protected static boolean isNameVisible(
DrawContext dc, PlaceNameService service, Position namePosition) {
double elevation = dc.getVerticalExaggeration() * namePosition.getElevation();
Vec4 namePoint =
dc.getGlobe()
.computePointFromPosition(
namePosition.getLatitude(), namePosition.getLongitude(), elevation);
Vec4 eyeVec = dc.getView().getEyePoint();
double dist = eyeVec.distanceTo3(namePoint);
return dist >= service.getMinDisplayDistance() && dist <= service.getMaxDisplayDistance();
}
protected static void writeReferencePositions(String filePath, ArrayList<Position> positions)
throws FileNotFoundException {
PrintStream os = new PrintStream(new File(filePath));
for (Position pos : positions) {
os.format(
"%.5f %.5f %.4f\n",
pos.getLatitude().degrees, pos.getLongitude().degrees, pos.getElevation());
}
os.flush();
}
/**
* Compute the view range footprint on the globe.
*
* @param dc the current <code>DrawContext</code>
* @param steps the number of steps.
* @return an array list of <code>LatLon</code> forming a closed shape.
*/
protected ArrayList<LatLon> computeViewFootPrint(DrawContext dc, int steps) {
ArrayList<LatLon> positions = new ArrayList<LatLon>();
Position eyePos = dc.getView().getEyePosition();
Angle distance =
Angle.fromRadians(
Math.asin(
dc.getView().getFarClipDistance()
/ (dc.getGlobe().getRadius() + eyePos.getElevation())));
if (distance.degrees > 10) {
double headStep = 360d / steps;
Angle heading = Angle.ZERO;
for (int i = 0; i <= steps; i++) {
LatLon p = LatLon.greatCircleEndPosition(eyePos, heading, distance);
positions.add(p);
heading = heading.addDegrees(headStep);
}
return positions;
} else return null;
}