Why doesn't SpriteBatch draw anything (LibGdx)?

Question

This is from day 6 of the flappy bird recreation tutorial -http://www.kilobolt.com/day-6-adding-graphics---welcome-to-the-necropolis.html

Here is the image file i am using for texture in my game. It is a 256px x 64px .png file.

enter image description here

Here is the class that I used for loading the texture and the specific TextureRegion(part of the texure) that I want the SpriteBatch to draw.

 public class AssetLoader { public static Texture texture; public static TextureRegion bg; public static void load() { texture = new Texture(Gdx.files.internal("data/texture.png")); bg = new TextureRegion(texture, 0, 0, 136, 43); } } And I call AssertLoader.load(), along with setting up game screen from public class MyGdxGame extends Game{ @Override public void create() { AssetLoader.load(); setScreen(new GameScreen()); } } And inside GameScreen.java public class GameScreen implements Screen { //delegate render task private GameRenderer renderer; public GameScreen() { float screenHeight = Gdx.graphics.getHeight(); float screenWidth = Gdx.graphics.getWidth(); float gameWidth = 136; float gameHeight = screenHeight / (screenWidth / gameWidth); renderer = new GameRenderer((int)gameHeight); } } And inside GameRederer, the class I delegate to render the game public class GameRenderer { private int gameHeight; private SpriteBatch batch; private OrthographicCamera cam; public GameRenderer(int gameHeight) { this.gameHeight = gameHeight; cam = new OrthographicCamera(); batch = new SpriteBatch(); batch.setProjectionMatrix(cam.combined); cam.setToOrtho(true, 136, gameHeight); } public void render() { Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); batch.begin(); batch.disableBlending(); batch.draw(AssetLoader.bg, 0, (gameHeight/2) + 23, 136, 43); batch.end() } }

enter image description here

What I get when I run the desktop version of the game is the black screen shown above(black because i set the background to black with these lines of code

 Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

Does anyone know why the SpritchBatch drawing isn't showing up? I extracted the texture portion of the texture I wanted with this line of code(starts from 0,0, width of 136, height of 43) - used GIMP - to find out portion to cut.

 bg = new TextureRegion(texture, 0, 0, 136, 43);

I also put a few log statements(removed them from view) to ensure that before drawing, bg's width and height were set correctly, which they were. And the issue can't be game height because I used a print statement and found that to be 204 which means that this expression, (gameHeight/2) + 23 will evaluate to 125 which is in bounds between 0 and game height.

I checked out other threads as well. My issue can't be libgdx spritebatch not rendering textures because the SpriteBatch should overwrite the background. And it can't be LibGDX: Android SpriteBatch not drawing because i am running mine on desktop, not andorid.

Ok, let me give you some general advice. I suggest you to read "Learning libGDX Game Development". It's nice book for beginners and it will give you basic knowledges about libgdx. If you don't have money you know what to do, right? Did you also tried to download source code from that tutorial? Maybe you missed something. And this is my source code github.com/nikoliazekter/JustSimpleTD . It can help you. — nikoliazekter
– nikoliazekter, Commented Dec 13, 2014 at 10:39
grimdradar22, I know it's being called because the background is the black background that I specified. — committedandroider
– committedandroider, Commented Dec 13, 2014 at 15:51
nikoliazekter, I think this tutorial series is great for beginners. But yeah, I downloaded the source code. I am still trying to find the discrepancy — committedandroider
– committedandroider, Commented Dec 13, 2014 at 16:00
Note that the tutorial is for an older version of libgdx than the current one. You would have to fix some other things along the way. — dawez
– dawez, Commented Dec 23, 2014 at 23:52

Angel Angel · Accepted Answer · 2014-12-13 16:33:07Z

2

could be that you have to first put cam.setToOrtho(true, 136, gameHeight);before the batch, so I can not confirm hopefully help

 public GameRenderer(int gameHeight) { this.gameHeight = gameHeight; cam = new OrthographicCamera(); batch = new SpriteBatch(); cam.setToOrtho(true, 136, gameHeight); batch.setProjectionMatrix(cam.combined); }

answered Dec 13, 2014 at 16:33

Angel Angel

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2 Comments

committedandroider Over a year ago

That was the issue:) You know why though? It's the same camera

Angel Angel Over a year ago

@committedandroider when you call, builder camera, then calling, setProjectionMatrix (cam.combined);, and then redefine the camera when you say, cam.setToOrtho (true, 136, gameHeight); assign a matrix but after the change hope it is, to what you mean and I explained well

committedandroider · Accepted Answer · 2014-12-13 16:30:50Z

If anyone's having a similar issue, the way I solved the problem was to call

 batch.setProjectionMatrix(cam.combined);

after

 cam.setToOrtho(true, 136, gameHeight);

Which didn't really make sense to me because it's still the same Matrix4 in Camera.java, that is

 public final Matrix4 combined = new Matrix4();

Was hoping someone else could clarify that.

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