CoordinateConversionExample.java

package org.andengine.examples;

import org.andengine.engine.camera.Camera;
import org.andengine.engine.camera.hud.controls.AnalogOnScreenControl;
import org.andengine.engine.camera.hud.controls.AnalogOnScreenControl.IAnalogOnScreenControlListener;
import org.andengine.engine.camera.hud.controls.BaseOnScreenControl;
import org.andengine.engine.handler.physics.PhysicsHandler;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.modifier.LoopEntityModifier;
import org.andengine.entity.modifier.ScaleModifier;
import org.andengine.entity.modifier.SequenceEntityModifier;
import org.andengine.entity.primitive.Line;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.scene.background.Background;
import org.andengine.entity.sprite.Sprite;
import org.andengine.entity.util.FPSLogger;
import org.andengine.input.touch.controller.MultiTouch;
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.ITextureRegion;
import org.andengine.ui.activity.SimpleBaseGameActivity;
import org.andengine.util.math.MathUtils;

import android.opengl.GLES20;
import android.widget.Toast;

/**
 * (c) 2010 Nicolas Gramlich
 * (c) 2011 Zynga
 *
 * @author Nicolas Gramlich
 * @since 11:54:51 - 03.04.2010
 */
public class CoordinateConversionExample extends SimpleBaseGameActivity {
	// ===========================================================
	// Constants
	// ===========================================================

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

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

	private Camera mCamera;

	private BitmapTextureAtlas mBitmapTextureAtlas;
	private ITextureRegion mFaceTextureRegion;

	private Scene mScene;

	private BitmapTextureAtlas mOnScreenControlTexture;
	private ITextureRegion mOnScreenControlBaseTextureRegion;
	private ITextureRegion mOnScreenControlKnobTextureRegion;

	private boolean mPlaceOnScreenControlsAtDifferentVerticalLocations = false;

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

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

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

	@Override
	public EngineOptions onCreateEngineOptions() {
		Toast.makeText(this, "The arrow will always point to the left eye of the face!", Toast.LENGTH_LONG).show();

		this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

		final EngineOptions engineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), this.mCamera);
		engineOptions.getTouchOptions().setNeedsMultiTouch(true);

		if(MultiTouch.isSupported(this)) {
			if(MultiTouch.isSupportedDistinct(this)) {
				Toast.makeText(this, "MultiTouch detected --> Both controls will work properly!", Toast.LENGTH_SHORT).show();
			} else {
				this.mPlaceOnScreenControlsAtDifferentVerticalLocations = true;
				Toast.makeText(this, "MultiTouch detected, but your device has problems distinguishing between fingers.\n\nControls are placed at different vertical locations.", Toast.LENGTH_LONG).show();
			}
		} else {
			Toast.makeText(this, "Sorry your device does NOT support MultiTouch!\n\n(Falling back to SingleTouch.)\n\nControls are placed at different vertical locations.", Toast.LENGTH_LONG).show();
		}

		return engineOptions;
	}

	@Override
	public void onCreateResources() {
		BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");

		this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 32, 32, TextureOptions.BILINEAR);
		this.mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "face_box.png", 0, 0);
		this.mBitmapTextureAtlas.load();

		this.mOnScreenControlTexture = new BitmapTextureAtlas(this.getTextureManager(), 256, 128, TextureOptions.BILINEAR);
		this.mOnScreenControlBaseTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mOnScreenControlTexture, this, "onscreen_control_base.png", 0, 0);
		this.mOnScreenControlKnobTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mOnScreenControlTexture, this, "onscreen_control_knob.png", 128, 0);
		this.mOnScreenControlTexture.load();
	}

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

		this.mScene = new Scene();
		this.mScene.setBackground(new Background(0.09804f, 0.6274f, 0.8784f));

		/* Create three lines that will form an arrow pointing to the eye. */
		final Line arrowLineMain = new Line(0, 0, 0, 0, 3, this.getVertexBufferObjectManager());
		final Line arrowLineWingLeft = new Line(0, 0, 0, 0, 3, this.getVertexBufferObjectManager());
		final Line arrowLineWingRight = new Line(0, 0, 0, 0, 3, this.getVertexBufferObjectManager());

		arrowLineMain.setColor(1, 0, 0);
		arrowLineWingLeft.setColor(1, 0, 0);
		arrowLineWingRight.setColor(1, 0, 0);
		
