@Test public void testComputeRotationAngle() { IPoint pt1 = ShapeFactory.createPoint(); assertEquals(Double.NaN, pt1.computeRotationAngle(null, null), 0.1); assertEquals(Double.NaN, pt1.computeRotationAngle(ShapeFactory.createPoint(), null), 0.1); assertEquals(Double.NaN, pt1.computeRotationAngle(null, ShapeFactory.createPoint()), 0.1); assertEquals( 0., pt1.computeRotationAngle(ShapeFactory.createPoint(1, 0), ShapeFactory.createPoint(1, 0)), 0.1); assertEquals( 0., pt1.computeRotationAngle(ShapeFactory.createPoint(0, 1), ShapeFactory.createPoint(0, 1)), 0.1); assertEquals( 0., pt1.computeRotationAngle(ShapeFactory.createPoint(-1, 0), ShapeFactory.createPoint(-1, 0)), 0.1); assertEquals( 0., pt1.computeRotationAngle(ShapeFactory.createPoint(0, -1), ShapeFactory.createPoint(0, -1)), 0.1); assertEquals( Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(1, 0), ShapeFactory.createPoint(0, 1)), 0.1); assertEquals( Math.PI, Math.abs( pt1.computeRotationAngle( ShapeFactory.createPoint(1, 0), ShapeFactory.createPoint(-1, 0))), 0.1); assertEquals( 3. * Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(1, 0), ShapeFactory.createPoint(0, -1)), 0.1); assertEquals( Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(0, 1), ShapeFactory.createPoint(-1, 0)), 0.1); assertEquals( Math.PI, Math.abs( pt1.computeRotationAngle( ShapeFactory.createPoint(0, 1), ShapeFactory.createPoint(0, -1))), 0.1); assertEquals( -Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(0, 1), ShapeFactory.createPoint(1, 0)), 0.1); assertEquals( Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(-1, 0), ShapeFactory.createPoint(0, -1)), 0.1); assertEquals( Math.PI, Math.abs( pt1.computeRotationAngle( ShapeFactory.createPoint(-1, 0), ShapeFactory.createPoint(1, 0))), 0.1); assertEquals( -Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(-1, 0), ShapeFactory.createPoint(0, 1)), 0.1); assertEquals( -3. * Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(0, -1), ShapeFactory.createPoint(1, 0)), 0.1); assertEquals( Math.PI, Math.abs( pt1.computeRotationAngle( ShapeFactory.createPoint(0, -1), ShapeFactory.createPoint(0, 1))), 0.1); assertEquals( -Math.PI / 2., pt1.computeRotationAngle(ShapeFactory.createPoint(0, -1), ShapeFactory.createPoint(-1, 0)), 0.1); }