uniapp 整合 OpenLayer3 - 加载百度地图
代码如下：
<template><!-- 监听变量 operation 的变化，operation 发生改变时，调用 openlayers 模块的 loadOperation 方法 --><view :operation="valueChangeSign" :change:operation="ol.valueChange" type="default"></view><view class="map" id="map"><view class="bottom-horizontal-button"><button @click="location()" class="btn" type="primary">定位</button></view></view>
</template><script>export default {data() {return {valueChangeSign:{flag:false,latitude:null,//纬度longitude:null//经度},}},onLoad() {},methods: {/*** 点击事件-定位* */location(){// 获取经纬度uni.getLocation({type: 'wgs84 ',success: (res) => {//console.log("res",res)this.valueChangeSign.flag = !this.valueChangeSign.flag;this.valueChangeSign.latitude = res.latitude//接收纬度值this.valueChangeSign.longitude = res.longitude//接收经度值}}); },}}
</script>
<script module="ol" lang="renderjs" type="module">
import Map from 'ol/Map';
import View from 'ol/View';
import TileLayer from 'ol/layer/Tile.js'// OpenLayers的瓦片图层类
import { ScaleLine, defaults as defaultControls, MousePosition } from 'ol/control.js'// OpenLayers的控件类，包括默认的控件集合和特定的全屏、鼠标位置、比例尺控件
import {addCoordinateTransforms, addProjection, Projection, transform} from 'ol/proj.js'
import Feature from 'ol/Feature.js'
import Point from 'ol/geom/Point.js'
import { Vector as VectorLayer } from 'ol/layer.js' // OpenLayers的矢量图层类，用于显示矢量数据
import { Vector as VectorSource } from 'ol/source.js'
import { Circle as CircleStyle, Style, Stroke, Fill, Icon } from "ol/style.js"
import TileGrid from 'ol/tilegrid/TileGrid.js';
import TileImage from 'ol/source/TileImage.js';
import { lngLatToMercator, mercatorToLngLat } from "../../utils/bd09.js"
// 坐标系转换
import { wgs84_to_bd09 } from "../../utils/bd_coordinate_transformation.js"export default {data(){return {map:null,view:null,locationLayer:null,// 定位点图层}},mounted(){this.initMap();},methods:{/*** @param {*} newValue 新的值或状态* @param {*} oldValue 旧的值或状态* @param {*} ownerInstance 拥有该数据或组件的实例* @param {*} instance 当前操作的具体实例*/valueChange(newValue, oldValue, ownerInstance, instance){console.log(newValue, oldValue, ownerInstance, instance);const olLongitude = newValue.longitude;//当前位置的经度const olLatitude = newValue.latitude;//当前位置的纬度
// // 调用定位按钮this.bdLocation(olLongitude,olLatitude);},initMap(){/*定义百度投影，这是实现无偏移加载百度地图离线瓦片核心所在。网上很多相关资料在用OpenLayers加载百度地图离线瓦片时都认为投影就是EPSG:3857(也就是Web墨卡托投影)。事实上这是错误的，因此无法做到无偏移加载。百度地图有自己独特的投影体系，必须在OpenLayers中自定义百度投影，才能实现无偏移加载。百度投影实现的核心文件为bd09.js，在迈高图官网可以找到查看这个文件。*/let projBD09 = new Projection({code: 'BD:09',extent: [-20037726.37, -11708041.66, 20037726.37, 12474104.17],units: 'm',axisOrientation: 'neu',global: false});addProjection(projBD09);addCoordinateTransforms("EPSG:4326", "BD:09",function (coordinate) {// eslint-disable-next-line no-undefreturn lngLatToMercator(coordinate);},function (coordinate) {// eslint-disable-next-line no-undefreturn mercatorToLngLat(coordinate);});/********************/// 自定义分辨率和瓦片坐标系const resolutions = [];const maxZoom = 18;// 计算百度使用的分辨率for(var i=0; i<=maxZoom; i++){resolutions[i] = Math.pow(2, maxZoom-i);}const tilegrid = new TileGrid({origin: [0,0], // 设置原点坐标resolutions: resolutions // 设置分辨率});// 百度地图数据源const baiduSource = new TileImage({projection: 'BD:09', tileGrid: tilegrid,//wrapX: true,//允许左右无限移动tileUrlFunction: function(tileCoord, pixelRatio, proj){if(!tileCoord){return "";}var z = tileCoord[0];var x = tileCoord[1];// 注意，在openlayer3中由于载地图的方式是右上递增// let y: number | string = tileCoord[2];// 而openlayer6中是右下递增，所以y的值需要注意// 6版本需要取负值,同时注意要减一，否则缩放有问题// let y: number | string = -tileCoord[2] - 1;var y = -tileCoord[2]-1;// ol6需要此处减1，否则缩放又偏移// 百度瓦片服务url将负数使用M前缀来标识if(x<0){x = 'M' + (-x);}if(y<0){y = 'M' + (-y);}// online3的3是用来分流的，还可以是其他路径// udt应该表示的是地图发布日期。p表示地图上的信息，scaler表示缩放// 0表示不显示地名等标注信息，只单纯的地图地图，1表示显示地名信息// return `http://online3.map.bdimg.com/onlinelabel/?qt=tile&x=${x}&y=${y}&z=${z}&styles=pl&udt=20220426&scaler=2&p=1`;//20190426return "https://maponline3.bdimg.com/tile/?qt=vtile&x=" + x + "&y=" + y + "&z=" + z + "&styles=pl&udt=20151021&scaler=1&p=1";}});const baiduLayer = new TileLayer({source:baiduSource})this.map = new Map({target: 'map',layers: [baiduLayer],view: new View({projection:'BD:09',center: transform([125.33,43.90], 'EPSG:4326', 'BD:09'),zoom: 10,minZoom: 0,// 最小缩放级别maxZoom: 18, //最大缩放级别constrainResolution: true,// 因为存在非整数的缩放级别，所以设置该参数为true来让每次缩放结束后自动缩放到距离最近的一个整数级别，这个必须要设置，当缩放在非整数级别时地图会糊enableRotation: false,// 禁止地图旋转}),controls:defaultControls({zoom:false,//不显示放大放小按钮rotate:false,// 不显示指北针控件attribution:false//不显示右下角的地图信息控件}).extend([// 比例尺new ScaleLine({//设置比例尺单位，degrees、imperial、us、nautical、metric（度量单位）units: "metric"})])})},bdLocation(longitude,latitude){// 百度地图定位//转成百度坐标系const logLatPoint = wgs84_to_bd09(longitude,latitude);const geom = transform([logLatPoint[0],logLatPoint[1]], 'EPSG:4326', 'BD:09');// 设置中心点定位-直接定位//this.map.getView().setCenter(geom);// 设置层级//this.map.getView().setZoom(18);// 设置中心点-过渡动画this.map.getView().animate({center:geom,// 中心点zoom:18,// 层级duration:1000// 持续时间});// 绘制点const locationPoint = new Point(geom);// 清除绘制点图层this.map.removeLayer(this.locationLayer); // 绘制定位点// 设置点特征（Feature）const pointFeature = new Feature({title:"point",geometry:locationPoint});// 设置特征样式(style)pointFeature.setStyle(new Style({// 使用 CircleStyle 创建一个圆形的点image:new CircleStyle({// 点样式fill:new Fill({//color:"red",// 颜色color: 'rgba(255,0,0,0.4)',}),// 点周边样式stroke:new Stroke({color: '#3399CC',width: 1.25, }),radius:7,// 半径}),}));// 创建和添加特征到源（Source）// VectorSource表示一个矢量要素源，它用于存储和显示地理数据。const source = new VectorSource();source.addFeature(pointFeature);// 创建图层并设置源（Layer）// VectorLayer表示一个矢量图层，它由一系列矢量要素（Feature）组成，用于在地图上显示地理数据。this.locationLayer = new VectorLayer();this.locationLayer.setSource(source);this.map.addLayer(this.locationLayer);},}}</script><style scoped lang="scss">/*去除顶部导航栏*/*{margin:0;padding:0}.map{width:100vw;height: 100vh;position: relative;z-index: 1;}.bottom-horizontal-button{position: absolute;bottom: 0;right: 0;margin-bottom: 30rpx;width: 80rpx;z-index: 10;.btn {width: auto;height: auto;margin: 5px; /* 按钮间距 */padding: 10px; /* 按钮内部填充 */width: 80%; /* 按钮宽度 */text-align: center; /* 按钮文字居中 */}}
</style>
bd09.js:
