arcgis js 3.x版本加载geojson数据
2018-05-31 本文已影响5人
gis杭州
先看目录结构
image.png
效果图：
image.png
完整代码如下：
jianganqu.html
<!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>arcgisDynamicMapServiceLayer</title>
<link rel="stylesheet" type="text/css"
href="https://js.arcgis.com/3.20/esri/css/esri.css"/>
<script>var dojoConfig = {
parseOnLoad: true,
packages: [{
"name": "myModules",
"location": location.pathname.replace(/\/[^/]+$/, "") + "/myModules"
}]
};
</script>
<script type="text/javascript" src="https://js.arcgis.com/3.20/init.js"></script>
<script src="https://unpkg.com/terraformer@1.0.8"></script>
<script src="https://unpkg.com/terraformer-arcgis-parser@1.0.5"></script>
<style>
html, body, #map {
height: 100%;
margin: 0;
padding: 0;
}
</style>
<script>
var map;
require(["esri/map","myModules/geojsonlayer","esri/layers/ArcGISDynamicMapServiceLayer",
"esri/geometry/jsonUtils", "dojo/on", "dojo/domReady!"],
function (Map, GeoJsonLayer,ArcGISDynamicMapServiceLayer,geometryJsonUtils,on) {
map = new Map("map", {
zoom: 10,
maxZoom: 18,
// minZoom: 8,
center: [120.243, 30.256],
logo: false
});
var geoqtiledUrl = "http://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineCommunity/MapServer";
var geoqTiledLayer = new esri.layers.ArcGISTiledMapServiceLayer(geoqtiledUrl);
map.addLayer(geoqTiledLayer);
var geoJsonLayer = new GeoJsonLayer({
url: "data/jiangganoutline.geojson"
});
map.addLayer(geoJsonLayer);
});
</script>
</head>
<body>
<div id="map"></div>
</body>
</html>
jiangganoutline.geojson （可以用GitHub上链接代替：https://lxqjss.github.io/data/jiangganoutline.geojson）
{
"type": "FeatureCollection",
"features": [
{ "type": "Feature", "properties": { "Id": 0 }, "geometry": { "type": "Polygon", "coordinates": [ [ [180, 90], [180, -90], [-180, -90], [-180,90], [180,90] ], [ [ 120.23581545625348, 30.387234733170715 ], [ 120.22793061696586, 30.378649091144439 ], [ 120.22993326187134, 30.376503324259886 ], [ 120.23186445236206, 30.377671479655078 ], [ 120.232889699255, 30.376884626857759 ], [ 120.23472561762912, 30.374715256402908 ], [ 120.23753893270623, 30.372831701970483 ], [ 120.23727672058169, 30.372354698010952 ], [ 120.23610835007287, 30.370042204267634 ], [ 120.23746747960104, 30.368993139672966 ], [ 120.24110326892708, 30.371360778481176 ], [ 120.24174699909065, 30.370645379771304 ], [ 120.24199606783441, 30.368052113062731 ], [ 120.24312973022461, 30.367755889892635 ], [ 120.24454593658447, 30.366253852844295 ], [ 120.24476051330566, 30.364623069763297 ], [ 120.24253599680378, 30.361807394656353 ], [ 120.23943482621701, 30.360850650013219 ], [ 120.24046307815308, 30.360505557400757 ], [ 120.24054654881184, 30.358931958871949 ], [ 120.23916542530071, 30.358291876309522 ], [ 120.23942474173975, 30.355887436853607 ], [ 120.23980615173059, 30.354862296699196 ], [ 120.23849487304699, 30.352716529487282 ], [ 120.23295997365494, 30.349512094344448 ], [ 120.22620021725754, 30.344954752909018 ], [ 120.22826642809389, 30.341758846843675 ], [ 120.22414440980367, 30.338666367897531 ], [ 120.22559859666217, 30.337021208542808 ], [ 120.22493104879686, 30.336520600685617 ], [ 120.22381052847788, 30.336782813465106 ], [ 120.22369143865944, 30.336353660022723 ], [ 120.22314298061247, 30.336091447243234 ], [ 120.22257070420903, 30.336282206262638 ], [ 120.22121179012174, 30.33618671935983 ], [ 120.2208017349767, 30.334427404377607 ], [ 120.21966211766994, 30.334184075109022 ], [ 120.21923296422756, 30.33396949838783 ], [ 120.21813626226503, 30.3331826459181 ], [ 120.22035348323698, 30.332872797080313 ], [ 120.22016272421763, 30.332371975091633 ], [ 120.21947135865048, 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]
}
geojsonlayer.js
( Esri/geojson-layer-js）
define([
"dojo/_base/declare",
"esri/graphic",
"esri/layers/GraphicsLayer",
