Source Code Cross Referenced for RadialGradientPainter.java in  » Swing-Library » abeille-forms-designer » com » jeta » forms » gui » effects » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » abeille forms designer » com.jeta.forms.gui.effects 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2004 JETA Software, Inc.  All rights reserved.
003:         * 
004:         * Redistribution and use in source and binary forms, with or without modification, 
005:         * are permitted provided that the following conditions are met:
006:         *
007:         *  o Redistributions of source code must retain the above copyright notice, 
008:         *    this list of conditions and the following disclaimer.
009:         *
010:         *  o Redistributions in binary form must reproduce the above copyright notice, 
011:         *    this list of conditions and the following disclaimer in the documentation 
012:         *    and/or other materials provided with the distribution.
013:         *
014:         *  o Neither the name of JETA Software nor the names of its contributors may 
015:         *    be used to endorse or promote products derived from this software without 
016:         *    specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
021:         * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
022:         * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
023:         * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
024:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
025:         * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
026:         * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
027:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028:         */
029:
030:        package com.jeta.forms.gui.effects;
031:
032:        import java.awt.Color;
033:        import java.awt.Component;
034:        import java.awt.Graphics;
035:        import java.awt.Graphics2D;
036:        import java.awt.Paint;
037:        import java.awt.Rectangle;
038:
039:        import javax.swing.LookAndFeel;
040:        import javax.swing.UIManager;
041:
042:        import org.apache.batik.ext.awt.RadialGradientPaint;
043:
044:        import com.jeta.forms.store.properties.effects.RadialGradientProperty;
045:
046:        /**
047:         * This class is an implementation of a Painter that renders a radial gradient
048:         * on part of a canvas or component. This class uses the Batik SVG library for
049:         * rendering the gradient. See <a
050:         * href="http://xml.apache.org/batik/">http://xml.apache.org/batik/</a>
051:         * 
052:         * @author Jeff Tassin
053:         */
054:        public class RadialGradientPainter implements  Painter {
055:            /**
056:             * The property that defines the gradient settings.
057:             */
058:            private RadialGradientProperty m_gradient_prop;
059:
060:            /**
061:             * A paint object derived from the gradient property. It is cached so we
062:             * don't have to re-instantiate with every paint.
063:             */
064:            private Paint m_cached_paint;
065:
066:            /**
067:             * A rectangle used as a basis for the gradient paint. This value is checked
068:             * everytime the paint method is called. If the paint area has changed, we
069:             * regenerate the Paint object.
070:             */
071:            private Rectangle m_last_rect = new Rectangle();
072:
073:            /**
074:             * We keep track of the look and feel. If it changes, we need to regenerate
075:             * the paint
076:             */
077:            private LookAndFeel m_look_and_feel;
078:
079:            /**
080:             * Flag that determines how the radius of this gradient is calculated
081:             */
082:            private int m_radius_type = SQUARE_BASED;
083:
084:            /**
085:             * The radius is calculated based on the distance from the center of a
086:             * rectangle to its corners or sides.
087:             */
088:            public static final int SQUARE_BASED = 0;
089:
090:            /**
091:             * The radius is calculated as the width of the paint area.
092:             */
093:            public static final int WIDTH_BASED = 1;
094:
095:            /**
096:             * The radius is calculated as the height of the paint area.
097:             */
098:            public static final int HEIGHT_BASED = 2;
099:
100:            /**
101:             * Creates a <code>RadialGradientProperty</code> instance with no paint
102:             * attributes.
103:             */
104:            public RadialGradientPainter() {
105:
106:            }
107:
108:            /**
109:             * Creates a <code>RadialGradientProperty</code> instance with the
110:             * specified paint properties.
111:             */
112:            public RadialGradientPainter(RadialGradientProperty prop) {
113:                m_gradient_prop = prop;
114:            }
115:
116:            /**
117:             * Calculate the radius used for this radial gradient.
118:             * 
119:             * @return the radius for the radial paint
120:             */
121:            private double calculateRadius(double width, double height,
122:                    int magnitude) {
123:                if (m_radius_type == WIDTH_BASED)
124:                    return width * magnitude / 100.0;
125:                else if (m_radius_type == HEIGHT_BASED)
126:                    return height * magnitude / 100.0;
127:                else
128:                    return Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2))
129:                            * magnitude / 100.0;
130:            }
131:
132:            /**
133:             * Creates a paint object based on the given rectangle and gradient
134:             * property.
135:             * 
136:             * @param rect
137:             *            the rectangle that defines the area for the gradient.
138:             * @param gp
139:             *            the gradient properties used to define the paint.
140:             * @return a paint object used for rendering the gradient on a graphics
141:             *         context.
