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最新推荐文章于 2017-11-14 20:19:00 发布

原创最新推荐文章于 2017-11-14 20:19:00 发布 · 1k 阅读

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#system #class #框架

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本文通过实例解析如何在游戏开发中使用Sprite类显示精灵，包括配置摄像头、加载资源、设置背景及精灵坐标，增强编程技能。

public class SpriteExample extends BaseExample {

	private static final int CAMERA_WIDTH = 480;//照着前一篇文章的例子写就行了，框架都打好了
	private static final int CAMERA_HEIGHT = 320;

	private Camera mCamera;
	private BitmapTextureAtlas mBitmapTextureAtlas;
	private TextureRegion mFaceTextureRegion;

	@Override
	public Engine onLoadEngine() {
		this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
		return new Engine(new EngineOptions(true, ScreenOrientation.LANDSCAPE, 
				new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), this.mCamera));
	}

	@Override
	public void onLoadResources() {
		this.mBitmapTextureAtlas = new BitmapTextureAtlas(32, 32, TextureOptions.BILINEAR_PREMULTIPLYALPHA);
                //gfx是asset目录下的一个文件夹，里面有“face_box.png”这个图片
		BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
		this.mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, 
				this, "face_box.png", 0, 0);

		this.mEngine.getTextureManager().loadTexture(this.mBitmapTextureAtlas);
	}

	@Override
	public Scene onLoadScene() {
		this.mEngine.registerUpdateHandler(new FPSLogger());

		final Scene scene = new Scene();
		scene.setBackground(new ColorBackground(0.09804f, 0.6274f, 0.8784f));

		/* Calculate the coordinates for the face, so its centered on the camera. */
		final int centerX = (CAMERA_WIDTH - this.mFaceTextureRegion.getWidth()) / 2;
		final int centerY = (CAMERA_HEIGHT - this.mFaceTextureRegion.getHeight()) / 2;

		/* Create the face and add it to the scene. */
		final Sprite face = new Sprite(centerX, centerY, this.mFaceTextureRegion);
		scene.attachChild(face);

		return scene;
	}

	@Override
	public void onLoadComplete() {

	}
}

我学习的过程是，先试几个例子，学会用了，再问为什么。自己动手试一下SpriteExample.java 这个自带的例子，Sprite类的简单应用，在屏幕上显示一个精灵，可以增强自己的自信心。

ps: BitmapTextureAtlas的参数不能小于图片的大小，且必须为2的整数幂。TextureRegion定义了Texture上的一个矩形区域。Sprites使用TextureRegion使系统知道Sprite显示的是整个Texture的那部分。A TextureRegion defines a rectangle on the Texture. A TextureRegion is used by Sprites to let the system know what part of the big Texture the Sprite is showing