Method _updateRadius

src/controllers/controller.polarArea.js:145–157

* @private

()

	 * @private
	 */
  _updateRadius() {
    const chart = this.chart;
    const chartArea = chart.chartArea;
    const opts = chart.options;
    const minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);

    const outerRadius = Math.max(minSize / 2, 0);
    const innerRadius = Math.max(opts.cutoutPercentage ? (outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
    const radiusLength = (outerRadius - innerRadius) / chart.getVisibleDatasetCount();

    this.outerRadius = outerRadius - (radiusLength * this.index);
    this.innerRadius = this.outerRadius - radiusLength;
  }

  updateElements(arcs, start, count, mode) {
    const reset = mode === 'reset';