142:             */
143:            private Paint createPaint(Rectangle rect, RadialGradientProperty gp) {
144:                double w_half = rect.getWidth() / 2.0;
145:                double h_half = rect.getHeight() / 2.0;
146:
147:                double x = rect.getX() + w_half;
148:                double y = rect.getY() + h_half;
149:                double radius = gp.getMagnitude() * rect.getWidth() / 400.0;
150:
151:                if (gp.getPosition() == RadialGradientProperty.TOP_LEFT) {
152:                    x = rect.getX();
153:                    y = rect.getY();
154:                    radius = calculateRadius(w_half, h_half, gp.getMagnitude());
155:                } else if (gp.getPosition() == RadialGradientProperty.TOP_CENTER) {
156:                    x = w_half;
157:                    y = rect.getY();
158:                    radius = w_half * gp.getMagnitude() / 100.0;
159:                } else if (gp.getPosition() == RadialGradientProperty.TOP_RIGHT) {
160:                    x = rect.getX() + rect.getWidth();
161:                    y = rect.getY();
162:                    radius = calculateRadius(w_half, h_half, gp.getMagnitude());
163:                } else if (gp.getPosition() == RadialGradientProperty.BOTTOM_LEFT) {
164:                    x = rect.getX();
165:                    y = rect.getY() + rect.getHeight();
166:                    radius = calculateRadius(w_half, h_half, gp.getMagnitude());
167:                } else if (gp.getPosition() == RadialGradientProperty.BOTTOM_CENTER) {
168:                    x = w_half;
169:                    y = rect.getY() + rect.getHeight();
170:                    radius = w_half * gp.getMagnitude() / 100.0;
171:                } else if (gp.getPosition() == RadialGradientProperty.BOTTOM_RIGHT) {
172:                    x = rect.getX() + rect.getWidth();
173:                    y = rect.getY() + rect.getHeight();
174:                    radius = calculateRadius(w_half, h_half, gp.getMagnitude());
175:                } else if (gp.getPosition() == RadialGradientProperty.LEFT_CENTER) {
176:                    x = rect.getX();
177:                    y = rect.getY() + h_half;
178:                    radius = h_half * gp.getMagnitude() / 100.0;
179:                } else if (gp.getPosition() == RadialGradientProperty.RIGHT_CENTER) {
180:                    x = rect.getX() + rect.getWidth();
181:                    y = rect.getY() + h_half;
182:                    radius = h_half * gp.getMagnitude() / 100.0;
183:                }
184:
185:                float[] fractions = new float[] { 0.0f, 1.0f };
186:                Color[] colors = new Color[] { gp.getStartColor().getColor(),
187:                        gp.getEndColor().getColor() };
188:                RadialGradientPaint paint = new RadialGradientPaint((float) x,
189:                        (float) y, (float) radius, fractions, colors);
190:                return paint;
191:            }
192:
193:            /**
194:             * Painter implementation. Paints a radial gradient on a given graphics
195:             * context.
196:             * 
197:             * @param g
198:             *            the graphics context
199:             * @param rect
200:             *            the rectangle that defines the region to paint. Note, that
201:             *            this is different than the clipping rectangle.
202:             */
203:            public void paint(Component c, Graphics g, Rectangle rect) {
204:                if (rect == null || m_gradient_prop == null)
205:                    return;
206:
207:                Graphics2D g2 = (Graphics2D) g;
208:                Paint old_paint = g2.getPaint();
209:
210:                LookAndFeel lf = UIManager.getLookAndFeel();
211:                if (m_look_and_feel != lf) {
212:                    m_cached_paint = null;
213:                    m_look_and_feel = lf;
214:                }
215:
216:                if (m_cached_paint == null || !rect.equals(m_last_rect)) {
217:                    m_last_rect.setBounds(rect.x, rect.y, rect.width,
218:                            rect.height);
219:                    m_cached_paint = createPaint(rect, m_gradient_prop);
220:                }
221:
222:                g2.setPaint(m_cached_paint);
223:
224:                Rectangle clip_rect = g.getClipBounds();
225:                if (rect.intersects(clip_rect)) {
226:                    Rectangle irect = rect.intersection(clip_rect);
227:                    g.fillRect(irect.x, irect.y, irect.width, irect.height);
228:                    g2.setPaint(old_paint);
229:                }
230:
231:                g2.setPaint(old_paint);
232:            }
233:
234:            /**
235:             * Sets the gradient attributes for this painter
236:             * 
237:             * @param prop
238:             *            the gradient property to associate with this painter.
239:             */
240:            public void setGradientProperty(RadialGradientProperty prop) {
241:                m_cached_paint = null;
242:                m_gradient_prop = prop;
243:            }
244:
245:            /**
246:             * Sets the radius type for this painter. Valid values are:
247:             * RadialGradientPainter.SQUARE_BASED RadialGradientPainter.WIDTH_BASED
248:             * RadialGradientPainter.HEIGHT_BASED
249:             * 
250:             * @param rtype
251:             *            the radius type to set.
252:             */
253:            public void setRadiusType(int rtype) {
254:                m_radius_type = rtype;
255:            }
256:        }
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