src.gov.nasa.worldwind.animation.MoveToPositionAnimator Maven / Gradle / Ivy
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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.geom.*;
import gov.nasa.worldwind.util.*;
/**
* @author jym
* @version $Id: MoveToPositionAnimator.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class MoveToPositionAnimator extends PositionAnimator
{
protected double positionMinEpsilon = 1e-9;
protected double smoothing = .9;
protected boolean useSmoothing = true;
public MoveToPositionAnimator(
Position begin,
Position end,
double smoothing,
PropertyAccessor.PositionAccessor propertyAccessor)
{
super(null, begin, end, propertyAccessor);
this.interpolator = null;
this.smoothing = smoothing;
}
public void next()
{
if (hasNext())
set(1.0-smoothing);
}
public Position nextPosition(double interpolant)
{
Position nextPosition = this.end;
Position curCenter = this.propertyAccessor.getPosition();
double latlonDifference = LatLon.greatCircleDistance(nextPosition, curCenter).degrees;
double elevDifference = Math.abs(nextPosition.getElevation() - curCenter.getElevation());
boolean stopMoving = Math.max(latlonDifference, elevDifference) < this.positionMinEpsilon;
if (!stopMoving)
{
interpolant = 1 - this.smoothing;
nextPosition = new Position(
Angle.mix(interpolant, curCenter.getLatitude(), this.end.getLatitude()),
Angle.mix(interpolant, curCenter.getLongitude(), this.end.getLongitude()),
(1 - interpolant) * curCenter.getElevation() + interpolant * this.end.getElevation());
}
// If target is close, cancel future value changes.
if (stopMoving)
{
this.stop();
return(null);
}
return nextPosition;
}
}