copyright 2011 wanda dann, steve cooper, don slater alice workshop implementation algorithm code...
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Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Alice Workshop
ImplementationAlgorithm CodeWorld.my first method
Control blocks
Statements (methods, data, more)
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Next Step
Problem Statement
Understand the
problem
Implement the design
Test the code
Design a solution
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Load World
Why start with a standard world for active learning?
Load from: Presentations/Worlds 3-GoodVibrationsSetUp.a2w
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Do in order By default, statements in the code are performed in order, but you can also create a Do in order code block.
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Control Statements
Alice has two fundamental control statements Do in order
• perform the actions in sequence Do together
• perform the actions simultaneously
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
First action statement
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
1. Select object
Start by selecting an object in the object tree (or click on the object in the scene)
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
2. Select methods tab
In the details panelTabs
Properties values of object properties
Procedures methods that perform an action
Functions methods that return a value
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
3. Find method tile
Scroll down in methods tab
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
4. Drag-n-drop
Select data from drop-down menu… “turn to face” needs a target object
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Next Step
Problem Statement
Understand the
problem
Implement the design
Test the code
Design a solution
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Play (Run)
Click the Play button
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
World.my first method
When Play button is clicked, the world’s my first method is executed
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
ModifyAlice 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…
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Next action
Actually, several actions
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
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
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
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
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Create a new method
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Name the method
Name should begin with a lowercase letter and have no spaces (use camelCase, if needed)
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
garfield.vibrate
New method tile and editor tab
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Number pad
Select “other” for number pad entry
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Duplicate
Hold Ctrl(Alt on Mac) and drag statement down to create a duplicate
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Modify
Click drop-down menu to select a different (argument) value
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Test
Warning???
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Call the method
Alice must be given an instruction to perform the actions defined in the method.
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Test
Does the action performed by garfield appear to be a vibration?
Why or why not?
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
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
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Loop
Drag in Loop control tile and select “5 times”
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Loop control block
Drag code statements into the Loop control block
A block of program code that repeats a counted number of times.
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Test
Does the action performed by garfield appear to be a vibration?
Why or why not?
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
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
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Import sound
World properties panel
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Imported file, timing
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Do together
Drag in do together code block
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Play sound
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Nested control blocks
Do in order inside do together
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Test
Are sound and vibration in sync?
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Wait
Useful for synchronizing sound and action
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Save
Be sure to save the world every half-hour, or so…
Copyright 2011Wanda Dann, Steve Cooper, Don Slater
Textbook
More information Coding
• Chapter 2, Section 2
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