Function getNearestRadialItems

src/core/core.interaction.js:142–156

* Helper function to get the items nearest to the event position for a radial chart * @param {Chart} chart - the chart to look at elements from * @param {Point} position - the point to be nearest to, in relative coordinates * @param {string} axis - the axes along which to measure distance * @par

(chart, position, axis, useFinalPosition)

 * @return {InteractionItem[]} the nearest items
 */
function getNearestRadialItems(chart, position, axis, useFinalPosition) {
  let items = [];

  function evaluationFunc(element, datasetIndex, index) {
    const {startAngle, endAngle} = element.getProps(['startAngle', 'endAngle'], useFinalPosition);
    const {angle} = getAngleFromPoint(element, {x: position.x, y: position.y});

    if (_angleBetween(angle, startAngle, endAngle)) {
      items.push({element, datasetIndex, index});
    }
  }

  evaluateInteractionItems(chart, axis, position, evaluationFunc);
  return items;
}

/**
 * Helper function to get the items nearest to the event position for a cartesian chart