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
`java.awt.Color`	`color`
`(package private) static int`	`HEIGHT`
`java.util.ArrayList<TurtleLine>`	`lines`
`(package private) double`	`myHeading`
`private java.util.List<TurtleListener>`	`myListeners`
`java.awt.geom.Point2D`	`myNextPoint`
`java.awt.geom.Point2D`	`myPoint`
`(package private) Renderer`	`myRenderer`
`(package private) Renderer`	`newRenderer`
`private boolean`	`penDown`
`float`	`penWidth`
`private boolean`	`showing`
`(package private) static int`	`START_X`
`(package private) static int`	`START_Y`
`(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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addTurtleListener(TurtleListener listener)` Add a listener.
`void`	`changeRenderer(java.awt.Image img)`
`void`	`clearLines()` Clears the turtles lines, notifies listeners.
`void`	`draw(java.awt.Graphics g)` Draw the turtle if showing, 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.Color`	`getPenColor()`
`float`	`getPenWidth()`
`java.awt.geom.Point2D`	`getPoint()` Returns the turtle's point (should be centroid)
`void`	`hideTurtle()`
`boolean`	`isPenDown()`
`void`	`move(int steps)` Moves the turtle forward.
`void`	`notifyListeners()` Ask all registered listeners to process this turtle
`void`	`penDown()` Enables the turtle to draw lines
`void`	`penUp()` Disables the turtle to draw lines
`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`	`setPenColor(java.awt.Color c)`
`void`	`setPenWidth(float w)`
`void`	`setPoint(java.awt.geom.Point2D p)` Sets the turtles point, notifies listeners.
`void`	`showTurtle()`
`protected double`	`trueHeading()` Return the real/true heading of the turtle.
`boolean`	`turtleShowing()`

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

- Field Detail
  - newRenderer
```
Renderer newRenderer
```
  - myHeading
```
double myHeading
```
  - myPoint
```
public java.awt.geom.Point2D myPoint
```
  - myNextPoint
```
public java.awt.geom.Point2D myNextPoint
```
  - myRenderer
```
Renderer myRenderer
```
  - penDown
```
private boolean penDown
```
  - lines
```
public java.util.ArrayList<TurtleLine> lines
```
  - color
```
public java.awt.Color color
```
  - penWidth
```
public float penWidth
```
  - showing
```
private boolean showing
```
  - 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 if showing, pass in a Graphics2D object.
    
    Parameters:
    
    g - is the graphics context in which Turtle is drawn
  - changeRenderer
```
public void changeRenderer(java.awt.Image img)
```
  - hideTurtle
```
public void hideTurtle()
```
  - showTurtle
```
public void showTurtle()
```
  - turtleShowing
```
public boolean turtleShowing()
```
  - 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. If the pen is down draw lines
    
    Parameters:
    
    steps - is the number of steps moved
  - penDown
```
public void penDown()
```
    Enables the turtle to draw lines
  - penUp
```
public void penUp()
```
    Disables the turtle to draw lines
  - isPenDown
```
public boolean isPenDown()
```
  - setPenColor
```
public void setPenColor(java.awt.Color c)
```
  - getPenColor
```
public java.awt.Color getPenColor()
```
  - setPenWidth
```
public void setPenWidth(float w)
```
  - getPenWidth
```
public float getPenWidth()
```
  - 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
  - clearLines
```
public void clearLines()
```
    Clears the turtles lines, notifies listeners.

Class JTurtle

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

newRenderer

myHeading

myPoint

myNextPoint

myRenderer

penDown

lines

color

penWidth

showing

START_X

START_Y

WIDTH

HEIGHT

myListeners

Constructor Detail

JTurtle

JTurtle

JTurtle

Method Detail

getBounds

reset

draw

changeRenderer

hideTurtle

showTurtle

turtleShowing

trueHeading

move

penDown

penUp

isPenDown

setPenColor

getPenColor

setPenWidth

getPenWidth

setHeading

setHeading

getHeading

getPoint

notifyListeners

addTurtleListener

setPoint

clearLines