import java.awt.*;

class Koch {
  public static void main(String[] args) {
    DrawingPanel panel = new DrawingPanel(800, 300);
    Graphics2D g = panel.getGraphics();
    g.translate(50, panel.getHeight() - 50);
    
    String path = "F";
    for (int i = 0; i < 5; i++) {
      path = path.replace("F", "F-F++F-F");
    }
    
    drawPath(path, g, 3);
  }
  
  // Accepts a String representing a drawing path, and draws the path according
  // to the following interpretation of characters within the String:
  //   F: draw a 40 pixel line to the right and move forward by 40 pixels
  //   +: rotate clockwise by PI/3 radians (60 degrees)
  //   -: rotate counterclockwise by PI/3 radians (60 degrees)
  public static void drawPath(String path, Graphics2D g, int size) {
    for (int i = 0; i < path.length(); i++) {
      char c = path.charAt(i);
      if (c == 'F') {
        g.drawLine(0, 0, size, 0);
        g.translate(size, 0);
      } else if (c == '+') {
        g.rotate(Math.PI/3.0);
      } else {
        g.rotate(-Math.PI/3.0);
      }
    }
  }
}