		/* Create a face-sprite. */

		final float centerX = (CAMERA_WIDTH - this.mFaceTextureRegion.getWidth()) / 2;
		final float centerY = (CAMERA_HEIGHT - this.mFaceTextureRegion.getHeight()) / 2;

		final Sprite face = new Sprite(centerX, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager()) {
			@Override
			protected void onManagedUpdate(final float pSecondsElapsed) {
				super.onManagedUpdate(pSecondsElapsed);

				final float[] eyeCoordinates = this.convertLocalToSceneCoordinates(11, 13);
				final float eyeX = eyeCoordinates[VERTEX_INDEX_X];
				final float eyeY = eyeCoordinates[VERTEX_INDEX_Y];

				arrowLineMain.setPosition(eyeX, eyeY, eyeX, eyeY - 50);
				arrowLineWingLeft.setPosition(eyeX, eyeY, eyeX - 10, eyeY - 10);
				arrowLineWingRight.setPosition(eyeX, eyeY, eyeX + 10, eyeY - 10);
			}
		};
		final PhysicsHandler physicsHandler = new PhysicsHandler(face);
		face.registerUpdateHandler(physicsHandler);

		face.registerEntityModifier(new LoopEntityModifier(new SequenceEntityModifier(new ScaleModifier(3, 1, 1.75f), new ScaleModifier(3, 1.75f, 1))));

		this.mScene.attachChild(face);
		this.mScene.attachChild(arrowLineMain);
		this.mScene.attachChild(arrowLineWingLeft);
		this.mScene.attachChild(arrowLineWingRight);

		/* Velocity control (left). */
		final float x1 = 0;
		final float y1 = CAMERA_HEIGHT - this.mOnScreenControlBaseTextureRegion.getHeight();
		final AnalogOnScreenControl velocityOnScreenControl = new AnalogOnScreenControl(x1, y1, this.mCamera, this.mOnScreenControlBaseTextureRegion, this.mOnScreenControlKnobTextureRegion, 0.1f, this.getVertexBufferObjectManager(), new IAnalogOnScreenControlListener() {
			@Override
			public void onControlChange(final BaseOnScreenControl pBaseOnScreenControl, final float pValueX, final float pValueY) {
				physicsHandler.setVelocity(pValueX * 100, pValueY * 100);
			}

			@Override
			public void onControlClick(final AnalogOnScreenControl pAnalogOnScreenControl) {
				/* Nothing. */
			}
		});
		velocityOnScreenControl.getControlBase().setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
		velocityOnScreenControl.getControlBase().setAlpha(0.5f);

		this.mScene.setChildScene(velocityOnScreenControl);


		/* Rotation control (right). */
		final float y2 = (this.mPlaceOnScreenControlsAtDifferentVerticalLocations) ? 0 : y1;
		final float x2 = CAMERA_WIDTH - this.mOnScreenControlBaseTextureRegion.getWidth();
		final AnalogOnScreenControl rotationOnScreenControl = new AnalogOnScreenControl(x2, y2, this.mCamera, this.mOnScreenControlBaseTextureRegion, this.mOnScreenControlKnobTextureRegion, 0.1f, this.getVertexBufferObjectManager(), new IAnalogOnScreenControlListener() {
			@Override
			public void onControlChange(final BaseOnScreenControl pBaseOnScreenControl, final float pValueX, final float pValueY) {
				if(pValueX == x1 && pValueY == x1) {
					face.setRotation(x1);
				} else {
					face.setRotation(MathUtils.radToDeg((float)Math.atan2(pValueX, -pValueY)));
				}
			}

			@Override
			public void onControlClick(final AnalogOnScreenControl pAnalogOnScreenControl) {
				/* Nothing. */
			}
		});
		rotationOnScreenControl.getControlBase().setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
		rotationOnScreenControl.getControlBase().setAlpha(0.5f);

		velocityOnScreenControl.setChildScene(rotationOnScreenControl);

		return this.mScene;
	}

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

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