"esri/InfoTemplate",
"esri/graphicsUtils",
"esri/Color",
"esri/symbols/SimpleMarkerSymbol",
"esri/symbols/SimpleLineSymbol",
"esri/symbols/SimpleFillSymbol",
"esri/renderers/SimpleRenderer",
"esri/SpatialReference",
"esri/geometry/webMercatorUtils",
"esri/request",
"esri/config",
"dojo/_base/url",
"dojo/_base/lang"
], function (declare, Graphic, GraphicsLayer, InfoTemplate, graphicsUtils, Color, SimpleMarkerSymbol,
SimpleLineSymbol, SimpleFillSymbol, SimpleRenderer, SpatialReference, webMercatorUtils, esriRequest, esriConfig, Url, lang
) {
return declare([GraphicsLayer], {
// Required Terrformer library reference
_terrafomer: (typeof Terraformer !== 'undefined') ? Terraformer : null,
constructor: function (options) {
// options:
// url: String
// Path to file or server endpoint. Server must be on the same domain or cors enabled. Or use a proxy.
// data: Object[]
// Optional: FeatureCollection of GeoJson features. This will override url if both are provided.
// maxdraw: Number
// Optional: The maximum graphics to render. Default is 1000.
this._validState = true;
// First look for url
this._url = options.url;
// Accept data as geojson features array. This will override options.url!
this._data = options.data;
// GeoJSON spatial reference (not optional)
this._inSpatialReference = new SpatialReference({wkid: 4326}); // Data must be in Geographic Coordinates
// GeoJSON transformation (optional)
this._outSpatialReference = null;
// Default popup
if (options.infoTemplate !== false) {
this.setInfoTemplate(options.infoTemplate || new InfoTemplate("GeoJSON Data", "${*}"));
}
// Renderer
if (options.renderer) {
this.renderer = options.renderer;
}
// Default symbols
this._setDefaultSymbols();
// Enable browser to make cross-domain requests
this._setCorsSevers();
this._setXhrDefaults(10000);
// Manage drawing
this._maxDraw = options.maxdraw || 1000; // default to 1000 graphics
this._drawCount = 0;
this._drawCountTotal = 0;
// Extended public properties
this.extent = null;
// Graphics layer does not call onLoad natively but we'll call it after features have been added to layer
if (options.onLoad && typeof options.onLoad === 'function') {
this.onLoad = options.onLoad;
}
// Make sure the environment is good to go!
this._updateState();
},
_setDefaultSymbols: function () {
function getRandomColor(mainColor, transparency) {
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
switch (mainColor) {
case "red":
return new Color([getRandomInt(150, 255), getRandomInt(0, 255), getRandomInt(0, 255), transparency]);
case "green":
return new Color([getRandomInt(0, 155), getRandomInt(150, 255), getRandomInt(0, 155), transparency]);
case "blue":
return new Color([getRandomInt(0, 255), getRandomInt(0, 255), getRandomInt(150, 255), transparency]);
}
}
// Random colors
// this._simplePointSym = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 8,
// new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, getRandomColor("blue", 0.5), 1),
// getRandomColor("blue", 0.75));
// this._simpleLineSym = new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, getRandomColor("red", 0.9), 2);
// this._simplePolygonSym = new SimpleFillSymbol("solid",
// new SimpleLineSymbol("solid", new Color([50, 50, 50, 0.15]), 1),
// getRandomColor("green", 0.15));
// Option to hardcod colors here
this._simplePointSym = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 8,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, new Color([150, 150, 150]), 0.5),
new Color([50, 130, 255, 0.75]));
this._simpleLineSym = new SimpleLineSymbol("solid", new Color([255, 50, 50, 0.75]), 2);
this._simplePolygonSym = new SimpleFillSymbol("solid",
new SimpleLineSymbol("solid", new Color([0, 0, 0, 0.10]), 1),
new Color([0, 0, 0, 0.30]));
},
_setCorsSevers: function () {
// