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Creating a Simple Game in Alice. Barb Ericson Georgia Institute of Technology June 2008. Objectives. Show how to create a simple game in Alice Creating methods in Alice Creating a field or property of an object Creating a variable Using a while loop Creating a Boolean function

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creating a simple game in alice

Creating a Simple Game in Alice

Barb Ericson

Georgia Institute of Technology

June 2008

SimpleGameInAlice

objectives
Objectives
  • Show how to create a simple game in Alice
    • Creating methods in Alice
    • Creating a field or property of an object
    • Creating a variable
    • Using a while loop
    • Creating a Boolean function
    • Creating a comment

SimpleGameInAlice

things to consider
Things to Consider
  • All objects in an Alice movie or game must be created before the game starts
    • you can make them invisible to start
      • click on properties and set the opacity to 0
    • you can also hide objects by moving them under the ground
      • move down some amount
  • You can update a field (property) in an object to track if it has been clicked on

SimpleGameInAlice

click the zombie game
Click the Zombie Game
  • While the user hasn't won hide the zombie and after some random amount of time between 1-3 seconds have it pop up in a random place.
  • If the user clicks on the zombie increment the number of hits and when it reaches 5 let the user know s/he won
  • If the user doesn't click on the zombie within 1 second hide it again
  • Add instructions at the beginning to let the user know how to play
    • and then make them invisible after some amount of time

SimpleGameInAlice

set up the world
Set-up the World
  • Click on File -> New World
  • Select the Template tab
  • Click on the grass world
    • click on open

SimpleGameInAlice

add objects to the world
Add Objects to the World
  • Click the add objects button at the bottom of the scene
  • Scroll to the City category and click on City
  • Add some Buildings by dragging out some building clusters

SimpleGameInAlice

add the zombie
Add the Zombie
  • Click on Local Gallery to get back to the list of categories
  • Open the People category
  • Scroll over to Zombie and add one to the world

SimpleGameInAlice

hide the zombie
Hide the Zombie
  • Create a method to hide the zombie
    • Click on zombie in the object tree
    • Click on methods in the details window
    • Click the create new method button
    • name the method hide

SimpleGameInAlice

the hide method
The hide method
  • Click on propertiesin the detail window
  • Drag out opacity = 1 (100%)
  • Put it in the hide method
  • Change the opacity to 0 (0%)
  • Click on methods
  • Pull out zombie move down 2 meters

SimpleGameInAlice

create the pop up method
Create the pop up method
  • Click on methods
  • Click the create new method button
  • name the method popUp
    • move the zombie randomly
    • move the zombie up above the ground
    • make the zombie visible

SimpleGameInAlice

move the zombie randomly
Move the zombie randomly
  • Start by dragging out zombie move tiles
    • one for each of left, right, forward, and backward
  • Click on world in the object tree to select it
  • Click on functions in the details window
  • Drag out random number and drop it on the 1 meter
    • select 0 for min and 2 for the maximum

SimpleGameInAlice

add a comment
Add a comment
  • You can add a comment to explain what you are doing in English
  • Drag a // tile from the bottom of the method editing window to where you wish to place the comment
    • Click on the down arrow
    • Select other
    • Type in the comment

SimpleGameInAlice

showing the zombie
Showing the zombie
  • Click on zombie in the object tree to select it
  • Click on methods in the details window
  • Drag out a zombie move tile
    • select up 2 meters
  • Click on properties in the details window
  • Drag out opacity = 0
    • change to 1 (100%)

SimpleGameInAlice

adding a property field
Adding a property (field)
  • We need to store the number of hits on this zombie
  • Click on the properties tab
  • Click the create new variable button
  • name the variable numHits
    • set the value to 0

SimpleGameInAlice

increment the number of hits
Increment the number of hits
  • If the user clicks on the zombie we want to add 1 to the number of hits so far
  • Create a method that does this
    • It should be a new zombie method

