133 lines
3.1 KiB
JavaScript
133 lines
3.1 KiB
JavaScript
// FIXME works for View2D only
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goog.provide('ol.interaction.TouchZoom');
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goog.require('goog.asserts');
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goog.require('goog.style');
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goog.require('ol.Coordinate');
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goog.require('ol.View');
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goog.require('ol.ViewHint');
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goog.require('ol.interaction.Interaction');
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goog.require('ol.interaction.Touch');
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/**
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* @define {number} Animation duration.
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*/
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ol.interaction.TOUCHZOOM_ANIMATION_DURATION = 400;
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/**
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* @constructor
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* @extends {ol.interaction.Touch}
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*/
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ol.interaction.TouchZoom = function() {
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goog.base(this);
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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|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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goog.inherits(ol.interaction.TouchZoom, ol.interaction.Touch);
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/**
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* @inheritDoc
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*/
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ol.interaction.TouchZoom.prototype.handleTouchMove =
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function(mapBrowserEvent) {
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goog.asserts.assert(this.targetTouches.length >= 2);
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var scaleDelta = 1.0;
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var touch0 = this.targetTouches[0];
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var touch1 = this.targetTouches[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 (goog.isDef(this.lastDistance_)) {
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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().getView2D();
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// scale anchor point.
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var viewportPosition = goog.style.getClientPosition(map.getViewport());
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var centroid = ol.interaction.Touch.centroid(this.targetTouches);
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centroid.x -= viewportPosition.x;
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centroid.y -= viewportPosition.y;
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this.anchor_ = map.getCoordinateFromPixel(centroid);
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// scale, bypass the resolution constraint
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map.requestRenderFrame();
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ol.interaction.Interaction.zoomWithoutConstraints(
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map, view, view.getResolution() * scaleDelta, this.anchor_);
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.TouchZoom.prototype.handleTouchEnd =
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function(mapBrowserEvent) {
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if (this.targetTouches.length < 2) {
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var map = mapBrowserEvent.map;
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var view = map.getView().getView2D();
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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, view.getResolution(),
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this.anchor_, ol.interaction.TOUCHZOOM_ANIMATION_DURATION, direction);
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view.setHint(ol.ViewHint.INTERACTING, -1);
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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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* @inheritDoc
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*/
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ol.interaction.TouchZoom.prototype.handleTouchStart =
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function(mapBrowserEvent) {
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if (this.targetTouches.length >= 2) {
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var map = mapBrowserEvent.map;
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var view = map.getView();
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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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map.requestRenderFrame();
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view.setHint(ol.ViewHint.INTERACTING, 1);
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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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