PlaneConstraints.java

/**
 * Copyright (c) 2003-2009, Xith3D Project Group all rights reserved.
 * 
 * Portions based on the Java3D interface, Copyright by Sun Microsystems.
 * Many thanks to the developers of Java3D and Sun Microsystems for their
 * innovation and design.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the 'Xith3D Project Group' nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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package org.xith3d.selection;

import org.openmali.spatial.bodies.Plane;
import org.openmali.vecmath2.Point3f;
import org.openmali.vecmath2.Tuple3f;
import org.openmali.vecmath2.Vector3f;
import org.xith3d.picking.PickPool;
import org.xith3d.picking.PickRay;
import org.xith3d.render.Canvas3D;
import org.xith3d.render.RenderPassConfig;

/**
 * @author Mathias Henze (aka cylab)
 */
public class PlaneConstraints implements MovementConstraints
{
    private Vector3f planeNormal;
    
    public Vector3f getPlaneNormal()
    {
        return ( planeNormal );
    }
    
    public void setPlaneNormal( Vector3f planeNormal )
    {
        this.planeNormal = planeNormal;
    }
        
    public void computeNewPosition( RenderPassConfig rpc, Canvas3D canvas, int x, int y, Point3f p0, Point3f newPosition )
    {
        Tuple3f n = planeNormal;
        
        Plane movementPlane = Plane.fromPool();
        PickRay pickRay = PickPool.allocatePickRay();
        
        float d = -( n.getX() * p0.getX() + n.getY() * p0.getY() + n.getZ() * p0.getZ() );
        movementPlane.set( n.getX(), n.getY(), n.getZ(), d );
        pickRay.recalculate( rpc, canvas, x, y );
        movementPlane.intersects( pickRay, newPosition );
        
        PickPool.deallocatePickRay( pickRay );
        Plane.toPool( movementPlane );
    }
    
    public PlaneConstraints( Vector3f planeNormal )
    {
        this.planeNormal = planeNormal;
    }
    
    public PlaneConstraints()
    {
        this( Vector3f.POSITIVE_Z_AXIS );
    }
}