void checkTransformation(AffineTransformation trans0, AffineTransformation trans1) {
double[] m0 = trans0.getMatrixEntries();
double[] m1 = trans1.getMatrixEntries();
for (int i = 0; i < m0.length; i++) {
assertEquals(m0[i], m1[i], 0.000005);
}
}
public void testCompose2() {
AffineTransformation t0 = AffineTransformation.reflectionInstance(0, 0, 1, 0);
t0.reflect(0, 0, 0, -1);
AffineTransformation t1 = AffineTransformation.rotationInstance(Math.PI);
checkTransformation(t0, t1);
}
public void testCompose3() {
AffineTransformation t0 = AffineTransformation.reflectionInstance(0, 10, 10, 0);
t0.translate(-10, -10);
AffineTransformation t1 = AffineTransformation.reflectionInstance(0, 0, -1, 1);
checkTransformation(t0, t1);
}
public void testComposeRotation1() {
AffineTransformation t0 = AffineTransformation.rotationInstance(1, 10, 10);
AffineTransformation t1 = AffineTransformation.translationInstance(-10, -10);
t1.rotate(1);
t1.translate(10, 10);
checkTransformation(t0, t1);
}
void checkTransformation(String geomStr)
throws IOException, ParseException, NoninvertibleTransformationException {
Geometry geom = rdr.read(geomStr);
AffineTransformation trans = AffineTransformation.rotationInstance(Math.PI / 2);
AffineTransformation inv = trans.getInverse();
Geometry transGeom = (Geometry) geom.clone();
transGeom.apply(trans);
// System.out.println(transGeom);
transGeom.apply(inv);
// check if transformed geometry is equal to original
boolean isEqual = geom.equalsExact(transGeom, 0.0005);
assertTrue(isEqual);
}
public void testReflectXY2() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.reflectionInstance(1, -1);
checkTransformation(10, 0, t, 0, -10);
checkTransformation(0, 10, t, -10, 0);
checkTransformation(-10, -10, t, 10, 10);
checkTransformation(-3, -4, t, 4, 3);
}
public void testRotateAroundPoint1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.rotationInstance(Math.PI / 2, 1, 1);
checkTransformation(1, 1, t, 1, 1);
checkTransformation(10, 0, t, 2, 10);
checkTransformation(0, 10, t, -8, 0);
checkTransformation(-10, -10, t, 12, -10);
}
public void testCompose1() {
AffineTransformation t0 = AffineTransformation.translationInstance(10, 0);
t0.rotate(Math.PI / 2);
t0.translate(0, -10);
AffineTransformation t1 = AffineTransformation.translationInstance(0, 0);
t1.rotate(Math.PI / 2);
checkTransformation(t0, t1);
}
/**
* 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) {
}
}
public void testTranslateRotate1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.translationInstance(3, 3).rotate(Math.PI / 2);
checkTransformation(10, 0, t, -3, 13);
checkTransformation(-10, -10, t, 7, -7);
}
public void testTranslate1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.translationInstance(2, 3);
checkTransformation(1, 0, t, 3, 3);
checkTransformation(0, 0, t, 2, 3);
checkTransformation(-10, -5, t, -8, -2);
}
public void testShear1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.shearInstance(2, 3);
checkTransformation(10, 0, t, 10, 30);
}
public void testScale1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.scaleInstance(2, 3);
checkTransformation(10, 0, t, 20, 0);
checkTransformation(0, 10, t, 0, 30);
checkTransformation(-10, -10, t, -20, -30);
}
public void testReflectXYXY1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.reflectionInstance(0, 5, 5, 0);
checkTransformation(5, 0, t, 5, 0);
checkTransformation(0, 0, t, 5, 5);
checkTransformation(-10, -10, t, 15, 15);
}
public void testRotate1() throws IOException, ParseException {
AffineTransformation t = AffineTransformation.rotationInstance(Math.PI / 2);
checkTransformation(10, 0, t, 0, 10);
checkTransformation(0, 10, t, -10, 0);
checkTransformation(-10, -10, t, 10, -10);
}