1, y1, x2, y2;
			int dir = Geom.direction(r1.x + r1.width/2, r1.y + r1.height/2,
						r2.x + r2.width/2, r2.y + r2.height/2);
			if (dir == Geom.NORTH || dir == Geom.SOUTH) {
				fPoints.addElement(new Point(start.x, (start.y + end.y)/2));
				fPoints.addElement(new Point(end.x, (start.y + end.y)/2));
			}
			else {
				fPoints.addElement(new Point((start.x + end.x)/2, start.y));
				fPoints.addElement(new Point((start.x + end.x)/2, end.y));
			}
			fPoints.addElement(end);
		}
		changed();
	}
}

