/*
* Copyright 2007 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ntu.com.google.zxing.common;
import org.junit.Assert;
import org.junit.Test;
/**
* @author Sean Owen
*/
public final class PerspectiveTransformTestCase extends Assert {
private static final float EPSILON = 0.0001f;
@Test
public void testSquareToQuadrilateral() {
PerspectiveTransform pt = PerspectiveTransform.squareToQuadrilateral(
2.0f, 3.0f, 10.0f, 4.0f, 16.0f, 15.0f, 4.0f, 9.0f);
assertPointEquals(2.0f, 3.0f, 0.0f, 0.0f, pt);
assertPointEquals(10.0f, 4.0f, 1.0f, 0.0f, pt);
assertPointEquals(4.0f, 9.0f, 0.0f, 1.0f, pt);
assertPointEquals(16.0f, 15.0f, 1.0f, 1.0f, pt);
assertPointEquals(6.535211f, 6.8873234f, 0.5f, 0.5f, pt);
assertPointEquals(48.0f, 42.42857f, 1.5f, 1.5f, pt);
}
@Test
public void testQuadrilateralToQuadrilateral() {
PerspectiveTransform pt = PerspectiveTransform.quadrilateralToQuadrilateral(
2.0f, 3.0f, 10.0f, 4.0f, 16.0f, 15.0f, 4.0f, 9.0f,
103.0f, 110.0f, 300.0f, 120.0f, 290.0f, 270.0f, 150.0f, 280.0f);
assertPointEquals(103.0f, 110.0f, 2.0f, 3.0f, pt);
assertPointEquals(300.0f, 120.0f, 10.0f, 4.0f, pt);
assertPointEquals(290.0f, 270.0f, 16.0f, 15.0f, pt);
assertPointEquals(150.0f, 280.0f, 4.0f, 9.0f, pt);
assertPointEquals(7.1516876f, -64.60185f, 0.5f, 0.5f, pt);
assertPointEquals(328.09116f, 334.16385f, 50.0f, 50.0f, pt);
}
private static void assertPointEquals(float expectedX,
float expectedY,
float sourceX,
float sourceY,
PerspectiveTransform pt) {
float[] points = {sourceX, sourceY};
pt.transformPoints(points);
assertEquals(expectedX, points[0], EPSILON);
assertEquals(expectedY, points[1], EPSILON);
}
}