本文实例为大家分享了openlayers实现图标拖动获取坐标的具体代码，供大家参考，具体内容如下
本文所涉及的技术如下：
openlayers加载国家天地图和浙江天地图，图标拖动获取位置，openlayers动画。
效果如下：
代码如下：
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var map; var dataResult;var app = {}; /** * @constructor * @extends {ol.interaction.Pointer} */ app.Drag = function() { ol.interaction.Pointer.call(this, { handleDownEvent: app.Drag.prototype.handleDownEvent, handleDragEvent: app.Drag.prototype.handleDragEvent, handleMoveEvent: app.Drag.prototype.handleMoveEvent, handleUpEvent: app.Drag.prototype.handleUpEvent }); /** * @type {ol.Pixel} * @private */ this.coordinate_ = null; /** * @type {string|undefined} * @private */ this.cursor_ = 'pointer'; /** * @type {ol.Feature} * @private */ this.feature_ = null; /** * @type {string|undefined} * @private */ this.previousCursor_ = undefined; }; ol.inherits(app.Drag, ol.interaction.Pointer); /** * @param {ol.MapBrowserEvent} evt Map browser event. * @return {boolean} `true` to start the drag sequence. */ app.Drag.prototype.handleDownEvent = function(evt) { var map = evt.map; var feature = map.forEachFeatureAtPixel(evt.pixel, function(feature) { return feature; }); if (feature) { this.coordinate_ = evt.coordinate; this.feature_ = feature; } return !!feature; }; /** * @param {ol.MapBrowserEvent} evt Map browser event. */ app.Drag.prototype.handleDragEvent = function(evt) { var deltaX = evt.coordinate[0] - this.coordinate_[0]; var deltaY = evt.coordinate[1] - this.coordinate_[1]; var geometry = this.feature_.getGeometry(); geometry.translate(deltaX, deltaY); this.coordinate_[0] = evt.coordinate[0]; this.coordinate_[1] = evt.coordinate[1]; //console.log(this); }; /** * @param {ol.MapBrowserEvent} evt Event. */ app.Drag.prototype.handleMoveEvent = function(evt) { if (this.cursor_) { var map = evt.map; var feature = map.forEachFeatureAtPixel(evt.pixel, function(feature) { return feature; }); var element = evt.map.getTargetElement(); if (feature) { if (element.style.cursor != this.cursor_) { this.previousCursor_ = element.style.cursor; element.style.cursor = this.cursor_; } } else if (this.previousCursor_ !== undefined) { element.style.cursor = this.previousCursor_; this.previousCursor_ = undefined; } } }; /** * @return {boolean} `false` to stop the drag sequence. */ app.Drag.prototype.handleUpEvent = function() { dataResult={"coordinatex":this.coordinate_[0],"coordinatey":this.coordinate_[1]}; this.coordinate_ = null; this.feature_ = null; return false; }; /** * @desc 定义坐标系统与范围 */var worldExtent = [-180,-90,180,90 ];// 世界范围var projection = ol.proj.get("EPSG:4326"); //4326坐标var projectionExtent = projection.getExtent();/** * @desc 去掉第0层的天地图分辨率信息，不会出现缩放到最后是空白的现象 */var tdtResolutions = [ 0.02197265625, 0.010986328125, 0.0054931640625, 0.00274658203125, 0.001373291015625, 0.0006866455078125, 0.00034332275390625, 0.000171661376953125, 0.0000858306884765625, 0.00004291534423828125, 0.000021457672119140625, 0.0000107288360595703125,0.00000536441802978515625,0.000002682209014892578125,0.0000013411045074462890625 ]; /** *@desc 与分辨率信息需要每层严格对应起来 */var matrixIds = [6, 7, 8, 9, 10, 11, 12, 13, 14];var matrixIdszj=[15, 16, 17,18,19,20] /** * @desc 天地图格网信息 */var tdtGrid = new ol.tilegrid.WMTS( { origin : ol.extent.getTopLeft(projectionExtent), resolutions : tdtResolutions.slice(0, 9), matrixIds : matrixIds});var tdtGridzj = new ol.tilegrid.WMTS( { origin : ol.extent.getTopLeft(projectionExtent), resolutions : tdtResolutions.slice(9, 15), matrixIds : matrixIdszj}); /** * @desc 国家天地图图层 */var wmtsVecLayer = new ol.layer.Tile( { source : new ol.source.WMTS( { layer : 'vec', style : 'default', version : '1.0.0', matrixSet : 'c', format : 'tiles', url : 'http://t{0-6}.tianditu.com/vec_c/wmts?tk=key', tileGrid : tdtGrid, wrapX : true }), minResolution: 0.0000858306884765625, maxResolution: 0.02197265625}); var wmtsAnnoLayer = new ol.layer.Tile( { source : new ol.source.WMTS( { layer : 'cva', style : 'default', version : '1.0.0', matrixSet : 'c', format : 'tiles', url : 'http://t{0-6}.tianditu.com/cva_c/wmts?tk=key', tileGrid : tdtGrid, wrapX : true }), minResolution: 0.0000858306884765625, maxResolution: 0.02197265625}); /** * @desc 浙江天地图图层 */var zJVecLayer = new ol.layer.Tile( { source : new ol.source.WMTS( { style : 'default', version : '1.0.0', wrapX : true, layer : 'ZJEMAP', matrixSet:'TileMatrixSet0', format : 'image/png', url : 'http://srv.zjditu.cn/ZJEMAP_2D/wmts', tileGrid : tdtGridzj, wrapX : true }), minResolution: 0.0000013411045074462890625, maxResolution: 0.0000858306884765625,}); var zJAnnoLayer =new ol.layer.Tile( { source : new ol.source.WMTS( { style : 'default', version : '1.0.0', wrapX : true, layer : 'ZJEMAPANNO', matrixSet : 'TileMatrixSet0', format : 'image/png', url : 'http://srv.zjditu.cn/ZJEMAPANNO_2D/wmts', tileGrid : tdtGridzj, wrapX : true }), minResolution: 0.0000013411045074462890625, maxResolution: 0.0000858306884765625,}); var devVectorSource = new ol.source.Vector();var devVectorLayer = new ol.layer.Vector({ source:devVectorSource, style:pointStyleFunction}); //定位点要素var positionFeature = new ol.Feature();positionFeature.setStyle(new ol.style.Style({ image: new ol.style.Circle({ radius: 6, fill: new ol.style.Fill({ color: '#3399CC' }), stroke: new ol.style.Stroke({ color: '#fff', width: 2 }) })})); function flyLocation(center) { var duration = 1000; //持续时间（毫秒） var start = +new Date(); //移动效果 var pan = ol.animation.pan({ duration: duration, //设置持续时间 source: /** @type {ol.Coordinate} */(map.getView().getCenter()), start: start }); //反弹效果 /* var bounce = ol.animation.bounce({ duration: duration, //设置持续时间 resolution: 2 * map.getView().getResolution(), //4倍分辨率 start: start }); */ map.beforeRender(pan); //地图渲染前设置动画效果(pan+bounce) map.getView().setCenter(center); //平移地图 map.getView().setZoom(18); //放大地图}//创建定位点矢量图层（featuresOverlay）var featuresOverlay = new ol.layer.Vector({ source: new ol.source.Vector({ features: [positionFeature] })}); function GetRequest() { var url = decodeURI(location.search); //获取url中"?"符后的字串 var theRequest = new Object(); if (url.indexOf("?") != -1) { var str = url.substr(1); strs = str.split("&"); for(var i = 0; i < strs.length; i ++) { theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]); } } return theRequest; } var type;//初始坐标var data={"coordinatex":(GetRequest().x?GetRequest().x:121.54610300015),"coordinatey":(GetRequest().y?GetRequest().y:29.876429)};/** * @desc 初始化 * @return */$(function(){ //document.getElementById("topBar").style.fontSize=document.getElementById("topBar").width; initMap(); // showJq(); dataResult=data; loadData(data);}); /** * @desc:初始化地图 * @return */function initMap() { map = new ol.Map( { // 设置地图控件，默认的三个控件都不显示 controls: ol.control.defaults({ attribution: false, zoom: false }), view : new ol.View({ // extent:[120.320631,30.311294,120.332057,30.319126],//定义地图容器范围，不是地图的初始化范围 center : [121.54610300015,29.876429], zoom :18, projection : projection, maxZoom: 20, minZoom: 9 }), // logo: false, // 不显示logo // logo: 'logo.png', // 用一个图片 logo.png 作为logo //logo: {src: 'images/logo.png', href: 'http://www.openstreetmap.org/'}, // 点击能跳转到对应页面 layers : [ wmtsVecLayer,wmtsAnnoLayer,zJVecLayer,zJAnnoLayer], target : 'map', interactions: ol.interaction.defaults({ pinchRotate:false }).extend([new app.Drag()]) }); map.addLayer(devVectorLayer); map.addLayer(featuresOverlay); //添加定位点标注（矢量要素图层）}; function loadData(dataJson){ // var dataJson = $.parseJSON(data); //map.getView().fit(initExtent,map.getSize()); devVectorSource.clear(); //isCheck = dataJson.dev.isCheck; var devArr = dataJson; if(dataJson.coordinatex&&dataJson.coordinatey){ var features = new Array(); if(devArr.coordinatex && devArr.coordinatey){ var feature = new ol.Feature(new ol.geom.Point([parseFloat(devArr.coordinatex),parseFloat(devArr.coordinatey)])); feature.setProperties(devArr); features.push(feature); } devVectorSource.addFeatures(features); var num = parseInt(Math.random()*features.length,10); var ft = features[num]; var ptCoord = ft.getGeometry().getCoordinates(); map.getView().setCenter(ptCoord); map.getView().setZoom(18); } } function pointStyleFunction(feature,resolution){ var imgPath = 'images/location.png'; return [new ol.style.Style({ image: new ol.style.Icon({ anchor: [0.5, 1], // opacity: 0.9, src: imgPath }) })]} function defaultPoints(){ loadData(data);}function uploadPoints(){ console.log(dataResult);}function closeWindow(){ if(confirm("确定要退出吗？")){ var browserName=navigator.appName; if (browserName=="Netscape"){ window.opener=null; window.open('', '_self', ''); window.close(); } if (browserName=="Microsoft Internet Explorer") { window.parent.opener = "whocares"; window.parent.close(); } }} |
HTML文件：
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<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>定位</title> <link rel="stylesheet" href="ol.css" > <style type="text/css"> #map{ width:100%; height:100%; position:absolute; margin:0; } body{ margin: 0; padding: 0; } #topBar{ position:absolute; z-index:99; top:5px; height:70px; font-size:200%; background-color:#263344; color:#ffffff; left:10px; right:10px; } #uploadPoints{ float:right; color:#fff; margin-top:14px; margin-right:7px; } #topBar_left{ float:left; color:#fff; margin-top:14px; margin-left:7px; } #menu{ width:100%; height:20px; padding:5px 10px; font-size:14px; font-family:"微软雅黑"; left:10px; } </style></head> <body> <div id="topBar" style="visibility:visible"> <div id="topBar_left"> <a id="close" onclick="closeWindow();" >关闭</a> <a id="default" onclick="defaultPoints();" >| 默认位置</a> </div> <div id="uploadPoints" onclick="uploadPoints();" >使用此位置</div> </div> <div id='map' class="hescgis-map"></div> </div> <script type="text/javascript" src="jquery.js"></script><script type="text/javascript" src="ol.js"></script><script type="text/javascript" src="map.js"></script> </body> </html> |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/chaoyang89111/article/details/91045638
