/*
 * Moonlight|3D Copyright (C) 2005 The Moonlight|3D team
 * 
 * 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
 * 
 * Created on Feb 16, 2005
 */
package ml.test;

import junit.framework.TestCase;
import ml.math.Plane;
import ml.math.Ray;
import ml.math.Vector3D;

/**
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 *
 * @author gregor
 */
public class PlaneTest extends TestCase {

    public static void main(String[] args)
    {
        junit.awtui.TestRunner.run(PlaneTest.class);
    }

    public void testFromPointAndVectors()
    {
        Vector3D point=new Vector3D();
        Vector3D a=new Vector3D();
        Vector3D b=new Vector3D();
        Vector3D normal=new Vector3D();
        
        point.X1=0.0; point.X2=1.0; point.X3=0.0;
        a.X1=1.0; a.X2=0.0; a.X3=0.0;
        b.X1=0.0; b.X2=0.0; b.X3=1.0;
        
        Plane p=new Plane();
        
        p.fromPointAndVectors(point,a,b);
        
        normal.X1=0.0; normal.X2=-1.0; normal.X3=0.0;
        
        assertTrue(normal.equals(p.normal));
        assertTrue(p.distance==1.0);
    }

    public void testFromPoints()
    {
        Vector3D point1=new Vector3D();
        Vector3D point2=new Vector3D();
        Vector3D point3=new Vector3D();
        Vector3D normal=new Vector3D();
        
        point1.X1=0.0; point1.X2=1.0; point1.X3=0.0;
        point2.X1=1.0; point2.X2=1.0; point2.X3=0.0;
        point3.X1=0.0; point3.X2=1.0; point3.X3=1.0;
        
        Plane p=new Plane();
        
        p.fromPoints(point1,point2,point3);
        
        normal.X1=0.0; normal.X2=-1.0; normal.X3=0.0;
        
        assertTrue(normal.equals(p.normal));
        assertTrue(p.distance==1.0);
    }

    public void testGetIntersectionPoint()
    {
        Vector3D point1=new Vector3D();
        Vector3D point2=new Vector3D();
        Vector3D point3=new Vector3D();
        Ray ray=new Ray();
        
        // make plane parallel to xz-plane
        point1.X1=0.0; point1.X2=1.0; point1.X3=0.0;
        point2.X1=1.0; point2.X2=1.0; point2.X3=0.0;
        point3.X1=0.0; point3.X2=1.0; point3.X3=1.0;
        
        Plane p=new Plane();
        
        p.fromPoints(point1,point2,point3);
        
        ray.start.X1=0.0; ray.start.X2=0.0; ray.start.X3=0.0;
        ray.direction.X1=0.0; ray.direction.X2=1.0; ray.direction.X3=0.0;
        
        Vector3D intersection=p.getIntersectionPoint(ray);
        assertFalse(intersection==null);
        if(intersection!=null) {
            Vector3D result=new Vector3D();
            result.X1=0.0; result.X2=1.0; result.X3=0.0;
            assertTrue(intersection.equals(result));
        }

        // change plane to be at a 45-degree angle
        point1.X1=0.0; point1.X2=1.0; point1.X3=0.0;
        point2.X1=1.0; point2.X2=1.0; point2.X3=0.0;
        point3.X1=0.0; point3.X2=2.0; point3.X3=1.0;
        
        p.fromPoints(point1,point2,point3);
        
        // move ray start point off center
        ray.start.X1=0.0; ray.start.X2=0.0; ray.start.X3=1.0;
        ray.direction.X1=0.0; ray.direction.X2=1.0; ray.direction.X3=0.0;

        // test again
        intersection=p.getIntersectionPoint(ray);
        assertFalse(intersection==null);
        if(intersection!=null) {
            Vector3D result=new Vector3D();
            result.X1=0.0; result.X2=2.0; result.X3=1.0;
            assertTrue(intersection.equals(result));
        }
    }
}