001 /*
002 * BoundedElement.java
003 *
004 *
005 * The Salamander Project - 2D and 3D graphics libraries in Java
006 * Copyright (C) 2004 Mark McKay
007 *
008 * This library is free software; you can redistribute it and/or
009 * modify it under the terms of the GNU Lesser General Public
010 * License as published by the Free Software Foundation; either
011 * version 2.1 of the License, or (at your option) any later version.
012 *
013 * This library is distributed in the hope that it will be useful,
014 * but WITHOUT ANY WARRANTY; without even the implied warranty of
015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
016 * Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public
019 * License along with this library; if not, write to the Free Software
020 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
021 *
022 * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
023 * projects can be found at http://www.kitfox.com
024 *
025 * Created on January 26, 2004, 9:00 AM
026 */
027
028 package com.kitfox.svg;
029
030 import com.kitfox.svg.xml.StyleAttribute;
031 import java.awt.Shape;
032 import java.awt.geom.AffineTransform;
033 import java.awt.geom.Rectangle2D;
034
035
036 /**
037 * Maintains bounding box for this element
038 *
039 * @author Mark McKay
040 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
041 */
042 public class TransformableElement extends SVGElement
043 {
044
045 AffineTransform xform = null;
046 // AffineTransform invXform = null;
047
048 /** Creates a new instance of BoundedElement */
049 public TransformableElement()
050 {
051 }
052
053 public TransformableElement(String id, SVGElement parent)
054 {
055 super(id, parent);
056 }
057
058 /**
059 * Fetches a copy of the cached AffineTransform. Note that this
060 * value will only be valid after the node has been updated.
061 *
062 * @return
063 */
064 public AffineTransform getXForm()
065 {
066 return new AffineTransform(xform);
067 }
068 /*
069 public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent)
070 {
071 //Load style string
072 super.loaderStartElement(helper, attrs, parent);
073
074 String transform = attrs.getValue("transform");
075 if (transform != null)
076 {
077 xform = parseTransform(transform);
078 }
079 }
080 */
081
082 protected void build() throws SVGException
083 {
084 super.build();
085
086 StyleAttribute sty = new StyleAttribute();
087
088 if (getPres(sty.setName("transform")))
089 {
090 xform = parseTransform(sty.getStringValue());
091 }
092 }
093
094 protected Shape shapeToParent(Shape shape)
095 {
096 if (xform == null) return shape;
097 return xform.createTransformedShape(shape);
098 }
099
100 protected Rectangle2D boundsToParent(Rectangle2D rect)
101 {
102 if (xform == null) return rect;
103 return xform.createTransformedShape(rect).getBounds2D();
104 }
105
106 /**
107 * Updates all attributes in this diagram associated with a time event.
108 * Ie, all attributes with track information.
109 * @return - true if this node has changed state as a result of the time
110 * update
111 */
112 public boolean updateTime(double curTime) throws SVGException
113 {
114 StyleAttribute sty = new StyleAttribute();
115
116 if (getPres(sty.setName("transform")))
117 {
118 AffineTransform newXform = parseTransform(sty.getStringValue());
119 if (!newXform.equals(xform))
120 {
121 xform = newXform;
122 return true;
123 }
124 }
125
126 return false;
127 }
128 }