I have a player setup with box2d and I am trying to draw a sprite over the player. The player spawns in the middle of the screen, while the sprite spawns in the lower left hand corner of the screen but does move along with the player entity, just starting at a different location.
GameScreen snippet:
#Override
public void render(float delta) {
super.render(delta);
player.update();
world.step(TIMESTEP, VELOCITY_ITERATIONS, POSITION_ITERATIONS);
}
#Override
public void show() {
player = new Player(world, 0, 0);
}
Player class snippet:
public Player(World world, float x, float y) {
texture = new Texture(Gdx.files.internal("sprites/Player.png"));
sprite = new Sprite(texture);
}
public void update() {
batch = new SpriteBatch();
batch.begin();
sprite.draw();
sprite.setPosition(body.getPosition().x, body.getPosition().y);
batch.end();
body.setLinearVelocity(impulse);
}
I tried setting the position of the sprite in the constructor based on the body's coordinates but it doesn't seem to be working. I have removed body & fixture code. Any push in the right direction is appreciated.
If you enable box2d debug render, you'll probably find that both the texture and the body are starting at the left corner of the screen. Actually, 0, 0 are supposed to be the coordinates for the left bottom corner. In order to set your body in the center of the screen, you should set something like
(SCREEN_WIDTH / 2) / PTM_RATIO, (SCREEN_HEIGHT / 2) / PTM_RATIO
as your body initial position.
Related
I have a bug object that I want to move across the screen as soon as the game starts. The bug starts from the bottom left of the screen and is supposed to move to the top right and stop. What I have is the bug never really gets to the top right because the game screen(X and Y) size are not equal. How do I make the bug move to that position?
This is what I have.
public void create() {
spriteBatch = new SpriteBatch();
bug = new Sprite(new Texture("EnemyBug.png"));
bug.setSize(50, 85);
bug.setPosition(0,0);
}
public void render() {
xdeg++;
ydeg++;
Gdx.gl.glClearColor(0.7f, 0.7f, 0.2f, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
spriteBatch.begin();
bug.translate(xdeg, ydeg);
bug.draw(spriteBatch);
spriteBatch.end();
}
I'll assume that you know your window width (W) and height (H). First find the W / H ratio:
float ratio = screenWidth / screenHeight;
Then update your bug position accordingly:
bug.translate(ratio, 1);
This will make the sprite move through the screen diagonal.
pretty much i want my texture to move to a random position on the screen when its touched and when its missed i want to system.out("missed"). I cant figure out how to see if its touched. right now i can only get if the screen is touch and it records about 10 touches for every one touch because it renders so fast.
public void render(float delta) {
Gdx.gl.glClearColor(0,1,0,1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
game.batch.setProjectionMatrix(camera.combined);
game.batch.begin();
if(Gdx.input.isTouched()) {
int randomX2 = (int)MathUtils.random(100,500);
int randomY2 = (int)MathUtils.random(100,500);
game.batch.draw(boxImage, randomX2, randomY2);
}
game.batch.end();
}
If randomX2 and randomY2 are your coordinates for the texture, you can check with this code:
Rectangle bounds = new Rectangle(randomX2, randomY2, boxImage.getWidth(), boxImage.getHeight());
Vector3 tmp = new Vector3(Gdx.input.getX(), Gdx.input.getY(), 0);
camera.unproject(tmp);
if (bounds.contains(tmp.x, tmp.y)) {
System.out.println("Is touched");
}
I could solve this without using Vector3.
var upArrowCircle = Circle(randomX, randomY, radius)
if(upArrowCircle.contains(Gdx.input.getX().toFloat(), Gdx.input.getY().toFloat()))
{
Gdx.app.log("upArrow", "contains")
}
For me it works perfectly.
I'm creating a 3D game but I don't know how to translate the camera according to my fingers. I'm creating a map(x = -30 to +30;y = -30 to 30;z = -1 to 1) where every coordinate is used for a model using .g3db files from my assets and put in place using model translation. This works so far, the map looks good and is viewed in a 67% angle. The map is so large it can't be viewed in the camera at once(no I don't want to zoom out). Whenever I'm touching the screen of my android phone it's just rotating around the center, but instead I want the gamemap to stay in place from my point of view and instead change the position of the perspective camera on the x and y axis. There's no game object that can be used for position tracking, everything should be depending on my finger actions. This way I want to move to visible screen to each x and y direction(think of it visualy like a 2D camera moving up, down and to the sides in front of a picture). Can you help me?
This is my code so far:
public class MyGdxGame extends ApplicationAdapter implements ApplicationListener{
//define variables
...
#Override
public void create() {
environment = new Environment();
environment.set(new ColorAttribute(ColorAttribute.AmbientLight, 0.4f, 0.4f, 0.4f, 1f));
environment.add(new DirectionalLight().set(0.8f, 0.8f, 0.8f, -1f, -0.8f, -0.2f));
modelBatch = new ModelBatch();
cam = new PerspectiveCamera(67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
cam.position.set(10f, 10f, 10f);
cam.lookAt(0,0,0);
cam.near = 1f;
cam.far = 300f;
cam.update();
assets = new AssetManager();
//load assets
...
loading = true;
camController = new CameraInputController(cam);
camController.forwardTarget = true;
Gdx.input.setInputProcessor(camController);
}
private void doneLoading() {
//load models and add them to instances
loading = false
}
#Override
public void render() {
if (loading && assets.update())
doneLoading();
camController.update();
Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);
modelBatch.begin(cam);
modelBatch.render(instances, environment);
modelBatch.end();
}
I'm using the spring tool suite 3.5.1 as IDE and libgdx 1.0.1
Dont use a CameraInputController, but instead implement InputProcessor and use that class in the call to Gdx.input.setInputProcessor.
