1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.g2d.element.handler.impl;
14 import java.awt.geom.AffineTransform;
15 import java.awt.geom.Point2D;
17 import org.simantics.g2d.element.ElementHints;
18 import org.simantics.g2d.element.IElement;
19 import org.simantics.g2d.element.handler.Rotate;
22 * @author Toni Kalajainen
24 public class Rotateable implements Rotate {
26 private static final long serialVersionUID = -1218542543108449939L;
28 public static final Rotateable HANDLER = new Rotateable();
31 public void rotate(IElement e, double theta, Point2D origo) {
32 if (Double.isNaN(theta)) return;
33 AffineTransform at = e.getHint(ElementHints.KEY_TRANSFORM);
34 at = (AffineTransform) at.clone();
35 at.rotate(theta, origo.getX(), origo.getY());
36 e.setHint(ElementHints.KEY_TRANSFORM, at);
40 public double getAngle(IElement e) {
41 AffineTransform at = e.getHint(ElementHints.KEY_TRANSFORM);
42 double m01 = at.getShearX();
43 double m11 = at.getScaleY();
44 return -Math.atan2(m01, m11);