all files / ol/interaction/ dragrotateandzoominteraction.js

34.48% Statements 20/58
15% Branches 3/20
25% Functions 1/4
34.48% Lines 20/58
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goog.provide('ol.interaction.DragRotateAndZoom');
 
goog.require('goog.math.Vec2');
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 ? 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 delta = new goog.math.Vec2(
      offset[0] - size[0] / 2,
      size[1] / 2 - offset[1]);
  var theta = Math.atan2(delta.y, delta.x);
  var magnitude = delta.magnitude();
  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;
  }
};