# all files / ol/interaction/ pinchrotateinteraction.js

36.92% Statements 24/65
22.73% Branches 5/22
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36.92% Lines 24/65

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

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

    /**
     * @classdesc
     * Allows the user to rotate the map by twisting with two fingers
     * on a touch screen.
     *
     * @constructor
     * @extends {ol.interaction.Pointer}
     * @param {olx.interaction.PinchRotateOptions=} opt_options Options.
     * @api stable
     */
    ol.interaction.PinchRotate = function(opt_options) {

      goog.base(this, {
        handleDownEvent: ol.interaction.PinchRotate.handleDownEvent_,
        handleDragEvent: ol.interaction.PinchRotate.handleDragEvent_,
        handleUpEvent: ol.interaction.PinchRotate.handleUpEvent_
      });

      var options = opt_options || {};

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

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

      /**
       * @private
       * @type {boolean}
       */
      this.rotating_ = false;

      /**
       * @private
       * @type {number}
       */
      this.rotationDelta_ = 0.0;

      /**
       * @private
       * @type {number}
       */
      this.threshold_ = options.threshold !== undefined ? options.threshold : 0.3;

      /**
       * @private
       * @type {number}
       */
      this.duration_ = options.duration !== undefined ? options.duration : 250;

    };
    goog.inherits(ol.interaction.PinchRotate, ol.interaction.Pointer);

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @this {ol.interaction.PinchRotate}
     * @private
     */
    ol.interaction.PinchRotate.handleDragEvent_ = function(mapBrowserEvent) {
      goog.asserts.assert(this.targetPointers.length >= 2,
          'length of this.targetPointers should be greater than or equal to 2');
      var rotationDelta = 0.0;

      var touch0 = this.targetPointers[0];
      var touch1 = this.targetPointers[1];

      // angle between touches
      var angle = Math.atan2(
          touch1.clientY - touch0.clientY,
          touch1.clientX - touch0.clientX);

      if (this.lastAngle_ !== undefined) {
        var delta = angle - this.lastAngle_;
        this.rotationDelta_ += delta;
        if (!this.rotating_ &&
            Math.abs(this.rotationDelta_) > this.threshold_) {
          this.rotating_ = true;
        }
        rotationDelta = delta;
      }
      this.lastAngle_ = angle;

      var map = mapBrowserEvent.map;

      // rotate anchor point.
      // FIXME: should be the intersection point between the lines:
      //     touch0,touch1 and previousTouch0,previousTouch1
      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);

      // rotate
      if (this.rotating_) {
        var view = map.getView();
        var rotation = view.getRotation();
        map.render();
        ol.interaction.Interaction.rotateWithoutConstraints(map, view,
            rotation + rotationDelta, this.anchor_);
      }
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Stop drag sequence?
     * @this {ol.interaction.PinchRotate}
     * @private
     */
    ol.interaction.PinchRotate.handleUpEvent_ = function(mapBrowserEvent) {
      if (this.targetPointers.length < 2) {
        var map = mapBrowserEvent.map;
        var view = map.getView();
        view.setHint(ol.ViewHint.INTERACTING, -1);
        if (this.rotating_) {
          var rotation = view.getRotation();
          ol.interaction.Interaction.rotate(
              map, view, rotation, this.anchor_, this.duration_);
        }
        return false;
      } else {
        return true;
      }
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Start drag sequence?
     * @this {ol.interaction.PinchRotate}
     * @private
     */
    ol.interaction.PinchRotate.handleDownEvent_ = function(mapBrowserEvent) {
      Iif (this.targetPointers.length >= 2) {
        var map = mapBrowserEvent.map;
        this.anchor_ = null;
        this.lastAngle_ = undefined;
        this.rotating_ = false;
        this.rotationDelta_ = 0.0;
        if (!this.handlingDownUpSequence) {
          map.getView().setHint(ol.ViewHint.INTERACTING, 1);
        }
        map.render();
        return true;
      } else {
        return false;
      }
    };

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