001 /*
002 * LinearGradient.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, 1:54 AM
026 */
027
028 package com.kitfox.svg;
029
030 import com.kitfox.svg.xml.StyleAttribute;
031 import java.awt.geom.*;
032 import java.awt.*;
033
034 import com.kitfox.svg.xml.*;
035 import org.xml.sax.*;
036
037 //import org.apache.batik.ext.awt.*;
038 import com.kitfox.svg.batik.*;
039
040
041 /**
042 * @author Mark McKay
043 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
044 */
045 public class LinearGradient extends Gradient {
046
047 float x1 = 0f;
048 float y1 = 0f;
049 float x2 = 1f;
050 float y2 = 0f;
051
052 /** Creates a new instance of LinearGradient */
053 public LinearGradient() {
054 }
055 /*
056 public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent)
057 {
058 //Load style string
059 super.loaderStartElement(helper, attrs, parent);
060
061 String x1 = attrs.getValue("x1");
062 String x2 = attrs.getValue("x2");
063 String y1 = attrs.getValue("y1");
064 String y2 = attrs.getValue("y2");
065
066 if (x1 != null) this.x1 = (float)XMLParseUtil.parseRatio(x1);
067 if (y1 != null) this.y1 = (float)XMLParseUtil.parseRatio(y1);
068 if (x2 != null) this.x2 = (float)XMLParseUtil.parseRatio(x2);
069 if (y2 != null) this.y2 = (float)XMLParseUtil.parseRatio(y2);
070 }
071 */
072 /*
073 public void loaderEndElement(SVGLoaderHelper helper)
074 {
075 super.loaderEndElement(helper);
076
077 build();
078 }
079 */
080
081 protected void build() throws SVGException
082 {
083 super.build();
084
085 StyleAttribute sty = new StyleAttribute();
086
087 if (getPres(sty.setName("x1"))) x1 = sty.getFloatValueWithUnits();
088
089 if (getPres(sty.setName("y1"))) y1 = sty.getFloatValueWithUnits();
090
091 if (getPres(sty.setName("x2"))) x2 = sty.getFloatValueWithUnits();
092
093 if (getPres(sty.setName("y2"))) y2 = sty.getFloatValueWithUnits();
094 }
095
096 public Paint getPaint(Rectangle2D bounds, AffineTransform xform)
097 {
098 com.kitfox.svg.batik.MultipleGradientPaint.CycleMethodEnum method;
099 switch (spreadMethod)
100 {
101 default:
102 case SM_PAD:
103 method = com.kitfox.svg.batik.MultipleGradientPaint.NO_CYCLE;
104 break;
105 case SM_REPEAT:
106 method = com.kitfox.svg.batik.MultipleGradientPaint.REPEAT;
107 break;
108 case SM_REFLECT:
109 method = com.kitfox.svg.batik.MultipleGradientPaint.REFLECT;
110 break;
111 }
112
113 com.kitfox.svg.batik.LinearGradientPaint paint;
114 if (gradientUnits == GU_USER_SPACE_ON_USE)
115 {
116 // paint = new LinearGradientPaint(x1, y1, x2, y2, getStopFractions(), getStopColors(), method);
117 paint = new com.kitfox.svg.batik.LinearGradientPaint(
118 new Point2D.Float(x1, y1),
119 new Point2D.Float(x2, y2),
120 getStopFractions(),
121 getStopColors(),
122 method,
123 com.kitfox.svg.batik.MultipleGradientPaint.SRGB,
124 gradientTransform);
125 }
126 else
127 {
128 AffineTransform viewXform = new AffineTransform();
129 viewXform.translate(bounds.getX(), bounds.getY());
130
131 //This is a hack to get around shapes that have a width or height of 0. Should be close enough to the true answer.
132 double width = bounds.getWidth();
133 double height = bounds.getHeight();
134 if (width == 0) width = 1;
135 if (height == 0) height = 1;
136 viewXform.scale(width, height);
137
138 viewXform.concatenate(gradientTransform);
139
140 paint = new com.kitfox.svg.batik.LinearGradientPaint(
141 new Point2D.Float(x1, y1),
142 new Point2D.Float(x2, y2),
143 getStopFractions(),
144 getStopColors(),
145 method,
146 com.kitfox.svg.batik.MultipleGradientPaint.SRGB,
147 viewXform);
148 }
149
150 return paint;
151 }
152
153 /**
154 * Updates all attributes in this diagram associated with a time event.
155 * Ie, all attributes with track information.
156 * @return - true if this node has changed state as a result of the time
157 * update
158 */
159 public boolean updateTime(double curTime) throws SVGException
160 {
161 // if (trackManager.getNumTracks() == 0) return stopChange;
162 boolean changeState = super.updateTime(curTime);
163
164 //Get current values for parameters
165 StyleAttribute sty = new StyleAttribute();
166 boolean shapeChange = false;
167
168 if (getPres(sty.setName("x1")))
169 {
170 float newVal = sty.getFloatValueWithUnits();
171 if (newVal != x1)
172 {
173 x1 = newVal;
174 shapeChange = true;
175 }
176 }
177
178 if (getPres(sty.setName("y1")))
179 {
180 float newVal = sty.getFloatValueWithUnits();
181 if (newVal != y1)
182 {
183 y1 = newVal;
184 shapeChange = true;
185 }
186 }
187
188 if (getPres(sty.setName("x2")))
189 {
190 float newVal = sty.getFloatValueWithUnits();
191 if (newVal != x2)
192 {
193 x2 = newVal;
194 shapeChange = true;
195 }
196 }
197
198 if (getPres(sty.setName("y2")))
199 {
200 float newVal = sty.getFloatValueWithUnits();
201 if (newVal != y2)
202 {
203 y2 = newVal;
204 shapeChange = true;
205 }
206 }
207
208 return changeState || shapeChange;
209 }
210 }