I want to create moving platform that changes its orientation when its position equals width of screen, I'm doing it like this:
if(bucket.getPosition().x <= Gdx.graphics.getWidth()/PPM){
do{
bucket.setLinearVelocity(dt*PPM,0);
}while (bucket.getPosition().x <= Gdx.graphics.getWidth()/PPM);
}else{
do{
bucket.setLinearVelocity(-dt*PPM,0);
}while (bucket.getPosition().x != 0);
}
But when I run it, I see just black screen;
But when I wrote like this:
if(bucket.getPosition().x <= Gdx.graphics.getWidth()/PPM){
bucket.setLinearVelocity(dt*PPM,0);
}else{
bucket.setLinearVelocity(-dt*PPM,0);
}
All is works, but "bucket" doesn't change its orientation :((
You can use setTransform(vector2,angle) on body for your requirement and move your bucket left and right.
I've try to completed your requirement, check it.
public class GdxTest extends InputAdapter implements ApplicationListener {
private SpriteBatch batch;
private ExtendViewport extendViewport;
private OrthographicCamera cam;
private float w=20;
private float h=22;
private World world;
private Box2DDebugRenderer debugRenderer;
private Array<Body> array;
private Vector3 vector3;
private Body bucket;
Vector2 vector2;
boolean isLeft;
@Override
public void create() {
vector2=new Vector2();
isLeft=true;
cam=new OrthographicCamera();
extendViewport=new ExtendViewport(w,h,cam);
batch =new SpriteBatch();
Gdx.input.setInputProcessor(this);
world=new World(new Vector2(0,-9.8f),true);
array=new Array<Body>();
debugRenderer=new Box2DDebugRenderer();
vector3=new Vector3();
BodyDef bodyDef=new BodyDef();
bodyDef.type= BodyDef.BodyType.KinematicBody;
bodyDef.position.set(0,0);
bucket=world.createBody(bodyDef);
ChainShape chainShape=new ChainShape();
chainShape.createChain(new float[]{1,5,1,1,5,1,5,5});
FixtureDef fixtureDef=new FixtureDef();
fixtureDef.shape=chainShape;
fixtureDef.restitution=.5f;
bucket.createFixture(fixtureDef);
chainShape.dispose();
}
@Override
public void render() {
Gdx.gl.glClearColor(0,1,1,1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
world.step(1/60f,6,2);
batch.setProjectionMatrix(cam.combined);
batch.begin();
world.getBodies(array);
for (Body body:array){
if(body.getUserData()!=null) {
Sprite sprite = (Sprite) body.getUserData();
sprite.setPosition(body.getPosition().x-sprite.getWidth()/2, body.getPosition().y-sprite.getHeight()/2);
sprite.setRotation(body.getAngle()*MathUtils.radDeg);
sprite.draw(batch);
}
}
batch.end();
debugRenderer.render(world,cam.combined);
Vector2 pos=bucket.getTransform().getPosition();
vector2.set(pos.x+(isLeft?0.05f:-0.05f),pos.y);
bucket.setTransform(vector2,0);
if(pos.x>20-5)
isLeft=false;
if(pos.x<-1)
isLeft=true;
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void resize(int width, int height) {
extendViewport.update(width,height);
cam.position.x = w /2;
cam.position.y = h/2;
cam.update();
}
private void createPhysicsObject(float x,float y){
float sizeX=0.5f,sizeY=0.5f;
BodyDef bodyDef=new BodyDef();
bodyDef.position.set(x,y);
bodyDef.type= BodyDef.BodyType.DynamicBody;
Body body=world.createBody(bodyDef);
PolygonShape polygonShape=new PolygonShape();
polygonShape.setAsBox(sizeX,sizeY);
FixtureDef fixtureDef=new FixtureDef();
fixtureDef.shape=polygonShape;
fixtureDef.restitution=.2f;
fixtureDef.density=2;
body.createFixture(fixtureDef);
body.setFixedRotation(false);
polygonShape.dispose();
Sprite sprite=new Sprite(new Texture("badlogic.jpg"));
sprite.setSize(2*sizeX,2*sizeY);
sprite.setPosition(x-sprite.getWidth()/2,y-sprite.getHeight()/2);
sprite.setOrigin(sizeX,sizeY);
body.setUserData(sprite);
}
@Override
public void dispose() {
batch.dispose();
debugRenderer.dispose();
world.dispose();
}
@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {
vector3.set(screenX,screenY,0);
Vector3 position=cam.unproject(vector3);
createPhysicsObject(vector3.x,vector3.y);
return false;
}
}