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Arcgis for JS之Cluster聚类分析的实现(基于区域范围的)

2024-07-31 07:16:57   224人阅读

咱们书接上文，在上文，实现了基于距离的空间聚类的算法实现，在本文，将继续介绍空间聚类之基于区域范围的实现方式，好了，闲言少叙，先看看具体的效果：


聚类效果


点击显示信息


显示单个聚类点

下面说说具体的实现思路。

1、数据组织

在进行数据组织的时候，因为是要按照区域范围的，所以必须得包含区域范围的信息，在本示例中，我用的数据依然是全国2000多个区县点的数据，并添加了省市代码，数据如下：


2、聚类思路

根据数据中“procode”去判断类别，是同一类别就将该类别添加到该类别的数据中，并将计数增加1，思路很简单，对graphiclayer进行了扩展，源代码如下：

define([
    "dojo/_base/declare",
    "dojo/_base/array",
    "esri/Color",
    "dojo/_base/connect",

    "esri/SpatialReference",
    "esri/geometry/Point",
    "esri/graphic",
    "esri/symbols/SimpleMarkerSymbol",
    "esri/symbols/TextSymbol",

    "esri/dijit/PopupTemplate",
    "esri/layers/GraphicsLayer"
], function (
    declare, arrayUtils, Color, connect,
    SpatialReference, Point, Graphic, SimpleMarkerSymbol, TextSymbol,
    PopupTemplate, GraphicsLayer
    ) {
    return declare([GraphicsLayer], {
        constructor: function(options) {
            // 参数:
            //   data:  Object[]
            //     Array of objects. Required. Object are required to have properties named x, y and attributes. The x and y coordinates have to be numbers that represent a points coordinates.
            //   field:  string?
            //     The field of cluster.
            //   showSingles:  Boolean?
            //     Optional. Whether or graphics should be displayed when a cluster graphic is clicked. Default is true.
            //   labelColor:  String?
            //     Optional. Hex string or array of rgba values used as the color for cluster labels. Default value is #fff (white).
            //   labelOffset:  String?
            //     Optional. Number of pixels to shift a cluster label vertically. Defaults to -5 to align labels with circle symbols. Does not work in IE.
            //   singleSymbol:  MarkerSymbol?
            //     Marker Symbol (picture or simple). Optional. Symbol to use for graphics that represent single points. Default is a small gray SimpleMarkerSymbol.
            //   spatialReference:  SpatialReference?
            //     Optional. Spatial reference for all graphics in the layer. This has to match the spatial reference of the map. Default is 102100. Omit this if the map uses basemaps in web mercator.
            //   singleTemplate:  PopupTemplate?
            //     PopupTemplate</a>. Optional. Popup template used to format attributes for graphics that represent single points. Default shows all attributes as "attribute = value" (not recommended).

            //聚类的字段
            this._clusterField = options.field || "";
            //聚类数据
            this._clusterData = http://www.mamicode.com/options.data || [];>接着将之导入，并调用：
        var dojoConfig = {
            paths: {
                extras: location.pathname.replace(/\/[^/]+$/, "") + "/extras"
            }
        };

        require([......
            "extras/ZoneClusterLayer",
            "dojo/domReady!"
        ], function(
            ......,
            ZoneClusterLayer
        ){
新建clusterlayer对象，并将之添加到map：
            function addClusters(items) {
                var countyInfo = {};
                countyInfo.data = http://www.mamicode.com/arrayUtils.map(items, function(item) {>
调用的html的全代码如下：
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Zone Cluster</title>
    <link rel="stylesheet" href=http://www.mamicode.com/"http://localhost/arcgis_js_api/library/3.9/3.9/js/dojo/dijit/themes/tundra/tundra.css">>
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Arcgis for JS之Cluster聚类分析的实现(基于区域范围的)


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