SimpleGameInAlice

respond to mouse click on zombie
Respond to mouse click on zombie
  • In the events window click the create new event button
    • select When the mouse is clicked on something
  • Change the anything to the zombie (the entire zombie)
  • Change the nothing to zombie incrementHits

SimpleGameInAlice

method to run the game
Method to run the game
  • Click on world in the object tree
  • Select methods
  • Pull up a while tile from the bottom of the editor window
    • select true
  • Click on functions
    • drag out a < b and drop it on true
      • select 1 and 1

SimpleGameInAlice

while number of hits 5
While number of hits < 5
  • Click on zombie in the object tree
  • Click on properties
    • drag out numHits = 0 and drop on the first 1
  • Change the second 1 to 5
    • click on other and enter 5

SimpleGameInAlice

hide and wait a random amount of time
Hide and wait a random amount of time
  • Click on methods
  • Drag out hide
  • Drag up a wait tile from the bottom of the editor window
    • select 1 second
  • Click on world in the object tree
    • click on functions
    • drag out random number and drop on the 1 second

SimpleGameInAlice

pop up and wait for 1 second
pop up and wait for 1 second
  • Drag out a zombie popUp
  • Drag up a wait tile and select 1 second
  • Try it out!
    • What happens after you click on the zombie 5 times?

SimpleGameInAlice

tell the user s he won
Tell the user s/he won
  • Add some 3D text that tells the user she or he won
    • Click on File and then on Add 3D Text
    • Type in the text
      • you can change the font
  • Place it where you want it to appear
    • Click on add objects to get to the mouse controls
    • Click on done when done

SimpleGameInAlice

make the text invisible to start
Make the text invisible to start
  • Click on the text in the object tree
  • Click on properties
    • Modify opacity to 0

SimpleGameInAlice

when the user wins show the text
When the user wins show the text
  • Drag out opacity = 0 to the method
    • change to 1 (100%)
  • Play the game!

SimpleGameInAlice

speeding things up
Speeding things up
  • All animation takes 1 second by default
    • you can change this using the more…
  • Make the zombie move up or down and become visible and invisible at the same time
    • use a do together from the bottom of the editor window

SimpleGameInAlice

add instructions
Add instructions
  • Create 3D text that tells the user what to do in the game
  • When the game starts wait for 1 second
    • then make the text invisible
      • can set isShowing to false

SimpleGameInAlice

show the number of hits
Show the number of hits
  • Create 3D text that says Hits and one that says 0
  • Click on the 0 in the object tree
    • Click on properties
    • Drag out text = 0
      • select default string
  • Use the mouse controls to position the text
    • Click on Add Objects to see the mouse controls
      • when done click on done

SimpleGameInAlice

world incrementhits method
World incrementHits method
  • Add an incrementHits method to the world
    • call the zombie incrementHits method
    • click on 0 then properties
      • drag out text = 0
        • select default string
      • replace the default string with the what as string function in the world to convert the number to a string
      • choose expressions and pick zombie numHits as what to convert

SimpleGameInAlice

change when mouse clicked
Change when mouse clicked
  • Modify then when mouse is clicked on the zombie to call the world's incrementHits method
  • Try it!

SimpleGameInAlice

other ideas
Other Ideas
  • Have the zombie play a sound when hit
    • modify zombie incrementHits method
    • use play sound in methods
      • you can also record your own sounds
        • click on properties for the zombie
        • click on the + next to Sounds
        • and record a sound and name it
  • Count the number of times the zombie has appeared
  • Add a way to lose
    • maybe it will only run till it appears 10 times
    • maybe add a timer and a time limit
    • maybe add other objects that if you click on these you lose
  • Make the amount of time you give the user to click on the zombie a random amount from 0.5 to 1 second

SimpleGameInAlice

summary
Summary
  • Alice can be used to create simple 3D games
  • Concepts covered
    • creating methods
    • creating a property (field)
    • creating a variable
    • using a while loop
    • creating a comment

SimpleGameInAlice