title: Drawing a gradient in Libgdx
body: <p>Ok I have this code </p>
  
  <pre><code>@Override
  public void render() {
      // do not update game world when paused
      if (!paused) {
          // Update game world by the time that has passed
          // since last render frame
          worldController.update(Gdx.graphics.getDeltaTime());
      }
      // Sets the clear screen color to: Cornflower Blue
      Gdx.gl.glClearColor(0x64/255.0f, 0x95/255.0f, 0xed/255.0f,
              0xff/255.0f);
      // Clears the screen
      Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
      // Render game world to screen
      worldRenderer.render();
  }
  </code></pre>
  
  <p>And it draws a light blue background onto the screen. I am attempting to create a gradient that goes from a dark blue at the top, to a light blue towards the bottom. Is there a simple way to do this? I'm new to Libgdx, and OpenGL so i'm trying to learn from a book but I can't seem to find the answer to this one. I've heard of drawing a big square and having the vertices different colors, but I'm unsure of how to do this.</p>