Function IsInsideRotatedRectangle

src/viewport.cpp:801–810

* Checks whether a point is inside the selected a diagonal rectangle given by _thd.size and _thd.pos * @param x The x coordinate of the point to be checked. * @param y The y coordinate of the point to be checked. * @return True if the point is inside the rectangle, else false. */

 * @return True if the point is inside the rectangle, else false.
 */
bool IsInsideRotatedRectangle(int x, int y)
{
	int dist_a = (_thd.size.x + _thd.size.y);      // Rotated coordinate system for selected rectangle.
	int dist_b = (_thd.size.x - _thd.size.y);      // We don't have to divide by 2. It's all relative!
	int a = ((x - _thd.pos.x) + (y - _thd.pos.y)); // Rotated coordinate system for the point under scrutiny.
	int b = ((x - _thd.pos.x) - (y - _thd.pos.y));

	/* Check if a and b are between 0 and dist_a or dist_b respectively. */
	return IsInRangeInclusive(dist_a, 0, a) && IsInRangeInclusive(dist_b, 0, b);
}

/**
 * Add a child sprite to a parent sprite.