Libgdx fail to draw sprite

Question

I am trying really hard to draw a sprite with LibGDX, but I fail. If you need more than the snippets, the source is here: https://github.com/reisi007/Planes2DLibGDX/blob/master/Main/src/com/reisisoft/Planes2D/Planes2D.java

So, what am I doing? I am loading a PNG (1024x1024) and creating sprites, which I put in a Map. This map I put in a map again (later different resolutions)

 private void putTextures(Resolutions resolutions) {
    Map<GObjects, Sprite> map;
    switch (resolutions) {
        case MidRes:
            map = new EnumMap<GObjects, Sprite>(GObjects.class);
            map.put(GObjects.PlaneR, new Sprite(txtMidRes, 0, 0, 600, 278));
            map.put(GObjects.PlaneG, new Sprite(txtMidRes, 0, 278, 600, 278));
            map.put(GObjects.PlaneB, new Sprite(txtMidRes, 0, 556, 600, 104));
            map.put(GObjects.Grass, new Sprite(txtMidRes, 0, 834, 600, 104));
            map.put(GObjects.Bullet, new Sprite(txtMidRes, 600, 834, 299, 138));
            all.put(Resolutions.MidRes, map);
            break;
    }
}

There is a function I get a sprite from the current resolutions:

private boolean setCurrentResolutions(Resolutions resolution) {
    if (resolution == null)
        return false;
    currentResolution = resolution;
    currentResolutionSprites = all.get(Resolutions.MidRes);
    return true;
}

private Sprite requestSprite(GObjects gObject) {
    return currentResolutionSprites.get(gObject);
}

I am testing the Winows build, whichs size is 800x480. The origin of the sprite I want to draw is: X 300.0 Y 139.0 The width is 300, height is 140. Next the render function:

public void render() {
    camera.update();
    spriteBatch.setProjectionMatrix(camera.combined);
    Update();
    spriteBatch.begin();
    Draw();
    spriteBatch.end();
}

As this is not really helping, here the Draw method:

public void Draw() {
    s.draw(spriteBatch);
}

What I see is just black. I tried with OpenGL 1,1.1,2 and various solution from StackOverflow

Finally the "create" method:

// On creation
public void create() {
    curH = Gdx.graphics.getHeight();
    curW = Gdx.graphics.getWidth();
    camera = new OrthographicCamera(curW, curH);
    spriteBatch = new SpriteBatch();
    // Load texture
    txtMidRes = new Texture(Gdx.files.internal("planes.png"));
    txtMidRes.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear);
    // Create Sprites for EVERY supported resolution
    putTextures(Resolutions.MidRes);
    // Set resolution according to H/W
    setCurrentResolutions(Resolutions.MidRes);
    s = requestSprite(GObjects.PlaneR);
    s.setSize(300, 140);
    s.setPosition(Gdx.graphics.getWidth() / 2 - s.getWidth() / 2,
            Gdx.graphics.getHeight() / 2 - s.getHeight() / 2);
}

Thanks for helping

Florian

Aurel Aurel · Accepted Answer · 2014-02-15T10:16:21

First of all, the link you provided to the full source doesn't match the snippets there. Maybe there is a forgotten push ?

Now some ideas on your issue :

You haven't set the camera position. Try :

camera.position.set(curH / 2f, curW / 2f, 0);
You don't need to build your sprites manually, libgdx provides features to do that. See Texture packer on the official doc.
You can also handle resolutions automatically with AssetManager. See this post for more information.

Libgdx fail to draw sprite

1 Answers