001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.image.processor.connectedcomponent.render;
031
032import org.openimaj.image.Image;
033import org.openimaj.image.pixel.ConnectedComponent;
034import org.openimaj.image.pixel.Pixel;
035import org.openimaj.image.renderer.ImageRenderer;
036
037/**
038 *      A component renderer that will draw into the given image the principle
039 *      axes of the connected component. 
040 * 
041 *  @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
042 *      
043 *  @param <T> The type of image into which to draw the axes
044 */
045public class AxisRenderer<T> extends AbstractRenderer<T> 
046{
047        /** The length to draw the major axis line */
048        int majorSize = 100;
049        
050        /** The length to draw the minor axis line */
051        int minorSize = 50;
052        
053        /**
054         *      Default constructor that takes an image to draw into and a colour
055         *      in which to draw the axes.
056         * 
057         *  @param image The image to draw into
058         *  @param colour The colour to draw the axes
059         */
060        public AxisRenderer(Image<T,?> image, T colour) {
061                super(image, colour);
062        }
063        
064        /**
065         *      Constructor that creates an image of the given size and a colour
066         *      in which to draw the axes.
067         * @param width The width of the image to create
068         * @param height The height of the image to create
069         * @param colour The colour in which to draw the axes
070         */
071        public AxisRenderer(int width, int height, T colour) {
072                super(width, height, colour);
073        }
074        
075        /**
076         *      Draws the principle axes of the connected component into the image.
077         * 
078         *  {@inheritDoc}
079         *  @see org.openimaj.image.processor.connectedcomponent.ConnectedComponentProcessor#process(org.openimaj.image.pixel.ConnectedComponent)
080         */
081        @Override
082        public void process(ConnectedComponent cc) {
083                Pixel cp = cc.calculateCentroidPixel();
084                double theta = cc.calculateDirection();
085                
086                ImageRenderer<T, ?> r = image.createRenderer();
087                
088                r.drawLine(cp.x, cp.y, theta, majorSize, colour);
089                r.drawLine(cp.x, cp.y, theta, -majorSize, colour);
090                r.drawLine(cp.x, cp.y, (Math.PI/2.0)+theta, minorSize, colour);
091                r.drawLine(cp.x, cp.y, (Math.PI/2.0)+theta, -minorSize, colour);
092        }
093}