Building Flash Games with Starling
Illustration by John Hersey

Creating the three game states


From:

Building Flash Games with Starling

with Lee Brimelow

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Video: Creating the three game states

So now that we have our IState interface created, we can go ahead and create those three Game states: the Menu state, the Play state and the Game Over state. So I'm going to right-click on our source folder and choose New > ActionScript Class, and for a Package we are going to store these state classes in a package called states. And the first one I'm going to create is the Menu state. Now for a superclass this is going to subclass starling.display.Sprite, because it's going to contain the actual visual representation for the state.
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  1. 2m 9s
    1. Welcome
      45s
    2. Using the exercise files
      36s
    3. What you should know
      48s
  2. 10m 21s
    1. Checking out the finished product
      1m 10s
    2. Downloading the Starling framework
      4m 13s
    3. Installing Flash Builder
      1m 44s
    4. Installing additional tools
      1m 30s
    5. Overview of the Starling framework
      1m 44s
  3. 13m 1s
    1. Creating the Flash Builder project
      2m 40s
    2. Setting up your Starling scene
      6m 8s
    3. Creating the main game class
      4m 13s
  4. 13m 52s
    1. Creating the IState interface
      2m 14s
    2. Creating the three game states
      3m 50s
    3. Building the state machine
      7m 48s
  5. 22m 14s
    1. Creating a static assets class
      2m 3s
    2. Adding images and creating textures
      3m 24s
    3. Creating sprite sheets with TexturePacker
      6m 26s
    4. Creating the main texture atlas
      3m 29s
    5. Creating and importing bitmap fonts
      6m 52s
  6. 14m 16s
    1. Creating the Background class
      5m 55s
    2. Adding the logo
      2m 58s
    3. Adding the play button
      3m 4s
    4. Implementing the destroy method
      2m 19s
  7. 56m 47s
    1. Adding the background
      1m 3s
    2. Creating the Hero class
      6m 14s
    3. Creating the Bullet class
      1m 44s
    4. Creating the BulletManager class
      4m 23s
    5. Using the StarlingPool class
      9m 24s
    6. Firing bullets with the mouse
      7m 24s
    7. Creating the Alien movie clip
      1m 58s
    8. Creating the AlienManager class
      8m 12s
    9. Overview of collision-detection options
      3m 10s
    10. Creating the CollisionManager class
      10m 51s
    11. Implementing the destroy method
      2m 24s
  8. 8m 0s
    1. Adding the background
      1m 10s
    2. Creating the "Game Over" text
      2m 44s
    3. Adding the Try Again button
      4m 6s
  9. 20m 5s
    1. Exploring particle-creation tools
      4m 52s
    2. Adding the smoke texture
      5m 3s
    3. Creating the Explosion class
      2m 6s
    4. Creating the ExplosionManager class
      8m 4s
  10. 11m 6s
    1. Creating sound effects with cfxr
      3m 5s
    2. Adding the sound effects
      3m 43s
    3. Creating the Score class
      4m 18s
  11. 6m 1s
    1. Starling optimization tips
      4m 8s
    2. Helpful Starling resources
      1m 53s

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Watch the Online Video Course Building Flash Games with Starling
2h 57m Intermediate Jul 05, 2012

Viewers: in countries Watching now:

Join Lee Brimelow in this project-style course that teaches how to build a Flash-based game with Flash Builder 4.6, Flash Player 11, and the Starling framework. Starling, a pure ActionScript 3.0 library for advanced graphics, extends Flash Player 11's support for the modern GPU (graphic processing unit) to enable visual presentations and games in the browser or as a mobile app.

Starting with installation and configuration of Starling and creation of a Flash Builder project, the course shows how to prepare and import graphical assets, create MovieClip classes from sprite sheets, manage various gaming objects, detect collisions, and add both particle and sound effects. The finished game can be deployed to any browser or mobile device that integrates Flash Player 11, which was released in September 2011.

Topics include:
  • Downloading and installing Starling and Flash Builder
  • Creating the project
  • Creating the main game class, static assets class, and other classes
  • Building the state machine
  • Creating a static assets class
  • Adding images
  • Creating sprite sheets with Texture Packer
  • Creating and importing bitmap fonts
  • Detecting collisions
  • Adding particle effects
  • Adding sound effects
Subjects:
Developer Web
Software:
ActionScript Flash Builder Flash Player Starling
Author:
Lee Brimelow

Creating the three game states

So now that we have our IState interface created, we can go ahead and create those three Game states: the Menu state, the Play state and the Game Over state. So I'm going to right-click on our source folder and choose New > ActionScript Class, and for a Package we are going to store these state classes in a package called states. And the first one I'm going to create is the Menu state. Now for a superclass this is going to subclass starling.display.Sprite, because it's going to contain the actual visual representation for the state.

And for interfaces we are going to Add that IState interface, so if we actually just search for it here we can see the IState interface, click OK, and now we can click Finish. And you could see automatically by implementing that interface it's now created the update and destroy methods for us. So we are going to make a couple of changes to this. The first thing we are going to do is when we create one of these states from our Game class, we are actually going to send in a reference to our main Game class so that we can communicate back to it.

So in the constructor here, I'm going to put an argument called game, and this is going to be of type Game. And now inside of our constructor we are going to create an instance property called game, so I'm going to say this.game = game; and now I can hit Command+1 or Ctrl+1 to get a quick fix to create that as an instance variable at the top. So now anywhere inside of this state I can actually call back to our main Game class. Now the next thing I'm going to do is to add an event listener for the added to stage event, again because we don't want to do anything here until we know it's been added to the stage.

So I'm going say addEventListener and again be sure when you are importing event that you are importing starling.events.Event. We are going to listen for ADDED_TO_ STAGE and we are going to have it call a function called init. And let's go ahead and define that function now. So private function init, we are going to have our event object be of type starling.events.Event. I'm not going to return anything and now we have that set up. So this is going to be main template that each of our states is going to implement.

So what I'm going to do is copy this entire class to the clipboard, and now I'm going to right-click in the states package and we are going to create the other two states. So New > ActionScript Class, and this one is going to be called Play, and again, the Superclass is going to be starling.display.Sprite. For interfaces we are going to implement that IState interface and click Finish. Now I'm just simply going to select all of text in here and paste in that Menu state, because now all we need to do is to simply change Menu to Play here and there, and now we have our Play state created.

So now we are going to do the same thing for the Game Over state. So New > ActionScript Class, this one is called GameOver, Superclass is going to be Sprite. We are going to implement the IState interface, click Finish, and again, replace the text with the text that's on the clipboard, change this to GameOver and GameOver like that. So now you can see we have our states package and we have our three states created.

So now in the next movie we are going to look at implementing a state machine which is going to control the switching of the various states of our game.

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