![]() ParallaxView, pass in some resolution information, and set ![]() All it does is instantiate an instance of We will simply draw some text in between our layers just to see the effect. This implies that each background will be a separate instance of theĪrrayList for just two is probably overkill but you can then add as many layers as you like.ĭraw method will just need to call the layers in order at the same time as inserting any game objects in between the appropriate layers. Update to control shifting the two images (regular and reversed) of the background around. The class that does all the hard work will be calledīackground class will have a fairly in-depth constructor to initialize the instance, a method called Update method will only update the positions of our multiple backgrounds and the draw method (big reveal!) will draw them. We won’t obscure the parallax code by adding any extra game objects so the Thread instance that will run the main game loop which in turn will consist of the usual calls toĭraw methods. OnCreate and then set it as the view for the app. ParallaxActivity and the View-based class The code structure for this game is almost the same as the Simple Game Engine tutorial with one extra class and one extra method in the main View-based class. Immediately below ParallaxActivity but BEFORE the newly positioned > type or copy and paste these two lines to make the game run full screen and lock it in the landscape orientation.Īndroid : screenOrientation = "landscape".Tap the enter key a couple of times to move the > a couple of lines below the rest of the line shown above. Place the cursor before the closing > shown above.In the AndroidManifest.xml file, locate the following line of code,.In the project explorer pane in Android Studio double click on the manifests folder, this will open up the AndroidManifest.xml file in the code editor.We want to use every pixel that the device has to offer so we will make changes to the app’s AndroidManifest.xml configuration file. All the code and images are available on this page but if you want to help me out by telling others about this page then take a look at my bonus download for this project. Start a new project in Android Studio and choose the Empty Activity template without a layout file because we don’t need loads of auto-generated code and files. The two backgrounds will continuously scroll and as the right-hand image (either original or reversed) becomes the entire view that the player sees, the left-hand image (either original or reversed) will be moved to the right-hand-side ready to be scrolled into view. So what do we show on the last pixel on the right-hand side of the screen? We will make a reversed copy of the same image and show it to the right of the original(unreversed) image.Īs the original image and the reversed image are steadily scrolled to the left, eventually, half of each image will be shown, and so on.Įventually, we will be reaching the end of the original image and the last pixel on the right-hand-side of the reversed image will eventually be on-screen.Īt the point when the reversed image is shown in full on the screen, just like the original image was at the start, we will move the original image over to the right-hand side. The way the next frame is shown is to move the image off-screen to the left. Please note these images are not the ones to add to your project. The first frame of the game shows the background image like this. How the parallax effect is achieved in code Let’s code a parallax scrolling background. It is also possible with more modern hardware (like our Android phones) to have transparent parts to the layers and overlap them with other layers to create a more pleasing effect. Notice the foreground which is plain green with the occasional pot-hole, scrolls at a different(faster) speed to the background hills. Why not take a look at the video in the previous link. The first time the effect was used in a video game was Atari’s Moon Patrol. The famous Disney production Snow White used this effect as well as another trick where layers of backgrounds are moved in opposite directions to achieve a rotating effect. Video games didn’t invent this technique and the first modern use of the parallax effect dates back to early cinema. By moving the front layer(s) faster than the back the distance/depth effect is achieved. The parallax effect is when different layers of backgrounds are moved at different speeds to achieve the effect of motion and depth. In this tutorial, we will see the tricks and the code required to achieve a parallax scrolling background effect.
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