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Java example source code file (SubLineTest.java)

This example Java source code file (SubLineTest.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

intervalsset, list, segment, subline, sublinetest, test, util, vector2d

The SubLineTest.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 java.util.List;

import org.apache.commons.math3.geometry.euclidean.oned.Euclidean1D;
import org.apache.commons.math3.geometry.euclidean.oned.IntervalsSet;
import org.apache.commons.math3.geometry.partitioning.RegionFactory;
import org.junit.Assert;
import org.junit.Test;

public class SubLineTest {

    @Test
    public void testEndPoints() {
        Vector2D p1 = new Vector2D(-1, -7);
        Vector2D p2 = new Vector2D(7, -1);
        Segment segment = new Segment(p1, p2, new Line(p1, p2, 1.0e-10));
        SubLine sub = new SubLine(segment);
        List<Segment> segments = sub.getSegments();
        Assert.assertEquals(1, segments.size());
        Assert.assertEquals(0.0, new Vector2D(-1, -7).distance(segments.get(0).getStart()), 1.0e-10);
        Assert.assertEquals(0.0, new Vector2D( 7, -1).distance(segments.get(0).getEnd()), 1.0e-10);
    }

    @Test
    public void testNoEndPoints() {
        SubLine wholeLine = new Line(new Vector2D(-1, 7), new Vector2D(7, 1), 1.0e-10).wholeHyperplane();
        List<Segment> segments = wholeLine.getSegments();
        Assert.assertEquals(1, segments.size());
        Assert.assertTrue(Double.isInfinite(segments.get(0).getStart().getX()) &&
                          segments.get(0).getStart().getX() < 0);
        Assert.assertTrue(Double.isInfinite(segments.get(0).getStart().getY()) &&
                          segments.get(0).getStart().getY() > 0);
        Assert.assertTrue(Double.isInfinite(segments.get(0).getEnd().getX()) &&
                          segments.get(0).getEnd().getX() > 0);
        Assert.assertTrue(Double.isInfinite(segments.get(0).getEnd().getY()) &&
                          segments.get(0).getEnd().getY() < 0);
    }

    @Test
    public void testNoSegments() {
        SubLine empty = new SubLine(new Line(new Vector2D(-1, -7), new Vector2D(7, -1), 1.0e-10),
                                    new RegionFactory<Euclidean1D>().getComplement(new IntervalsSet(1.0e-10)));
        List<Segment> segments = empty.getSegments();
        Assert.assertEquals(0, segments.size());
    }

    @Test
    public void testSeveralSegments() {
        SubLine twoSubs = new SubLine(new Line(new Vector2D(-1, -7), new Vector2D(7, -1), 1.0e-10),
                                    new RegionFactory<Euclidean1D>().union(new IntervalsSet(1, 2, 1.0e-10),
                                                                           new IntervalsSet(3, 4, 1.0e-10)));
        List<Segment> segments = twoSubs.getSegments();
        Assert.assertEquals(2, segments.size());
    }

    @Test
    public void testHalfInfiniteNeg() {
        SubLine empty = new SubLine(new Line(new Vector2D(-1, -7), new Vector2D(7, -1), 1.0e-10),
                                    new IntervalsSet(Double.NEGATIVE_INFINITY, 0.0, 1.0e-10));
        List<Segment> segments = empty.getSegments();
        Assert.assertEquals(1, segments.size());
        Assert.assertTrue(Double.isInfinite(segments.get(0).getStart().getX()) &&
                          segments.get(0).getStart().getX() < 0);
        Assert.assertTrue(Double.isInfinite(segments.get(0).getStart().getY()) &&
                          segments.get(0).getStart().getY() < 0);
        Assert.assertEquals(0.0, new Vector2D(3, -4).distance(segments.get(0).getEnd()), 1.0e-10);
    }

