/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2014, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -----------------------
* LineUtilitiesTests.java
* -----------------------
* (C) Copyright 2008, 2014, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 05-Nov-2008 : Version 1 (DG);
*
*/
package org.jfree.chart.util;
import org.junit.Test;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
/**
* Tests for the {@link LineUtilities} class.
*/
public class LineUtilsTest {
private boolean lineEquals(Line2D line, double x1, double y1, double x2,
double y2) {
boolean result = true;
double epsilon = 0.0000000001;
if (Math.abs(line.getX1() - x1) > epsilon) { result = false; }
if (Math.abs(line.getY1() - y1) > epsilon) { result = false; }
if (Math.abs(line.getX2() - x2) > epsilon) { result = false; }
if (Math.abs(line.getY2() - y2) > epsilon) { result = false; }
return result;
}
@Test
public void testClipLine() {
Rectangle2D rect = new Rectangle2D.Double(1.0, 1.0, 1.0, 1.0);
Line2D line = new Line2D.Double();
assertFalse(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 0.0, 0.0, 0.0, 0.0));
line.setLine(0.5, 0.5, 0.6, 0.6);
assertFalse(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 0.5, 0.5, 0.6, 0.6));
line.setLine(0.5, 0.5, 1.6, 0.6);
assertFalse(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 0.5, 0.5, 1.6, 0.6));
line.setLine(0.5, 0.5, 2.6, 0.6);
assertFalse(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 0.5, 0.5, 2.6, 0.6));
line.setLine(0.5, 0.5, 0.6, 1.6);
assertFalse(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 0.5, 0.5, 0.6, 1.6));
line.setLine(0.5, 0.5, 1.6, 1.6);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 1.0, 1.0, 1.6, 1.6));
line.setLine(0.5, 0.5, 2.6, 1.6);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 1.4545454545454546, 1.0, 2.0,
1.2857142857142858));
line.setLine(0.5, 0.5, 0.5, 2.6);
assertFalse(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 0.5, 0.5, 0.5, 2.6));
line.setLine(0.5, 0.5, 1.5, 2.6);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 1.0, 1.55, 1.2142857142857142, 2.0));
line.setLine(0.5, 0.5, 2.5, 2.6);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 1.0, 1.025, 1.9285714285714284, 2.0));
line.setLine(0.5, 0.5, 1.5, 1.5);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 1.0, 1.0, 1.5, 1.5));
line.setLine(2.5, 1.0, 1.5, 1.5);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 2.0, 1.25, 1.5, 1.5));
line.setLine(1.5, 1.5, 2.5, 1.0);
assertTrue(LineUtils.clipLine(line, rect));
assertTrue(lineEquals(line, 1.5, 1.5, 2.0, 1.25));
}
}