import { clientToLocal } from "./event.mjs";
var GestureMgr = function() {
  function GestureMgr2() {
    this._track = [];
  }
  GestureMgr2.prototype.recognize = function(event, target, root) {
    this._doTrack(event, target, root);
    return this._recognize(event);
  };
  GestureMgr2.prototype.clear = function() {
    this._track.length = 0;
    return this;
  };
  GestureMgr2.prototype._doTrack = function(event, target, root) {
    var touches = event.touches;
    if (!touches) {
      return;
    }
    var trackItem = {
      points: [],
      touches: [],
      target,
      event
    };
    for (var i = 0, len = touches.length; i < len; i++) {
      var touch = touches[i];
      var pos = clientToLocal(root, touch, {});
      trackItem.points.push([pos.zrX, pos.zrY]);
      trackItem.touches.push(touch);
    }
    this._track.push(trackItem);
  };
  GestureMgr2.prototype._recognize = function(event) {
    for (var eventName in recognizers) {
      if (recognizers.hasOwnProperty(eventName)) {
        var gestureInfo = recognizers[eventName](this._track, event);
        if (gestureInfo) {
          return gestureInfo;
        }
      }
    }
  };
  return GestureMgr2;
}();
function dist(pointPair) {
  var dx = pointPair[1][0] - pointPair[0][0];
  var dy = pointPair[1][1] - pointPair[0][1];
  return Math.sqrt(dx * dx + dy * dy);
}
function center(pointPair) {
  return [
    (pointPair[0][0] + pointPair[1][0]) / 2,
    (pointPair[0][1] + pointPair[1][1]) / 2
  ];
}
var recognizers = {
  pinch: function(tracks, event) {
    var trackLen = tracks.length;
    if (!trackLen) {
      return;
    }
    var pinchEnd = (tracks[trackLen - 1] || {}).points;
    var pinchPre = (tracks[trackLen - 2] || {}).points || pinchEnd;
    if (pinchPre && pinchPre.length > 1 && pinchEnd && pinchEnd.length > 1) {
      var pinchScale = dist(pinchEnd) / dist(pinchPre);
      !isFinite(pinchScale) && (pinchScale = 1);
      event.pinchScale = pinchScale;
      var pinchCenter = center(pinchEnd);
      event.pinchX = pinchCenter[0];
      event.pinchY = pinchCenter[1];
      return {
        type: "pinch",
        target: tracks[0].target,
        event
      };
    }
  }
};
export {
  GestureMgr
};
