MainActivity.java

package com.joshskeen.andengine;

import android.hardware.SensorManager;
import android.widget.Toast;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.FixtureDef;

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.primitive.Rectangle;
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.extension.physics.box2d.PhysicsConnector;
import org.andengine.extension.physics.box2d.PhysicsFactory;
import org.andengine.extension.physics.box2d.PhysicsWorld;
import org.andengine.extension.physics.box2d.util.Vector2Pool;
import org.andengine.input.sensor.acceleration.AccelerationData;
import org.andengine.input.sensor.acceleration.IAccelerationListener;
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.ITiledTextureRegion;
import org.andengine.opengl.vbo.VertexBufferObjectManager;
import org.andengine.ui.activity.SimpleBaseGameActivity;
import org.andengine.util.debug.Debug;
import org.andengine.util.math.MathUtils;


public class MainActivity extends SimpleBaseGameActivity implements IAccelerationListener, IOnSceneTouchListener {
    // ===========================================================
    // Constants
    // ===========================================================

    protected static final int CAMERA_WIDTH = 720;
    protected static final int CAMERA_HEIGHT = 480;

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

    private BitmapTextureAtlas mBitmapTextureAtlas;

    private Scene mScene;

    protected ITiledTextureRegion mBoxFaceTextureRegion;
    protected ITiledTextureRegion mCircleFaceTextureRegion;

    protected PhysicsWorld mPhysicsWorld;

    private int mFaceCount = 0;

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

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

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

    @Override
    public EngineOptions onCreateEngineOptions() {
        Toast.makeText(this, "Touch the screen to add objects.", 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, 64, TextureOptions.BILINEAR);
        this.mBoxFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, "face_box_tiled.png", 0, 0, 2, 1); // 64x32
        this.mCircleFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, "face_circle_tiled.png", 0, 32, 2, 1); // 64x32
        this.mBitmapTextureAtlas.load();
    }

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

        this.mScene = new Scene();
        this.mScene.setBackground(new Background(0, 0, 0));
        this.mScene.setOnSceneTouchListener(this);

        this.mPhysicsWorld = new PhysicsWorld(new Vector2(0, SensorManager.GRAVITY_EARTH), false);

        final VertexBufferObjectManager vertexBufferObjectManager = this.getVertexBufferObjectManager();
        final Rectangle ground = new Rectangle(0, CAMERA_HEIGHT - 2, CAMERA_WIDTH, 2, vertexBufferObjectManager);
        final Rectangle roof = new Rectangle(0, 0, CAMERA_WIDTH, 2, vertexBufferObjectManager);
        final Rectangle left = new Rectangle(0, 0, 2, CAMERA_HEIGHT, vertexBufferObjectManager);
        final Rectangle right = new Rectangle(CAMERA_WIDTH - 2, 0, 2, CAMERA_HEIGHT, vertexBufferObjectManager);

        final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0, 0.5f, 0.5f);
        PhysicsFactory.createBoxBody(this.mPhysicsWorld, ground, BodyDef.BodyType.StaticBody, wallFixtureDef);
        PhysicsFactory.createBoxBody(this.mPhysicsWorld, roof, BodyDef.BodyType.StaticBody, wallFixtureDef);
        PhysicsFactory.createBoxBody(this.mPhysicsWorld, left, BodyDef.BodyType.StaticBody, wallFixtureDef);
        PhysicsFactory.createBoxBody(this.mPhysicsWorld, right, BodyDef.BodyType.StaticBody, wallFixtureDef);

        this.mScene.attachChild(ground);
        this.mScene.attachChild(roof);
        this.mScene.attachChild(left);
        this.mScene.attachChild(right);

        this.mScene.registerUpdateHandler(this.mPhysicsWorld);

        return this.mScene;
    }

    @Override
    public boolean onSceneTouchEvent(final Scene pScene, final TouchEvent pSceneTouchEvent) {
        if (this.mPhysicsWorld != null) {
            if (pSceneTouchEvent.isActionDown()) {
                this.addFace(pSceneTouchEvent.getX(), pSceneTouchEvent.getY());
                return true;
            }
        }
        return false;
    }

    @Override
    public void onAccelerationAccuracyChanged(final AccelerationData pAccelerationData) {

    }

    @Override
    public void onAccelerationChanged(final AccelerationData pAccelerationData) {
        final Vector2 gravity = Vector2Pool.obtain(pAccelerationData.getX(), pAccelerationData.getY());
        this.mPhysicsWorld.setGravity(gravity);
        Vector2Pool.recycle(gravity);
    }

    @Override
    public void onResumeGame() {
        super.onResumeGame();

        this.enableAccelerationSensor(this);
    }

    @Override
    public void onPauseGame() {
        super.onPauseGame();

        this.disableAccelerationSensor();
    }

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

    private void addFace(final float pX, final float pY) {
        this.mFaceCount++;
        Debug.d("Faces: " + this.mFaceCount);

        final AnimatedSprite face;
        final Body body;

        final FixtureDef objectFixtureDef = PhysicsFactory.createFixtureDef(1, 0.5f, 0.5f);

        if (this.mFaceCount % 2 == 0) {
            face = new AnimatedSprite(pX, pY, this.mCircleFaceTextureRegion, this.getVertexBufferObjectManager());
            face.setScale(MathUtils.random(0.5f, 1.25f));
            body = PhysicsFactory.createCircleBody(this.mPhysicsWorld, face, BodyDef.BodyType.DynamicBody, objectFixtureDef);
        } else {
            face = new AnimatedSprite(pX, pY, this.mBoxFaceTextureRegion, this.getVertexBufferObjectManager());
            face.setScale(MathUtils.random(0.5f, 1.25f));
            body = PhysicsFactory.createBoxBody(this.mPhysicsWorld, face, BodyDef.BodyType.DynamicBody, objectFixtureDef);
        }

        face.animate(200);

        this.mScene.attachChild(face);
        this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(face, body, true, true));
    }

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