var MCBAND = [12890594.86, 8362377.87, 5591021, 3481989.83,1678043.12, 0
];
var LLBAND = [75, 60, 45, 30, 15, 0];
var MC2LL = [[1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2],[-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877,47.40033549296737, -16.50741931063887,2.28786674699375, 10260144.86],[-3.030883460898826e-8, 0.00000898305509983578,0.30071316287616, 59.74293618442277,7.357984074871, -25.38371002664745,13.45380521110908, -3.29883767235584,0.32710905363475, 6856817.37],[-1.981981304930552e-8, 0.000008983055099779535,0.03278182852591, 40.31678527705744,0.65659298677277, -4.44255534477492,0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06],[3.09191371068437e-9, 0.000008983055096812155,0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4],[2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5]
];var LL2MC = [[-0.0015702102444, 111320.7020616939,1704480524535203, -10338987376042340,26112667856603880, -35149669176653700,26595700718403920, -10725012454188240,1800819912950474, 82.5],[0.0008277824516172526, 111320.7020463578,647795574.6671607, -4082003173.641316,10774905663.51142, -15171875531.51559,12053065338.62167, -5124939663.577472,913311935.9512032, 67.5],[0.00337398766765, 111320.7020202162,4481351.045890365, -23393751.19931662,79682215.47186455, -115964993.2797253,97236711.15602145, -43661946.33752821,8477230.501135234, 52.5],[0.00220636496208, 111320.7020209128,51751.86112841131, 3796837.749470245,992013.7397791013, -1221952.21711287,1340652.697009075, -620943.6990984312,144416.9293806241, 37.5],[-0.0003441963504368392, 111320.7020576856,278.2353980772752, 2485758.690035394,6070.750963243378, 54821.18345352118,9540.606633304236, -2710.55326746645,1405.483844121726, 22.5],[-0.0003218135878613132, 111320.7020701615,0.00369383431289, 823725.6402795718,0.46104986909093, 2351.343141331292,1.58060784298199, 8.77738589078284,0.37238884252424, 7.45]
];// eslint-disable-next-line no-unused-vars
export function lngLatToMercator(T) {var c = new cd(T[0], T[1]);var r = convertLL2MC(c);return [r.lng, r.lat];
}// eslint-disable-next-line no-unused-vars
export function mercatorToLngLat(T) {var c = new cd(T[0], T[1]);var r = convertMC2LL(c);return [r.lng, r.lat];
}function convertLL2MC(T) {var cL, cN;T.lng = getLoop(T.lng, -180, 180);T.lat = getRange(T.lat, -74, 74);cL = new cd(T.lng, T.lat);for(var cM = 0; cM < LLBAND.length; cM++) {if(cL.lat >= LLBAND[cM]) {cN = LL2MC[cM];break}}if(!cN) {for(var cM = LLBAND.length - 1; cM >= 0; cM--) {if(cL.lat <= -LLBAND[cM]) {cN = LL2MC[cM];break}}}var cO = convertor(T, cN);var T = new cd(cO.lng.toFixed(2), cO.lat.toFixed(2));return T
}function convertMC2LL(cL) {var cM, cO;cM = new cd(Math.abs(cL.lng), Math.abs(cL.lat));for(var cN = 0; cN < MCBAND.length; cN++) {if(cM.lat >= MCBAND[cN]) {cO = MC2LL[cN];break}}var T = convertor(cL, cO);var cL = new cd(T.lng.toFixed(6), T.lat.toFixed(6));return cL
}function getRange(cM, cL, T) {if(cL != null) {cM = Math.max(cM, cL)}if(T != null) {cM = Math.min(cM, T)}return cM
}function getLoop(cM, cL, T) {while(cM > T) {cM -= T - cL}while(cM < cL) {cM += T - cL}return cM
