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Java example source code file (LineTest.java)

This example Java source code file (LineTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

line, linetest, matharithmeticexception, mathillegalargumentexception, test, vector3d

The LineTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.math3.geometry.euclidean.threed;

import org.apache.commons.math3.exception.MathArithmeticException;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.geometry.euclidean.threed.Line;
import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;
import org.apache.commons.math3.util.FastMath;
import org.junit.Assert;
import org.junit.Test;

public class LineTest {

    @Test
    public void testContains() throws MathIllegalArgumentException, MathArithmeticException {
        Vector3D p1 = new Vector3D(0, 0, 1);
        Line l = new Line(p1, new Vector3D(0, 0, 2), 1.0e-10);
        Assert.assertTrue(l.contains(p1));
        Assert.assertTrue(l.contains(new Vector3D(1.0, p1, 0.3, l.getDirection())));
        Vector3D u = l.getDirection().orthogonal();
        Vector3D v = Vector3D.crossProduct(l.getDirection(), u);
        for (double alpha = 0; alpha < 2 * FastMath.PI; alpha += 0.3) {
            Assert.assertTrue(! l.contains(p1.add(new Vector3D(FastMath.cos(alpha), u,
                                                               FastMath.sin(alpha), v))));
        }
    }

    @Test
    public void testSimilar() throws MathIllegalArgumentException, MathArithmeticException {
        Vector3D p1  = new Vector3D (1.2, 3.4, -5.8);
        Vector3D p2  = new Vector3D (3.4, -5.8, 1.2);
        Line     lA  = new Line(p1, p2, 1.0e-10);
        Line     lB  = new Line(p2, p1, 1.0e-10);
        Assert.assertTrue(lA.isSimilarTo(lB));
        Assert.assertTrue(! lA.isSimilarTo(new Line(p1, p1.add(lA.getDirection().orthogonal()), 1.0e-10)));
    }

    @Test
    public void testPointDistance() throws MathIllegalArgumentException {
        Line l = new Line(new Vector3D(0, 1, 1), new Vector3D(0, 2, 2), 1.0e-10);
        Assert.assertEquals(FastMath.sqrt(3.0 / 2.0), l.distance(new Vector3D(1, 0, 1)), 1.0e-10);
        Assert.assertEquals(0, l.distance(new Vector3D(0, -4, -4)), 1.0e-10);
    }

    @Test
    public void testLineDistance() throws MathIllegalArgumentException {
        Line l = new Line(new Vector3D(0, 1, 1), new Vector3D(0, 2, 2), 1.0e-10);
        Assert.assertEquals(1.0,
                            l.distance(new Line(new Vector3D(1, 0, 1), new Vector3D(1, 0, 2), 1.0e-10)),
                            1.0e-10);
        Assert.assertEquals(0.5,
                            l.distance(new Line(new Vector3D(-0.5, 0, 0), new Vector3D(-0.5, -1, -1), 1.0e-10)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.distance(l),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.distance(new Line(new Vector3D(0, -4, -4), new Vector3D(0, -5, -5), 1.0e-10)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.distance(new Line(new Vector3D(0, -4, -4), new Vector3D(0, -3, -4), 1.0e-10)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.distance(new Line(new Vector3D(0, -4, -4), new Vector3D(1, -4, -4), 1.0e-10)),
                            1.0e-10);
        Assert.assertEquals(FastMath.sqrt(8),
                            l.distance(new Line(new Vector3D(0, -4, 0), new Vector3D(1, -4, 0), 1.0e-10)),
                            1.0e-10);
    }

    @Test
    public void testClosest() throws MathIllegalArgumentException {
        Line l = new Line(new Vector3D(0, 1, 1), new Vector3D(0, 2, 2), 1.0e-10);
        Assert.assertEquals(0.0,
                            l.closestPoint(new Line(new Vector3D(1, 0, 1), new Vector3D(1, 0, 2), 1.0e-10)).distance(new Vector3D(0, 0, 0)),
                            1.0e-10);
        Assert.assertEquals(0.5,
                            l.closestPoint(new Line(new Vector3D(-0.5, 0, 0), new Vector3D(-0.5, -1, -1), 1.0e-10)).distance(new Vector3D(-0.5, 0, 0)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.closestPoint(l).distance(new Vector3D(0, 0, 0)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.closestPoint(new Line(new Vector3D(0, -4, -4), new Vector3D(0, -5, -5), 1.0e-10)).distance(new Vector3D(0, 0, 0)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.closestPoint(new Line(new Vector3D(0, -4, -4), new Vector3D(0, -3, -4), 1.0e-10)).distance(new Vector3D(0, -4, -4)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.closestPoint(new Line(new Vector3D(0, -4, -4), new Vector3D(1, -4, -4), 1.0e-10)).distance(new Vector3D(0, -4, -4)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.closestPoint(new Line(new Vector3D(0, -4, 0), new Vector3D(1, -4, 0), 1.0e-10)).distance(new Vector3D(0, -2, -2)),
                            1.0e-10);
    }

    @Test
    public void testIntersection() throws MathIllegalArgumentException {
        Line l = new Line(new Vector3D(0, 1, 1), new Vector3D(0, 2, 2), 1.0e-10);
        Assert.assertNull(l.intersection(new Line(new Vector3D(1, 0, 1), new Vector3D(1, 0, 2), 1.0e-10)));
        Assert.assertNull(l.intersection(new Line(new Vector3D(-0.5, 0, 0), new Vector3D(-0.5, -1, -1), 1.0e-10)));
        Assert.assertEquals(0.0,
                            l.intersection(l).distance(new Vector3D(0, 0, 0)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.intersection(new Line(new Vector3D(0, -4, -4), new Vector3D(0, -5, -5), 1.0e-10)).distance(new Vector3D(0, 0, 0)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.intersection(new Line(new Vector3D(0, -4, -4), new Vector3D(0, -3, -4), 1.0e-10)).distance(new Vector3D(0, -4, -4)),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            l.intersection(new Line(new Vector3D(0, -4, -4), new Vector3D(1, -4, -4), 1.0e-10)).distance(new Vector3D(0, -4, -4)),
                            1.0e-10);
        Assert.assertNull(l.intersection(new Line(new Vector3D(0, -4, 0), new Vector3D(1, -4, 0), 1.0e-10)));
    }

    @Test
    public void testRevert() {

        // setup
        Line line = new Line(new Vector3D(1653345.6696423641, 6170370.041579291, 90000),
                             new Vector3D(1650757.5050732433, 6160710.879908984, 0.9),
                             1.0e-10);
        Vector3D expected = line.getDirection().negate();

        // action
        Line reverted = line.revert();

        // verify
        Assert.assertArrayEquals(expected.toArray(), reverted.getDirection().toArray(), 0);

    }

}

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