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Java > Open Source Codes > proguard > gui > splash > LinearColor


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.gui.splash;
22
23 import java.awt.Color JavaDoc;
24
25 /**
26  * This VariableColor varies linearly with respect to its Timing.
27  *
28  * @author Eric Lafortune
29  */
30 public class LinearColor implements VariableColor
31 {
32     private Color JavaDoc fromValue;
33     private Color JavaDoc toValue;
34     private Timing timing;
35
36     private double cachedTiming = -1.0;
37     private Color JavaDoc cachedColor;
38
39
40     /**
41      * Creates a new LinearColor.
42      * @param fromValue the value that corresponds to a timing of 0.
43      * @param toValue the value that corresponds to a timing of 1.
44      * @param timing the applied timing.
45      */
46     public LinearColor(Color JavaDoc fromValue, Color JavaDoc toValue, Timing timing)
47     {
48         this.fromValue = fromValue;
49         this.toValue = toValue;
50         this.timing = timing;
51     }
52
53
54     // Implementation for VariableColor.
55
56     public Color JavaDoc getColor(long time)
57     {
58         double t = timing.getTiming(time);
59         if (t != cachedTiming)
60         {
61             cachedTiming = t;
62             cachedColor =
63                 t == 0.0 ? fromValue :
64                 t == 1.0 ? toValue :
65                            new Color JavaDoc((int)(fromValue.getRed() + t * (toValue.getRed() - fromValue.getRed())),
66                                      (int)(fromValue.getGreen() + t * (toValue.getGreen() - fromValue.getGreen())),
67                                      (int)(fromValue.getBlue() + t * (toValue.getBlue() - fromValue.getBlue())));
68         }
69
70         return cachedColor;
71     }
72 }
73
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