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openlayers

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Build tools and sources for developing OpenLayers based mapping applications

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goog.provide('ol.control.Rotate'); goog.require('ol.events'); goog.require('ol.events.EventType'); goog.require('ol'); goog.require('ol.control.Control'); goog.require('ol.css'); goog.require('ol.easing'); /** * @classdesc * A button control to reset rotation to 0. * To style this control use css selector `.ol-rotate`. A `.ol-hidden` css * selector is added to the button when the rotation is 0. * * @constructor * @extends {ol.control.Control} * @param {olx.control.RotateOptions=} opt_options Rotate options. * @api stable */ ol.control.Rotate = function(opt_options) { var options = opt_options ? opt_options : {}; var className = options.className !== undefined ? options.className : 'ol-rotate'; var label = options.label !== undefined ? options.label : '\u21E7'; /** * @type {Element} * @private */ this.label_ = null; if (typeof label === 'string') { this.label_ = document.createElement('span'); this.label_.className = 'ol-compass'; this.label_.textContent = label; } else { this.label_ = label; this.label_.classList.add('ol-compass'); } var tipLabel = options.tipLabel ? options.tipLabel : 'Reset rotation'; var button = document.createElement('button'); button.className = className + '-reset'; button.setAttribute('type', 'button'); button.title = tipLabel; button.appendChild(this.label_); ol.events.listen(button, ol.events.EventType.CLICK, ol.control.Rotate.prototype.handleClick_, this); var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' + ol.css.CLASS_CONTROL; var element = document.createElement('div'); element.className = cssClasses; element.appendChild(button); var render = options.render ? options.render : ol.control.Rotate.render; this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined; ol.control.Control.call(this, { element: element, render: render, target: options.target }); /** * @type {number} * @private */ this.duration_ = options.duration !== undefined ? options.duration : 250; /** * @type {boolean} * @private */ this.autoHide_ = options.autoHide !== undefined ? options.autoHide : true; /** * @private * @type {number|undefined} */ this.rotation_ = undefined; if (this.autoHide_) { this.element.classList.add(ol.css.CLASS_HIDDEN); } }; ol.inherits(ol.control.Rotate, ol.control.Control); /** * @param {Event} event The event to handle * @private */ ol.control.Rotate.prototype.handleClick_ = function(event) { event.preventDefault(); if (this.callResetNorth_ !== undefined) { this.callResetNorth_(); } else { this.resetNorth_(); } }; /** * @private */ ol.control.Rotate.prototype.resetNorth_ = function() { var map = this.getMap(); var view = map.getView(); if (!view) { // the map does not have a view, so we can't act // upon it return; } var currentRotation = view.getRotation(); if (currentRotation !== undefined) { if (this.duration_ > 0) { currentRotation = currentRotation % (2 * Math.PI); if (currentRotation < -Math.PI) { currentRotation += 2 * Math.PI; } if (currentRotation > Math.PI) { currentRotation -= 2 * Math.PI; } view.animate({ rotation: 0, duration: this.duration_, easing: ol.easing.easeOut }); } else { view.setRotation(0); } } }; /** * Update the rotate control element. * @param {ol.MapEvent} mapEvent Map event. * @this {ol.control.Rotate} * @api */ ol.control.Rotate.render = function(mapEvent) { var frameState = mapEvent.frameState; if (!frameState) { return; } var rotation = frameState.viewState.rotation; if (rotation != this.rotation_) { var transform = 'rotate(' + rotation + 'rad)'; if (this.autoHide_) { var contains = this.element.classList.contains(ol.css.CLASS_HIDDEN); if (!contains && rotation === 0) { this.element.classList.add(ol.css.CLASS_HIDDEN); } else if (contains && rotation !== 0) { this.element.classList.remove(ol.css.CLASS_HIDDEN); } } this.label_.style.msTransform = transform; this.label_.style.webkitTransform = transform; this.label_.style.transform = transform; } this.rotation_ = rotation; };