152 lines
4.1 KiB
JavaScript
152 lines
4.1 KiB
JavaScript
goog.provide('ol.interaction.DragRotateAndZoom');
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goog.require('goog.asserts');
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goog.require('goog.math.Vec2');
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goog.require('ol');
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goog.require('ol.ViewHint');
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goog.require('ol.events.ConditionType');
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goog.require('ol.events.condition');
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goog.require('ol.interaction.Interaction');
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goog.require('ol.interaction.Pointer');
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/**
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* @classdesc
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* Allows the user to zoom and rotate the map by clicking and dragging
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* on the map. By default, this interaction is limited to when the shift
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* key is held down.
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*
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* This interaction is only supported for mouse devices.
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*
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* And this interaction is not included in the default interactions.
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*
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* @constructor
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* @extends {ol.interaction.Pointer}
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* @param {olx.interaction.DragRotateAndZoomOptions=} opt_options Options.
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* @api stable
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*/
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ol.interaction.DragRotateAndZoom = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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goog.base(this, {
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handleDownEvent: ol.interaction.DragRotateAndZoom.handleDownEvent_,
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handleDragEvent: ol.interaction.DragRotateAndZoom.handleDragEvent_,
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handleUpEvent: ol.interaction.DragRotateAndZoom.handleUpEvent_
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});
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/**
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* @private
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* @type {ol.events.ConditionType}
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*/
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this.condition_ = goog.isDef(options.condition) ?
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options.condition : ol.events.condition.shiftKeyOnly;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.lastAngle_ = undefined;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.lastMagnitude_ = undefined;
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/**
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* @private
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* @type {number}
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*/
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this.lastScaleDelta_ = 0;
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};
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goog.inherits(ol.interaction.DragRotateAndZoom,
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ol.interaction.Pointer);
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/**
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* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
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* @this {ol.interaction.DragRotateAndZoom}
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* @private
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*/
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ol.interaction.DragRotateAndZoom.handleDragEvent_ = function(mapBrowserEvent) {
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if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
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return;
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}
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var map = mapBrowserEvent.map;
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var size = map.getSize();
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var offset = mapBrowserEvent.pixel;
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var delta = new goog.math.Vec2(
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offset[0] - size[0] / 2,
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size[1] / 2 - offset[1]);
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var theta = Math.atan2(delta.y, delta.x);
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var magnitude = delta.magnitude();
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var view = map.getView();
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var viewState = view.getState();
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map.render();
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if (goog.isDef(this.lastAngle_)) {
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var angleDelta = theta - this.lastAngle_;
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ol.interaction.Interaction.rotateWithoutConstraints(
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map, view, viewState.rotation - angleDelta);
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}
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this.lastAngle_ = theta;
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if (goog.isDef(this.lastMagnitude_)) {
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var resolution = this.lastMagnitude_ * (viewState.resolution / magnitude);
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ol.interaction.Interaction.zoomWithoutConstraints(map, view, resolution);
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}
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if (goog.isDef(this.lastMagnitude_)) {
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this.lastScaleDelta_ = this.lastMagnitude_ / magnitude;
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}
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this.lastMagnitude_ = magnitude;
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};
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/**
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* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
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* @return {boolean} Stop drag sequence?
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* @this {ol.interaction.DragRotateAndZoom}
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* @private
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*/
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ol.interaction.DragRotateAndZoom.handleUpEvent_ = function(mapBrowserEvent) {
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if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
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return true;
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}
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var map = mapBrowserEvent.map;
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var view = map.getView();
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view.setHint(ol.ViewHint.INTERACTING, -1);
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var viewState = view.getState();
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var direction = this.lastScaleDelta_ - 1;
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ol.interaction.Interaction.rotate(map, view, viewState.rotation);
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ol.interaction.Interaction.zoom(map, view, viewState.resolution,
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undefined, ol.DRAGROTATEANDZOOM_ANIMATION_DURATION,
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direction);
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this.lastScaleDelta_ = 0;
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return false;
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};
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/**
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* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
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* @return {boolean} Start drag sequence?
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* @this {ol.interaction.DragRotateAndZoom}
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* @private
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*/
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ol.interaction.DragRotateAndZoom.handleDownEvent_ = function(mapBrowserEvent) {
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if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
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return false;
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}
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if (this.condition_(mapBrowserEvent)) {
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mapBrowserEvent.map.getView().setHint(ol.ViewHint.INTERACTING, 1);
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this.lastAngle_ = undefined;
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this.lastMagnitude_ = undefined;
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return true;
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} else {
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return false;
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}
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};
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