Class Pen

public class Pen

A simple Pen class which implements turtle style graphics. The pen has a position and an angle, and can be either up or down. All distances are in pixels. Angles are specified in degrees.

Version:

$Id: Pen.java,v 1.2 2001/04/04 03:25:12 administrator Exp $

Author:

Ben Dugan

Constructor Detail

Pen

public Pen()

Create a new Pen. By default, the pen is created in the down state, and positioned in the center of the window, facing right (angle 0).

Method Detail

down

public void down()

Set the pen's state to down.

up

public void up()

Raise the pen.

erase

public void erase()

Erase the window.

home

public void home()

Send the pen to the home position.

turn

public void turn(int degrees)

Turn the pen this many degrees.

Parameters:

degrees - a positive number is degrees to the "left"

move

public void move(int distance)

Move the pen the given distance. If the pen is down, a line is drawn.

toString

public java.lang.String toString()

Return the pen's printed representation.

Overrides:

toString in class java.lang.Object

squiral

public void squiral(int steps,
                    int angle,
                    int distance)

Draw a squiral.

Parameters:

steps - the number of steps (lines) to draw

angle - the amount to turn after each step

distance - the length by which to grow every third line

main

public static void main(java.lang.String[] args)

Test the pen with the squiral method.