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POHow to move a car with a constant speed. Code for moving any object with a constant speed
 

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  1. POHow to move a car with a constant speed. Code for moving any object with a constant speed
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    <p>i just started learning on andEngine. i have taken this code from andEngine examples, i want a car to move itself in a linear direction. then i am planing to control it by sensores.but first i want a car to move automatically when game starts. may be this is very simple question for all of you, but i need ur help please</p> <pre><code>public class AndEngineTutorialActivity extends SimpleBaseGameActivity { // =========================================================== // Constants // =========================================================== private static final int RACETRACK_WIDTH = 64; private static final int OBSTACLE_SIZE = 16; private static final int CAR_SIZE = 16; static final int CAMERA_WIDTH = RACETRACK_WIDTH * 5 ; static final int CAMERA_HEIGHT = RACETRACK_WIDTH * 3; // =========================================================== // Fields // =========================================================== private Camera mCamera; AccelerometerHelper mAccelerometerHelper; private BitmapTextureAtlas mVehiclesTexture; private TiledTextureRegion mVehiclesTextureRegion; private BitmapTextureAtlas mBoxTexture; private ITextureRegion mBoxTextureRegion; private BitmapTextureAtlas mRacetrackTexture; private ITextureRegion mRacetrackStraightTextureRegion; private ITextureRegion mRacetrackCurveTextureRegion; /* private BitmapTextureAtlas mOnScreenControlTexture; private ITextureRegion mOnScreenControlBaseTextureRegion; private ITextureRegion mOnScreenControlKnobTextureRegion; */ private Scene mScene; private PhysicsWorld mPhysicsWorld; private Body mCarBody; private TiledSprite mCar; // =========================================================== // Constructors // =========================================================== // =========================================================== // Getter &amp; Setter // =========================================================== // =========================================================== // Methods for/from SuperClass/Interfaces // =========================================================== @Override public EngineOptions onCreateEngineOptions() { this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT); mAccelerometerHelper = new AccelerometerHelper(this); //AccelerometerHelper(); return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), this.mCamera); } @Override public void onCreateResources() { BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/"); this.mVehiclesTexture = new BitmapTextureAtlas(this.getTextureManager(), 128, 16, TextureOptions.BILINEAR); this.mVehiclesTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mVehiclesTexture, this, "vehicles.png", 0, 0, 6, 1); this.mVehiclesTexture.load(); this.mRacetrackTexture = new BitmapTextureAtlas(this.getTextureManager(), 128, 256, TextureOptions.REPEATING_NEAREST); this.mRacetrackStraightTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mRacetrackTexture, this, "racetrack_straight.png", 0, 0); this.mRacetrackCurveTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mRacetrackTexture, this, "racetrack_curve.png", 0, 128); this.mRacetrackTexture.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(); */ this.mBoxTexture = new BitmapTextureAtlas(this.getTextureManager(), 32, 32, TextureOptions.BILINEAR); this.mBoxTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBoxTexture, this, "box.png", 0, 0); this.mBoxTexture.load(); } @Override public Scene onCreateScene() { this.mEngine.registerUpdateHandler(new FPSLogger()); this.mScene = new Scene(); this.mScene.setBackground(new Background(0, 0, 0)); this.mPhysicsWorld = new FixedStepPhysicsWorld(30, new Vector2(0, 0), false, 8, 1); this.initRacetrack(); this.initRacetrackBorders(); this.initCar(); this.initObstacles(); // this.initOnScreenControls(); this.mScene.registerUpdateHandler(this.mPhysicsWorld); return this.mScene; } @Override public void