Alice Workshop

1. Alice Workshop Implementation Algorithm  Code World.my first method Control blocks Statements (methods, data, more)

2. Next Step Problem Statement Understand the problem Test the code Design a solution Implement the design

3. Load World • Why start with a standard world for active learning? • Load from: Presentations/Worlds 3-GoodVibrationsSetUp.a2w

4. Do in order By default, statements in the code are performed in order, but you can also create a Do in order code block.

5. Control Statements • Alice has two fundamental control statements • Do in order • perform the actions in sequence • Do together • perform the actions simultaneously

6. First action statement

7. 1. Select object • Start by selecting an object in the object tree (or click on the object in the scene)

8. 2. Select methods tab • Tabs • Properties  values of object properties • Procedures methods that perform an action • Functions methods that return a value • In the details panel

9. 3. Find method tile • Scroll down in methods tab

10. 4. Drag-n-drop Select data from drop-down menu… “turn to face” needs a target object

11. Next Step Problem Statement Understand the problem Test the code Design a solution Implement the design

12. Play (Run) • Click the Play button

13. World.my first method • When Play button is clicked, the world’s my first method is executed

14. Modify • Alice allows some optional information to modify how an action is performed. • By default a statement in Alice runs in 1 second. The duration can be changed using more…

15. Next action • Actually, several actions

16. Method? • No “vibrate” tile? • Method tiles built-in to Alice are simple actions • Some models have complex actions defined, e.g., walk • For other complex actions, we may create our own

17. Decompose • How can we create our own “vibrate” method? • Decompose a complex action into simple actions garfield.vibrate do together play vibrating sound do in order garfield move up a short distance, quickly garfield move down same distance, quickly

18. Create a new method

19. Name the method • Name should begin with a lowercase letter and have no spaces (use camelCase, if needed)

20. garfield.vibrate • New method tile and editor tab

21. Number pad • Select “other” for number pad entry

22. Duplicate • Hold Ctrl(Alt on Mac) and drag statement down to create a duplicate

23. Modify • Click drop-down menu to select a different (argument) value

24. Test Warning???

25. Call the method • Alice must be given an instruction to perform the actions defined in the method.

26. Test Does the action performed by garfield appear to be a vibration? Why or why not?

27. Revise Design • An object that vibrates is oscillating in a rhythmic repetition • We need to repeat the action several times garfield.vibrate do together play vibrating sound repeat 5 times do in order garfield move up a short distance, quickly garfield move down same distance, quickly

28. Loop • Drag in Loop control tile and select “5 times”

29. Loop control block • Drag code statements into the Loop control block • A block of program code that repeats a counted number of times.

30. Test Does the action performed by garfield appear to be a vibration? Why or why not?

31. Revise #2 • Play a sound at the same time…. garfield.vibrate do together play vibration sound loop 5 times garfield moves up a short distance, quickly garfield moves down same distance, quickly

32. Import sound • World properties panel

33. Imported file, timing

34. Do together • Drag in do together code block

35. Play sound

36. Nested control blocks • Do in order inside do together

37. Test • Are sound and vibration in sync?

38. Wait • Useful for synchronizing sound and action

39. Save • Be sure to save the world every half-hour, or so…

40. Textbook • More information • Coding • Chapter 2, Section 2