buildOrUpdateScales()

in Hands-on lab/lab-files/starter-project/NorthwindMVC/wwwroot/lib/Chart.js/chart.js [6686:6744]

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

  buildOrUpdateScales() {
    const me = this;
    const options = me.options;
    const scaleOpts = options.scales;
    const scales = me.scales;
    const updated = Object.keys(scales).reduce((obj, id) => {
      obj[id] = false;
      return obj;
    }, {});
    let items = [];
    if (scaleOpts) {
      items = items.concat(
        Object.keys(scaleOpts).map((id) => {
          const scaleOptions = scaleOpts[id];
          const axis = determineAxis(id, scaleOptions);
          const isRadial = axis === 'r';
          const isHorizontal = axis === 'x';
          return {
            options: scaleOptions,
            dposition: isRadial ? 'chartArea' : isHorizontal ? 'bottom' : 'left',
            dtype: isRadial ? 'radialLinear' : isHorizontal ? 'category' : 'linear'
          };
        })
      );
    }
    each(items, (item) => {
      const scaleOptions = item.options;
      const id = scaleOptions.id;
      const axis = determineAxis(id, scaleOptions);
      const scaleType = valueOrDefault(scaleOptions.type, item.dtype);
      if (scaleOptions.position === undefined || positionIsHorizontal(scaleOptions.position, axis) !== positionIsHorizontal(item.dposition)) {
        scaleOptions.position = item.dposition;
      }
      updated[id] = true;
      let scale = null;
      if (id in scales && scales[id].type === scaleType) {
        scale = scales[id];
      } else {
        const scaleClass = registry.getScale(scaleType);
        scale = new scaleClass({
          id,
          type: scaleType,
          ctx: me.ctx,
          chart: me
        });
        scales[scale.id] = scale;
      }
      scale.init(scaleOptions, options);
    });
    each(updated, (hasUpdated, id) => {
      if (!hasUpdated) {
        delete scales[id];
      }
    });
    each(scales, (scale) => {
      layouts.configure(me, scale, scale.options);
      layouts.addBox(me, scale);
    });
  }