Function getInfoGridFromMouseTouchEvent

src/layout.js:434–460

(
    evt
  )

  var hovered;

  var getInfoGridFromMouseTouchEvent = function getInfoGridFromMouseTouchEvent(
    evt
  ) {
    var canvas = evt.currentTarget;
    var rect = canvas.getBoundingClientRect();
    var clientX;
    var clientY;
    /** Detect if touches are available */
    if (evt.touches) {
      clientX = evt.touches[0].clientX;
      clientY = evt.touches[0].clientY;
    } else {
      clientX = evt.clientX;
      clientY = evt.clientY;
    }
    var eventX = clientX - rect.left;
    var eventY = clientY - rect.top;

    var x = Math.floor((eventX * (canvas.width / rect.width || 1)) / g);
    var y = Math.floor((eventY * (canvas.height / rect.height || 1)) / g);

    if (!infoGrid[x]) {
      return null
    }

    return infoGrid[x][y];
  };

  var wordcloudhover = function wordcloudhover(evt) {
    var info = getInfoGridFromMouseTouchEvent(evt);