001 /*
002 * Animate.java
003 *
004 * The Salamander Project - 2D and 3D graphics libraries in Java
005 * Copyright (C) 2004 Mark McKay
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020 *
021 * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
022 * projects can be found at http://www.kitfox.com
023 *
024 * Created on August 15, 2004, 2:51 AM
025 */
026
027 package com.kitfox.svg.animation;
028
029 import com.kitfox.svg.SVGElement;
030 import com.kitfox.svg.SVGException;
031 import com.kitfox.svg.SVGLoaderHelper;
032 import com.kitfox.svg.animation.parser.AnimTimeParser;
033 import com.kitfox.svg.xml.ColorTable;
034 import com.kitfox.svg.xml.StyleAttribute;
035 import java.awt.Color;
036 import org.xml.sax.Attributes;
037 import org.xml.sax.SAXException;
038
039
040 /**
041 * @author Mark McKay
042 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
043 */
044 public class AnimateColor extends AnimateBase implements AnimateColorIface
045 {
046
047 protected Color fromValue;
048 protected Color toValue;
049
050 /** Creates a new instance of Animate */
051 public AnimateColor()
052 {
053 }
054
055 public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent) throws SAXException
056 {
057 //Load style string
058 super.loaderStartElement(helper, attrs, parent);
059
060 String strn = attrs.getValue("from");
061 fromValue = ColorTable.parseColor(strn);
062
063 strn = attrs.getValue("to");
064 toValue = ColorTable.parseColor(strn);
065 }
066
067
068 /**
069 * Evaluates this animation element for the passed interpolation time. Interp
070 * must be on [0..1].
071 */
072 public Color evalColor(double interp)
073 {
074 int r1 = fromValue.getRed();
075 int g1 = fromValue.getGreen();
076 int b1 = fromValue.getBlue();
077 int r2 = toValue.getRed();
078 int g2 = toValue.getGreen();
079 int b2 = toValue.getBlue();
080 double invInterp = 1.0 - interp;
081
082 return new Color((int)(r1 * invInterp + r2 * interp),
083 (int)(g1 * invInterp + g2 * interp),
084 (int)(b1 * invInterp + b2 * interp));
085 }
086
087 protected void rebuild(AnimTimeParser animTimeParser) throws SVGException
088 {
089 super.rebuild(animTimeParser);
090
091 StyleAttribute sty = new StyleAttribute();
092
093 if (getPres(sty.setName("from")))
094 {
095 String strn = sty.getStringValue();
096 fromValue = ColorTable.parseColor(strn);
097 }
098
099 if (getPres(sty.setName("to")))
100 {
101 String strn = sty.getStringValue();
102 toValue = ColorTable.parseColor(strn);
103 }
104 }
105 }