    @Test
    public void testHalfInfinitePos() {
        SubLine empty = new SubLine(new Line(new Vector2D(-1, -7), new Vector2D(7, -1), 1.0e-10),
                                    new IntervalsSet(0.0, Double.POSITIVE_INFINITY, 1.0e-10));
        List<Segment> segments = empty.getSegments();
        Assert.assertEquals(1, segments.size());
        Assert.assertEquals(0.0, new Vector2D(3, -4).distance(segments.get(0).getStart()), 1.0e-10);
        Assert.assertTrue(Double.isInfinite(segments.get(0).getEnd().getX()) &&
                          segments.get(0).getEnd().getX() > 0);
        Assert.assertTrue(Double.isInfinite(segments.get(0).getEnd().getY()) &&
                          segments.get(0).getEnd().getY() > 0);
    }

    @Test
    public void testIntersectionInsideInside() {
        SubLine sub1 = new SubLine(new Vector2D(1, 1), new Vector2D(3, 1), 1.0e-10);
        SubLine sub2 = new SubLine(new Vector2D(2, 0), new Vector2D(2, 2), 1.0e-10);
        Assert.assertEquals(0.0, new Vector2D(2, 1).distance(sub1.intersection(sub2, true)),  1.0e-12);
        Assert.assertEquals(0.0, new Vector2D(2, 1).distance(sub1.intersection(sub2, false)), 1.0e-12);
    }

    @Test
    public void testIntersectionInsideBoundary() {
        SubLine sub1 = new SubLine(new Vector2D(1, 1), new Vector2D(3, 1), 1.0e-10);
        SubLine sub2 = new SubLine(new Vector2D(2, 0), new Vector2D(2, 1), 1.0e-10);
        Assert.assertEquals(0.0, new Vector2D(2, 1).distance(sub1.intersection(sub2, true)),  1.0e-12);
        Assert.assertNull(sub1.intersection(sub2, false));
    }

    @Test
    public void testIntersectionInsideOutside() {
        SubLine sub1 = new SubLine(new Vector2D(1, 1), new Vector2D(3, 1), 1.0e-10);
        SubLine sub2 = new SubLine(new Vector2D(2, 0), new Vector2D(2, 0.5), 1.0e-10);
        Assert.assertNull(sub1.intersection(sub2, true));
        Assert.assertNull(sub1.intersection(sub2, false));
    }

    @Test
    public void testIntersectionBoundaryBoundary() {
        SubLine sub1 = new SubLine(new Vector2D(1, 1), new Vector2D(2, 1), 1.0e-10);
        SubLine sub2 = new SubLine(new Vector2D(2, 0), new Vector2D(2, 1), 1.0e-10);
        Assert.assertEquals(0.0, new Vector2D(2, 1).distance(sub1.intersection(sub2, true)),  1.0e-12);
        Assert.assertNull(sub1.intersection(sub2, false));
    }

    @Test
    public void testIntersectionBoundaryOutside() {
        SubLine sub1 = new SubLine(new Vector2D(1, 1), new Vector2D(2, 1), 1.0e-10);
        SubLine sub2 = new SubLine(new Vector2D(2, 0), new Vector2D(2, 0.5), 1.0e-10);
        Assert.assertNull(sub1.intersection(sub2, true));
        Assert.assertNull(sub1.intersection(sub2, false));
    }

    @Test
    public void testIntersectionOutsideOutside() {
        SubLine sub1 = new SubLine(new Vector2D(1, 1), new Vector2D(1.5, 1), 1.0e-10);
        SubLine sub2 = new SubLine(new Vector2D(2, 0), new Vector2D(2, 0.5), 1.0e-10);
        Assert.assertNull(sub1.intersection(sub2, true));
        Assert.assertNull(sub1.intersection(sub2, false));
    }

    @Test
    public void testIntersectionParallel() {
        final SubLine sub1 = new SubLine(new Vector2D(0, 1), new Vector2D(0, 2), 1.0e-10);
        final SubLine sub2 = new SubLine(new Vector2D(66, 3), new Vector2D(66, 4), 1.0e-10);
        Assert.assertNull(sub1.intersection(sub2, true));
        Assert.assertNull(sub1.intersection(sub2, false));
    }

}

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