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Building Flash Games with Starling

Adding the smoke texture


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Building Flash Games with Starling

with Lee Brimelow

Video: Adding the smoke texture

So now that I've showed you how you can go ahead and create particle effects, let's incorporate the first particle effect into our actual game. So I've included two particle effects in the assets; the first is this smoke particle effect and this is going to be the exhaust for our hero ship. So I'm in our assets class. Now remember that our particle PNG file is actually in our texture atlas, so we don't need to actually go ahead, and embed that here. All we need to embed is the PEX file.
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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 0s
    1. Creating the Flash Builder project
      2m 40s
    2. Setting up your Starling scene
      6m 7s
    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. 7m 59s
    1. Adding the background
      1m 10s
    2. Creating the "Game Over" text
      2m 43s
    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 5s
    1. Creating sound effects with cfxr
      3m 5s
    2. Adding the sound effects
      3m 42s
    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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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 Games
Software:
ActionScript Flash Builder Flash Player Starling
Author:
Lee Brimelow

Adding the smoke texture

So now that I've showed you how you can go ahead and create particle effects, let's incorporate the first particle effect into our actual game. So I've included two particle effects in the assets; the first is this smoke particle effect and this is going to be the exhaust for our hero ship. So I'm in our assets class. Now remember that our particle PNG file is actually in our texture atlas, so we don't need to actually go ahead, and embed that here. All we need to embed is the PEX file.

So I'm going to say Embed(source=" assets/smoke.pex" which again is that XML file, and I'm just going to copy this, because again, since it's an XML file, we need to set its MIME type. And now I'm going to create this as a public static variable because we are going to reference this directly from our Hero class. Public static var and I'm just going to call it smokeXML, it's going to be of Type class.

Okay, so now let's go to our Hero class, and what I want to do is to set up this particle system. So I'm going to come under where we import our image. I'm going to create a new property called smoke, I'm going to set it equal to new, and then the class is PDParticleSystem. That's the class which actually handles our particle system. So to the constructor, you can see it's expecting that particle XML file which is our PEX file, and then our texture that we are using for the particle effect.

So I'm going to first have to cast that to an XML file and then create a new instance of Assets.smokeXML. Now for the texture, remember, that's in our texture atlas, so I'm going to say Assets.ta.getTexture and it's called smoke. Now we need to actually create that as an instance variable, and this has now instantiated our new particle system.

So now we need to set up its properties. So much like a movie clip where the movie clip needs to animate itself, we need to add it to the juggler object. We need to also do that for our particle effects. So we need to stay Starling and make sure we import that class, .juggler.add(smoke). Now we need to add it to the display list of our game. Now the reason we are adding it to the display list of our game, or our play state, is we are going to be moving these things kind of independently of each other, because again, if we just move this hero object, the particle system inside of it, if we add it to the display list here, is not going to be moving.

So we are not going to get nice trails that go back and forth as we move our ship. So that's why we are going to add the particle effect to the display list of the play state. So we are going to say play.addChild(smoke); and that's a very important part. Now what we need to do is to actually start the particle system. So we are going to say smoke and we are going to call the start method. Now if we want this to only last a certain amount of time, we want to pass in a duration here, and we will be doing this for the explosion particles.

But for this, we want it to be constant, because the ship is always going, so we want the smoke particle to always be running, and in that case, we can just leave out the duration, and it will automatically loop this thing. Okay, so now in our update method, we need to update the position of our smoke so that it sticks with the position of our ship. But the important thing to note is we are going to be changing the smoke.x because that's just essentially changing the coordinate system. What we need to change is the emitterX.

So it has an emitterX and emitterY property. Those are the values we want to change if we want to get nice side-to-side movement of our particle effect. So we are going to change that to the x position of the hero, and then smoke.emitterY, we are going to set that equal to the y position of our ship. But we are going to add 20 on it, so that it looks like it's coming out of the back of the ship. Okay, let's save that, and let's check it out. Now you can see we have our nice particle effect that moves side to side.

It looks really nice. I mean, one of the reasons I love Starling is that it's so easy to do these kinds of really rich particle effects that look really nice and really realistic. So that's our smoke particle effect. Now we are going to focus on the explosions which happen when a bullet actually hits one of these aliens.

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