/**
* Checks that a transformation produces the expected result
*
* @param x the input pt x
* @param y the input pt y
* @param trans the transformation
* @param xp the expected output x
* @param yp the expected output y
*/
void checkTransformation(double x, double y, AffineTransformation trans, double xp, double yp) {
Coordinate p = new Coordinate(x, y);
Coordinate p2 = new Coordinate();
trans.transform(p, p2);
assertEquals(xp, p2.x, .00005);
assertEquals(yp, p2.y, .00005);
// if the transformation is invertible, test the inverse
try {
AffineTransformation invTrans = trans.getInverse();
Coordinate pInv = new Coordinate();
invTrans.transform(p2, pInv);
assertEquals(x, pInv.x, .00005);
assertEquals(y, pInv.y, .00005);
double det = trans.getDeterminant();
double detInv = invTrans.getDeterminant();
assertEquals(det, 1.0 / detInv, .00005);
} catch (NoninvertibleTransformationException ex) {
}
}
