ScaleTransition2D.java

/*
 * @(#)ScaleTransition2D.java
 *
 * $Date: 2014-06-06 20:04:49 +0200 (P, 06 jún. 2014) $
 *
 * Copyright (c) 2011 by Jeremy Wood.
 * All rights reserved.
 *
 * The copyright of this software is owned by Jeremy Wood. 
 * You may not use, copy or modify this software, except in  
 * accordance with the license agreement you entered into with  
 * Jeremy Wood. For details see accompanying license terms.
 * 
 * This software is probably, but not necessarily, discussed here:
 * https://javagraphics.java.net/
 * 
 * That site should also contain the most recent official version
 * of this software.  (See the SVN repository for more details.)
 */
package com.bric.image.transition;

import java.awt.Dimension;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import com.bric.geom.RectangularTransform;

/** This zooms one frame in/out from the center. Here are playback samples:
 * <p><table summary="Sample Animations of ScaleTransition2D" cellspacing="50" border="0"><tr>
 * <td align="center">
 * <img src="https://javagraphics.java.net/resources/transition/ScaleTransition2D/ScaleIn.gif" alt="Scale In">
 * <p>Scale In
 * </td>
 * <td align="center">
 * <img src="https://javagraphics.java.net/resources/transition/ScaleTransition2D/ScaleOut.gif" alt="Scale Out">
 * <p>Scale Out
 * </td>
 * </tr></table>
 *
 */
public class ScaleTransition2D extends Transition2D {
	
	/** This public static method is used by the 
	 * {@link com.bric.image.transition.Transition2DDemoHelper}
	 * class to create sample animations of this transition.
	 * @return the transitions that should be used to demonstrate this
	 * transition.
	 */
	public static Transition[] getDemoTransitions() {
		return new Transition[] {
				new ScaleTransition2D(IN), 
				new ScaleTransition2D(OUT)
		};
	}
	
	int type;

	/** Creates a new ScaleTransition2D that scales out */
	public ScaleTransition2D() {
		this(OUT);
	}
	
	/** Creates a new ScaleTransition2D
	 * 
	 * @param type must be IN or OUT
	 */
	public ScaleTransition2D(int type) {
		if(!(type==IN || type==OUT))
			throw new IllegalArgumentException("type must be IN or OUT");
		this.type = type;
	}

	@Override
	public Transition2DInstruction[] getInstructions(float progress,
			Dimension size) {
		Point2D center = new Point2D.Float(size.width/2f, size.height/2f);
		
		AffineTransform transform;
		if(type==OUT) {
			progress = 1-progress;
		}
		
		float w = size.width*progress;
		float h = size.height*progress;
		transform = RectangularTransform.create(
				new Rectangle2D.Float(0,0,size.width,size.height),
				new Rectangle2D.Double(center.getX()-w/2,center.getY()-h/2,w,h));

		return new ImageInstruction[] {
				new ImageInstruction(type==IN),
				new ImageInstruction(type!=IN,transform,null)
		};
	}

	@Override
	public String toString() {
		if(type==IN) {
			return "Scale In";
		} else {
			return "Scale Out";
		}
	}
}