154 lines
4.0 KiB
JavaScript
154 lines
4.0 KiB
JavaScript
goog.provide('ol.interaction.PinchZoom');
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goog.require('ol');
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goog.require('ol.View');
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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 zoom the map by pinching with two fingers
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* on a touch screen.
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*
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* @constructor
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* @extends {ol.interaction.Pointer}
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* @param {olx.interaction.PinchZoomOptions=} opt_options Options.
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* @api stable
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*/
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ol.interaction.PinchZoom = function(opt_options) {
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ol.interaction.Pointer.call(this, {
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handleDownEvent: ol.interaction.PinchZoom.handleDownEvent_,
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handleDragEvent: ol.interaction.PinchZoom.handleDragEvent_,
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handleUpEvent: ol.interaction.PinchZoom.handleUpEvent_
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});
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var options = opt_options ? opt_options : {};
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/**
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* @private
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* @type {ol.Coordinate}
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*/
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this.anchor_ = null;
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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 : 400;
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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.lastDistance_ = 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_ = 1;
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};
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ol.inherits(ol.interaction.PinchZoom, ol.interaction.Pointer);
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/**
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* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
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* @this {ol.interaction.PinchZoom}
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* @private
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*/
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ol.interaction.PinchZoom.handleDragEvent_ = function(mapBrowserEvent) {
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ol.DEBUG && console.assert(this.targetPointers.length >= 2,
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'length of this.targetPointers should be 2 or more');
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var scaleDelta = 1.0;
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var touch0 = this.targetPointers[0];
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var touch1 = this.targetPointers[1];
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var dx = touch0.clientX - touch1.clientX;
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var dy = touch0.clientY - touch1.clientY;
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// distance between touches
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var distance = Math.sqrt(dx * dx + dy * dy);
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if (this.lastDistance_ !== undefined) {
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scaleDelta = this.lastDistance_ / distance;
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}
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this.lastDistance_ = distance;
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if (scaleDelta != 1.0) {
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this.lastScaleDelta_ = scaleDelta;
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}
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var map = mapBrowserEvent.map;
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var view = map.getView();
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var resolution = view.getResolution();
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// scale anchor point.
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var viewportPosition = map.getViewport().getBoundingClientRect();
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var centroid = ol.interaction.Pointer.centroid(this.targetPointers);
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centroid[0] -= viewportPosition.left;
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centroid[1] -= viewportPosition.top;
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this.anchor_ = map.getCoordinateFromPixel(centroid);
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// scale, bypass the resolution constraint
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map.render();
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ol.interaction.Interaction.zoomWithoutConstraints(
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map, view, resolution * scaleDelta, this.anchor_);
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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.PinchZoom}
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* @private
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*/
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ol.interaction.PinchZoom.handleUpEvent_ = function(mapBrowserEvent) {
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if (this.targetPointers.length < 2) {
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var map = mapBrowserEvent.map;
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var view = map.getView();
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view.setHint(ol.View.Hint.INTERACTING, -1);
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var resolution = view.getResolution();
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// Zoom to final resolution, with an animation, and provide a
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// direction not to zoom out/in if user was pinching in/out.
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// Direction is > 0 if pinching out, and < 0 if pinching in.
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var direction = this.lastScaleDelta_ - 1;
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ol.interaction.Interaction.zoom(map, view, resolution,
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this.anchor_, this.duration_, direction);
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return false;
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} else {
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return true;
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}
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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.PinchZoom}
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* @private
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*/
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ol.interaction.PinchZoom.handleDownEvent_ = function(mapBrowserEvent) {
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if (this.targetPointers.length >= 2) {
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var map = mapBrowserEvent.map;
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this.anchor_ = null;
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this.lastDistance_ = undefined;
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this.lastScaleDelta_ = 1;
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if (!this.handlingDownUpSequence) {
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map.getView().setHint(ol.View.Hint.INTERACTING, 1);
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}
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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.PinchZoom.prototype.shouldStopEvent = ol.functions.FALSE;
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