Class SceneElement

java.lang.Object
  SceneElement

Direct Known Subclasses:

SceneElementLayered, SceneElementPositioned

public abstract class SceneElement
extends Object

Represents an element that knows how to draw itself in a scene using a Turtle to do the drawing

Author:

Mark Guzdial, Barb Ericson

Constructor Summary

SceneElement()

Method Summary

void	add(SceneElement node) Add the input node after the last node in this list.
int	count() Return the number of elements in the list
void	drawFromMeOn(Picture bg) Method to draw from this node on in the list.
abstract void	drawWith(Turtle t)
SceneElement	getNext() Method to get the next element
Picture	getPicture() Returns the picture in the node.
void	insertAfter(SceneElement node) Insert the input node after this node.
SceneElement	last() Return the last element in the list
void	remove(SceneElement node) Method to remove node from list, fixing links appropriately.
SceneElement	reverse() Reverse the list starting at this, and return the last element of the list.
void	setNext(SceneElement nextOne) Method to set the next element
void	setPicture(Picture pict) Method to set the picture in the node

Methods inherited from class java.lang.Object

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

Constructor Detail

SceneElement

public SceneElement()

Method Detail

setNext

public void setNext(SceneElement nextOne)

Method to set the next element

Parameters:

nextOne - next element in list

getNext

public SceneElement getNext()

Method to get the next element

Returns:

the next element

getPicture

public Picture getPicture()

Returns the picture in the node.

Returns:

the picture in the node

setPicture

public void setPicture(Picture pict)

Method to set the picture in the node

Parameters:

pict - the picture to use

drawFromMeOn

public void drawFromMeOn(Picture bg)

Method to draw from this node on in the list. For positioned elements, compute locations. Each new element has it's lower-left corner at the lower-right of the previous node. Starts drawing from left-bottom

Parameters:

bg - Picture to draw drawing on

drawWith

public abstract void drawWith(Turtle t)

remove

public void remove(SceneElement node)

Method to remove node from list, fixing links appropriately.

Parameters:

node - element to remove from list.

insertAfter

public void insertAfter(SceneElement node)

Insert the input node after this node.

Parameters:

node - element to insert after this.

last

public SceneElement last()

Return the last element in the list

count

public int count()

Return the number of elements in the list

Returns:

the number of elements in the list

reverse

public SceneElement reverse()

Reverse the list starting at this, and return the last element of the list. The last element becomes the FIRST element of the list, and THIS goes to null.

add

public void add(SceneElement node)

Add the input node after the last node in this list.

Parameters:

node - element to insert after this.