Turtle Demo 5 FtH with rotation

<eval id="4adad1eed15db"> canvas.clear(); Turtle t1 = new Turtle(1); Turtle t2 = new Turtle(1); Turtle t3 = new Turtle(1); Turtle t4 = new Turtle(1); t1.penColor(0,255,0); t2.penColor(0,0,255); t3.penColor(255,0,0); t4.penColor(0,255,255); t1.penWidth(5); t2.penWidth(5); t3.penWidth(5); t4.penWidth(5); public void frame() { </eval>

 t4.penUp();  
 t4.forward(75);  
 t4.left(90);
 t4.forward(30);
 t4.left (90);
 t4.penDown();
 t4.forward(80);
 t4.left(90);
 t4.forward(170);
 t4.left(90);
 t4.forward(80);
 t4.left(90);
 t4.forward(170);

} public void fth() {

 t1.penDown();  t1.forward(30);
 t2.penUp();    t2.right (90);   t2.forward (40);  
 t3.penUp ();   t3.right(90);    t3.forward(80);  
 t1.right (90); t1.forward (20); t1.left(180);  t1.forward (20);  
 t2.left (90);  t2.penDown ();   t2.forward(60);
 t3.left (90);  t3.penDown ();   t3.forward(60);
 t1.right(90);  t1.forward (30); t1.right (90); t1.forward(20);
 t2.left(180);  t2.forward (20); t2.right (90); t2.forward(10);   t2.left(180);  t2.forward(20);
 t3.left (180); t3.forward(30);  t3.left(90);   t3.forward (25);  t3.left (90);  t3.forward(30);
    t3.right(180);  t3.forward(60);  t3.left(90);

} for(int i = 0; i < 18; i++){

 t1.home();  t2.home();  t3.home();  t4.home();
 frame();
 fth();
 t1.penUp(); t2.penUp(); t3.penUp(); t4.penUp();
 for(int i= 0; i < 23; i++){     
   t3.forward(20); 
   t1.setAngleTo(t3); t1.forward(17); 
   t2.setAngleTo(t3); t2.forward(17); 
   t4.setAngleTo(t3); t4.forward(17);
 }

}