Using the swipe gesture
Video: Using the swipe gestureOne of the great things about creating games for mobile devices is also the touch screen. Now, with touch screens you can have gestures. And what I meant by gestures is you can, for instance, use two fingers to rotate an object or the same two fingers to maybe magnify an image--things like that. And you can add that into your game. And I am just going to go ahead and integrate that into this IntroScreen right here. So if they're playing this game on a device, they're going to be able to just take one finger and swipe with it.
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In Flash Professional CS5: Creating a Simple Game for Android Devices, author Paul Trani shows how to translate existing Flash skills from the web to mobile devices while designing a game in Flash and publishing it as an AIR for Android app. The finished application includes collision detection, random enemy creation and movement, shooting capabilities, multiple levels, and even a high score screen. This course also goes beyond game functionality and shows how to use mobile capabilities such as the accelerometer and gestures to control graphics, use the hardware keys to activate menus, and also how to optimize content so it plays well on mobile devices. Also included are instructions for distributing an app through the Android Market. Exercise files are included with the course.
- Designing for mobile platforms
- Creating and optimizing game graphics
- Adding random movement and interactivity
- Moving players based on the accelerometer
- Using gestures
- Detecting collisions
- Implementing audio
- Adding scoring and levels
- Implementing a high score screen
- Publishing an app on both Mac and Windows
- Uploading to the Android Market
Using the swipe gesture
One of the great things about creating games for mobile devices is also the touch screen. Now, with touch screens you can have gestures. And what I meant by gestures is you can, for instance, use two fingers to rotate an object or the same two fingers to maybe magnify an image--things like that. And you can add that into your game. And I am just going to go ahead and integrate that into this IntroScreen right here. So if they're playing this game on a device, they're going to be able to just take one finger and swipe with it.
So they don't have to hit the Play button. The whole screen is basically the Play button. And when they swipe with one finger, this screen is going to slide off. All right! And I am going to do this by using the Code Snippets panel in that Mobile Game folder. I am going to add a gesture swipe. So I am just going to double-click on that, and it's going to add that code to my Actions Frame in the Actions layer down at the bottom. So it says Gesture Swipe. I am first defining the input mode as being GESTURE.
Because I can also include various touch points, but gestures are basically a subset of a multi-touch touch points. So this basically is going to be really easy to use because in this case I am going to use Gesture Swipe. Also, what's available is zoom, Gesture rotate, and Gesture pan. All right, in this case I am just going to use the Swipe. So that's defined in right in here instance_name_here. Well, what do I want to swipe? I want to swipe the intro screens.
Let's go ahead and take all of this code and I am going to cut it, and I am going to move it up to the top of the Actions panel, where I see this intro screen. Right here, notice this is the EventListener and the function for the Play button. So just beneath that, I am just going to go ahead and paste in that gesture swipe, right in here. And so what I want to do is I am going to go ahead and move the introScreen. In fact, the whole thing is going to be the button. So I am just going to copy that word "introScreen" and I am going to paste it right in here.
So when there is a Gesture Swipe that's performed on the introScreen, go ahead and fire off this function called swipeAway. Within this function, I can go ahead and tap into a couple of different properties. Say for instance, if there is the Swipe Left, which is the offsetX, okay. So if the offsetX is equal to negative one, it's going to move to the left. So Swipe Left is going to be minus one, and then if you want to go to the right, it's going to be one.
If you want to go up, then the offsetY is going to be minus one. And the offsetY, if you want to move it down, then it's going to be one. And that will move it down. All right! So these are the different swipes you can do. You can basically swipe any sort of object you want. But really in here in this if statement is where I can go ahead and do something. In this case, the thing I want to do is I just want to go ahead and move that screen off.
So if they swipe to the left, go ahead and call this function called moveScreenOff. So I am just going to copy that and paste it right in here, moveScreenOff. Well, what do I want to move off? I want to move off the introScreen. So again, if they swipe the left, just go ahead and call this function, pass in that screen name, and what this tween does is this actually moves it off to the left-hand side. It's really that simple. And again it's just a simple gesture swipe is what's going to happen here on the introScreen.
So normally, I would test it in Device Central. Device Central actually does have, if I do a Device Central test, it does actually have a Multi-Touch panel. But quite frankly, not all of the Multi-Touch features work in it. So the Gesture zoom, the Gesture rotate will work in here. But in this case, what I want to do is I want to test this out on an actual device to show you that this is working. So here's the game on an actual device. And what I want to do is I am just going to go ahead and swipe with one finger to the left.
And you can see I am actually right into the game, and I can start playing it. Again, gesture swipe is really easy to use, and it adds additional functionality that you can use in your game.
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