Alice: A Visual Introduction to Programming Chapter 1 Part 3

Modifying Objects 1-2 Use Mouse Mode Buttons

Modify Objects 1-3 Move Freely Move Up and Down Turn Left and Right Tumble Copy Resize Turn Forward and Backward When checked can modify subparts

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

Orientation When you click on an object and rotate it you will notice arrows o Green points to up from the objects perspective o Red points to where object thinks its right is o Blue is forward to the object 1-5

Scene Editor Viewing Modes Single View o Viewing scene from World View angle Quad view o View scene from four views  World View  From top  From right  From front o Allows you to position one object in relation to another object 1-6 Zoom Scroll Quad view

Relational Positioning in Quad View Notice how rabbit is positioned in relation to chicken 1-7 From the rightFrom the front From the topWorld view Scroll view Zoom

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 1-8 X axis

Coordinate System 1-9

Homework Read chapter 1 Do tutorials o Tutorials 1-4, p. 40 o Tutorials 1-5, p. 43 Answer questions in handout Do lab assignments after handing in answered questions Due one week after assigned with 1 week grace 1-10

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