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


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 /**
24  * This Timing varies between 0 and 1, as a sine wave over time.
25  *
26  * @author Eric Lafortune
27  */

28 public class SineTiming implements Timing
29 {
30     private long period;
31     private long phase;
32
33
34     /**
35      * Creates a new SineTiming.
36      * @param period the time period for a full cycle.
37      * @param phase the phase of the cycle, which is added to the actual time.
38      */

39     public SineTiming(long period, long phase)
40     {
41         this.period = period;
42         this.phase = phase;
43     }
44
45
46     // Implementation for Timing.
47

48     public double getTiming(long time)
49     {
50         // Compute the translated and scaled sine function.
51
return 0.5 + 0.5 * Math.sin(2.0 * Math.PI * (time + phase) / period);
52     }
53 }
54
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