org.openimaj.demos.acmmm11.presentation.slides.SpinningImageVideo Maven / Gradle / Ivy

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The OpenIMAJ presentation for ACMMM 2011. Unlike a normal presentation, this one isn't PowerPoint, but is actually an OpenIMAJ Demo App!
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/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * 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 University of Southampton 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 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.openimaj.demos.acmmm11.presentation.slides;


import org.openimaj.image.MBFImage;
import org.openimaj.image.colour.RGBColour;
import org.openimaj.image.processing.transform.MBFProjectionProcessor;
import org.openimaj.math.geometry.transforms.TransformUtilities;
import org.openimaj.video.Video;

import Jama.Matrix;

/**
 * A video based on a still image that is animated by 
 * spinning around its centre. 
 * 
 * @author Sina Samangooei ([email protected])
 */
public class SpinningImageVideo extends Video {
	private double wh;
	private MBFImage canvas;
	private long startTime;
	private float step;
	private MBFImage image;
	private Matrix translate;
	private boolean hasNextFrame = true;
	private float start;
	private MBFImage lastFrame = null;
	private float oldStep;
	private boolean isPaused;
	
	/**
	 * Default constructor.
	 * 
	 * @param image The image to spin.
	 * @param start Starting angle.
	 * @param step Step angle between frames.
	 */
	public SpinningImageVideo(MBFImage image, float start, float step) {
		this.wh = Math.sqrt(image.getWidth()*image.getWidth() + image.getHeight() * image.getHeight());
		canvas = image.newInstance((int)wh, (int)wh);
		lastFrame = canvas;
		this.image = image;
		startTime = System.currentTimeMillis();
		this.step = step;
		this.start = start;
		
		translate = TransformUtilities.translateToPointMatrix(image.getBounds().calculateCentroid(), canvas.getBounds().calculateCentroid());
	}

	@Override
	public MBFImage getNextFrame() {
		canvas.fill(RGBColour.BLACK);
		double timePerFrame = 1000 / getFPS();
		double frame = getTimeStamp() / timePerFrame;
		double angle = start + (step * frame);
		int midx = image.getWidth()/2;
		int midy = image.getHeight()/2;
		Matrix spin = TransformUtilities.rotationMatrixAboutPoint(angle, midx, midy);
		
		MBFProjectionProcessor pp = new MBFProjectionProcessor();
		pp.setMatrix(translate.times(spin));
		pp.accumulate(image);
		pp.performProjection(0, 0, canvas);
		this.lastFrame  = canvas;
		return canvas;
	}

	@Override
	public MBFImage getCurrentFrame() {
		return lastFrame;
	}

	@Override
	public int getWidth() {
		return canvas.getWidth();
	}

	@Override
	public int getHeight() {
		return canvas.getHeight();
	}

	@Override
	public long getTimeStamp() {
		long ellapsed = System.currentTimeMillis() - startTime;
		return ellapsed;
	}

	@Override
	public double getFPS() {
		return 30;
	}

	@Override
	public boolean hasNextFrame() {
		return hasNextFrame ;
	}

	@Override
	public long countFrames() {
		return -1;
	}

	@Override
	public void reset() {
		this.startTime = System.currentTimeMillis();
	}

	/**
	 * Stop the video
	 */
	public void stop() {
		this.hasNextFrame = true;
	}

	/**
	 * Adjust the speed
	 * @param f frame rate increment
	 */
	public void adjustSpeed(float f) {
		if(isPaused) return;
		double timePerFrame = 1000 / getFPS();
		double frame = getTimeStamp() / timePerFrame;
		double angle = start + (step * frame);
		this.start = (float) angle;
		this.startTime = System.currentTimeMillis();
		this.step +=f;
	}
	
	/**
	 * Pause or unpause the video
	 */
	public void togglePause() {
		if(this.step!=0){
			this.oldStep = this.step;
			this.isPaused = true;
			double timePerFrame = 1000 / getFPS();
			double frame = getTimeStamp() / timePerFrame;
			double angle = start + (step * frame);
			this.start = (float) angle;
			this.step = 0;
			
		}
		else{
			this.isPaused = false;
			this.step = this.oldStep;
			this.startTime = System.currentTimeMillis();
		}
	}

}