ch.aplu.turtle

Class TurtleRenderer

java.lang.Object

ch.aplu.turtle.TurtleRenderer

All Implemented Interfaces:

java.awt.image.ImageObserver

public class TurtleRenderer
extends java.lang.Object
implements java.awt.image.ImageObserver

This class is responsible for creating and selecting the correct turtle picture.

Field Summary

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor and Description
TurtleRenderer(Turtle turtle) Creates a TurtleRenderer instance for the given turtle.

Method Summary

Methods

Modifier and Type	Method and Description
java.awt.Image	currentImage() Returns the current image.
boolean	imageChanged(double angle) Tells whether the image has changed.
boolean	imageUpdate(java.awt.Image img, int infoflags, int x, int y, int width, int height) As an image stays unchanged, there's no need to ever update it.
void	init(TurtleFactory factory, int resolution) Creates the images.
void	paint(double x, double y) This method is responsible for painting the turtle onto the playground at (x, y).
void	paint(double x, double y, java.awt.Graphics g) This method is responsible for painting the Turtle at (x, y).
void	paint(java.awt.geom.Point2D.Double p) This method is responsible for painting the turtle onto the playground at p.
void	paint(java.awt.geom.Point2D.Double p, java.awt.Graphics g) This method is responsible for painting the Turtle at p.
void	setAngle(double angle) Sets the current image to the one corresponding to the angle angle.

Methods inherited from class java.lang.Object

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

Constructor Detail

TurtleRenderer

public TurtleRenderer(Turtle turtle)

Creates a TurtleRenderer instance for the given turtle.

Method Detail

imageUpdate

public boolean imageUpdate(java.awt.Image img,
                  int infoflags,
                  int x,
                  int y,
                  int width,
                  int height)

As an image stays unchanged, there's no need to ever update it. So this method returns always false. For further information cf. java.awt.image.ImageObserver.

Specified by:

imageUpdate in interface java.awt.image.ImageObserver

See Also:

ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)

currentImage

public java.awt.Image currentImage()

Returns the current image.

imageChanged

public boolean imageChanged(double angle)

Tells whether the image has changed.

setAngle

public void setAngle(double angle)

Sets the current image to the one corresponding to the angle angle.

init

public void init(TurtleFactory factory,
        int resolution)

Creates the images. There are resolution images (i.e. two subsequent images contain an angle of 2π/ or 360/resolution degrees).

paint

public final void paint(double x,
         double y)

This method is responsible for painting the turtle onto the playground at (x, y).

paint

public final void paint(java.awt.geom.Point2D.Double p)

This method is responsible for painting the turtle onto the playground at p.

paint

public final void paint(double x,
         double y,
         java.awt.Graphics g)

This method is responsible for painting the Turtle at (x, y).
The Graphics argument tells where to paint.

paint

public void paint(java.awt.geom.Point2D.Double p,
         java.awt.Graphics g)

This method is responsible for painting the Turtle at p.
The Graphics argument tells where to paint.