01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This program is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * 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: private final long period;
30: private final long phase;
31:
32: /**
33: * Creates a new SineTiming.
34: * @param period the time period for a full cycle.
35: * @param phase the phase of the cycle, which is added to the actual time.
36: */
37: public SineTiming(long period, long phase) {
38: this .period = period;
39: this .phase = phase;
40: }
41:
42: // Implementation for Timing.
43:
44: public double getTiming(long time) {
45: // Compute the translated and scaled sine function.
46: return 0.5 + 0.5 * Math.sin(2.0 * Math.PI * (time + phase)
47: / period);
48: }
49: }
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