ImageReadTest.java

package org.newdawn.slick.tests;

import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.Color;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Image;
import org.newdawn.slick.SlickException;

/**
 * A test for reading image data from a teture
 *
 * @author kevin
 */
public class ImageReadTest extends BasicGame {
	/** The image loaded to be read */
	private Image image;
	/** The four pixels read */
	private Color[] read = new Color[6];
	/** The main graphics context */
	private Graphics g;
	
	/**
	 * Create a new image reading test
	 */
	public ImageReadTest() {
		super("Image Read Test");
	}
	
	/**
	 * @see org.newdawn.slick.BasicGame#init(org.newdawn.slick.GameContainer)
	 */
	public void init(GameContainer container) throws SlickException {
		image = new Image("testdata/testcard.png");
		read[0] = image.getColor(0, 0);
		read[1] = image.getColor(30, 40);
		read[2] = image.getColor(55, 70);
		read[3] = image.getColor(80, 90);
	}

	/**
	 * @see org.newdawn.slick.BasicGame#render(org.newdawn.slick.GameContainer, org.newdawn.slick.Graphics)
	 */
	public void render(GameContainer container, Graphics g) {
		this.g = g;
		
		image.draw(100,100);
		g.setColor(Color.white);
		g.drawString("Move mouse over test image", 200, 20);
		g.setColor(read[0]);
		g.drawString(read[0].toString(), 100,300);
		g.setColor(read[1]);
		g.drawString(read[1].toString(), 150,320);
		g.setColor(read[2]);
		g.drawString(read[2].toString(), 200,340);
		g.setColor(read[3]);
		g.drawString(read[3].toString(), 250,360);
		if (read[4] != null) {
			g.setColor(read[4]);
			g.drawString("On image: "+read[4].toString(), 100,250);
		}
		if (read[5] != null) {
			g.setColor(Color.white);
			g.drawString("On screen: "+read[5].toString(), 100,270);
		}
	}

	/**
	 * @see org.newdawn.slick.BasicGame#update(org.newdawn.slick.GameContainer, int)
	 */
	public void update(GameContainer container, int delta) {
		int mx = container.getInput().getMouseX();
		int my = container.getInput().getMouseY();
		
		if ((mx >= 100) && (my >= 100) && (mx < 200) && (my < 200)) {
			read[4] = image.getColor(mx-100,my-100);
		} else {
			read[4] = Color.black;
		}
		
		read[5] = g.getPixel(mx, my);
	}

	/**
	 * Entry point to our test
	 * 
	 * @param argv The arguments to pass into the test
	 */
	public static void main(String[] argv) {
		try {
			AppGameContainer container = new AppGameContainer(new ImageReadTest());
			container.setDisplayMode(800,600,false);
			container.start();
		} catch (SlickException e) {
			e.printStackTrace();
		}
	}
}