# all files / ol/interaction/ pinchzoom.js

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     goog.provide('ol.interaction.PinchZoom');

    goog.require('ol');
    goog.require('ol.ViewHint');
    goog.require('ol.functions');
    goog.require('ol.interaction.Interaction');
    goog.require('ol.interaction.Pointer');

    /**
     * @classdesc
     * Allows the user to zoom the map by pinching with two fingers
     * on a touch screen.
     *
     * @constructor
     * @extends {ol.interaction.Pointer}
     * @param {olx.interaction.PinchZoomOptions=} opt_options Options.
     * @api
     */
    ol.interaction.PinchZoom = function(opt_options) {

      ol.interaction.Pointer.call(this, {
        handleDownEvent: ol.interaction.PinchZoom.handleDownEvent_,
        handleDragEvent: ol.interaction.PinchZoom.handleDragEvent_,
        handleUpEvent: ol.interaction.PinchZoom.handleUpEvent_
      });

      var options = opt_options ? opt_options : {};

      /**
       * @private
       * @type {boolean}
       */
      this.constrainResolution_ = options.constrainResolution || false;

      /**
       * @private
       * @type {ol.Coordinate}
       */
      this.anchor_ = null;

      /**
       * @private
       * @type {number}
       */
      this.duration_ = options.duration !== undefined ? options.duration : 400;

      /**
       * @private
       * @type {number|undefined}
       */
      this.lastDistance_ = undefined;

      /**
       * @private
       * @type {number}
       */
      this.lastScaleDelta_ = 1;

    };
    ol.inherits(ol.interaction.PinchZoom, ol.interaction.Pointer);

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @this {ol.interaction.PinchZoom}
     * @private
     */
    ol.interaction.PinchZoom.handleDragEvent_ = function(mapBrowserEvent) {
      var scaleDelta = 1.0;

      var touch0 = this.targetPointers[0];
      var touch1 = this.targetPointers[1];
      var dx = touch0.clientX - touch1.clientX;
      var dy = touch0.clientY - touch1.clientY;

      // distance between touches
      var distance = Math.sqrt(dx * dx + dy * dy);

      if (this.lastDistance_ !== undefined) {
        scaleDelta = this.lastDistance_ / distance;
      }
      this.lastDistance_ = distance;

      var map = mapBrowserEvent.map;
      var view = map.getView();
      var resolution = view.getResolution();
      var maxResolution = view.getMaxResolution();
      var minResolution = view.getMinResolution();
      var newResolution = resolution * scaleDelta;
      if (newResolution > maxResolution) {
        scaleDelta = maxResolution / resolution;
        newResolution = maxResolution;
      } else if (newResolution < minResolution) {
        scaleDelta = minResolution / resolution;
        newResolution = minResolution;
      }

      if (scaleDelta != 1.0) {
        this.lastScaleDelta_ = scaleDelta;
      }

      // scale anchor point.
      var viewportPosition = map.getViewport().getBoundingClientRect();
      var centroid = ol.interaction.Pointer.centroid(this.targetPointers);
      centroid[0] -= viewportPosition.left;
      centroid[1] -= viewportPosition.top;
      this.anchor_ = map.getCoordinateFromPixel(centroid);

      // scale, bypass the resolution constraint
      map.render();
      ol.interaction.Interaction.zoomWithoutConstraints(view, newResolution, this.anchor_);
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Stop drag sequence?
     * @this {ol.interaction.PinchZoom}
     * @private
     */
    ol.interaction.PinchZoom.handleUpEvent_ = function(mapBrowserEvent) {
      if (this.targetPointers.length < 2) {
        var map = mapBrowserEvent.map;
        var view = map.getView();
        view.setHint(ol.ViewHint.INTERACTING, -1);
        var resolution = view.getResolution();
        if (this.constrainResolution_ ||
            resolution < view.getMinResolution() ||
            resolution > view.getMaxResolution()) {
          // Zoom to final resolution, with an animation, and provide a
          // direction not to zoom out/in if user was pinching in/out.
          // Direction is > 0 if pinching out, and < 0 if pinching in.
          var direction = this.lastScaleDelta_ - 1;
          ol.interaction.Interaction.zoom(view, resolution,
              this.anchor_, this.duration_, direction);
        }
        return false;
      } else {
        return true;
      }
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Start drag sequence?
     * @this {ol.interaction.PinchZoom}
     * @private
     */
    ol.interaction.PinchZoom.handleDownEvent_ = function(mapBrowserEvent) {
      Iif (this.targetPointers.length >= 2) {
        var map = mapBrowserEvent.map;
        this.anchor_ = null;
        this.lastDistance_ = undefined;
        this.lastScaleDelta_ = 1;
        if (!this.handlingDownUpSequence) {
          map.getView().setHint(ol.ViewHint.INTERACTING, 1);
        }
        return true;
      } else {
        return false;
      }
    };

    /**
     * @inheritDoc
     */
    ol.interaction.PinchZoom.prototype.shouldStopEvent = ol.functions.FALSE;