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      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