/*
 * @(#)ZoomTransition2D.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.geom.Point2D;

/** In this 3D-ish transition the 2 frames slide forward, as if the viewer
 * is at the end of a conveyer belt. Here are playback samples:
 * <p><table summary="Sample Animations of ZoomTransition2D" cellspacing="50" border="0"><tr>
 * <td align="center">
 * <img src="https://javagraphics.java.net/resources/transition/ZoomTransition2D/ZoomLeft.gif" alt="Zoom Left">
 * <p>Zoom Left
 * </td>
 * <td align="center">
 * <img src="https://javagraphics.java.net/resources/transition/ZoomTransition2D/ZoomRight.gif" alt="Zoom Right">
 * <p>Zoom Right
 * </td>
 * <td align="center">
 * <img src="https://javagraphics.java.net/resources/transition/ZoomTransition2D/ZoomLeftStationary.gif" alt="Zoom Left Stationary">
 * <p>Zoom Left Stationary
 * </td>
 * <td align="center">
 * <img src="https://javagraphics.java.net/resources/transition/ZoomTransition2D/ZoomRightStationary.gif" alt="Zoom Right Stationary">
 * <p>Zoom Right Stationary
 * </td>
 * </tr></table>
 */
public class ZoomTransition2D extends AbstractPlanarTransition2D {

	
	/** 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 ZoomTransition2D(LEFT, false), 
				new ZoomTransition2D(LEFT, true),
				new ZoomTransition2D(RIGHT, false),
				new ZoomTransition2D(RIGHT, true)
		};
	}
	
	int multiplier;
	boolean stationary;
	
	/** Creates a zoom transition that moves to the right */
	public ZoomTransition2D() {
		this(RIGHT);
	}
	
	/** Creates a zoom transition.
	 * 
	 * @param direction move be RIGHT or LEFT.
	 */
	public ZoomTransition2D(int direction) {
		this(direction, true);
	}
	
	/** Creates a zoom transition.
	 * 
	 * @param direction move be RIGHT or MOVE_LEFT.
	 * @param stationary if true the background image stays stationary
	 */
	public ZoomTransition2D(int direction,boolean stationary) {
		this.stationary = stationary;
		if(direction==RIGHT) {
			multiplier = 1;
		} else if(direction==LEFT) {
			multiplier = -1;
		} else {
			throw new IllegalArgumentException("The direction must be LEFT or RIGHT");
		}
	}
	
	@Override
	public float getFrameBOpacity(float p) {
		if(stationary)
			return 1;
		return .5f+.5f*p;
	}
	
	@Override
	public float getFrameAOpacity(float p) {
		return 1;
	}

	@Override
	public Point2D getFrameBLocation(float p) {
		if(stationary)
			return new Point2D.Double(.5, .9999999);
		double y = p;
		double x = .5-multiplier*(1-p);
		return new Point2D.Double(x,y);
	}

	@Override
	public Point2D getFrameALocation(float p) {
		double y = p+1;
		double x = .5+multiplier*(p);
		return new Point2D.Double(x,y);
	}

	
	@Override
	public String toString() {
		if(!stationary) {
	        if(multiplier==1) {
	            return "Zoom Right";
	        } else {
	            return "Zoom Left";
	        }
		}
        if(multiplier==1) {
            return "Zoom Right Stationary";
        } else {
            return "Zoom Left Stationary";
        }
	}
}