package graphics;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * That's the interface implemented by EasyGraphics. 
 * It's the minimal set of methods needed. 
 */
interface GraphicsInterface {
	public void repaint(); // (re)paints the image
	public void set(int x, int y, int rgb); // sets a pixel
	public int get(int x, int y); // reads a pixel
}

/**
 * Helper Class. 
 * It extends JPlanel to overwrite paintComponent. 
 */
class DrawingPanel extends JPanel {

	private static final long serialVersionUID = 1L;

	public final BufferedImage bufferedImage;
	public final int width;
	public final int height;
	
	public DrawingPanel(int w, int h) {
		width = w;
		height = h;
		// Create image for double buffering
	    bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
	}
	
    @Override
    public void paintComponent(Graphics g) {
    	super.paintComponent(g);
	    Graphics2D g2dComponent = (Graphics2D) g;
	    g2dComponent.drawImage(bufferedImage, null, 0, 0);  	    
    }
}

/**
 * Wrapper class for Java graphics. 
 * The main idea is to simplify Java graphics but still offer all the functionality needed. 
 */
public class EasyGraphics implements GraphicsInterface {

	public JFrame frame; 
	public DrawingPanel drawing;

	public EasyGraphics(String title, int width, int height) {
		frame = new JFrame();
	    drawing = new DrawingPanel(width, height);
	    frame.add(drawing);
	    frame.setSize(width, height);
	    frame.setTitle(title);
	    frame.setLocationRelativeTo(null);
	    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setVisible(true);
	}
	public EasyGraphics() {
		this("Easy Graphics", 640, 480);
	}
	
	public void repaint() {
		drawing.repaint();
	}

	public void set(int x, int y, int rgb) {
		drawing.bufferedImage.setRGB(x, y, rgb);
	}

	public int get(int x, int y) {
		return drawing.bufferedImage.getRGB(x, y);
	}
}