UpdateTextureExample.java

package org.andengine.examples;

import org.andengine.engine.camera.Camera;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.scene.IOnSceneTouchListener;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.scene.background.Background;
import org.andengine.entity.sprite.AnimatedSprite;
import org.andengine.entity.util.FPSLogger;
import org.andengine.input.touch.TouchEvent;
import org.andengine.opengl.texture.TextureOptions;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlas;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlasTextureRegionFactory;
import org.andengine.opengl.texture.region.TiledTextureRegion;
import org.andengine.ui.activity.SimpleBaseGameActivity;

import android.widget.Toast;

/**
 * (c) 2010 Nicolas Gramlich
 * (c) 2011 Zynga
 *
 * @author Nicolas Gramlich
 * @since 12:14:22 - 30.06.2010
 */
public class UpdateTextureExample extends SimpleBaseGameActivity {
	// ===========================================================
	// Constants
	// ===========================================================

	private static final int CAMERA_WIDTH = 480;
	private static final int CAMERA_HEIGHT = 320;

	// ===========================================================
	// Fields
	// ===========================================================

	private BitmapTextureAtlas mBitmapTextureAtlas;
	private TiledTextureRegion mFaceTextureRegion;

	private boolean mToggleBox = true;

	// ===========================================================
	// Constructors
	// ===========================================================

	// ===========================================================
	// Getter & Setter
	// ===========================================================

	// ===========================================================
	// Methods for/from SuperClass/Interfaces
	// ===========================================================

	@Override
	public EngineOptions onCreateEngineOptions() {
		Toast.makeText(this, "Touch the screen to update (redraw) an existing BitmapTextureAtlas with every touch!", Toast.LENGTH_LONG).show();

		final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

		return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);
	}

	@Override
	public void onCreateResources() {
		BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
		
		this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 64, 32, TextureOptions.BILINEAR);
		this.mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, "face_box_tiled.png", 0, 0, 2, 1);
		this.mBitmapTextureAtlas.load();
	}

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

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

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

		/* Create the face and add it to the scene. */
		final AnimatedSprite face = new AnimatedSprite(centerX, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());
		face.animate(100);
		scene.attachChild(face);

		scene.setOnSceneTouchListener(new IOnSceneTouchListener() {
			@Override
			public boolean onSceneTouchEvent(final Scene pScene, final TouchEvent pSceneTouchEvent) {
				if(pSceneTouchEvent.isActionDown()) {
					UpdateTextureExample.this.toggle();
				}
				return true;
			}
		});

		return scene;
	}

	// ===========================================================
	// Methods
	// ===========================================================

	private void toggle() {
		this.mBitmapTextureAtlas.clearTextureAtlasSources();
		this.mToggleBox = !this.mToggleBox;
		BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, this.mToggleBox ? "face_box_tiled.png" : "face_circle_tiled.png", 0, 0, 2, 1);
	}

	// ===========================================================
	// Inner and Anonymous Classes
	// ===========================================================
}