1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2009 Eric Lafortune (eric (at) 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 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 { 30 private final long fromTime; 31 private final long toTime; 32 33 34 /** 35 * Creates a new SmoothTiming. 36 * @param fromTime the time at which the timing starts ramping up from 0. 37 * @param toTime the time at which the timing stops ramping up at 1. 38 */ 39 public SmoothTiming(long fromTime, long toTime) 40 { 41 this.fromTime = fromTime; 42 this.toTime = toTime; 43 } 44 45 46 // Implementation for Timing. 47 48 public double getTiming(long time) 49 { 50 if (time <= fromTime) 51 { 52 return 0.0; 53 } 54 55 if (time >= toTime) 56 { 57 return 1.0; 58 } 59 60 // Compute the linear interpolation. 61 double timing = (double) (time - fromTime) / (double) (toTime - fromTime); 62 63 // Smooth the interpolation at the ends. 64 return timing * timing * (3.0 - 2.0 * timing); 65 } 66 } 67
