Function getAxisItems

src/core/core.interaction.js:228–246

* Helper function to get the items matching along the given X or Y axis * @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 axis to match * @param {boolean} [intersect] - if true,

(chart, position, axis, intersect, useFinalPosition)

 * @return {InteractionItem[]} the nearest items
 */
function getAxisItems(chart, position, axis, intersect, useFinalPosition) {
  const items = [];
  const rangeMethod = axis === 'x' ? 'inXRange' : 'inYRange';
  let intersectsItem = false;

  evaluateInteractionItems(chart, axis, position, (element, datasetIndex, index) => {
    if (element[rangeMethod] && element[rangeMethod](position[axis], useFinalPosition)) {
      items.push({element, datasetIndex, index});
      intersectsItem = intersectsItem || element.inRange(position.x, position.y, useFinalPosition);
    }
  });

  // If we want to trigger on an intersect and we don't have any items
  // that intersect the position, return nothing
  if (intersect && !intersectsItem) {
    return [];
  }
  return items;
}

/**
 * Contains interaction related functions