signOfDet2x2 static method
Computes the sign of the determinant of the 2x2 matrix with the given entries.
@return -1 if the determinant is negative, @return 1 if the determinant is positive, @return 0 if the determinant is 0.
Implementation
static int signOfDet2x2(double dx1, double dy1, double dx2, double dy2) {
DD x1 = DD.valueOf(dx1);
DD y1 = DD.valueOf(dy1);
DD x2 = DD.valueOf(dx2);
DD y2 = DD.valueOf(dy2);
DD det = x1.multiplyDD(y2).selfSubtractDD(y1.multiplyDD(x2));
return det.signum();
}