I'm fooling around with Box2D and libGDX and running into a peculiar problem with polling for input. Here's the code for the Screen's render() loop:
@Override
public void render(float delta) {
Gdx.gl20.glClearColor(0, 0, .2f, 1);
Gdx.gl20.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
game.batch.setProjectionMatrix(camera.combined);
debugRenderer.render(world, camera.combined);
if(Gdx.input.isButtonPressed(Keys.LEFT)){
Gdx.app.log("Input", "Left is being pressed.");
pushyThingyBody.applyForceToCenter(-10f, 0);
}
if(Gdx.input.isButtonPressed(Keys.RIGHT)){
Gdx.app.log("Input", "Right is being pressed.");
pushyThingyBody.applyForceToCenter(10f, 0);
}
world.step((1f/45f), 6, 2);
}
And the constructor is largely just setting up the World, Box2DDebugRenderer, and all the Bodies in the world:
public SandBox(PhysicsSandboxGame game) {
this.game = game;
camera = new OrthographicCamera(800, 480);
camera.setToOrtho(false);
world = new World(new Vector2(0, -9.8f), true);
debugRenderer = new Box2DDebugRenderer();
BodyDef bodyDef = new BodyDef();
bodyDef.type = BodyType.DynamicBody;
bodyDef.position.set(100, 300);
body = world.createBody(bodyDef);
CircleShape circle = new CircleShape();
circle.setRadius(6f);
FixtureDef fixtureDef = new FixtureDef();
fixtureDef.shape = circle;
fixtureDef.density = .5f;
fixtureDef.friction = .4f;
fixtureDef.restitution = .6f;
fixture = body.createFixture(fixtureDef);
circle.dispose();
BodyDef groundBodyDef = new BodyDef();
groundBodyDef.position.set(new Vector2(0, 10));
groundBody = world.createBody(groundBodyDef);
PolygonShape groundBox = new PolygonShape();
groundBox.setAsBox(camera.viewportWidth, 10f);
groundBody.createFixture(groundBox, 0f);
groundBox.dispose();
BodyDef pushyThingyBodyDef = new BodyDef();
pushyThingyBodyDef.type = BodyType.DynamicBody;
pushyThingyBodyDef.position.set(new Vector2(400, 30));
pushyThingyBody = world.createBody(pushyThingyBodyDef);
PolygonShape pushyThingyShape = new PolygonShape();
pushyThingyShape.setAsBox(40f, 10f);
FixtureDef pushyThingyFixtureDef = new FixtureDef();
pushyThingyFixtureDef.shape = pushyThingyShape;
pushyThingyFixtureDef.density = .4f;
pushyThingyFixtureDef.friction = .1f;
pushyThingyFixtureDef.restitution = .5f;
pushyFixture = pushyThingyBody.createFixture(pushyThingyFixtureDef);
pushyThingyShape.dispose();
}
Testing this on the desktop. Basically, whenever I hit the appropriate keys, neither of the if statements in the loop return true. However, when I click in the window, both statements return true, resulting in a 0 net force on the body. Why is this?
