Function determineAlignment

src/plugins/plugin.tooltip.js:269–276

* Helper to get the alignment of a tooltip given the size

(chart, options, size)

 * Helper to get the alignment of a tooltip given the size
 */
function determineAlignment(chart, options, size) {
  const yAlign = size.yAlign || options.yAlign || determineYAlign(chart, size);

  return {
    xAlign: size.xAlign || options.xAlign || determineXAlign(chart, options, size, yAlign),
    yAlign
  };
}

function alignX(size, xAlign) {
  let {x, width} = size;