ImageViewer.java

package com.roboclub.robobuggy.ui;

import com.roboclub.robobuggy.messages.ImageMessage;
import com.roboclub.robobuggy.ros.Message;
import com.roboclub.robobuggy.ros.MessageListener;
import com.roboclub.robobuggy.ros.Subscriber;

import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

/**
 * @author Trevor Decker
 *         <p>
 *         A robobuggy gui element for viewing a stream from a camera
 */
public class ImageViewer extends RobobuggyGUIContainer {
    private BufferedImage img = null;
    private Subscriber imageSub;

    /**
     * Constructor for this object to view images
     *
     * @param topicToSub the topic that images will be published on
     */
    public ImageViewer(String topicToSub) {
        imageSub = new Subscriber("", topicToSub, new MessageListener() {

            @Override
            /**
             * @param topicName that the action occurred on
             * @param Message m that is received
             */
            public void actionPerformed(String topicName, Message m) {
                ImageMessage imgM = (ImageMessage) m;
                img = imgM.getImage();
                repaint();
            }
        });
        String path = "images/rc_logo.png";
        File file = new File(path);
        try {
            img = ImageIO.read(file);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        g.drawImage(img, 10, 10, this.getWidth() - 20, this.getHeight() - 20, Color.black, null);
        g2d.dispose();
    }


}