/C++/Check if point is left or right of vector

Check if point is left or right of vector

Check position of point M(X, Y) relative to vector AB with points A(Ax, Ay) and B(Bx, By):

position = sign((Bx - Ax) * (Y - Ay) - (By - Ay) * (X - Ax))

M is: 	+1 left,
		-1 right,
    	0 on the vector AB

Source: stackoverflow.com

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