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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<link rel="stylesheet" href="v6.12.0/css/ol.css" type="text/css" />
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<link rel="stylesheet" href="../../../css/pintuer-min.css" type="text/css" />
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<script
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language="javascript"
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src="../../../../common/script/jquery.js"
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type="text/javascript"
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></script>
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<script
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language="javascript"
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src="../../../../common/script/pintuer.js"
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type="text/javascript"
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></script>
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<script
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language="javascript"
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src="../../../../common/script/jquery.bs.js"
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type="text/javascript"
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></script>
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<script src="v6.12.0/build/ol.js"></script>
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<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
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<!-- <link rel="stylesheet" href="http://openlayers.org/en/v3.3.0/css/ol.css" type="text/css">
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<script src="http://openlayers.org/en/v3.3.0/build/ol.js" type="text/javascript"></script> -->
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<style>
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html,
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body {
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width: 100%;
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height: 100%;
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}
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.map {
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height: 800px;
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width: 100%;
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}
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</style>
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</head>
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<body>
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<div id="map" style="width: 100%; height: 100%"></div>
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<script type="text/javascript">
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var key = 'a4f4b6000cb9d1bf148bb77452000f30';
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var highlightStyle = new ol.style.Style({
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stroke: new ol.style.Stroke({
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color: '#f00',
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width: 1,
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}),
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fill: new ol.style.Fill({
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color: 'rgba(255,0,0,0.1)',
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}),
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});
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var view = new ol.View({
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center: ol.proj.transform([37.41, 8.82], 'EPSG:4326', 'EPSG:3857'),
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zoom: 4,
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});
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var highlightSource = new ol.source.Vector({
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projection: 'EPSG:3857',
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url: 'https://openlayers.org/en/latest/examples/data/geojson/countries.geojson', //从文件加载边界等地理信息
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format: new ol.format.GeoJSON(),
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strategy: ol.loadingstrategy.bbox,
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});
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var highlightLayer = new ol.layer.Vector({
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source: highlightSource,
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style: function (feature, resolution) {
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style.getText().setText(resolution < 5000 ? feature.get('name') : ''); //当放大到1:5000分辨率时，显示国家名字
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return [style];
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},
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});
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const variables = {
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exposure: 0.3,
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contrast: 0.3,
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saturation: 0.28,
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};
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var map = new ol.Map({
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//初始化map
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target: 'map',
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layers: [
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new ol.layer.WebGLTile({
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style: {
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exposure: ['var', 'exposure'],
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contrast: ['var', 'contrast'],
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saturation: ['var', 'saturation'],
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variables: variables,
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},
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source: new ol.source.XYZ({
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url:
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'http://t{0-7}.tianditu.com/DataServer?T=img_w&x={x}&y={y}&l={z}&tk=' +
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key, //天地图
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}),
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}),
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highlightLayer,
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],
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view: view,
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});
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/**
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* 定义矢量图层
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* 其中style是矢量图层的显示样式
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*/
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var style = new ol.style.Style({
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fill: new ol.style.Fill({
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//矢量图层填充颜色，以及透明度
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color: 'rgba(255, 255, 255, 0.6)',
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}),
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stroke: new ol.style.Stroke({
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//边界样式
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color: 'blue',
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width: 1,
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}),
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text: new ol.style.Text({
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//文本样式
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font: '12px Calibri,sans-serif',
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fill: new ol.style.Fill({
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color: 'blue',
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}),
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stroke: new ol.style.Stroke({
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color: '#fff',
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width: 3,
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}),
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}),
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});
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var boxSelect = new ol.interaction.Select();
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var selectedFeatures = boxSelect.getFeatures();
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function addHighlightLayer(name) {
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//每次执行点击事件需清除之前的
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selectedFeatures.clear();
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//引入中国地图的geojson格式数据
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$.getJSON(
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'https://openlayers.org/en/latest/examples/data/geojson/countries.geojson',
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function (data) {
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var features = new ol.format.GeoJSON().readFeatures(data);
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features.forEach(function (element) {
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let jsonName = element.get('name');
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//如果点击的区域名称等于jeojson数据中的名称，则高亮显示
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if (jsonName === name) {
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var styles = new ol.style.Style({
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stroke: new ol.style.Stroke({
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color: 'red',
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width: 1,
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}),
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fill: new ol.style.Fill({
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color: 'rgba(255, 255, 255, 0.6)',
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}),
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});
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highlightLayer.getSource().clear();
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highlightLayer.getSource().addFeature(element);
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highlightLayer.setStyle(styles);
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}
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});
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}
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);
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}
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//地图点击事件
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map.on('click', function (e) {
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let zoom = map.getView().getZoom();
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let pixel = map.getEventPixel(e.originalEvent);
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var feature = map.forEachFeatureAtPixel(pixel, function (feature) {
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return feature;
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});
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if (feature != null) {
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let coodinate = e.coordinate;
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//设置地图中心点和缩放级别，如不需要可省略
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view.setCenter(coodinate);
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view.animate({
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zoom: 5,
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duration: 1000,
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});
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//引用区域高亮方法
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addHighlightLayer(feature.A.name);
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//darkenLayer();
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}
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});
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function darkenLayer() {
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$.getJSON(
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'https://openlayers.org/en/latest/examples/data/geojson/countries.geojson',
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function (data) {
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var fts = new ol.format.GeoJSON().readFeatures(data);
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var ft = fts[0];
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var darkenGeom = erase(ft.getGeometry());
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var darkentFt = new ol.Feature({
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geometry: darkenGeom,
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});
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highlightLayer.getSource().addFeature(darkentFt);
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}
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);
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}
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// 变暗图层范围
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function erase(geom) {
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var extent = [-180, -90, 180, 90];
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var polygonRing = ol.geom.Polygon.fromExtent(extent);
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var coords = geom.getCoordinates();
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coords.forEach(coord => {
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var linearRing = new ol.geom.LinearRing(coord[0]);
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polygonRing.appendLinearRing(linearRing);
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});
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return polygonRing;
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}
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</script>
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</body>
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<style lang="css">
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#map {
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width: 100%;
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height: 100%;
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position: relative;
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}
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</style>
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</html>
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