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 ramps up smoothly from 0 to 1 in a given time interval.
25: *
26: * @author Eric Lafortune
27: */
28: public class SmoothTiming implements Timing {
29: private final long fromTime;
30: private final long toTime;
31:
32: /**
33: * Creates a new SmoothTiming.
34: * @param fromTime the time at which the timing starts ramping up from 0.
35: * @param toTime the time at which the timing stops ramping up at 1.
36: */
37: public SmoothTiming(long fromTime, long toTime) {
38: this .fromTime = fromTime;
39: this .toTime = toTime;
40: }
41:
42: // Implementation for Timing.
43:
44: public double getTiming(long time) {
45: if (time <= fromTime) {
46: return 0.0;
47: }
48:
49: if (time >= toTime) {
50: return 1.0;
51: }
52:
53: // Compute the linear interpolation.
54: double timing = (double) (time - fromTime)
55: / (double) (toTime - fromTime);
56:
57: // Smooth the interpolation at the ends.
58: return timing * timing * (3.0 - 2.0 * timing);
59: }
60: }
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