# all files / ol/interaction/ dragrotateinteraction.js

41.67% Statements 20/48
22.22% Branches 4/18
50% Functions 2/4
41.67% Lines 20/48

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

    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 rotate the map by clicking and dragging on the map,
     * normally combined with an {@link ol.events.condition} that limits
     * it to when the alt and shift keys are held down.
     *
     * This interaction is only supported for mouse devices.
     *
     * @constructor
     * @extends {ol.interaction.Pointer}
     * @param {olx.interaction.DragRotateOptions=} opt_options Options.
     * @api stable
     */
    ol.interaction.DragRotate = function(opt_options) {

      var options = opt_options ? opt_options : {};

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

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

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

      /**
       * @private
       * @type {number}
       */
      this.duration_ = options.duration !== undefined ? options.duration : 250;
    };
    goog.inherits(ol.interaction.DragRotate, ol.interaction.Pointer);

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

      var map = mapBrowserEvent.map;
      var size = map.getSize();
      var offset = mapBrowserEvent.pixel;
      var theta =
          Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);
      if (this.lastAngle_ !== undefined) {
        var delta = theta - this.lastAngle_;
        var view = map.getView();
        var rotation = view.getRotation();
        map.render();
        ol.interaction.Interaction.rotateWithoutConstraints(
            map, view, rotation - delta);
      }
      this.lastAngle_ = theta;
    };

    /**
     * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
     * @return {boolean} Stop drag sequence?
     * @this {ol.interaction.DragRotate}
     * @private
     */
    ol.interaction.DragRotate.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 rotation = view.getRotation();
      ol.interaction.Interaction.rotate(map, view, rotation,
          undefined, this.duration_);
      return false;
    };

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

      if (ol.events.condition.mouseActionButton(mapBrowserEvent) &&
          this.condition_(mapBrowserEvent)) {
        var map = mapBrowserEvent.map;
        map.getView().setHint(ol.ViewHint.INTERACTING, 1);
        map.render();
        this.lastAngle_ = undefined;
        return true;
      } else {
        return false;
      }
    };

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