onGameCreated() { } // =========================================================== // Methods // =========================================================== /*private void initOnScreenControls() { final AnalogOnScreenControl analogOnScreenControl = new AnalogOnScreenControl(0, CAMERA_HEIGHT - this.mOnScreenControlBaseTextureRegion.getHeight(), 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) { final Body carBody = AndEngineTutorialActivity.this.mCarBody; final Vector2 velocity = Vector2Pool.obtain(pValueX * 5, pValueY * 5); carBody.setLinearVelocity(velocity); Vector2Pool.recycle(velocity); final float rotationInRad = (float)Math.atan2(-pValueX, pValueY); carBody.setTransform(carBody.getWorldCenter(), rotationInRad); AndEngineTutorialActivity.this.mCar.setRotation(MathUtils.radToDeg(rotationInRad)); } @Override public void onControlClick(final AnalogOnScreenControl pAnalogOnScreenControl) { /* Nothing. */ //} /* }); analogOnScreenControl.getControlBase().setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA); analogOnScreenControl.getControlBase().setAlpha(0.5f); // analogOnScreenControl.getControlBase().setScaleCenter(0, 128); // analogOnScreenControl.getControlBase().setScale(0.75f); // analogOnScreenControl.getControlKnob().setScale(0.75f); analogOnScreenControl.refreshControlKnobPosition(); this.mScene.setChildScene(analogOnScreenControl); }*/ private void initCar() { this.mCar = new TiledSprite(20, 20, CAR_SIZE, CAR_SIZE, this.mVehiclesTextureRegion, this.getVertexBufferObjectManager()); this.mCar.setCurrentTileIndex(0); final FixtureDef carFixtureDef = PhysicsFactory.createFixtureDef(1, 0.5f, 0.5f); this.mCarBody = PhysicsFactory.createBoxBody(this.mPhysicsWorld, this.mCar, BodyType.DynamicBody, carFixtureDef); this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(this.mCar, this.mCarBody, true, false)); this.mScene.attachChild(this.mCar); } private void initObstacles() { this.addObstacle(CAMERA_WIDTH / 2, RACETRACK_WIDTH / 2); this.addObstacle(CAMERA_WIDTH / 2, RACETRACK_WIDTH / 2); this.addObstacle(CAMERA_WIDTH / 2, CAMERA_HEIGHT - RACETRACK_WIDTH / 2); this.addObstacle(CAMERA_WIDTH / 2, CAMERA_HEIGHT - RACETRACK_WIDTH / 2); } private void addObstacle(final float pX, final float pY) { final Sprite box = new Sprite(pX, pY, OBSTACLE_SIZE, OBSTACLE_SIZE, this.mBoxTextureRegion, this.getVertexBufferObjectManager()); final FixtureDef boxFixtureDef = PhysicsFactory.createFixtureDef(0.1f, 0.5f, 0.5f); final Body boxBody = PhysicsFactory.createBoxBody(this.mPhysicsWorld, box, BodyType.DynamicBody, boxFixtureDef); boxBody.setLinearDamping(10); boxBody.setAngularDamping(10); this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(box, boxBody, true, true)); this.mScene.attachChild(box); } private void initRacetrack() { /* Straights. */ { final ITextureRegion racetrackHorizontalStraightTextureRegion = this.mRacetrackStraightTextureRegion.deepCopy(); racetrackHorizontalStraightTextureRegion.setTextureWidth(3 * this.mRacetrackStraightTextureRegion.getWidth()); final ITextureRegion racetrackVerticalStraightTextureRegion = this.mRacetrackStraightTextureRegion; /* Top Straight */ this.mScene.attachChild(new Sprite(RACETRACK_WIDTH, 0, 3 * RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackHorizontalStraightTextureRegion, this.getVertexBufferObjectManager())); /* Bottom Straight */ this.mScene.attachChild(new Sprite(RACETRACK_WIDTH, CAMERA_HEIGHT - RACETRACK_WIDTH, 3 * RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackHorizontalStraightTextureRegion, this.getVertexBufferObjectManager())); /* Left Straight */ final Sprite leftVerticalStraight = new Sprite(0, RACETRACK_WIDTH, RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackVerticalStraightTextureRegion, this.getVertexBufferObjectManager()); leftVerticalStraight.setRotation(90); this.mScene.attachChild(leftVerticalStraight); /* Right Straight */ final Sprite rightVerticalStraight = new Sprite(CAMERA_WIDTH - RACETRACK_WIDTH, RACETRACK_WIDTH, RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackVerticalStraightTextureRegion, this.getVertexBufferObjectManager()); rightVerticalStraight.setRotation(90); this.mScene.attachChild(rightVerticalStraight); } /* Edges */ { final ITextureRegion racetrackCurveTextureRegion = this.mRacetrackCurveTextureRegion; /* Upper Left */ final Sprite upperLeftCurve = new Sprite(0, 0, RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackCurveTextureRegion, this.getVertexBufferObjectManager()); upperLeftCurve.setRotation(90); this.mScene.attachChild(upperLeftCurve); /* Upper Right */ final Sprite upperRightCurve = new Sprite(CAMERA_WIDTH - RACETRACK_WIDTH, 0, RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackCurveTextureRegion, this.getVertexBufferObjectManager()); upperRightCurve.setRotation(180); this.mScene.attachChild(upperRightCurve); /* Lower Right */ final Sprite lowerRightCurve = new Sprite(CAMERA_WIDTH - RACETRACK_WIDTH, CAMERA_HEIGHT - RACETRACK_WIDTH, RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackCurveTextureRegion, this.getVertexBufferObjectManager()); lowerRightCurve.setRotation(270); this.mScene.attachChild(lowerRightCurve); /* Lower Left */ final Sprite lowerLeftCurve = new Sprite(0, CAMERA_HEIGHT - RACETRACK_WIDTH, RACETRACK_WIDTH, RACETRACK_WIDTH, racetrackCurveTextureRegion, this.getVertexBufferObjectManager()); this.mScene.attachChild(lowerLeftCurve); } } private void initRacetrackBorders() { final VertexBufferObjectManager vertexBufferObjectManager = this.getVertexBufferObjectManager(); final Rectangle bottomOuter = new Rectangle(0, CAMERA_HEIGHT - 2, CAMERA_WIDTH, 2, vertexBufferObjectManager); final Rectangle topOuter = new Rectangle(0, 0, CAMERA_WIDTH, 2, vertexBufferObjectManager); final Rectangle leftOuter = new Rectangle(0, 0, 2, CAMERA_HEIGHT, vertexBufferObjectManager); final Rectangle rightOuter = new Rectangle(CAMERA_WIDTH - 2, 0, 2, CAMERA_HEIGHT, vertexBufferObjectManager); final Rectangle bottomInner = new Rectangle(RACETRACK_WIDTH, CAMERA_HEIGHT - 2 - RACETRACK_WIDTH, CAMERA_WIDTH - 2 * RACETRACK_WIDTH, 2, vertexBufferObjectManager); final Rectangle topInner = new Rectangle(RACETRACK_WIDTH, RACETRACK_WIDTH, CAMERA_WIDTH - 2 * RACETRACK_WIDTH, 2, vertexBufferObjectManager); final Rectangle leftInner = new Rectangle(RACETRACK_WIDTH, RACETRACK_WIDTH, 2, CAMERA_HEIGHT - 2 * RACETRACK_WIDTH, vertexBufferObjectManager); final Rectangle rightInner = new Rectangle(CAMERA_WIDTH - 2 - RACETRACK_WIDTH, RACETRACK_WIDTH, 2, CAMERA_HEIGHT - 2 * RACETRACK_WIDTH, vertexBufferObjectManager); final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0, 0.5f, 0.5f); PhysicsFactory.createBoxBody(this.mPhysicsWorld, bottomOuter, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, topOuter, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, leftOuter, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, rightOuter, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, bottomInner, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, topInner, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, leftInner, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, rightInner, BodyType.StaticBody, wallFixtureDef); this.mScene.attachChild(bottomOuter); this.mScene.attachChild(topOuter); this.mScene.attachChild(leftOuter); this.mScene.attachChild(rightOuter); this.mScene.attachChild(bottomInner); this.mScene.attachChild(topInner); this.mScene.attachChild(leftInner); this.mScene.attachChild(rightInner); } // =========================================================== // Inner and Anonymous Classes // =========================================================== } </code></pre>
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    1. USAmey Jahagirdar
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    1. CONobody's going to read giant blocks of code. Explain your problem clearly, and tell us what is happening, and what is supposed to happen. Then, provide *relevant* code.
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      1. POHow to move a car with a constant speed. Code for moving any object with a constant speed
      1. USRaghav Sood
    2. COSir i just want to move a car in a linear direction. i wanted to know about the classes and methods that move can objects
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      1. POHow to move a car with a constant speed. Code for moving any object with a constant speed
      1. USAmey Jahagirdar
 

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