public static final boolean isClockwise(double ox, double oy, double x1, double y1, double x2, double y2)
    {
        return isClockwise(x1-ox, y1-oy, x2-ox, y2-oy);
    }
public static final boolean isClockwise ( double ox , double oy , double x1 , double y1 , double x2 , double y2 ) { return isClockwise ( x1 - ox , y1 - oy , x2 - ox , y2 - oy ) ; }
Returns true if vector (x2, y2) is clockwise of (x1, y1) in (ox, oy) centered
coordinate.
@param ox
@param oy
@param x1
@param y1
@param x2
@param y2
@return