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Java > Open Source Codes > org > jfree > ui > StandardGradientPaintTransformer


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * -------------------------------------
28  * StandardGradientPaintTransformer.java
29  * -------------------------------------
30  * (C) Copyright 2003-2005, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: StandardGradientPaintTransformer.java,v 1.8 2005/10/18 13:18:34 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 28-Oct-2003 : Version 1 (DG);
40  * 19-Mar-2004 : Added equals() method (DG);
41  *
42  */
43
44 package org.jfree.ui;
45
46 import java.awt.GradientPaint JavaDoc;
47 import java.awt.Shape JavaDoc;
48 import java.awt.geom.Rectangle2D JavaDoc;
49 import java.io.Serializable JavaDoc;
50
51 import org.jfree.util.PublicCloneable;
52
53 /**
54  * Transforms a <code>GradientPaint</code> to range over the width of a target
55  * shape.
56  * @author David Gilbert
57  */
58 public class StandardGradientPaintTransformer
59     implements GradientPaintTransformer, Cloneable JavaDoc, PublicCloneable,
60                Serializable JavaDoc {
61     
62     /** For serialization. */
63     private static final long serialVersionUID = -8155025776964678320L;
64
65     /** The transform type. */
66     private GradientPaintTransformType type;
67     
68     /**
69      * Creates a new transformer.
70      */
71     public StandardGradientPaintTransformer() {
72         this(GradientPaintTransformType.VERTICAL);
73     }
74     
75     /**
76      * Creates a new transformer.
77      *
78      * @param type the transform type.
79      */
80     public StandardGradientPaintTransformer(
81             final GradientPaintTransformType type) {
82         this.type = type;
83     }
84     
85     /**
86      * Transforms a <code>GradientPaint</code> instance.
87      *
88      * @param paint the original paint.
89      * @param target the target shape.
90      *
91      * @return The transformed paint.
92      */
93     public GradientPaint JavaDoc transform(final GradientPaint JavaDoc paint,
94                                    final Shape JavaDoc target) {
95         
96         GradientPaint JavaDoc result = paint;
97         final Rectangle2D JavaDoc bounds = target.getBounds2D();
98         
99         if (this.type.equals(GradientPaintTransformType.VERTICAL)) {
100             result = new GradientPaint JavaDoc(
101                 (float) bounds.getCenterX(), (float) bounds.getMinY(),
102                 paint.getColor1(), (float) bounds.getCenterX(),
103                 (float) bounds.getMaxY(), paint.getColor2()
104             );
105         }
106         else if (this.type.equals(GradientPaintTransformType.HORIZONTAL)) {
107             result = new GradientPaint JavaDoc(
108                 (float) bounds.getMinX(), (float) bounds.getCenterY(),
109                 paint.getColor1(), (float) bounds.getMaxX(),
110                 (float) bounds.getCenterY(), paint.getColor2()
111             );
112         }
113         else if (this.type.equals(GradientPaintTransformType.CENTER_HORIZONTAL))
114         {
115             result = new GradientPaint JavaDoc(
116                 (float) bounds.getCenterX(), (float) bounds.getCenterY(),
117                 paint.getColor1(), (float) bounds.getMaxX(),
118                 (float) bounds.getCenterY(), paint.getColor2(), true
119             );
120         }
121         else if (this.type.equals(GradientPaintTransformType.CENTER_VERTICAL)) {
122             result = new GradientPaint JavaDoc(
123                 (float) bounds.getCenterX(), (float) bounds.getMinY(),
124                 paint.getColor1(), (float) bounds.getCenterX(),
125                 (float) bounds.getCenterY(), paint.getColor2(), true
126             );
127         }
128         
129         return result;
130     }
131     
132     /**
133      * Tests this instance for equality with an arbitrary object.
134      *
135      * @param obj the object to test against (<code>null</code> permitted).
136      *
137      * @return A boolean.
138      */
139     public boolean equals(final Object JavaDoc obj) {
140         if (obj == this) {
141             return true;
142         }
143         if (!(obj instanceof StandardGradientPaintTransformer)) {
144             return false;
145         }
146         final StandardGradientPaintTransformer that
147             = (StandardGradientPaintTransformer) obj;
148         if (this.type != that.type) {
149             return false;
150         }
151         return true;
152     }
153     
154     /**
155      * Returns a clone of the transformer.
156      *
157      * @return A clone.
158      *
159      * @throws CloneNotSupportedException not thrown by this class, but
160      * subclasses (if any) might.
161      */
162     public Object JavaDoc clone() throws CloneNotSupportedException JavaDoc {
163         return super.clone();
164     }
165
166     /**
167      * Returns a hash code for this object.
168      *
169      * @return A hash code.
170      */
171     public int hashCode() {
172         return (this.type != null ? this.type.hashCode() : 0);
173     }
174     
175 }
176
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