}function convertor(cM, cN) {if(!cM || !cN) {return}var T = cN[0] + cN[1] * Math.abs(cM.lng);var cL = Math.abs(cM.lat) / cN[9];var cO = cN[2] + cN[3] * cL + cN[4] * cL * cL + cN[5] * cL *cL * cL + cN[6] * cL * cL * cL * cL + cN[7] * cL *cL * cL * cL * cL + cN[8] * cL * cL * cL * cL *cL * cL;T *= (cM.lng < 0 ? -1 : 1);cO *= (cM.lat < 0 ? -1 : 1);return new cd(T, cO)
}function cd(T, cL) {if(isNaN(T)) {T = bV(T);T = isNaN(T) ? 0 : T}if(b3(T)) {T = parseFloat(T)}if(isNaN(cL)) {cL = bV(cL);cL = isNaN(cL) ? 0 : cL}if(b3(cL)) {cL = parseFloat(cL)}this.lng = T;this.lat = cL
}
cd.isInRange = function(T) {return T && T.lng <= 180 && T.lng >= -180 && T.lat <= 74 &&T.lat >= -74
};
cd.prototype.equals = function(T) {return T && lat == T.lat && lng == T.lng
};function bV(cN) {var cL = "";var cU, cS, cQ = "";var cT, cR, cP, cO = "";var cM = 0;var T = /[^A-Za-z0-9\+\/\=]/g;if(!cN || T.exec(cN)) {return cN}cN = cN.replace(/[^A-Za-z0-9\+\/\=]/g, "");do {cT = cf.indexOf(cN.charAt(cM++));cR = cf.indexOf(cN.charAt(cM++));cP = cf.indexOf(cN.charAt(cM++));cO = cf.indexOf(cN.charAt(cM++));cU = (cT << 2) | (cR >> 4);cS = ((cR & 15) << 4) | (cP >> 2);cQ = ((cP & 3) << 6) | cO;cL = cL + String.fromCharCode(cU);if(cP != 64) {cL = cL + String.fromCharCode(cS)}if(cO != 64) {cL = cL + String.fromCharCode(cQ)}cU = cS = cQ = "";cT = cR = cP = cO = ""} while (cM < cN.length);return cL
}function b3(T) {return typeof T == "string"
}参考：openlayers6 解决调用百度地图之瓦片偏移、坐标偏移、无限拖动裂缝偏移问题_openlayers百度地图偏移-CSDN博客
coordinate_transformation.js:
//wgs84_to_gcj02.js文件//地标 转 国测 常量
var x_PI = (3.14159265358979324 * 3000.0) / 180.0;
var PI = 3.1415926535897932384626;
var a = 6378245.0; //卫星椭球坐标投影到平面地图坐标系的投影因子。
var ee = 0.00669342162296594323; //椭球的偏心率。
var EARTHRADIUS = 6370996.81;
var MCBAND = [12890594.86, 8362377.87, 5591021, 3481989.83, 1678043.12, 0];
var LLBAND = [75, 60, 45, 30, 15, 0];
var MC2LL = [[1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2], [-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86], [-3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37], [-1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06], [3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4], [2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5]];
var LL2MC = [[-0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340, 26112667856603880, -35149669176653700, 26595700718403920, -10725012454188240, 1800819912950474, 82.5], [0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5], [0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5], [0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5], [-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5], [-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45]];//判断是否在国内，在中国国内的经纬度才需要做偏移
function out_of_china(lng, lat) {return (lng < 72.004 ||lng > 137.8347 ||(lat < 0.8293 || lat > 55.8271 || false));
}//转化经度
