wanda dann don slater classes and objects copyright 2012 wanda dann, don slater all rights reserved

Wanda [email protected]

Don [email protected]

Classes and Objects

Copyright 2012 Wanda Dann, Don SlaterAll rights reserved

mailto:[email protected]

Alice EnvironmentScene EditorCode Editor

Classes

Objects


Each 3D model is a pre-written class In Alice, a class defines

◦ A plan for constructing an object in an Alice scene◦ Actions an object of that class can perform


An Alice class is similar to an architect's blueprint for building a house.◦ Not the actual house -- just a plan for

constructing a house, based on a sketch of what it will look like.


An instance of a class is an objectThe following slides illustrate how to create

(construct) an object in an Alice scene.


Where the program for

the animation or

game is written

Code Editor


Code editorScene view

Methods panel

Control tiles

Click on Setup

Scene to go to the Scene Editor

Go to Scene Editor


Scene Editor


Where the scene for the animation or

game is created

Scene setup panel

Gallery panel

Gallery foldersIn the gallery, classes are organized in folders.• Each class folder is like a drawer in a file cabinet, where all

classes of the same type are stored.

Flyer (has wings and can fly)

Biped (walks on 2 legs)

Quadraped (walks on 4 legs)

Swimmer (lives in water, swims)


Select the class folder for the type of object that you wish to add to the scene.

In this example, we click on Quadruped.

Select class folder


• Within the Quadruped folder are images of each class in this folder.

• Each image is labeled with the name of the class and shows a preview for an instance of that class.

Quadruped – walks on 4 legs


Click on the image to select one of 5 versions of the BabyDragon class.

Select class


5 different BabyDragonclasses

Click on the image to create a new BabyDragon object

Select class


Enter a name for the new object you are constructing from the BabyDragon class

Adding a Camel object to a Scene

• We have constructed an instance of the BabyDragon class and identified it with the name fergie.

• We say an instance of a class is an object.

Instance/object


• An instance of an object may be added to a scene by clicking and dragging the image into the scene view.

Instance construction - Alternative

Instances of same class• Can have more than one instance of the

same class. • Example: fergie and bert are two instances of

the BabyDragon class.

wanda dann don slater classes and objects copyright 2012 wanda dann, don slater all rights reserved

Documents