proguard.gui.splash.SmoothTiming Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.gui.splash;
/**
* This Timing ramps up smoothly from 0 to 1 in a given time interval.
*
* @author Eric Lafortune
*/
public class SmoothTiming implements Timing
{
private final long fromTime;
private final long toTime;
/**
* Creates a new SmoothTiming.
* @param fromTime the time at which the timing starts ramping up from 0.
* @param toTime the time at which the timing stops ramping up at 1.
*/
public SmoothTiming(long fromTime, long toTime)
{
this.fromTime = fromTime;
this.toTime = toTime;
}
// Implementation for Timing.
public double getTiming(long time)
{
if (time <= fromTime)
{
return 0.0;
}
if (time >= toTime)
{
return 1.0;
}
// Compute the linear interpolation.
double timing = (double) (time - fromTime) / (double) (toTime - fromTime);
// Smooth the interpolation at the ends.
return timing * timing * (3.0 - 2.0 * timing);
}
}