/**
* Computes the value for the given interpolant.
*
* @param interpolant the interpolant to use for interpolating
* @param start the lower end of the interpolated range.
* @param end the upper end of the interpolated range.
* @return the interpolated value.
*/
protected double nextDouble(double interpolant, double start, double end)
{
double elevation = AnimationSupport.mixDouble(
interpolant,
start,
end);
// 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.globe != null && this.altitudeMode == WorldWind.CLAMP_TO_GROUND)
{
overrideEndElevation = true;
endElevation = this.globe.getElevation(endLatLon.getLatitude(), endLatLon.getLongitude());
}
else if (this.globe != null && this.altitudeMode == WorldWind.RELATIVE_TO_GROUND)
{
overrideEndElevation = true;
endElevation = this.globe.getElevation(endLatLon.getLatitude(), endLatLon.getLongitude()) + end;
}
if (overrideEndElevation)
{
elevation = (1 - interpolant) * start + interpolant * endElevation;
}
return(elevation);
}
protected static double computeMidZoom(
Globe globe,
LatLon beginLatLon, LatLon endLatLon,
double beginZoom, double endZoom)
{
// Scale factor is angular distance over 180 degrees.
Angle sphericalDistance = LatLon.greatCircleDistance(beginLatLon, endLatLon);
double scaleFactor = AnimationSupport.angularRatio(sphericalDistance, Angle.POS180);
// Mid-point zoom is interpolated value between minimum and maximum zoom.
double MIN_ZOOM = Math.Min(beginZoom, endZoom);
double MAX_ZOOM = 3.0 * globe.getRadius();
return(AnimationSupport.mixDouble(scaleFactor, MIN_ZOOM, MAX_ZOOM));
}