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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.animation;
import gov.nasa.worldwind.util.Logging;
import java.util.Date;
/**
* @author jym
* @version $Id: ScheduledInterpolator.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class ScheduledInterpolator implements Interpolator
{
private long startTime = -1;
private final long length;
public ScheduledInterpolator(long lengthMillis)
{
this(null, lengthMillis);
}
public ScheduledInterpolator(Date startTime, long lengthMillis)
{
if (lengthMillis < 0)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", lengthMillis);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (startTime != null)
this.startTime = startTime.getTime();
this.length = lengthMillis;
}
public ScheduledInterpolator(Date startTime, Date stopTime)
{
if (startTime == null || stopTime == null)
{
String message = Logging.getMessage("nullValue.DateIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (startTime.after(stopTime))
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", startTime);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.startTime = startTime.getTime();
this.length = stopTime.getTime() - startTime.getTime();
}
public double nextInterpolant()
{
long currentTime = System.currentTimeMillis();
// When no start time is specified, begin counting time on the first run.
if (this.startTime < 0)
this.startTime = currentTime;
// Exit when current time is before starting time.
if (currentTime < this.startTime)
return 0;
long elapsedTime = currentTime - this.startTime;
double unclampedInterpolant = ((double) elapsedTime) / ((double) this.length);
return AnimationSupport.clampDouble(unclampedInterpolant, 0, 1);
}
}