130 lines
3.3 KiB
JavaScript
130 lines
3.3 KiB
JavaScript
goog.provide('ol.interaction.DragRotate');
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goog.require('ol');
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goog.require('ol.ViewHint');
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goog.require('ol.events.condition');
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goog.require('ol.functions');
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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 rotate the map by clicking and dragging on the map,
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* normally combined with an {@link ol.events.condition} that limits
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* it to when the alt and shift keys are 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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* @constructor
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* @extends {ol.interaction.Pointer}
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* @param {olx.interaction.DragRotateOptions=} opt_options Options.
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* @api stable
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*/
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ol.interaction.DragRotate = function(opt_options) {
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var options = opt_options ? opt_options : {};
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ol.interaction.Pointer.call(this, {
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handleDownEvent: ol.interaction.DragRotate.handleDownEvent_,
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handleDragEvent: ol.interaction.DragRotate.handleDragEvent_,
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handleUpEvent: ol.interaction.DragRotate.handleUpEvent_
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});
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/**
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* @private
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* @type {ol.EventsConditionType}
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*/
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this.condition_ = options.condition ?
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options.condition : ol.events.condition.altShiftKeysOnly;
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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}
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*/
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this.duration_ = options.duration !== undefined ? options.duration : 250;
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};
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ol.inherits(ol.interaction.DragRotate, ol.interaction.Pointer);
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/**
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* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
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* @this {ol.interaction.DragRotate}
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* @private
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*/
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ol.interaction.DragRotate.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 theta =
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Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);
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if (this.lastAngle_ !== undefined) {
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var delta = theta - this.lastAngle_;
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var view = map.getView();
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var rotation = view.getRotation();
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ol.interaction.Interaction.rotateWithoutConstraints(
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view, rotation - delta);
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}
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this.lastAngle_ = theta;
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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.DragRotate}
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* @private
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*/
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ol.interaction.DragRotate.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 rotation = view.getRotation();
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ol.interaction.Interaction.rotate(view, rotation,
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undefined, this.duration_);
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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.DragRotate}
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* @private
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*/
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ol.interaction.DragRotate.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 (ol.events.condition.mouseActionButton(mapBrowserEvent) &&
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this.condition_(mapBrowserEvent)) {
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var map = mapBrowserEvent.map;
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map.getView().setHint(ol.ViewHint.INTERACTING, 1);
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this.lastAngle_ = 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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/**
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* @inheritDoc
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*/
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ol.interaction.DragRotate.prototype.shouldStopEvent = ol.functions.FALSE;
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