ARTDM 170, Week9: Encapsulation + Paper Prototypes
1. ARTDM 170, Week 9:
Encapsulation and Paper
Prototypes
Gilbert Guerrero
gguerrero@dvc.edu
gilbertguerrero.com/blog/artdm-170
2. Homework
• Please put your files in a folder with
your last name and first initial
• Put the folder in my dropbox
• Example:
smith-h
MyAnimation.swf
MyProjectDescription.pdf
3. Open Flash
• Create a new ActionScript 3.0
document:
MyEncap.fla
• Create a new ActionScript file:
MyEncap.as
5. Intro and Ending Screens
• To encapsulate a movie, use 3 frames
‣ 1st frame holds the intro screen and
a button
‣ 2nd frame holds the game or movie
‣ 3rd frame holds a game over screen
and a restart button
6. Flash Buttons
To create a button:
• Create a new symbol in the Library
• Symbol type: Button
• In a button, each frame is a button state:
‣ Up - no user interaction
‣ Over - user mouse hovers over
‣ Down - user clicks the button
‣ Hit - invisible shape defines whatʼs
clickable
7. Encapsulation: Frame 1
In the first frame:
• Add a button to the stage
• Name the instance of the button “play_btn”
• Select the first frame and add this script:
play_btn.addEventListener(MouseEvent.CLICK,startGame);
function startGame(event:MouseEvent) {
gotoAndStop("playgame");
}
stop();
8. Encapsulation: Frame 2
• Create a second frame
• In the Properties panel, label the frame
“playgame”
• Create a MovieClip symbol in the Library
• Right click on the symbol to open Properties...
‣ Click Export for Animation
‣ Enter your movieʼs class name in the class field,
e.g. MyAnimation
• Drop an instance of the symbol onto the stage and
place it at (0,0) in the upper left corner of the
stage
9. Encapsulation: Frame 3
In the third frame:
• Add a button to the stage
• Name the instance of the button “replay_btn”
• Select the first frame and add this script:
replay_btn.addEventListener(MouseEvent.CLICK,playAgain);
function playAgain(event:MouseEvent) {
gotoAndStop("playgame");
}
In a game, the final frame of the encapsulation
would be your Game Over screen.
10. Getting to the third frame
Your encapsulated movie needs to provide a way to load
the third frame.
• Create a variable in your ActionScript class
public var bounceCount:Number = 0;
• Add 1 to the variable each time an event occurs
bounceCount++;
• When the variable reaches its limit, send the movie to
the “gameover” frame (you must refer to the root movie)
if (bounceCount >= 10000) {
MovieClip(root).gotoAndStop("gameover");
}
14. Storing and Retrieving
• Arrays can be used to store data
fruits = {“apples”,“oranges”,“bananas”}
• Data can be retrieved from arrays
using the index numbers
trace(fruits[0]); //apples
trace(fruits[1]); //oranges
trace(fruits[2]); //bananas
// I like to eat apples and oranges.
trace("I like to eat "+fruits[0]+" and "+fruits[1]+".");
• More about Arrays next week...
15. Randomization
• Generate a random number between 0
and .999999
Math.random()
• Round down using Math.floor and to
multiply Math.random by a number
get a random integer between zero and
your number
//generates integers from 0 to 29
Math.floor(Math.random()*30)
16. Homework, due Oct 21
• Read Chapter 5: Arrays in the
ActionScript 3.0 Cookbook, p103-136.
• Be sure you learn about these
functions:
‣ array.push()
‣ array.splice()
‣ array.concat()
‣ and Looping through an Array (see
section 5.2)
