docs: public Surface fillRect (float x, float y, float width, float height) {
      if (patternTex != null) {
        batch.addQuad(patternTex, tint, tx(), x, y, width, height);
      } else {
        batch.addQuad(colorTex, Tint.combine(fillColor, tint), tx(), x, y, width, height);
      }
      return this;
    }