src/main/java/org/teachingextensions/WindowUtils/MultiTurtleWindow.java
public void addTurtle(Turtle turtle)
  {
    if (turtle == null) { return; }
    turtle.setFrame(this.getFrame());
    turtle.setPanel(this);
    this.turtles.add(turtle);
    clearPainters();
    configurePainters();
  }
public void addTurtle(Turtle turtle)
  {
    if (turtle == null) { return; }
    turtle.setFrame(this.getFrame());
    turtle.setPanel(this);
    this.turtles.add(turtle);
    clearPainters();
    configurePainters();
  }
Adds a turtle instance to a window
NOTE: this method must be called BEFORE calling any other methods on turtle instances
<p><b>Example:</b> {@code multiTurtleWindow.addTurtle(myTurtle)}</p>

@param turtle
A turtle instance