ContactFilter.java :  » Game » JBox2D-2.0.1 » org » jbox2d » dynamics » Java Open Source

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JBox2D 2.0.1 » org » jbox2d » dynamics » ContactFilter.java
/*
 * JBox2D - A Java Port of Erin Catto's Box2D
 * 
 * JBox2D homepage: http://jbox2d.sourceforge.net/ 
 * Box2D homepage: http://www.box2d.org
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * 
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

package org.jbox2d.dynamics;

import org.jbox2d.collision.Shape;

// Updated to rev 143 of b2WorldCallbacks.h/cpp
// See also DefaultContactFilter.java

/**
 * Implement this class to provide collision filtering. In other words, you can implement
 * this class if you want finer control over contact creation.
 */
public interface ContactFilter {
  /**
   * Default contact filter, using groupIndex, maskBits and categoryBits as detailed
   * in Box2d manual.
   */
  public static final ContactFilter DEFAULT_FILTER = new DefaultContactFilter();

  /**
   * Return true if contact calculations should be performed between these two shapes.
   * <BR><BR><em>Warning</em>: for performance reasons this is only called when the AABBs begin to overlap.
   */
  public boolean shouldCollide(Shape shape1, Shape shape2);
}
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