Function positionIsHorizontal

src/core/core.controller.js:21–23

(position, axis)

const KNOWN_POSITIONS = ['top', 'bottom', 'left', 'right', 'chartArea'];
function positionIsHorizontal(position, axis) {
  return position === 'top' || position === 'bottom' || (KNOWN_POSITIONS.indexOf(position) === -1 && axis === 'x');
}

function compare2Level(l1, l2) {
  return function(a, b) {