1. Motions and Animation CS 110 – Honors Slides by Wanda Dann, Ithaca College

2. Composite Objects 4 In the previous lecture, we established that many objects are composites

3. First-class By default, an object is first-class

4. Object Parts 4 Object Parts are not first-class

5. Motion and First-Class Status 4 A first-class object –can be selected and moved by the mouse cursor –can be animated with commands (instructions) 4 Parts (not first-class) –cannot be individually selected and moved by the mouse cursor –but, can be animated with commands

6. Changing Status 4 A part can be made first class by checking IsFirstClass in the pop-up menu

7. Mouse vs. Command Motions 4 Mouse is used to –set up the initial scene –approximately position objects in the scene 4 Commands are used to –obtain specific alignments –position one object relative to another object –use instructions that are not available on the menus moveTo turnTo place

8. Levitation 4 Be cautious about un-intended levitations: –moving parts of objects independent of the composite object can cause the part to disconnect from the body –positioning objects without making sure they are in contact with one another can result in objects just floating around in the air

9. Creating Animations 4 A 4-step process –define the background of the setting –determine the objects and parts needed –position the objects in the initial scene –supply a list of instructions to perform the animated task 4 Corresponds to the problem-solving process used in any programming language

10. A First Example 4 Task: Create an animation of a rabbit walking towards a butterfly. 4 Opening Scene: –default world (green grass, blue sky) 4 Objects: –rabbit, butterfly

11. Initial Scene

12. Animation Script 4 Will develop in class.