Method drawBorder

src/core/core.scale.js:1522–1552

* @protected

()

	 * @protected
	 */
  drawBorder() {
    const {chart, ctx, options: {border, grid}} = this;
    const borderOpts = border.setContext(this.getContext());
    const axisWidth = border.display ? borderOpts.width : 0;
    if (!axisWidth) {
      return;
    }
    const lastLineWidth = grid.setContext(this.getContext(0)).lineWidth;
    const borderValue = this._borderValue;
    let x1, x2, y1, y2;

    if (this.isHorizontal()) {
      x1 = _alignPixel(chart, this.left, axisWidth) - axisWidth / 2;
      x2 = _alignPixel(chart, this.right, lastLineWidth) + lastLineWidth / 2;
      y1 = y2 = borderValue;
    } else {
      y1 = _alignPixel(chart, this.top, axisWidth) - axisWidth / 2;
      y2 = _alignPixel(chart, this.bottom, lastLineWidth) + lastLineWidth / 2;
      x1 = x2 = borderValue;
    }
    ctx.save();
    ctx.lineWidth = borderOpts.width;
    ctx.strokeStyle = borderOpts.color;

    ctx.beginPath();
    ctx.moveTo(x1, y1);
    ctx.lineTo(x2, y2);
    ctx.stroke();

    ctx.restore();
  }

  /**
	 * @protected