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check if point is left or right of vector Code Example
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



Cpp

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