# all files / ol/interaction/ dragrotateandzoominteraction.js

32.76% Statements 19/58
15% Branches 3/20
25% Functions 1/4
32.76% Lines 19/58

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

    goog.require('ol');
    goog.require('ol.ViewHint');
    goog.require('ol.events.ConditionType');
    goog.require('ol.events.condition');
    goog.require('ol.interaction.Interaction');
    goog.require('ol.interaction.Pointer');

    /**
     * @classdesc
     * Allows the user to zoom and rotate the map by clicking and dragging
     * on the map.  By default, this interaction is limited to when the shift
     * key is held down.
     *
     * This interaction is only supported for mouse devices.
     *
     * And this interaction is not included in the default interactions.
     *
     * @constructor
     * @extends {ol.interaction.Pointer}
     * @param {olx.interaction.DragRotateAndZoomOptions=} opt_options Options.
     * @api stable
     */
    ol.interaction.DragRotateAndZoom = function(opt_options) {

      var options = opt_options ? opt_options : {};

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

      /**
       * @private
       * @type {ol.events.ConditionType}
       */
      this.condition_ = options.condition ?
          options.condition : ol.events.condition.shiftKeyOnly;

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

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

      /**
       * @private
       * @type {number}
       */
      this.lastScaleDelta_ = 0;

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

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

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @this {ol.interaction.DragRotateAndZoom}
     * @private
     */
    ol.interaction.DragRotateAndZoom.handleDragEvent_ = function(mapBrowserEvent) {
      if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
        return;
      }

      var map = mapBrowserEvent.map;
      var size = map.getSize();
      var offset = mapBrowserEvent.pixel;
      var deltaX = offset[0] - size[0] / 2;
      var deltaY = size[1] / 2 - offset[1];
      var theta = Math.atan2(deltaY, deltaX);
      var magnitude = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
      var view = map.getView();
      map.render();
      if (this.lastAngle_ !== undefined) {
        var angleDelta = theta - this.lastAngle_;
        ol.interaction.Interaction.rotateWithoutConstraints(
            map, view, view.getRotation() - angleDelta);
      }
      this.lastAngle_ = theta;
      if (this.lastMagnitude_ !== undefined) {
        var resolution = this.lastMagnitude_ * (view.getResolution() / magnitude);
        ol.interaction.Interaction.zoomWithoutConstraints(map, view, resolution);
      }
      if (this.lastMagnitude_ !== undefined) {
        this.lastScaleDelta_ = this.lastMagnitude_ / magnitude;
      }
      this.lastMagnitude_ = magnitude;
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Stop drag sequence?
     * @this {ol.interaction.DragRotateAndZoom}
     * @private
     */
    ol.interaction.DragRotateAndZoom.handleUpEvent_ = function(mapBrowserEvent) {
      if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
        return true;
      }

      var map = mapBrowserEvent.map;
      var view = map.getView();
      view.setHint(ol.ViewHint.INTERACTING, -1);
      var direction = this.lastScaleDelta_ - 1;
      ol.interaction.Interaction.rotate(map, view, view.getRotation());
      ol.interaction.Interaction.zoom(map, view, view.getResolution(),
          undefined, this.duration_, direction);
      this.lastScaleDelta_ = 0;
      return false;
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Start drag sequence?
     * @this {ol.interaction.DragRotateAndZoom}
     * @private
     */
    ol.interaction.DragRotateAndZoom.handleDownEvent_ = function(mapBrowserEvent) {
      if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
        return false;
      }

      if (this.condition_(mapBrowserEvent)) {
        mapBrowserEvent.map.getView().setHint(ol.ViewHint.INTERACTING, 1);
        this.lastAngle_ = undefined;
        this.lastMagnitude_ = undefined;
        return true;
      } else {
        return false;
      }
    };