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Testcase for Line2D.linesIntersect


Hello!

Here's a test case for java.awt.geom.Line2D.linesIntersect()
It tests all the nasty special cases where the slope of the line
is infinity or NaN.

(Classpath fails miserably. I've got it fixed though)

/Sven

// Tags: JDK1.2

// Copyright (C) 2004 Sven de Marothy <sven@physto.se>

// This file is part of Mauve.

// Mauve is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.

// Mauve 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 General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Mauve; see the file COPYING.  If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.  */

package gnu.testlet.java.awt.geom.Line2D;

import gnu.testlet.Testlet;
import gnu.testlet.TestHarness;

import java.awt.geom.Line2D;


/**
 * Checks whether Line2D.linesIntersect works correctly
 *
 * @author Sven de Marothy
 */
public class linesIntersect
  implements Testlet
{
  public void test(TestHarness harness)
  {
      // Test 1 - a simple intersection
      harness.check(Line2D.linesIntersect(0.0, 0.0, 100.0, 50.0,
					  0.0, 50.0, 100.0, 0.0));

      // Test 2 - an orthogonal intersection
      harness.check(Line2D.linesIntersect(0.0, 0.0, 100.0, 100.0,
					  0.0, 100.0, 100.0, 0.0));

      // Test 3 - an orthogonal intersection on the axes
      harness.check(Line2D.linesIntersect(0.0, 10.0, 100.0, 10.0,
					  50.0, 0.0, 50.0, 50.0));
      
      // Test 4 - colinear overlapping lines
      harness.check(Line2D.linesIntersect(10.0, 10.0, 10.0, 90.0,
					  10.0, 0.0, 10.0, 100.0));
	
      // Test 5 - colinear nonoverlapping lines
      harness.check(!Line2D.linesIntersect(10.0, 10.0, 10.0, 90.0,
					   10.0, 91.0, 10.0, 100.0));
  }
}

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