PolylineTest.java

/*******************************************************************************
 * Copyright 2010 Simon Mieth
 * 
 * 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 org.kabeja.entities;

import org.junit.Test;
import static org.junit.Assert.*;

import org.kabeja.entities.Polyline;
import org.kabeja.entities.Vertex;
import org.kabeja.math.Bounds;
import org.kabeja.math.Point3D;

public class PolylineTest {

    public static final double DELTA = 1.0E-7;

    @Test
    public void bounds() {
        Polyline pl = new Polyline();
        pl.addVertex(new Vertex());
        pl.addVertex(new Vertex(new Point3D(100, 100, 0)));

        Bounds b = pl.getBounds();
        assertEquals(100, b.getWidth(), 0.0);
        assertEquals(100, b.getHeight(), 0.0);
    }

    @Test
    public void bulgedBoundsEqualsNegativeRadius() {
        Polyline pl = new Polyline();
        Vertex v = new Vertex(new Point3D(0, 0, 0));
        v.setBulge(1.0);
        pl.addVertex(v);

        Vertex v2 = new Vertex(new Point3D(100, 0.0, 0));
        pl.addVertex(v2);

        Bounds b = pl.getBounds();

        assertEquals(100, b.getWidth(), DELTA);
        assertEquals(50, b.getHeight(), DELTA);
        assertEquals(0, b.getMaximumY(), DELTA);
        assertEquals(-50, b.getMinimumY(), DELTA);
    }

    @Test
    public void bulgedBoundsEqualsPositiveRadius() {
        Polyline pl = new Polyline();
        Vertex v = new Vertex(new Point3D(0, 0, 0));
        v.setBulge(-1.0);
        pl.addVertex(v);

        Vertex v2 = new Vertex(new Point3D(100, 0.0, 0));
        pl.addVertex(v2);

        Bounds b = pl.getBounds();

        assertEquals(100, b.getWidth(), DELTA);
        assertEquals(50, b.getHeight(), DELTA);
        assertEquals(50, b.getMaximumY(), DELTA);
        assertEquals(0, b.getMinimumY(), DELTA);
    }

    @Test
    public void bulgedBoundsLowerPositiveRadius() {
        Polyline pl = new Polyline();
        Vertex v = new Vertex(new Point3D(0, 0, 0));
        v.setBulge(-.5);
        pl.addVertex(v);

        Vertex v2 = new Vertex(new Point3D(100, 0.0, 0));
        pl.addVertex(v2);

        Bounds b = pl.getBounds();

        assertEquals(100, b.getWidth(), DELTA);
        assertEquals(25, b.getHeight(), DELTA);
        assertEquals(25, b.getMaximumY(), DELTA);
        assertEquals(0, b.getMinimumY(), DELTA);
    }

    @Test
    public void bulgedBoundsLowerNegativeRadius() {
        Polyline pl = new Polyline();
        Vertex v = new Vertex(new Point3D(0, 0, 0));
        v.setBulge(.5);
        pl.addVertex(v);

        Vertex v2 = new Vertex(new Point3D(100, 0.0, 0));
        pl.addVertex(v2);

        Bounds b = pl.getBounds();

        assertEquals(100, b.getWidth(), DELTA);
        assertEquals(25, b.getHeight(), DELTA);
        assertEquals(0, b.getMaximumY(), DELTA);
        assertEquals(-25, b.getMinimumY(), DELTA);
    }

    @Test
    public void bulgedBoundsGreaterPositiveRadius() {
        Polyline pl = new Polyline();
        Vertex v = new Vertex(new Point3D(0, 0, 0));
        v.setBulge(-2.0);
        pl.addVertex(v);

        Vertex v2 = new Vertex(new Point3D(100, 0.0, 0));
        pl.addVertex(v2);

        Bounds b = pl.getBounds();

        double r = 100 / (2 * Math.sin(((4 * Math.atan(v.getBulge())) / 2)));
        r = Math.abs(r);
        assertEquals(2 * r, b.getWidth(), DELTA);
        assertEquals(100, b.getHeight(), DELTA);
        assertEquals(100, b.getMaximumY(), DELTA);
        assertEquals(0, b.getMinimumY(), DELTA);
    }

    @Test
    public void bulgedBoundsGreaterNegativeRadius() {
        Polyline pl = new Polyline();
        Vertex v = new Vertex(new Point3D(0, 0, 0));
        v.setBulge(2.0);
        pl.addVertex(v);

        Vertex v2 = new Vertex(new Point3D(100, 0.0, 0));
        pl.addVertex(v2);

        Bounds b = pl.getBounds();

        double r = 100 / (2 * Math.sin(((4 * Math.atan(v.getBulge())) / 2)));
        r = Math.abs(r);
        assertEquals(2 * r, b.getWidth(), DELTA);
        assertEquals(100, b.getHeight(), DELTA);
        assertEquals(0, b.getMaximumY(), DELTA);
        assertEquals(-100, b.getMinimumY(), DELTA);
    }
}