Script Java

11.4 Stack
import java.awt.event.*;
public class Turtle {
private Graphics graphics;
private Point position;
private int orientation;
public Turtle(Graphics g) {
graphics = g;
Rectangle clip = g.getClipBounds();
position = new Point(clip.x + clip.width/2,clip.y + clip.height/2);
orientation = 0;
}
public void forward(int distance) {
int x = position.x +
(int)Math.round(distance*Math.sin(Math.PI*orientation/180));
int y = position.y -
(int)Math.round(distance*Math.cos(Math.PI*orientation/180));
graphics.drawLine(position.x, position.y, x, y);
position.setLocation(x, y);
}
}
public void right(int angle) {
orientation = (orientation + angle) % 360;
}
public class Logo {
private Sequence code;
private Turtle turtle;
public abstract class Command {
abstract public void run();
abstract public String toString();
}
public class Forward extends Command {
private int argument;
public Forward(int n) {argument = n;}
public void run() {turtle.forward(argument);}
public String toString() {return "forward "+argument+"\n";}
}
public class Back extends Command {
private int argument;
public Back(int n) {argument = n;}
public void run() {turtle.forward(-argument);}
public String toString() {return "back "+argument+"\n";}
}
public class Right extends Command {
private int argument;
public Right(int n) {argument = n;}
public void run() {turtle.right(argument);}
public String toString() {return "right "+argument+"\n";}
}
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