Recursive Koch Snow Flakes in java

import java.awt.*;

import javax.swing.*;

public class recursiveKochSnowFlakes extends JApplet{
 int level = 0;

 public void init(){
  String levelStr = JOptionPane.showInputDialog("Enter the depth of recursion");

  level = Integer.parseInt(levelStr);
 }

 public void paint(Graphics g){

  drawSnow(g,level,20,280,280,280);
  drawSnow(g,level,280,280,150,20);
  drawSnow(g,level,150,20,20,280);

 }

 private void drawSnow (Graphics g, int lev, int x1, int y1, int x5, int y5){
       int deltaX, deltaY, x2, y2, x3, y3, x4, y4;

       if (lev == 0){

        g.drawLine(x1, y1, x5, y5);
       }
       else{
         deltaX = x5 - x1;
         deltaY = y5 - y1;

         x2 = x1 + deltaX / 3;
         y2 = y1 + deltaY / 3;

         x3 = (int) (0.5 * (x1+x5) + Math.sqrt(3) * (y1-y5)/6);
         y3 = (int) (0.5 * (y1+y5) + Math.sqrt(3) * (x5-x1)/6);

         x4 = x1 + 2 * deltaX /3;
         y4 = y1 + 2 * deltaY /3;

         drawSnow (g,lev-1, x1, y1, x2, y2);
         drawSnow (g,lev-1, x2, y2, x3, y3);
         drawSnow (g,lev-1, x3, y3, x4, y4);
         drawSnow (g,lev-1, x4, y4, x5, y5);
        }
    }
}