gistfile1.txt

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.ImageObserver;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Mandelbrot extends Canvas  implements ImageObserver {
	
	private static final long serialVersionUID = 1L;
	public static final int WIDTH = 1200;
	public static final int HEIGHT = 1200;
	private static int BAILOUT = 256;
	private static int MAX_ITERATIONS = 64;
	
	public BufferStrategy strategy;
	
	public Mandelbrot () {
		setBounds(0,0,WIDTH,HEIGHT);
		setBackground(Color.BLACK);		
		
		JPanel panel = new JPanel();
		panel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
		panel.setLayout(null);
		
		panel.add(this);
		
		JFrame frame = new JFrame("Mandelbrot");
		frame.add(panel);
				
		frame.setBounds(0,0,WIDTH, HEIGHT);
		frame.setResizable(false);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		//create a double buffer
		createBufferStrategy(2);
		strategy = getBufferStrategy();
		requestFocus();
	}
	
	private int checkBounds(float x, float y) {
		float cr = x;
		float ci = y;
		float zi = 0.0f;
		float zr = 0.0f;
		int i = 0;
		
		while (true) {
			i++;
			float temp = zr * zi;
			float zr2 = zr * zr;
			float zi2 = zi * zi;
			zr = zr2 - zi2 + cr;
			zi = temp + temp + ci;
			if (zi2 + zr2 > BAILOUT)
				return i;
			if (i > MAX_ITERATIONS)
				return 0;
		}
	}
	
	private void draw() {		
		float x = -2.1f, y = -1.5f, z = 3.0f;
		int i, j;

		Graphics g = strategy.getDrawGraphics();
		g.clearRect(0, 0, getWidth(), getHeight());
		for (i =  0; i < HEIGHT; i++) {					
			for (j = 0; j < WIDTH; j++) {		
				
				int value = checkBounds((x + z*(i/(float)WIDTH)), (y + z*(j/(float)HEIGHT)));				
				if (value > 0) {
					g.setColor(new Color(value*255/MAX_ITERATIONS));
					g.drawRect(i, j, 0, 0);					
				}
			}												
		}	
		strategy.show();
	}

	public static void main(String args[]) {
		
		Mandelbrot m = new Mandelbrot();
		long startTime = System.currentTimeMillis();
		m.draw();
		System.out.println((System.currentTimeMillis() - startTime)/1000);
		
	}
}