JTurtle (SLogo API (including private classes))

java.lang.Object
- slogo.turtle.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`
`private java.awt.Image`	`image`
`(package private) java.awt.geom.Point2D`	`intermediatePoint`
`(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 TurtlePen`	`pen`
`(package private) static int`	`START_X`
`(package private) static int`	`START_Y`
`(package private) boolean`	`visible`
`(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)` Creates a turtle using a renderer

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addLineSegmentDuringMove(double deltaX, double deltaY)` adds a lineSegment during the move
`private java.awt.geom.Point2D`	`addOffsetToPoint(java.awt.geom.Point2D point)` Adds Offset to the point
`void`	`addTurtleListener(TurtleListener listener)` Add a listener.
`void`	`changeImage(java.awt.Image img)` Changes the image
`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.Image`	`getImage()` Get the image
`TurtlePen`	`getPen()` Gets the turtle's pen.
`java.awt.geom.Point2D`	`getPoint()` Returns the turtle's point (should be centroid)
`boolean`	`getVisibility()` Returns the turtle's visibility (true or false)
`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`	`setPen(TurtlePen pen)` Sets the pen
`void`	`setPoint(java.awt.geom.Point2D p)` Sets the turtles point, notifies listeners.
`void`	`setVisibility(boolean visible)` Sets visibility
`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
  - image
```
private java.awt.Image image
```
  - visible
```
boolean visible
```
  - myHeading
```
double myHeading
```
  - myPoint
```
java.awt.geom.Point2D myPoint
```
  - myNextPoint
```
java.awt.geom.Point2D myNextPoint
```
  - intermediatePoint
```
java.awt.geom.Point2D intermediatePoint
```
  - 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
  - pen
```
private TurtlePen pen
```
  - 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)
```
    Creates a turtle using a renderer
    
    Parameters:
    
    renderer - is the renderer used to create the turtle
- 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
  - 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
  - addLineSegmentDuringMove
```
public void addLineSegmentDuringMove(double deltaX,
                                     double deltaY)
```
    adds a lineSegment during the move
    
    Parameters:
    
    deltaX - is the change in x during the move
    
    deltaY - is the change in y during the move
  - addOffsetToPoint
```
private java.awt.geom.Point2D addOffsetToPoint(java.awt.geom.Point2D point)
```
    Adds Offset to the point
    
    Parameters:
    
    point - is the point to be offset
    
    Returns:
    
    the offset point
  - 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
  - getVisibility
```
public boolean getVisibility()
```
    Returns the turtle's visibility (true or false)
    
    Returns:
    
    if the turtle is visible or not
  - 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
  - changeImage
```
public void changeImage(java.awt.Image img)
```
    Changes the image
    
    Parameters:
    
    img - is the image to change to
  - getImage
```
public java.awt.Image getImage()
```
    Get the image
    
    Returns:
    
    the image
  - getPen
```
public TurtlePen getPen()
```
    Gets the turtle's pen.
    
    Returns:
    
    pen -the turtle's pen
  - setPen
```
public void setPen(TurtlePen pen)
```
    Sets the pen
    
    Parameters:
    
    pen - is the pen that is set
  - setVisibility
```
public void setVisibility(boolean visible)
```
    Sets visibility
    
    Parameters:
    
    visible - is whether or not it is visible

Class JTurtle

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

image

visible

myHeading

myPoint

myNextPoint

intermediatePoint

myRenderer

START_X

START_Y

WIDTH

HEIGHT

pen

myListeners

Constructor Detail

JTurtle

JTurtle

JTurtle

Method Detail

getBounds

reset

draw

trueHeading

move

addLineSegmentDuringMove

addOffsetToPoint

setHeading

setHeading

getHeading

getPoint

getVisibility

notifyListeners

addTurtleListener

setPoint

changeImage

getImage

getPen

setPen

setVisibility