openlayers加载geoJson格式文件(并加载json中的样式)
json
适用于现代 C++ 的 JSON。
项目地址:https://gitcode.com/gh_mirrors/js/json
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openlayers加载geoJson格式文件(并加载json中的样式)
样式如下图:
话不多说直接上代码和注释(geojson文件可以在我的CSDN中下载)下载
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="./ol/ol.css" type="text/css">
<script src="./ol/ol.js"></script>
<title>map</title>
<style>
.map {
width: 100%;
height: 100%;
}
.ol-popup {
position: absolute;
background-color: white;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
padding: 15px;
border-radius: 10px;
border: 1px solid #cccccc;
bottom: 12px;
left: -50px;
min-width: 280px;
}
.ol-popup:after,
.ol-popup:before {
top: 100%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
}
.ol-popup:after {
border-top-color: white;
border-width: 10px;
left: 48px;
margin-left: -10px;
}
.ol-popup:before {
border-top-color: #cccccc;
border-width: 11px;
left: 48px;
margin-left: -11px;
}
.ol-popup-closer {
text-decoration: none;
position: absolute;
top: 2px;
right: 8px;
}
.ol-popup-closer:after {
content: "✖";
}
</style>
</head>
<body>
<div id="popup" class="ol-popup">
<a href="#" id="popup-closer" class="ol-popup-closer"></a>
<div id="popup-content"></div>
</div>
<div id="map" class="map"></div>
<script>
/**
* 使用变量缓存弹窗需要的DOM对象
*/
var container = document.getElementById("popup");
var content = document.getElementById("popup-content");
var closer = document.getElementById("popup-closer");
/**
*将十六进制的颜色值转为RGB格式
*/
function colorRgba(sHex, alpha) {
// 十六进制颜色值的正则表达式
var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/
/* 16进制颜色转为RGB格式 */
let sColor = sHex.toLowerCase()
if (sColor && reg.test(sColor)) {
if (sColor.length === 4) {
var sColorNew = '#'
for (let i = 1; i < 4; i += 1) {
sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1))
}
sColor = sColorNew
}
// 处理六位的颜色值
var sColorChange = []
for (let i = 1; i < 7; i += 2) {
sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)))
}
// return sColorChange.join(',')
// 或
return 'rgba(' + sColorChange.join(',') + ',' + alpha + ')'
} else {
return sColor
}
}
var styleFunction = function(feature) {
return new ol.style.Style({
stroke: new ol.style.Stroke({
color: feature.get('stroke'),//通过要素拿到具体的值
width: 2,
opacity: 1
}),
fill: new ol.style.Fill({
color: colorRgba(feature.get('fill'), feature.get('fill-opacity')),
///opacity: feature.get('fill-opacity')
}),
text: new ol.style.Text({
text: feature.get('name'),
font: '12px bold serif',
fill: new ol.style.Fill({
color: '#000'
}),
stroke: new ol.style.Stroke({
color: '#fff',
width: 2
})
})
})
};
/**
*创建图层渲染geoJson文件
*/
var layers = [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
new ol.layer.Vector({
title: 'add Layer',
source: new ol.source.Vector({
projection: 'EPSG:4326',
url: "./json/map.geojson", //GeoJSON的文件路径,用户可以根据需求而改变
format: new ol.format.GeoJSON()
}),
style: styleFunction
})
];
/*
创建一个Overlay叠加层对象用作显示弹窗
*/
var overlay = new ol.Overlay({
element: container,
// autoPan: true,
autoPanAnimation: {
duration: 250
}
});
var map = new ol.Map({
target: 'map',
layers: layers,
overlays: [overlay],
view: new ol.View({
center: ol.proj.fromLonLat([112.9518190800, 28.2411883300]),
zoom: 15
})
});
/**
* 为弹窗添加一个响应关闭的函数
*/
closer.onclick = function() {
overlay.setPosition(undefined);
closer.blur();
return false;
};
/**
* 添加单击响应函数来处理弹窗动作
*/
map.on("click", function(e) {
/* var feature = map.getFeaturesAtPixel(e.pixel);
console.log(feature) */
var pixel = map.getEventPixel(e.originalEvent);
var hit = map.hasFeatureAtPixel(pixel);
//获取到当前像素下的feature
var feature = map.forEachFeatureAtPixel(pixel, function (feature, layer) {
return feature;
});
console.log(feature)
var coordinate = e.coordinate;
content.innerHTML = "<p>你点击了这里:</p><code>" + feature.values_.name + "</code>";
overlay.setPosition(coordinate);
});
</script>
</body>
</html>
GitHub 加速计划 / js / json
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适用于现代 C++ 的 JSON。
最近提交(Master分支:1 个月前 )
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