0.引言
ArcGIS API for JavaScript 是一个用于在Web和移动应用程序中创建交互式地图和地理空间分析应用的库。本文在ArcGIS For JavaScript中使用Graphic对象来创建包含图片样式的点要素。
1.加载底图
（1）实现代码
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Create Map</title>
<link rel="stylesheet" href="http://localhost:8099/arcgis_js_api/javascript/4.28/esri/themes/light/main.css" />
<script src="http://localhost:8099/arcgis_js_api/javascript/4.28/init.js"></script>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script type="text/javascript">
require(["esri/Map",
"esri/Basemap",
"esri/layers/TileLayer",
"esri/views/MapView",
"esri/layers/GraphicsLayer",
"esri/Graphic"
], (
Map,
Basemap,
TileLayer,
MapView,
GraphicsLayer,
Graphic
)=>{
//添加底图
var lyTile = new TileLayer({
url:"http://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer"
});
var baseMap = new Basemap({
baseLayers: [lyTile]
});
var map = new Map({
basemap: baseMap
});
var view = new MapView({
container: "viewDiv",
map: map,
zoom: 16,
center: [106.56657791438427, 29.679927608558902]
});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
（2）实现结果
2.获取点要素的坐标
（1）实现代码
//点击地图获取经纬度坐标
view.on("click", evt => {
let mapPoint = evt.mapPoint;
alert(`经度：${mapPoint.longitude},纬度${mapPoint.latitude}`);
});
（2）实现结果
以上获取的坐标作为点要素的坐标，为（经度：106.56651354136791,纬度29.68001149992497）。
3.添加含图片样式的几何要素
（1）实现代码
//添加含图片样式的几何要素
var graphic = new Graphic({
geometry: point,
symbol: symbol
});
var graphicsLayer = new GraphicsLayer();
graphicsLayer.visible = true;
var point = {
type: "point",
x: 106.56657791438427,
y: 29.679927608558902,
SpatialReference: 3857
};
var symbol = {
type: "picture-marker",
url:"http://img14.360buyimg.com/n1/jfs/t2149/268/1108858690/251183/f7d770d0/5678c41eN59e3de7f.jpg",//访问小车图片
width: "50px",
height: "50px",
outline: {
style: "solid"
},
};
var attributes = { name: '小车', content: '真是一辆漂亮的小车' };
var popupTemplate1 = {
title: "标题:" + attributes.name,
content: "内容:" + attributes.content
};
var graphic = new Graphic({
geometry: point,
symbol: symbol,
popupTemplate: popupTemplate1,
});
graphicsLayer.graphics.add(graphic);
map.add(graphicsLayer);
（2）实现结果
4.完整实现
（1）完整代码
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Create Map</title>
<link rel="stylesheet" href="http://localhost:8099/arcgis_js_api/javascript/4.28/esri/themes/light/main.css" />
<script src="http://localhost:8099/arcgis_js_api/javascript/4.28/init.js"></script>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script type="text/javascript">
require(["esri/Map",
"esri/Basemap",
"esri/layers/TileLayer",
"esri/views/MapView",
"esri/layers/GraphicsLayer",
"esri/Graphic"
], (
Map,
Basemap,
TileLayer,
MapView,
GraphicsLayer,
Graphic
)=>{
//添加底图
var lyTile = new TileLayer({
url:"http://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer"
});
var graphic = new Graphic({
geometry: point,
symbol: symbol
});
//创建一个图层
var graphicsLayer = new GraphicsLayer();
//设置可见
graphicsLayer.visible = true;
//创建一个面
var point = {
type: "point",
x: 106.56657791438427,
y: 29.679927608558902,
SpatialReference: 3857
};
var symbol = {
type: "picture-marker",
url:"http://img14.360buyimg.com/n1/jfs/t2149/268/1108858690/251183/f7d770d0/5678c41eN59e3de7f.jpg",//访问小车图片
width: "50px",
height: "50px",
outline: {
style: "solid"
},
};
var attributes = { name: '小车', content: '真是一辆漂亮的小车' };
var popupTemplate1 = {
title: "标题:" + attributes.name,
content: "内容:" + attributes.content
};
var graphic = new Graphic({
geometry: point,
symbol: symbol,
popupTemplate: popupTemplate1,
});
graphicsLayer.graphics.add(graphic);
var baseMap = new Basemap({
baseLayers: [lyTile]
});
var map = new Map({
basemap: baseMap
});
map.add(graphicsLayer)
var view = new MapView({
container: "viewDiv", // Reference to the DOM node that will contain the view
map: map, // References the map object created in step 3
zoom: 16,
center: [106.56657791438427, 29.679927608558902]
});
//点击地图获取经纬度坐标
//view.on("click", evt => {
// let mapPoint = evt.mapPoint;
// alert(`经度：${mapPoint.longitude},纬度${mapPoint.latitude}`);
//});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
（2）实现结果
参考资料：
[1] 一入GIS深似海. 不一样的前端，JavaScript之arcgis api教程; 2020-11-02 [accessed 2024-02-22].
[2] 半个GIS半个前端. arcgis api（三）arcgis api for js 4.x 加载高德地图、谷歌地图、天地图; 2018-08-17 [accessed 2024-02-22].
[3] 前端三脚猫. js中的变量声明（var、let、const的区别和解析）; 2021-03-08 [accessed 2024-02-22].