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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

euclidean1d, line, linetest, mathillegalargumentexception, point, test, transform, vector1d, vector2d

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.twod;

import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.geometry.Point;
import org.apache.commons.math3.geometry.euclidean.oned.Euclidean1D;
import org.apache.commons.math3.geometry.euclidean.oned.Vector1D;
import org.apache.commons.math3.geometry.euclidean.twod.Line;
import org.apache.commons.math3.geometry.euclidean.twod.Vector2D;
import org.apache.commons.math3.geometry.partitioning.Transform;
import org.apache.commons.math3.util.FastMath;
import org.junit.Assert;
import org.junit.Test;

public class LineTest {

    @Test
    public void testContains() {
        Line l = new Line(new Vector2D(0, 1), new Vector2D(1, 2), 1.0e-10);
        Assert.assertTrue(l.contains(new Vector2D(0, 1)));
        Assert.assertTrue(l.contains(new Vector2D(1, 2)));
        Assert.assertTrue(l.contains(new Vector2D(7, 8)));
        Assert.assertTrue(! l.contains(new Vector2D(8, 7)));
    }

    @Test
    public void testAbscissa() {
        Line l = new Line(new Vector2D(2, 1), new Vector2D(-2, -2), 1.0e-10);
        Assert.assertEquals(0.0,
                            (l.toSubSpace(new Vector2D(-3,  4))).getX(),
                            1.0e-10);
        Assert.assertEquals(0.0,
                            (l.toSubSpace(new Vector2D( 3, -4))).getX(),
                            1.0e-10);
        Assert.assertEquals(-5.0,
                            (l.toSubSpace(new Vector2D( 7, -1))).getX(),
                            1.0e-10);
        Assert.assertEquals( 5.0,
                             (l.toSubSpace(new Vector2D(-1, -7))).getX(),
                             1.0e-10);
    }

    @Test
    public void testOffset() {
        Line l = new Line(new Vector2D(2, 1), new Vector2D(-2, -2), 1.0e-10);
        Assert.assertEquals(-5.0, l.getOffset(new Vector2D(5, -3)), 1.0e-10);
        Assert.assertEquals(+5.0, l.getOffset(new Vector2D(-5, 2)), 1.0e-10);
    }

    @Test
    public void testDistance() {
        Line l = new Line(new Vector2D(2, 1), new Vector2D(-2, -2), 1.0e-10);
        Assert.assertEquals(+5.0, l.distance(new Vector2D(5, -3)), 1.0e-10);
        Assert.assertEquals(+5.0, l.distance(new Vector2D(-5, 2)), 1.0e-10);
    }

    @Test
    public void testPointAt() {
        Line l = new Line(new Vector2D(2, 1), new Vector2D(-2, -2), 1.0e-10);
        for (double a = -2.0; a < 2.0; a += 0.2) {
            Point<Euclidean1D> pA = new Vector1D(a);
            Point<Euclidean2D> point = l.toSpace(pA);
            Assert.assertEquals(a, (l.toSubSpace(point)).getX(), 1.0e-10);
            Assert.assertEquals(0.0, l.getOffset(point),   1.0e-10);
            for (double o = -2.0; o < 2.0; o += 0.2) {
                point = l.getPointAt((Vector1D) pA, o);
                Assert.assertEquals(a, (l.toSubSpace(point)).getX(), 1.0e-10);
                Assert.assertEquals(o, l.getOffset(point),   1.0e-10);
            }
        }
    }

    @Test
    public void testOriginOffset() {
        Line l1 = new Line(new Vector2D(0, 1), new Vector2D(1, 2), 1.0e-10);
        Assert.assertEquals(FastMath.sqrt(0.5), l1.getOriginOffset(), 1.0e-10);
        Line l2 = new Line(new Vector2D(1, 2), new Vector2D(0, 1), 1.0e-10);
        Assert.assertEquals(-FastMath.sqrt(0.5), l2.getOriginOffset(), 1.0e-10);
    }

    @Test
    public void testParallel() {
        Line l1 = new Line(new Vector2D(0, 1), new Vector2D(1, 2), 1.0e-10);
        Line l2 = new Line(new Vector2D(2, 2), new Vector2D(3, 3), 1.0e-10);
        Assert.assertTrue(l1.isParallelTo(l2));
        Line l3 = new Line(new Vector2D(1, 0), new Vector2D(0.5, -0.5), 1.0e-10);
        Assert.assertTrue(l1.isParallelTo(l3));
        Line l4 = new Line(new Vector2D(1, 0), new Vector2D(0.5, -0.51), 1.0e-10);
        Assert.assertTrue(! l1.isParallelTo(l4));
    }

    @Test
    public void testTransform() throws MathIllegalArgumentException {

        Line l1 = new Line(new Vector2D(1.0 ,1.0), new Vector2D(4.0 ,1.0), 1.0e-10);
        Transform<Euclidean2D, Euclidean1D> t1 =
            Line.getTransform(0.0, 0.5, -1.0, 0.0, 1.0, 1.5);
        Assert.assertEquals(0.5 * FastMath.PI,
                            ((Line) t1.apply(l1)).getAngle(),
                            1.0e-10);

        Line l2 = new Line(new Vector2D(0.0, 0.0), new Vector2D(1.0, 1.0), 1.0e-10);
        Transform<Euclidean2D, Euclidean1D> t2 =
            Line.getTransform(0.0, 0.5, -1.0, 0.0, 1.0, 1.5);
        Assert.assertEquals(FastMath.atan2(1.0, -2.0),
                            ((Line) t2.apply(l2)).getAngle(),
                            1.0e-10);

    }

    @Test
    public void testIntersection() {
        Line    l1 = new Line(new Vector2D( 0, 1), new Vector2D(1, 2), 1.0e-10);
        Line    l2 = new Line(new Vector2D(-1, 2), new Vector2D(2, 1), 1.0e-10);
        Vector2D p  = l1.intersection(l2);
        Assert.assertEquals(0.5, p.getX(), 1.0e-10);
        Assert.assertEquals(1.5, p.getY(), 1.0e-10);
    }

}

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