protected Angle computePanHeading(OrbitView view, ScreenAnnotation control) {
// Compute last pick point 'heading' relative to pan control center
double size = control.getAttributes().getSize().width * control.getAttributes().getScale();
Vec4 center = new Vec4(control.getScreenPoint().x, control.getScreenPoint().y + size / 2, 0);
double px = lastPickPoint.x - center.x;
double py = view.getViewport().getHeight() - lastPickPoint.y - center.y;
Angle heading = view.getHeading().add(Angle.fromRadians(Math.atan2(px, py)));
heading = heading.degrees >= 0 ? heading : heading.addDegrees(360);
return heading;
}
protected Angle computeLookHeading(OrbitView view, ScreenAnnotation control, double headingStep) {
// Compute last pick point 'heading' relative to look control center on x
double size = control.getAttributes().getSize().width * control.getAttributes().getScale();
Vec4 center = new Vec4(control.getScreenPoint().x, control.getScreenPoint().y + size / 2, 0);
double px = lastPickPoint.x - center.x;
double pickDistanceFactor = Math.min(Math.abs(px) / 3000, 5) * Math.signum(px);
// New heading
Angle heading = view.getHeading().add(Angle.fromRadians(headingStep * pickDistanceFactor));
heading = heading.degrees >= 0 ? heading : heading.addDegrees(360);
return heading;
}
protected Cursor selectResizeCursor(Angle azimuth) {
while (azimuth.degrees < 0) azimuth = azimuth.addDegrees(360);
if (azimuth.degrees < 22.5) return Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR);
else if (azimuth.degrees < 67.5) return Cursor.getPredefinedCursor(Cursor.NE_RESIZE_CURSOR);
else if (azimuth.degrees < 112.5) return Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR);
else if (azimuth.degrees < 157.5) return Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR);
else if (azimuth.degrees < 202.5) return Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR);
else if (azimuth.degrees < 247.5) return Cursor.getPredefinedCursor(Cursor.SW_RESIZE_CURSOR);
else if (azimuth.degrees < 292.5) return Cursor.getPredefinedCursor(Cursor.W_RESIZE_CURSOR);
else if (azimuth.degrees < 337.5) return Cursor.getPredefinedCursor(Cursor.NW_RESIZE_CURSOR);
else // if (azimuth.degrees < 360)
return Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR);
}
/**
* 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;
}
private void recalculateVertices(Globe globe, double verticalExaggeration) {
synchronized (elevationLock) {
if (elevations != null) {
elevations.rewind();
vertices.rewind();
Angle minlon = sector.getMinLongitude();
Angle minlat = sector.getMaxLatitude();
double lonstep = sector.getDeltaLonDegrees() / (width - 1);
double latstep = sector.getDeltaLatDegrees() / (height - 1);
for (int y = 0; y < height; y++) {
Angle lat = minlat.subtractDegrees(latstep * y);
for (int x = 0; x < width; x++) {
Angle lon = minlon.addDegrees(lonstep * x);
double elev = elevations.get() * scale * verticalExaggeration;
Vec4 point = globe.computePointFromPosition(lat, lon, elev);
vertices.put(point.x).put(point.y).put(point.z);
}
}
}
}
}
