/**
* Set the value of the field being animated based on the given interpolant.
* @param interpolant A value between 0 and 1.
*/
public void set(double interpolant)
{
const int MAX_SMOOTHING = 1;
const double ZOOM_START = 0.0;
const double ZOOM_STOP = 1.0;
if (interpolant >= 1.0)
{
this.stop();
}
double zoomInterpolant;
if (this.UseMidZoom)
{
double value;
zoomInterpolant = this.zoomInterpolant(interpolant, ZOOM_START, ZOOM_STOP, MAX_SMOOTHING);
if (interpolant <= .5)
{
value = nextDouble(zoomInterpolant, this.Begin, this.End);
}
else
{
value = nextDouble(zoomInterpolant, this.End, this.trueEndZoom);
}
this.propertyAccessor.setDouble(value);
}
else
{
zoomInterpolant = AnimationSupport.basicInterpolant(interpolant, ZOOM_START, ZOOM_STOP, MAX_SMOOTHING);
base.set(zoomInterpolant);
}
}
protected Position nextPosition(double interpolant)
{
const int MAX_SMOOTHING = 1;
double CENTER_START = this.useMidZoom ? 0.2 : 0.0;
double CENTER_STOP = this.useMidZoom ? 0.8 : 0.8;
double latLonInterpolant = AnimationSupport.basicInterpolant(interpolant, CENTER_START, CENTER_STOP,
MAX_SMOOTHING);
// Invoke the standard next position functionality.
Position pos = base.nextPosition(latLonInterpolant);
// Check the altitude mode. If the altitude mode depends on the surface elevation we will reevaluate the
// end position altitude. When the animation starts we may not have accurate elevation data available for
// the end position, so recalculating the elevation as we go ensures that the animation will end at the
// correct altitude.
double endElevation = 0.0;
bool overrideEndElevation = false;
if (this.altitudeMode == WorldWind.CLAMP_TO_GROUND)
{
overrideEndElevation = true;
endElevation = this.globe.getElevation(getEnd().getLatitude(), getEnd().getLongitude());
}
else if (this.altitudeMode == WorldWind.RELATIVE_TO_GROUND)
{
overrideEndElevation = true;
endElevation = this.globe.getElevation(getEnd().getLatitude(), getEnd().getLongitude())
+ getEnd().getAltitude();
}
if (overrideEndElevation)
{
LatLon ll = pos; // Use interpolated lat/lon.
double e1 = getBegin().getElevation();
pos = new Position(ll, (1 - latLonInterpolant) * e1 + latLonInterpolant * endElevation);
}
return(pos);
}