Alice: A Visual Introduction to Programming

1
Alice A Visual Introduction to Programming

• Chapter 1 Part 3

2
Modifying Objects
Use Mouse Mode Buttons
3
Modify Objects
Move Up and Down
Turn Left and Right
Tumble
Move Freely
Copy
Resize
When checked can modify subparts
Turn Forward and Backward
4
Center of an object

• Provides pivot or spin reference
• Object spins around center
• At the center of mass
• Where it stands on the ground
• Where it is held

5
Orientation

• When you click on an object and rotate it you
  will notice arrows
• Green points to up from the objects perspective
• Red points to where object thinks its right is
• Blue is forward to the object

6
Scene Editor Viewing Modes

• Single View
• Viewing scene from World View angle
• Quad view
• View scene from four views
• World View
• From top
• From right
• From front
• Allows you to position one object in relation to
  another object

Scroll
Zoom
Quad view
7
Relational Positioning in Quad View

• Notice how rabbit is positioned in relation to
  chicken

From the top
World view
Zoom
Scroll view
From the right
From the front
8
Using Coordinates

• Axes are measured in meters
• Point (0,0,0) is at center of the world
• Usually when an object is added to world by
  clicking on class then clicking on add instance
  the object is placed at (0,0,0)
• Can see position of an object in pointOfView
  property

X axis
9
Coordinate System
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Homework

• Read chapter 1
• Do tutorials
• Tutorials 1-4, p. 40
• Tutorials 1-5, p. 43
• Do lab assignments after handing in answered
  questions
• Answer questions in handout
• Do not do in class unless finished with lab
• Due one week after assigned

11
Lab

• Lab exercises require you to demonstrate your
  program to the professor
• When you write code you must explain to professor
  what each line of code does and why.
• Professor will sign lab sheet after you do that
• You only get full credit for lab exercise if
  professor signs lab sheet
• If you hand in lab without explaining code then
  you will lose half credit