public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0.2f, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
// tell the camera to update its matrices.
camera.update(
car.body.getPosition().x * PIXELS_PER_METER, car.body.getPosition().y * PIXELS_PER_METER);
spriteBatch.setProjectionMatrix(camera.getCombined());
if (Gdx.input.isKeyPressed(Input.Keys.UP) || Gdx.input.isTouched()) {
car.setAccelerate(Car.ACC_ACCELERATE);
} else if (Gdx.input.isKeyPressed(Input.Keys.DOWN)) {
car.setAccelerate(Car.ACC_BRAKE);
} else {
car.setAccelerate(Car.ACC_NONE);
}
if (Gdx.input.isKeyPressed(Input.Keys.LEFT) || Gdx.input.getAccelerometerY() < -2.5) {
car.setSteer(Car.STEER_HARD_LEFT);
} else if (Gdx.input.getAccelerometerY() < -1) {
car.setSteer(Car.STEER_LEFT);
} else if (Gdx.input.isKeyPressed(Input.Keys.RIGHT) || Gdx.input.getAccelerometerY() > 2.5) {
car.setSteer(Car.STEER_HARD_RIGHT);
} else if (Gdx.input.getAccelerometerY() > 1) {
car.setSteer(Car.STEER_RIGHT);
} else {
car.setSteer(Car.STEER_NONE);
}
car.update(Gdx.app.getGraphics().getDeltaTime());
/**
* Have box2d update the positions and velocities (and etc) of all tracked objects. The second
* and third argument specify the number of iterations of velocity and position tests to perform
* -- higher is more accurate but is also slower.
*/
world.step(Gdx.app.getGraphics().getDeltaTime(), 3, 3);
world.clearForces();
// draw the sprites
spriteBatch.begin();
playerSprite.setPosition(
PIXELS_PER_METER * car.body.getPosition().x - playerTexture.getRegionWidth() / 2,
PIXELS_PER_METER * car.body.getPosition().y - playerTexture.getRegionHeight() / 2);
playerSprite.setRotation((MathUtils.radiansToDegrees * car.body.getAngle()));
playerSprite.setFlip(false, true);
playerSprite.setScale(0.3f);
playerSprite.draw(spriteBatch);
spriteBatch.end();
/** Draw this last, so we can see the collision boundaries on top of the sprites and map. */
debugRenderer.render(
world, camera.getCombined().scale(PIXELS_PER_METER, PIXELS_PER_METER, PIXELS_PER_METER));
}
public void onCreate() {
// load texture files
ImageCache.load("cars.atlas");
// Box2d World init
world = new World(new Vector2(0.0f, 0.0f), true);
this.car = new Car(world, 1, 2, new Vector2(10, 10), (float) Math.PI, 60, 15, 25, 100);
// create the camera
camera = new CameraHelper(VIRTUAL_WIDTH, VIRTUAL_HEIGHT);
/**
* Now that we have the height/width of the viewport, we can set the height/width of the world.
*/
worldWidth = camera.getViewportWidth() / PIXELS_PER_METER;
worldHeight = camera.getViewportHeight() / PIXELS_PER_METER;
// create the sprite for the player car
playerTexture = ImageCache.getTexture("car_red");
playerSprite = new Sprite(playerTexture);
playerSprite.setPosition(
PIXELS_PER_METER * car.body.getPosition().x - playerTexture.getRegionWidth() / 2,
PIXELS_PER_METER * car.body.getPosition().y - playerTexture.getRegionHeight() / 2);
spriteBatch = new SpriteBatch();
debugRenderer = new Box2DDebugRenderer();
Vector2 center = new Vector2(worldWidth / 2, worldHeight / 2);
// pen in the center
BoxProp pen1 = new BoxProp(world, 1, 6, new Vector2(center.x - 3, center.y));
BoxProp pen2 = new BoxProp(world, 1, 6, new Vector2(center.x + 3, center.y));
BoxProp pen3 = new BoxProp(world, 5, 1, new Vector2(center.x, center.y + 2.5f));
// outer walls
BoxProp wall1 = new BoxProp(world, worldWidth, 1, new Vector2(worldWidth / 2, 0.5f)); // bottom
BoxProp wall2 =
new BoxProp(world, 1, worldHeight - 2, new Vector2(0.5f, worldHeight / 2)); // left
BoxProp wall3 =
new BoxProp(world, worldWidth, 1, new Vector2(worldWidth / 2, worldHeight + 100)); // top
BoxProp wall4 =
new BoxProp(
world, 1, worldHeight - 2, new Vector2(worldWidth - 0.5f, worldHeight / 2)); // right
}