Perform the Counter-ClockWise parameter between 3 points.
[C] = NL_V_CCW(X1,Y1,X2,Y2,X3,Y3)
X-coordinate of the first point.
Y-coordinate of the first point.
X-coordinate of the second point.
Y-coordinate of the second point.
X-coordinate of the third point.
Y-coordinate of the third point.
Counter-ClockWise.
NL_V_CCW performs the Counter-ClockWise C parameter between the 3 points of coordinates (X1,Y1), (X2,Y2) and (X3,Y3). Three points are a counter-clockwise turn if C > 0, clockwise if C < 0 and collinear if C = 0.