/*
* @(#)ElbowConnection.java
*
* Project: JHotdraw - a GUI framework for technical drawings
* http://www.jhotdraw.org
* http://jhotdraw.sourceforge.net
* Copyright: (c) by the original author(s) and all contributors
* License: Lesser GNU Public License (LGPL)
* http://www.opensource.org/licenses/lgpl-license.html
*/
package org.jhotdraw.figures;
import java.awt.*;
import java.util.List;
import org.jhotdraw.framework.*;
import org.jhotdraw.standard.*;
import org.jhotdraw.util.*;
/**
* A LineConnection that constrains a connection to
* orthogonal lines.
*
* @version <$CURRENT_VERSION$>
*/
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 HandleEnumeration handles() {
List handles = CollectionsFactory.current().createList(fPoints.size()*2);
handles.add(new ChangeConnectionStartHandle(this));
for (int i = 1; i < fPoints.size()-1; i++) {
handles.add(new NullHandle(this, locator(i)));
}
handles.add(new ChangeConnectionEndHandle(this));
for (int i = 0; i < fPoints.size()-1; i++) {
handles.add(new ElbowHandle(this, i));
}
return new HandleEnumerator(handles);
}
public Locator connectedTextLocator(Figure f) {
return new ElbowTextLocator();
}
protected void updatePoints() {
willChange();
Point start = startPoint();
Point end = endPoint();
fPoints.clear();
fPoints.add(start);
if (start.x == end.x || start.y == end.y) {
fPoints.add(end);
}
else {
Rectangle r1 = getStartConnector().owner().displayBox();
Rectangle r2 = getEndConnector().owner().displayBox();
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.add(new Point(start.x, (start.y + end.y)/2));
fPoints.add(new Point(end.x, (start.y + end.y)/2));
}
else {
fPoints.add(new Point((start.x + end.x)/2, start.y));
fPoints.add(new Point((start.x + end.x)/2, end.y));
}
fPoints.add(end);
}
changed();
}
}
class ElbowTextLocator extends AbstractLocator {
public Point locate(Figure owner) {
Point p = owner.center();
return new Point(p.x, p.y-10); // hack
}
}