143 lines
3.1 KiB
JavaScript
143 lines
3.1 KiB
JavaScript
// FIXME works for View2D only
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goog.provide('ol.interaction.TouchRotate');
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goog.require('goog.asserts');
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goog.require('ol.View');
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goog.require('ol.ViewHint');
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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.TOUCHROTATE_ANIMATION_DURATION = 250;
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/**
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/**
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* @constructor
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* @extends {ol.interaction.Touch}
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* @param {number=} opt_threshold Minimal angle to start a rotation.
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* Default to 0.3 (radian).
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*/
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ol.interaction.TouchRotate = function(opt_threshold) {
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goog.base(this);
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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_;
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/**
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* @private
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* @type {boolean}
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*/
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this.rotating_ = false;
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/**
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* @private
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* @type {number}
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*/
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this.rotationDelta_ = 0.0;
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/**
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* @private
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* @type {number}
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*/
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this.threshold_ = goog.isDef(opt_threshold) ? opt_threshold : 0.3;
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};
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goog.inherits(ol.interaction.TouchRotate, ol.interaction.Touch);
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/**
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* @inheritDoc
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*/
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ol.interaction.TouchRotate.prototype.handleTouchMove =
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function(mapBrowserEvent) {
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goog.asserts.assert(this.targetTouches.length >= 2);
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var rotationDelta = 0.0;
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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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// angle between touches
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var angle = Math.atan2(
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touch1.clientY - touch0.clientY,
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touch1.clientX - touch0.clientX);
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if (goog.isDef(this.lastAngle_)) {
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var delta = angle - this.lastAngle_;
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this.rotationDelta_ += delta;
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if (!this.rotating_ &&
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Math.abs(this.rotationDelta_) > this.threshold_) {
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this.rotating_ = true;
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}
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rotationDelta = delta;
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}
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this.lastAngle_ = angle;
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var map = mapBrowserEvent.map;
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var view = map.getView();
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// rotate anchor point.
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// FIXME: should be the intersection point between the lines:
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// touch0,touch1 and previousTouch0,previousTouch1
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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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var anchor = map.getCoordinateFromPixel(centroid);
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// rotate
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if (this.rotating_) {
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view.rotateWithoutConstraints(map, view.getRotation() + rotationDelta,
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anchor);
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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.TouchRotate.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();
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if (this.rotating_) {
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view.rotate(map, view.getRotation(), undefined,
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ol.interaction.TOUCHROTATE_ANIMATION_DURATION);
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}
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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.TouchRotate.prototype.handleTouchStart =
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function(mapBrowserEvent) {
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if (this.targetTouches.length >= 2) {
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var view = mapBrowserEvent.map.getView();
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this.lastAngle_ = undefined;
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this.rotating_ = false;
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this.rotationDelta_ = 0.0;
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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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