Method drawBackground

src/core/core.scale.js:1441–1449

* @protected

()

   * @protected
   */
  drawBackground() {
    const {ctx, options: {backgroundColor}, left, top, width, height} = this;
    if (backgroundColor) {
      ctx.save();
      ctx.fillStyle = backgroundColor;
      ctx.fillRect(left, top, width, height);
      ctx.restore();
    }
  }

  getLineWidthForValue(value) {
    const grid = this.options.grid;