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Creating a Simple Game in Alice

Creating a Simple Game in Alice. Barb Ericson Georgia Institute of Technology July 2009. 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

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  1. Creating a Simple Game in Alice Barb Ericson Georgia Institute of Technology July 2009 08-SimpleGameInAlice

  2. 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 08-SimpleGameInAlice

  3. 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 08-SimpleGameInAlice

  4. 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 08-SimpleGameInAlice

  5. Set-up the World • Click on File -> New World • Select the Template tab • Click on the grass world • click on open 08-SimpleGameInAlice

  6. 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 08-SimpleGameInAlice

  7. 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 08-SimpleGameInAlice

  8. 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 08-SimpleGameInAlice

  9. 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 08-SimpleGameInAlice

  10. 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 08-SimpleGameInAlice

  11. 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 08-SimpleGameInAlice

  12. 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 08-SimpleGameInAlice

  13. 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%) 08-SimpleGameInAlice

  14. 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 08-SimpleGameInAlice

  15. 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 08-SimpleGameInAlice

  16. 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 08-SimpleGameInAlice

  17. 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 08-SimpleGameInAlice

  18. 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 08-SimpleGameInAlice

  19. 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 08-SimpleGameInAlice

  20. 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? 08-SimpleGameInAlice

  21. 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 08-SimpleGameInAlice

  22. Make the text invisible to start • Click on the text in the object tree • Click on properties • Modify opacity to 0 08-SimpleGameInAlice

  23. When the user wins show the text • Drag out opacity = 0 to the method • change to 1 (100%) • Play the game! 08-SimpleGameInAlice

  24. 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 08-SimpleGameInAlice

  25. 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 08-SimpleGameInAlice

  26. 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 08-SimpleGameInAlice

  27. 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 08-SimpleGameInAlice

  28. Change when mouse clicked • Modify then when mouse is clicked on the zombie to call the world's incrementHits method • Try it! 08-SimpleGameInAlice

  29. 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 08-SimpleGameInAlice

  30. 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 08-SimpleGameInAlice

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