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278 lines
6.8 KiB
278 lines
6.8 KiB
import VectorLayer from "ol/layer/Vector";
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import VectorSource from "ol/source/Vector";
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import Draw from 'ol/interaction/Draw';
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import {
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Fill,
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Stroke,
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Style,
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Text as TextStyle
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} from "ol/style";
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import CircleStyle from "ol/style/Circle";
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import {
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getArea,
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getLength
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} from 'ol/sphere.js';
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import {
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LineString,
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Point
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} from "ol/geom";
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const serverUrl = 'https://app.hycdyzt.com';
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const geoserverUrl = 'http://47.109.60.82:8080';
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const mgServerUrl = 'http://47.109.60.82:9989/openApi'
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const globalMap = {
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map: null
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}
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const formatArea = function(polygon) {
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let area = getArea(polygon, {
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projection: 'EPSG:4326'
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});
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area = area * 0.0015
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let output;
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if (area > 10000) {
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output = Math.round((area / 10000) * 100) / 100 + ' ' + '万亩';
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} else {
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output = Math.round(area * 100) / 100 + ' ' + '亩';
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}
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return output;
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};
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const formatLength = function(line) {
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const length = getLength(line, {
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projection: 'EPSG:4326'
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});
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let output;
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if (length > 100) {
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output = Math.round((length / 1000) * 100) / 100 + ' ' + 'km';
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} else {
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output = Math.round(length * 100) / 100 + ' ' + 'm';
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}
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return output;
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};
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const generateStyle = (feature, {
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fillOpt,
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strokeOpt,
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withNode
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}) => {
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let area = 0;
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const geom = feature.getGeometry();
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let lineStyle;
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if (geom.getType() === 'Polygon') {
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area = formatArea(geom);
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const lineString = new LineString(geom.getCoordinates()[0]);
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const length = formatLength(lineString);
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lineStyle = [new Style({
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geometry: lineString,
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text: new TextStyle({
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text: length,
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"textBaseline": "middle",
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"font": "bold 10px/1 Verdana",
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"offsetX": 0,
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"offsetY": 0,
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fill: new Fill({
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color: 'rgba(255, 255, 255, 1)',
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}),
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stroke: new Stroke({
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width: 2,
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color: 'rgba(0, 0, 0, 1)',
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}),
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"placement": "line",
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"maxAngle": 0.7853981633974483,
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"overflow": true,
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"rotation": 0
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})
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}), ...(withNode ? geom.getCoordinates()[0]?.map(coordinates => {
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return new Style({
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geometry: new Point(coordinates),
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image: new CircleStyle({
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fill: new Fill({
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color: '#0ff'
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}),
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radius: 2
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})
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})
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}) : [])]
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}
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return [new Style({
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fill: new Fill({
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...fillOpt
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}),
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stroke: new Stroke({
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width: 2,
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...strokeOpt
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}),
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text: geom.getType() !== 'Polygon' ? undefined : new TextStyle({
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text: area,
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"textBaseline": "middle",
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"font": "bold 10px/1 Verdana",
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"offsetX": 0,
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"offsetY": 0,
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fill: new Fill({
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color: 'rgba(0, 0, 0, 0.9)',
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}),
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"placement": "point",
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"maxAngle": 0.7853981633974483,
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"overflow": true,
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"rotation": 0
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})
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}), ...(lineStyle || [])].filter(item => item);
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}
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const startMeasure = (map, callback) => {
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map.removeLayer(map.getAllLayers().find(l => l.get('id') === 'draw-layer'));
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const source = new VectorSource();
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const vector = new VectorLayer({
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id: 'draw-layer',
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source: source,
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zIndex: 9999,
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style: feature => {
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return generateStyle(feature, {
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fillOpt: {
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color: 'rgba(255, 255, 255, 0.4)',
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},
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strokeOpt: {
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color: '#ffcc33',
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width: 2,
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}
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})
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}
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});
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const draw = new Draw({
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source: source,
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type: 'Polygon',
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stopClick: true,
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freehand: true,
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style: function(feature) {
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return generateStyle(feature, {
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fillOpt: {
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color: 'rgba(255, 255, 255, 0.2)',
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},
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strokeOpt: {
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color: 'rgba(0, 0, 0, 0.5)',
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lineDash: [10, 10],
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width: 2,
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}
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})
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},
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});
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map.addInteraction(draw);
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draw.on('drawend', function() {
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map.addLayer(vector)
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map.removeInteraction(draw);
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callback();
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});
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}
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//定义一些常量
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var x_PI = 3.14159265358979324 * 3000.0 / 180.0;
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var PI = 3.1415926535897932384626;
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var a = 6378245.0;
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var ee = 0.00669342162296594323;
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/**
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* 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
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* 即 百度 转 谷歌、高德
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*/
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function bd09togcj02(bd_lon, bd_lat) {
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var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
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var x = bd_lon - 0.0065;
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var y = bd_lat - 0.006;
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var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
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var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
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var gg_lng = z * Math.cos(theta);
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var gg_lat = z * Math.sin(theta);
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return [gg_lng, gg_lat]
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}
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/**
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* 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
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* 即谷歌、高德 转 百度
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*/
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function gcj02tobd09(lng, lat) {
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var z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);
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var theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);
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var bd_lng = z * Math.cos(theta) + 0.0065;
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var bd_lat = z * Math.sin(theta) + 0.006;
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return [bd_lng, bd_lat]
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}
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/**
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* WGS84转GCj02
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*/
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function wgs84togcj02(lng, lat) {
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if (out_of_china(lng, lat)) {
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return [lng, lat]
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} else {
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var dlat = transformlat(lng - 105.0, lat - 35.0);
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var dlng = transformlng(lng - 105.0, lat - 35.0);
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var radlat = lat / 180.0 * PI;
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var magic = Math.sin(radlat);
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magic = 1 - ee * magic * magic;
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var sqrtmagic = Math.sqrt(magic);
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dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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var mglat = lat + dlat;
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var mglng = lng + dlng;
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return [mglng, mglat]
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}
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}
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/**
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* GCJ02 转换为 WGS84
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*/
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function gcj02towgs84(lng, lat) {
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if (out_of_china(lng, lat)) {
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return [lng, lat]
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} else {
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var dlat = transformlat(lng - 105.0, lat - 35.0);
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var dlng = transformlng(lng - 105.0, lat - 35.0);
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var radlat = lat / 180.0 * PI;
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var magic = Math.sin(radlat);
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magic = 1 - ee * magic * magic;
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var sqrtmagic = Math.sqrt(magic);
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dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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var mglat = lat + dlat;
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var mglng = lng + dlng;
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return [lng * 2 - mglng, lat * 2 - mglat]
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}
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}
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function transformlat(lng, lat) {
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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));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
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return ret
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}
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function transformlng(lng, lat) {
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var ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;
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return ret
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}
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/**
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* 判断是否在国内，不在国内则不做偏移
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*/
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function out_of_china(lng, lat) {
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return (lng < 72.004 || lng > 137.8347) || ((lat < 0.8293 || lat > 55.8271) || false);
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}
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export default {
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serverUrl,
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geoserverUrl,
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globalMap,
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mgServerUrl,
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startMeasure,
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tempToken: '',
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formatArea,
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formatLength,
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generateStyle,
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tempUserInfo: '',
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gcj02towgs84
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} |