JTurtle (SLogo API (including private classes))

java.lang.Object
- jturtle.JTurtle

```
public class JTurtle
extends java.lang.Object
```
This class is a simple MoboLogo/Slogo turtle model for illustrating rudimentary MVC for turtles and simple Graphics2D concepts

Field Summary

Fields
Modifier and Type	Field and Description
`(package private) static int`	`HEIGHT`
`(package private) double`	`myHeading`
`private java.util.List<TurtleListener>`	`myListeners`
`(package private) java.awt.geom.Point2D`	`myNextPoint`
`(package private) java.awt.geom.Point2D`	`myPoint`
`(package private) Renderer`	`myRenderer`
`private boolean`	`penDown`
`(package private) static int`	`START_X`
`(package private) static int`	`START_Y`
`private java.util.List<java.awt.geom.Point2D>`	`trail`
`(package private) static int`	`WIDTH`

Constructor Summary

Constructors
Modifier	Constructor and Description
	`JTurtle()` Create a turtle using the default (triangle) image.
	`JTurtle(java.awt.Image img)` Creates a turtle using the given image
`private`	`JTurtle(Renderer renderer)`

Method Summary

Methods
Modifier and Type	Method and Description
`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`	`paintTrail(java.awt.Graphics g)`
`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.
`protected double`	`trueHeading()` Return the real/true heading of the turtle.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - trail
```
private java.util.List<java.awt.geom.Point2D> trail
```
  - penDown
```
private boolean penDown
```
  - myHeading
```
double myHeading
```
  - myPoint
```
java.awt.geom.Point2D myPoint
```
  - myNextPoint
```
java.awt.geom.Point2D myNextPoint
```
  - myRenderer
```
Renderer myRenderer
```
  - START_X
```
static final int START_X
```
    See Also:
    Constant Field Values
  - START_Y
```
static final int START_Y
```
    See Also:
    Constant Field Values
  - WIDTH
```
static final int WIDTH
```
    See Also:
    Constant Field Values
  - HEIGHT
```
static final int HEIGHT
```
    See Also:
    Constant Field Values
  - myListeners
```
private java.util.List<TurtleListener> myListeners
```
- Constructor Detail
  - JTurtle
```
public JTurtle()
```
    Create a turtle using the default (triangle) image.
  - JTurtle
```
public JTurtle(java.awt.Image img)
```
    Creates a turtle using the given image
    
    Parameters:
    img - the image to use for the turtle
  - JTurtle
```
private JTurtle(Renderer renderer)
```
- 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
  - paintTrail
```
public void paintTrail(java.awt.Graphics g)
```
  - trueHeading
```
protected double trueHeading()
```
    Return the real/true heading of the turtle. A Turtle's "heading" is what naive users would expect, i.e., 0 degrees == north, 90 degrees = east, -90 degrees = west. The trueheading translates to what Graphics/geometry expects
    
    Returns:
    the true heading in radians
  - 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

Class JTurtle

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

trail

penDown

myHeading

myPoint

myNextPoint

myRenderer

START_X

START_Y

WIDTH

HEIGHT

myListeners

Constructor Detail

JTurtle

JTurtle

JTurtle

Method Detail

getBounds

reset

draw

paintTrail

trueHeading

move

setHeading

setHeading

getHeading

getPoint

notifyListeners

addTurtleListener

setPoint