FracTree

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;

public class FractalTree extends JFrame
{
    public double toRad(double grad)
    {
        return (grad*Math.PI)/180;
    }

    public FractalTree()
    {
        super("Fractal Tree");
        setBounds(0, 0, 1024, 768);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    private void drawTree(Graphics g, int x1, int y1, double angle, int depth)
    {
        if (depth == 0) return;
        int x2 = x1 + (int) (Math.cos(toRad(angle)) * depth * 10.0);
        int y2 = y1 + (int) (Math.sin(toRad(angle)) * depth * 10.0);
        g.drawLine(x1, y1, x2, y2);
        drawTree(g, x2, y2, angle - 20, depth - 1);
        drawTree(g, x2, y2, angle + 20, depth - 1);
    }

    @Override
    public void paint(Graphics g)
    {
        getContentPane().setBackground(Color.BLACK);
        g.setColor(Color.YELLOW);
        drawTree(g, 512, 768, -90, 11);
    }

    public static void main(String[] args) {
        JFrame jf = new FractalTree();
        jf.setVisible(true);
        jf.getContentPane().setBackground(Color.BLACK);
    }
}