function transformlng(lng, lat) {var ret =300.0 +lng +2.0 * lat +0.1 * lng * lng +0.1 * lng * lat +0.1 * Math.sqrt(Math.abs(lng));ret +=((20.0 * Math.sin(6.0 * lng * PI) +20.0 * Math.sin(2.0 * lng * PI)) *2.0) /3.0;ret +=((20.0 * Math.sin(lng * PI) +40.0 * Math.sin((lng / 3.0) * PI)) *2.0) /3.0;ret +=((150.0 * Math.sin((lng / 12.0) * PI) +300.0 * Math.sin((lng / 30.0) * PI)) *2.0) /3.0;return ret;
}//转化纬度
function transformlat(lng, lat) {var ret = -100.0 +2.0 * lng +3.0 * lat +0.2 * lat * lat +0.1 * lng * lat +0.2 * Math.sqrt(Math.abs(lng));ret +=((20.0 * Math.sin(6.0 * lng * PI) +20.0 * Math.sin(2.0 * lng * PI)) *2.0) /3.0;ret +=((20.0 * Math.sin(lat * PI) +40.0 * Math.sin((lat / 3.0) * PI)) *2.0) /3.0;ret +=((160.0 * Math.sin((lat / 12.0) * PI) +320 * Math.sin((lat * PI) / 30.0)) *2.0) /3.0;return ret;
}function getLoop(lng, min, max){while (lng > max) {lng -= max - min;}while (lng < min) {lng += max - min;}return lng;
}function getRange(lat, min, max) {if (min != null) {lat = Math.max(lat, min);}if (max != null) {lat = Math.min(lat, max);}return lat;
}//wgs84 to gcj02 地球坐标系 转 火星坐标系
export function wgs84_to_gcj02(lng, lat) {if (out_of_china(lng, lat)) {return [lng, lat];} else {var dlat = transformlat(lng - 105.0, lat - 35.0);var dlng = transformlng(lng - 105.0, lat - 35.0);var radlat = (lat / 180.0) * PI;var magic = Math.sin(radlat);magic = 1 - ee * magic * magic;var sqrtmagic = Math.sqrt(magic);dlat =(dlat * 180.0) /(((a * (1 - ee)) / (magic * sqrtmagic)) * PI);dlng =(dlng * 180.0) / ((a / sqrtmagic) * Math.cos(radlat) * PI);var mglat = lat + dlat;var mglng = lng + dlng;return [mglng, mglat];}
}//gcj02 to wgs84 火星坐标系 转 地球坐标系
export function gcj02_to_wgs84(lng, lat) {if (out_of_china(lng, lat)) {return [lng, lat]} else {var dlat = transformlat(lng - 105.0, lat - 35.0);var dlng = transformlng(lng - 105.0, lat - 35.0);var radlat = lat / 180.0 * PI;var magic = Math.sin(radlat);magic = 1 - ee * magic * magic;var sqrtmagic = Math.sqrt(magic);dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);mglat = lat + dlat;mglng = lng + dlng;return [lng * 2 - mglng, lat * 2 - mglat]}
}// wgs84 to bd09 地球坐标系转百度09坐标系
export function wgs84_to_bd09(lng, lat){//先由经纬转火星var arr = wgs84_to_gcj02(lng,lat);//再将火星转百度arr = gcj02_to_bd09(arr[0], arr[1]);return arr;
}// 火星坐标系gcj02 to 百度坐标系bd09
// 例如 - 谷歌、高德 转 百度export function gcj02_to_bd09(lng, lat){var z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);var theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);var bd_lng = z * Math.cos(theta) + 0.0065;var bd_lat = z * Math.sin(theta) + 0.006;return [bd_lng, bd_lat];}//百度经纬度转百度墨卡托
export function bd_to_bdmkt(lng, lat){var cF = null;lng = getLoop(lng, -180, 180);lat = getRange(lat, -74, 74);for (var i = 0; i < LLBAND.length; i++) {if (lat >= LLBAND[i]) {cF = LL2MC[i];break;}}if (cF != null) {for (var i = LLBAND.length - 1; i >= 0; i--) {if (lat <= -LLBAND[i]) {cF = LL2MC[i];break;}}} lng = cF[0] + cF[1] * Math.abs(lng);var cC = Math.abs(lat) / cF[9];lat = cF[2] + cF[3] * cC + cF[4] * cC * cC + cF[5] * cC * cC * cC + cF[6] * cC * cC * cC * cC + cF[7] * cC * cC * cC * cC * cC + cF[8] * cC * cC * cC * cC * cC * cC;lng *= (lng < 0 ? -1 : 1);lat *= (lat < 0 ? -1 : 1);return [lng, lat];
}