java - Libgdx gl10.glLineWidth()

Question

I have this line: Gdx.gl10.glLineWidth(width); Now, I do intend to draw a pretty thick line, and, unfortunately when I type in small values like 1 or 5 the line is obviously small. But once I surpass soemthing like 10, it no longer gets larger. I am passing in direct values in these instances, and so, I am under the impression that GL has a limit or something.... Would I be correct? Here's my code:

Gdx.gl.glClearColor(0,0,0,1);
    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

    batch.setProjectionMatrix(cam.combined);
    batch.begin();
    batch.draw(bg,0,0,WIDTH,HEIGHT);
    for(Spell a : spells){
        a.draw(batch);
    }
    lc.draw(batch);
    batch.end();
    //((ppux+ppuy)/2f)*4
    Gdx.gl10.glLineWidth(50);//average and then say 1/4 a unit)
    renderer.setProjectionMatrix(cam.combined);
    renderer.begin(ShapeType.Line);
    lp.drawLines(renderer);
    renderer.end();
    batch.begin();
    lp.draw(batch);
    batch.end();

lp.drawLines(renderer) calls the following(I just call set color, and draw line):

renderer.setColor(1,1,1,1);
    Elem a = elems.get(spellcombo.get(0));
    Vector2 last = new Vector2(a.x(),a.y());
    for(int i = 1; i < spellcombo.size(); i++){
        a = elems.get(spellcombo.get(i));
        Vector2 cur = new Vector2(a.x(),a.y());
        renderer.line(last.x, last.y, cur.x, cur.y);
        last = cur;
    }
    renderer.line(last.x,last.y,mx,my);
    Gdx.gl.glEnable(GL10.GL_BLEND);
    Gdx.gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
    renderer.setColor(1, 0, 0, .2f);
    for(Elem e : elems){
        int id = elems.indexOf(e);
        if(ComboManager.validSpell(spellcombo,id))
            renderer.line(last.x,last.y,e.x(),e.y());
    }

Screenshots:
Image with glLineWidth() set to 1 Image with glLineWidth() set to 5 Image with glLineWidth() set to 10 Image with glLineWidth() set to 20 Image with glLineWidth() set to 200

I don't really know how to fix, and google wasn't particularily helpfull. Thanks!

Answer 1

From libgdx 1.0 on there is also the ShapeRenderer's rectLine method available. See a simple example.

ShapeRenderer shapeRenderer = new ShapeRenderer();
shapeRenderer.begin(ShapeType.Filled);
shapeRenderer.rectLine(x1, y1, x2, y2, width);
shapeRenderer.end();

That seems to be the easiest way to draw thick lines now.