/**
* Convert a position on screen to a position on the field.
*
* @param p [in, out] A reference to a FieldPoint which contains the
* position on screen. The X and Y members will be changed
* to the position on the field. This position is clamped
* so that it is always within the field's dimensions.
* @return True if the calculated position hadn't to be clamped to fit
* in the field's dimensions, false otherwise.
* @require field != null
*/
public static bool ScreenPosToFieldPos(ref FieldPoint p, Field field, uint zoomLevel) {
bool result = true;
if (p.X / zoomLevel >= field.Width) {
p.X = field.Width - 1;
result = false;
} else {
p.X /= zoomLevel;
}
if (p.Y / zoomLevel >= field.Height) {
p.Y = 0;
result = false;
} else {
p.Y = field.Height - (p.Y / zoomLevel) - 1;
}
return result;
}
/**
* Convert a point on the field to a point on screen.
*
* @require field != null
*/
public static void FieldPosToScreenPos(ref FieldPoint p, Field field, uint zoomLevel) {
p.X *= zoomLevel;
p.Y = (field.Height - p.Y - 1) * zoomLevel;
}