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第二篇 arcgis api for js 根据坐标生成点

2015-08-16 23:25 876 查看

要点

1、生成点要素

2、地图加载顺序及map.on事件顺序；

3、分析两种不同图层加载方式对点生成的影响；

可运行代码：

</pre><pre>

<%--
Created by IntelliJ IDEA.
User: neil
Date: 2015/8/16
Time: 18:48
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>SimpleMarkerSymbol with SVG Path - Simplified</title>
<link rel="stylesheet" href="http://js.arcgis.com/3.14/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="http://js.arcgis.com/3.14/dojox/widget/ColorPicker/ColorPicker.css">
<link rel="stylesheet" href="http://js.arcgis.com/3.14/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}

</style>
<script src="http://js.arcgis.com/3.14/"></script>
<script>
var map;

require([
"esri/map", "esri/geometry/Point", "esri/SpatialReference",
"esri/symbols/SimpleMarkerSymbol", "esri/graphic"
], function(Map, Point, SpatialReference, SimpleMarkerSymbol, Graphic) {
map = new Map("map", {
basemap: "topo",
center: [113, 37],
zoom: 13
});
map.on("load", function() { ShowLocation(113,37); });

function ShowLocation(x, y) {
var point = new Point(x, y, new SpatialReference({wkid:4326}));
var simpleMarkerSymbol = new SimpleMarkerSymbol();
var graphic = new Graphic(point, simpleMarkerSymbol);

map.graphics.add(graphic);
};
});
</script>
</head>
<div id="map"></div>
</body>
</html>

注意，只有当map.on事件紧跟map=new Map(...);之后，才能正常显示点；

下面换成另一种方式加载瓦片图层，将上面方法代码替换如下：

function(Map, Tiled,Point, SpatialReference, SimpleMarkerSymbol, Graphic) {
map = new Map("map");

map.on("load", function() { ShowLocation(113,37); });

var tiled = new Tiled("http://server.arcgisonline.com/arcgis/rest/services/World_Topo_Map/MapServer");
map.addLayer(tiled);

function ShowLocation(x, y) {
var point = new Point(x, y, new SpatialReference({wkid:4326}));
var simpleMarkerSymbol = new SimpleMarkerSymbol();
var graphic = new Graphic(point, simpleMarkerSymbol);

map.graphics.add(graphic);
};

采用第二种方式同样可以生成点。下面采用第三种方式，待续……

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