protected Angle computeIconRadius(DrawContext dc, double regionPixelSize, Sector drawSector) {
double minCosLat =
Math.min(drawSector.getMinLatitude().cos(), drawSector.getMaxLatitude().cos());
if (minCosLat < 0.001) return Angle.POS180;
Rectangle2D iconDimension = this.computeDrawDimension(regionPixelSize); // Meter
double dLat = iconDimension.getHeight() / dc.getGlobe().getRadius();
double dLon = iconDimension.getWidth() / dc.getGlobe().getRadius() / minCosLat;
return Angle.fromRadians(Math.sqrt(dLat * dLat + dLon * dLon) / 2);
}
/**
* Compute the amount of rotation to apply to a label in order to keep it oriented toward its
* orientation position.
*
* @param screenPoint Geographic position of the text, projected onto the screen.
* @param orientationScreenPoint Orientation position, projected onto the screen.
* @return The rotation angle to apply when drawing the label.
*/
protected Angle computeRotation(Vec4 screenPoint, Vec4 orientationScreenPoint) {
// Determine delta between the orientation position and the label position
double deltaX = screenPoint.x - orientationScreenPoint.x;
double deltaY = screenPoint.y - orientationScreenPoint.y;
if (deltaX != 0) {
double angle = Math.atan(deltaY / deltaX);
return Angle.fromRadians(angle);
} else {
return Angle.POS90; // Vertical label
}
}
protected Angle computeSectorRadius(Sector sector) {
double dLat = sector.getDeltaLatRadians();
double dLon = sector.getDeltaLonRadians();
return Angle.fromRadians(Math.sqrt(dLat * dLat + dLon * dLon) / 2);
}