_computeLabelSizes()

in Hands-on lab/lab-files/starter-project/NorthwindMVC/wwwroot/lib/Chart.js/chart.js [5306:5349]

• 44 lines of code
• 11 McCabe index (conditional complexity)

  _computeLabelSizes(ticks, length) {
    const {ctx, _longestTextCache: caches} = this;
    const widths = [];
    const heights = [];
    let widestLabelSize = 0;
    let highestLabelSize = 0;
    let i, j, jlen, label, tickFont, fontString, cache, lineHeight, width, height, nestedLabel;
    for (i = 0; i < length; ++i) {
      label = ticks[i].label;
      tickFont = this._resolveTickFontOptions(i);
      ctx.font = fontString = tickFont.string;
      cache = caches[fontString] = caches[fontString] || {data: {}, gc: []};
      lineHeight = tickFont.lineHeight;
      width = height = 0;
      if (!isNullOrUndef(label) && !isArray(label)) {
        width = _measureText(ctx, cache.data, cache.gc, width, label);
        height = lineHeight;
      } else if (isArray(label)) {
        for (j = 0, jlen = label.length; j < jlen; ++j) {
          nestedLabel = label[j];
          if (!isNullOrUndef(nestedLabel) && !isArray(nestedLabel)) {
            width = _measureText(ctx, cache.data, cache.gc, width, nestedLabel);
            height += lineHeight;
          }
        }
      }
      widths.push(width);
      heights.push(height);
      widestLabelSize = Math.max(width, widestLabelSize);
      highestLabelSize = Math.max(height, highestLabelSize);
    }
    garbageCollect(caches, length);
    const widest = widths.indexOf(widestLabelSize);
    const highest = heights.indexOf(highestLabelSize);
    const valueAt = (idx) => ({width: widths[idx] || 0, height: heights[idx] || 0});
    return {
      first: valueAt(0),
      last: valueAt(length - 1),
      widest: valueAt(widest),
      highest: valueAt(highest),
      widths,
      heights,
    };
  }