Method _draw

src/plugins/plugin.legend.js:283–438

* @private

()

	 * @private
	 */
  _draw() {
    const {options: opts, columnSizes, lineWidths, ctx} = this;
    const {align, labels: labelOpts} = opts;
    const defaultColor = defaults.color;
    const rtlHelper = getRtlAdapter(opts.rtl, this.left, this.width);
    const labelFont = toFont(labelOpts.font);
    const {padding} = labelOpts;
    const fontSize = labelFont.size;
    const halfFontSize = fontSize / 2;
    let cursor;

    this.drawTitle();

    // Canvas setup
    ctx.textAlign = rtlHelper.textAlign('left');
    ctx.textBaseline = 'middle';
    ctx.lineWidth = 0.5;
    ctx.font = labelFont.string;

    const {boxWidth, boxHeight, itemHeight} = getBoxSize(labelOpts, fontSize);

    // current position
    const drawLegendBox = function(x, y, legendItem) {
      if (isNaN(boxWidth) || boxWidth <= 0 || isNaN(boxHeight) || boxHeight < 0) {
        return;
      }

      // Set the ctx for the box
      ctx.save();

      const lineWidth = valueOrDefault(legendItem.lineWidth, 1);
      ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);
      ctx.lineCap = valueOrDefault(legendItem.lineCap, 'butt');
      ctx.lineDashOffset = valueOrDefault(legendItem.lineDashOffset, 0);
      ctx.lineJoin = valueOrDefault(legendItem.lineJoin, 'miter');
      ctx.lineWidth = lineWidth;
      ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);

      ctx.setLineDash(valueOrDefault(legendItem.lineDash, []));

      if (labelOpts.usePointStyle) {
        // Recalculate x and y for drawPoint() because its expecting
        // x and y to be center of figure (instead of top left)
        const drawOptions = {
          radius: boxHeight * Math.SQRT2 / 2,
          pointStyle: legendItem.pointStyle,
          rotation: legendItem.rotation,
          borderWidth: lineWidth
        };
        const centerX = rtlHelper.xPlus(x, boxWidth / 2);
        const centerY = y + halfFontSize;

        // Draw pointStyle as legend symbol
        drawPointLegend(ctx, drawOptions, centerX, centerY, labelOpts.pointStyleWidth && boxWidth);
      } else {
        // Draw box as legend symbol
        // Adjust position when boxHeight < fontSize (want it centered)
        const yBoxTop = y + Math.max((fontSize - boxHeight) / 2, 0);