public Position computeCenterPositionToResolveCollision(BasicOrbitView orbitView, double nearDistance,
DrawContext dc)
{
if (orbitView == null)
{
String message = Logging.getMessage("nullValue.OrbitViewIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (nearDistance < 0)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", nearDistance);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Globe globe = dc.getGlobe();
if (globe == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Position newCenter = null;
for (int i = 0; i < this.numIterations; i++)
{
Matrix modelviewInv = getModelviewInverse(globe,
newCenter != null ? newCenter : orbitView.getCenterPosition(),
orbitView.getHeading(), orbitView.getPitch(), orbitView.getRoll(), orbitView.getZoom());
if (modelviewInv != null)
{
double heightAboveSurface = computeViewHeightAboveSurface(dc, modelviewInv,
orbitView.getFieldOfView(), orbitView.getViewport(), nearDistance);
double adjustedHeight = heightAboveSurface - this.collisionThreshold;
if (adjustedHeight < 0)
{
newCenter = new Position(
newCenter != null ? newCenter : orbitView.getCenterPosition(),
(newCenter != null ? newCenter.getElevation() : orbitView.getCenterPosition().getElevation())
- adjustedHeight);
}
}
}
return(newCenter);
}
public Angle computePitchToResolveCollision(BasicOrbitView orbitView, double nearDistance, DrawContext dc)
{
if (orbitView == null)
{
String message = Logging.getMessage("nullValue.OrbitViewIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (nearDistance < 0)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", nearDistance);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Globe globe = dc.getGlobe();
if (globe == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Angle newPitch = null;
for (int i = 0; i < this.numIterations; i++)
{
Matrix modelviewInv = getModelviewInverse(globe,
orbitView.getCenterPosition(), orbitView.getHeading(),
newPitch != null ? newPitch : orbitView.getPitch(), orbitView.getRoll(),
orbitView.getZoom());
if (modelviewInv != null)
{
double heightAboveSurface = computeViewHeightAboveSurface(dc, modelviewInv,
orbitView.getFieldOfView(), orbitView.getViewport(), nearDistance);
double adjustedHeight = heightAboveSurface - this.collisionThreshold;
if (adjustedHeight < 0)
{
Vec4 eyePoint = getEyePoint(modelviewInv);
Vec4 centerPoint = globe.computePointFromPosition(orbitView.getCenterPosition());
if (eyePoint != null && centerPoint != null)
{
Position eyePos = globe.computePositionFromPoint(eyePoint);
// Compute the eye point required to resolve the collision.
Vec4 newEyePoint = globe.computePointFromPosition(eyePos.getLatitude(), eyePos.getLongitude(),
eyePos.getElevation() - adjustedHeight);
// Compute the pitch that corresponds with the elevation of the eye point
// (but not necessarily the latitude and longitude).
Vec4 normalAtCenter = globe.computeSurfaceNormalAtPoint(centerPoint);
Vec4 newEye_sub_center = newEyePoint.subtract3(centerPoint).normalize3();
double dot = normalAtCenter.dot3(newEye_sub_center);
if (dot >= -1 || dot <= 1)
{
double angle = Math.Acos(dot);
newPitch = Angle.fromRadians(angle);
}
}
}
}
}
return(newPitch);
}