For example:
public class MyGdxGame extends ApplicationAdapter implements InputProcessor {
And in the create method:
Gdx.input.setInputProcessor(this);
You'll have to implement all methods as shown in this link, except for the touchDown and touchDragged method which require additional code:
private int dragX, dragY;
#Override
public boolean touchDown (int x, int y, int pointer, int button) {
dragX = x;
dragY = y;
return true;
}
#Override
public boolean touchDragged (int x, int y, int pointer) {
float dX = (float)(x-dragX)/(float)Gdx.graphics.getWidth();
float dY = (float)(dragY-y)/(float)Gdx.graphics.getHeight();
dragX = x;
dragY = y;
cam.position.add(dX * 10f, dY * 10f, 0f);
cam.update();
return true;
}
Here the dX and dY values is the amount that user has dragged on the screen within the range between -1f and +1f. E.g. for dX a value of 0.5f means that the user dragged half the screen size to the right. Note that these are delta values since the last time the method was called. The method is likely to be called many times per drag operation. Therefor, the dX and dY will be small values.
The call to cam.position.add(...) will actually move the camera and the call to cam.update(); will recalculate the values needed for rendering. I've used a multiplier of 10f for both the X and Y translation of the camera. This means that if the user fully drags from the left edge to the right edge of the screen, that the camera will move a total amount of 10 units to the right. You can adjust the value as needed.
Note that this moves the camera on XY plane. If you need to move on e.g. the XZ plane, you need to adjust the call the cam.position.add(...) accordingly. Also, this doesn't change the direction of the camera. If you want to move the camera, while looking at the same location, you'll need to add cam.lookAt(0,0,0); just before cam.update();.
I've been trying to create a game where there's a person falling. The size of my background texture is 480x3200, and I'm trying to create the game so that the camera keeps the person in the middle of the screen while falling down, and then stops at the bottom. But I can't get my background is extend beyond the screen it starts in, and then be able to see the rest of the image.
All of my code does right now is scale down the 480x3200 image down to fit onto my current screen (which I set to be 480x800), and then as the person falls, the background doesn't change.
Here's my WorldRenderer class where I've tried to do different things but every time, I can never get the person to see a different part of the image when it starts moving down.
public WorldRenderer(SpriteBatch b, World w) {
this.world = w;
this.cam = new OrthographicCamera(CAMERA_WIDTH, CAMERA_HEIGHT);
this.cam.position.set(CAMERA_WIDTH / 2, Person.position.y,0);
this.cam.setToOrtho(false, CAMERA_WIDTH, CAMERA_HEIGHT);
this.cam.update();
spriteBatch = b;
loadTextures();
}
public void render(float delta) {
person = world.getPerson();
moveCamera();
cam.update();
spriteBatch.setProjectionMatrix(cam.combined);
spriteBatch.disableBlending();
spriteBatch.begin();
renderBackground();
spriteBatch.end();
spriteBatch.enableBlending();
spriteBatch.begin();
renderObjects();
spriteBatch.end();
}
private void moveCamera() {
cam.position.set(cam.position.x, Person.position.y, 0);
cam.update();
}
private void renderObjects() {
renderPerson();
renderBlocks();
renderPlatforms();
}
private void renderBackground() {
spriteBatch.draw(backgroundTexture, cam.position.x - CAMERA_WIDTH / 2, cam.position.y - CAMERA_HEIGHT / 2, CAMERA_WIDTH, CAMERA_HEIGHT);
}
}
Does anyone have any suggestions?
Edit:
Thanks, I changed the draw in renderBackground to
spriteBatch.draw(backgroundTexture,0,0, CAMERA_WIDTH, CAMERA_HEIGHT * 4); and it works now.
spriteBatch.draw(backgroundTexture, cam.position.x - CAMERA_WIDTH / 2,
cam.position.y - CAMERA_HEIGHT / 2, CAMERA_WIDTH, CAMERA_HEIGHT);
This code is drawing the background image relative to the camera's position. That's why changing the camera's position has no effect on the background image's position. Change it to something like this:
spriteBatch.draw(backgroundTexture,0,0);
Or u can simply use ParrallaxBackground and ParrallaxLayer class
This way u dont have to manage ur camera
Its done in an optimized manner in the mentioned class.
I have a libgdx aplication, where i created a maze that consists of cubes.
When I render the bottom blue and the top red face, bottom one is rendered in front of the top face. Both faces have the same normal vector.
Could I have switched far and near clipping plane ?
Here is how I set up the camera:
public PerspectiveCamera updateCamera() {
if (camera == null) {
float aspectRatio = Gdx.graphics.getWidth() / Gdx.graphics.getHeight();
camera = new PerspectiveCamera(67f, aspectRatio, 1);
this.setActive(true);
}
return camera;
}
I just forgot to add depth testing.
Added to create() method:
Gdx.gl.glEnable(GL10.GL_DEPTH_TEST);
Gdx.gl.glDepthFunc(GL10.GL_LESS);
Added to render() method:
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);