jturtle
Class JTurtle

java.lang.Object
  jturtle.JTurtle

public class JTurtle
extends java.lang.Object

This class is a simple SLogo turtle model for illustrating rudimentary MVC for turtles and simple Graphics2D concepts

Author:

Owen Astrachan

Constructor Summary

JTurtle()
Create a turtle using the default (triangle) image.

JTurtle(java.awt.Image img)

Method Summary

void	addTurtleListener(TurtleListener listener) Add a listener.
void	draw(java.awt.Graphics g) Draw the turtle, pass in a Graphics2D object.
java.awt.Rectangle	getBounds(java.awt.Rectangle r) Mirrors the functionality of JComponent/Component.
double	getHeading() Returns the naive view of heading, 0 degrees = north
java.awt.geom.Point2D	getPoint() Returns the turtle's point (should be centroid)
void	move(int steps) Moves the turtle forward.
void	notifyListeners() Ask all registered listeners to process this turtle
void	reset() Reposition turtle at the origin, facing north.
void	setHeading(double radians) Set heading in radians, notify listeners.
void	setHeading(int degrees) Set heading in degrees, notify listeners.
void	setPoint(java.awt.geom.Point2D p) Sets the turtles point, notifies listeners.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JTurtle

public JTurtle()

Create a turtle using the default (triangle) image. In a more general architecture the image/shape might be passed in at construction time too.

JTurtle

public JTurtle(java.awt.Image img)

Method Detail

getBounds

public java.awt.Rectangle getBounds(java.awt.Rectangle r)

Mirrors the functionality of JComponent/Component. The current turtle isn't a Component, but it sort of acts like one (it's drawable).

See Also:

Component.getBounds()

reset

public void reset()

Reposition turtle at the origin, facing north.

draw

public void draw(java.awt.Graphics g)

Draw the turtle, pass in a Graphics2D object.

Parameters:

g - is the graphics context in which Turtle is drawn

move

public void move(int steps)

Moves the turtle forward.

Parameters:

steps - is the number of steps moved

setHeading

public void setHeading(int degrees)

Set heading in degrees, notify listeners.

Parameters:

degrees - will be Turtle's new heading

setHeading

public void setHeading(double radians)

Set heading in radians, notify listeners.

Parameters:

radians - Turtle's new heading

getHeading

public double getHeading()

Returns the naive view of heading, 0 degrees = north

Returns:

the heading

getPoint

public java.awt.geom.Point2D getPoint()

Returns the turtle's point (should be centroid)

Returns:

the center point

notifyListeners

public void notifyListeners()

Ask all registered listeners to process this turtle

addTurtleListener

public void addTurtleListener(TurtleListener listener)

Add a listener.

Parameters:

listener - is the listener added

setPoint

public void setPoint(java.awt.geom.Point2D p)

Sets the turtles point, notifies listeners.

Parameters:

p - is the new center point