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A GWT-compatible port of JBox2D, for use with PlayN games.
There is a newer version: 1.9.1
/*******************************************************************************
 * Copyright (c) 2011, Daniel Murphy
 * All rights reserved.
 * 
 * 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  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 DANIEL MURPHY BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
package org.jbox2d.common;

/**
 * Orientated bounding box viewport transform
 * @author Daniel Murphy
 */
public class OBBViewportTransform implements IViewportTransform{
	
	public static class OBB{
		public final Mat22 R = new Mat22();
		public final Vec2 center = new Vec2();
		public final Vec2 extents = new Vec2();
	}
	
	protected final OBB box = new OBB();
	private boolean yFlip = false;
	private final Mat22 yFlipMat = new Mat22(1,0,0,-1);
	private final Mat22 yFlipMatInv = yFlipMat.invert();
	
	public OBBViewportTransform(){
		box.R.setIdentity();
	}
	
	public void set(OBBViewportTransform vpt){
		box.center.set(vpt.box.center);
		box.extents.set( vpt.box.extents);
		box.R.set( vpt.box.R);
		yFlip = vpt.yFlip;
	}
	
	/**
	 * @see IViewportTransform#setCamera(float, float, float)
	 */
	@Override
  public void setCamera(float x, float y, float scale){
		box.center.set(x, y);
		Mat22.createScaleTransform(scale, box.R);
	}
	
	/**
	 * @see IViewportTransform#getExtents()
	 */
	@Override
  public Vec2 getExtents(){
		return box.extents;
	}
	
	/**
	 * @see IViewportTransform#setExtents(Vec2)
	 */
	@Override
  public void setExtents(Vec2 argExtents){
		box.extents.set(argExtents);
	}
	
	/**
	 * @see IViewportTransform#setExtents(float, float)
	 */
	@Override
  public void setExtents(float argHalfWidth, float argHalfHeight){
		box.extents.set(argHalfWidth, argHalfHeight);
	}
	
	/**
	 * @see IViewportTransform#getCenter()
	 */
	@Override
  public Vec2 getCenter(){
		return box.center;
	}
	
	/**
	 * @see IViewportTransform#setCenter(Vec2)
	 */
	@Override
  public void setCenter(Vec2 argPos){
		box.center.set(argPos);
	}
	
	/**
	 * @see IViewportTransform#setCenter(float, float)
	 */
	@Override
  public void setCenter(float x, float y){
		box.center.set(x,y);
	}
	
	/**
	 * gets the transform of the viewport, transforms around the center.
	 * Not a copy.
	 * @return
	 */
	public Mat22 getTransform(){
		return box.R;
	}
	
	/**
	 * Sets the transform of the viewport.  Transforms about the center.
	 * @param transform
	 */
	public void setTransform(Mat22 transform){
		box.R.set(transform);
	}
	
	/**
	 * Multiplies the obb transform by the given transform
	 * @param argTransform
	 */
	public void mulByTransform(Mat22 argTransform){
		box.R.mulLocal(argTransform);
	}
	
	/**
	 * @see IViewportTransform#isYFlip()
	 */
	@Override
  public boolean isYFlip() {
		return yFlip;
	}

	/**
	 * @see IViewportTransform#setYFlip(boolean)
	 */
	@Override
  public void setYFlip(boolean yFlip) {
		this.yFlip = yFlip;
	}

	// djm pooling
	private final Mat22 inv = new Mat22();
	/**
	 * @see IViewportTransform#getScreenVectorToWorld(Vec2, Vec2)
	 */
	@Override
  public void getScreenVectorToWorld(Vec2 argScreen, Vec2 argWorld) {
		inv.set(box.R);
		inv.invertLocal();
		inv.mulToOut(argScreen, argWorld);
		if(yFlip){
			yFlipMatInv.mulToOut( argWorld, argWorld);
		}
	}

	/**
	 * @see IViewportTransform#getWorldVectorToScreen(Vec2, Vec2)
	 */
	@Override
  public void getWorldVectorToScreen(Vec2 argWorld, Vec2 argScreen) {
		box.R.mulToOut(argWorld, argScreen);
		if(yFlip){
			yFlipMatInv.mulToOut( argScreen, argScreen);
		}
	}
	
	/**
	 * @see IViewportTransform#getWorldToScreen(Vec2, Vec2)
	 */
	@Override
  public void getWorldToScreen(Vec2 argWorld, Vec2 argScreen){
		argScreen.set(argWorld);
		argScreen.subLocal(box.center);
		box.R.mulToOut(argScreen, argScreen);
		if(yFlip){
			yFlipMat.mulToOut( argScreen, argScreen);
		}
		argScreen.addLocal(box.extents);
	}
	
	private final Mat22 inv2 = new Mat22();
	/**
	 * @see IViewportTransform#getScreenToWorld(Vec2, Vec2)
	 */
	@Override
  public void getScreenToWorld(Vec2 argScreen, Vec2 argWorld){
		argWorld.set(argScreen);
		argWorld.subLocal(box.extents);
		box.R.invertToOut(inv2);
		inv2.mulToOut(argWorld, argWorld);
		if(yFlip){
			yFlipMatInv.mulToOut( argWorld, argWorld);
		}
		argWorld.addLocal(box.center);
	}
}