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Creating An Animation Program

Creating An Animation Program. Alice. Implementation. To implement the storyboard, translate the actions in the storyboard to a program. Program (a.k.a. script ) a list of instructions to have the objects perform certain actions in the animation. Writing the Program.

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Creating An Animation Program

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  1. Creating An AnimationProgram Alice

  2. Implementation • Toimplement the storyboard, translate the actions in the storyboard to a program. • Program (a.k.a. script) • a list of instructions to have the objects perform certain actions in the animation

  3. Writing the Program • Our planned storyboard (to-do list) is: • The idea now is to translate the design steps to program instructions. Do the following actions in order snowman turns to face snowwoman snowman “blinks eyes” and calls out to the snowwoman. snowwoman turns around. snowwoman blushes

  4. Translating the Design • Some steps in the storyboard can be written as a singleinstruction • The snowman turns to face the snowwoman • Other steps are composite actions that require more than one instruction • The snowman tries to catch the snowwoman’s attention is two actions • The snowman says “ahem” • The snowman raises and lowers his eyes

  5. Action Blocks in Alice Sequential Action Block Simultaneous Action Block

  6. Demo • Ch02Snowpeople

  7. Concepts in this first program • Program instructions may have arguments • Example: for the move instruction, the arguments we used in this example were • direction • distance • DoTogether and DoInOrder blocks can be nested one inside the other

  8. Testing • An important step in creating a program is to run it – to be sure it does what you expect it to do. • You should use an incremental development process: • write a few lines of code and then run it • write a few more lines and run it • write a few more lines and run it… • This process allows you to find any problems and fix them as you go along.

  9. Comments • While Alice instructions are easy to understand, a particular combination of the instructions may perform an action that is not immediately obvious. • Comments are used to document the code – explain the purpose of a particular segment of the program to the human reader.

  10. Demo • Ch02SnowpeoplewithComments • Comments in this example world illustrate • description of the action performed by the entire method • description of the purpose of a small segment of code

  11. Assignment • Read Chapter 2, Section 2 • A First Program • Read Tips & Techniques 2, Orientation and Movement Instructions

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