Turtle Demo 4 Command Interpreter

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canvas.clear(); // Zeichenfläche löschen
var f = new Turtle(1);
var t = new Turtle(1);
var h = new Turtle(1);
f.penColor(255,0,0);       f.penWidth(5);
t.penColor(0,255,0);       t.penWidth(5);
h.penColor(0,0,255);       h.penWidth(5);
var fCmdList = ["F30", "R90", "F20", "L180", "F20", "R90", "F30", "R90", "F30" ];
var tCmdList = [ "U", "R90", "F45", "L90", "D", "F60", "L180", "F20", "R90", "F10", "L180", "F20" ];
var hCmdList = [ "U", "R90", "F70", "L90", "D", "F60", "L180", "F30", 
                      "L90", "F25", "L90", "F30", "R180", "F60", "L90" ];
function move(t, command) { // command interpreter
  switch (command.charAt(0)) {
    case 'F' : t.forward(parseInt(command.substring(1))); break;
    case 'R' : t.right(parseInt(command.substring(1))); break;
    case 'L' : t.left(parseInt(command.substring(1))); break;
    case 'U' : t.penUp(); break;
    case 'D' : t.penDown(); break;
  };
};
for(var step = 0; step < 20; step++) {
  if (step < fCmdList.length) move(f, fCmdList[step]);
  if (step < tCmdList.length) move(t, tCmdList[step]);
  if (step < hCmdList.length) move(h, hCmdList[step]);
}
// now the turtles leave the stage
f.penUp();   t.penUp();   h.penUp();
for(var i = 0 ; i < 30; i++) {
 h.forward(20); // leading
 t.setAngleTo(h);
 t.forward(20);
 f.setAngleTo(h);
 f.forward(20);
}
Turtle Demo 4 Command Interpreter

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