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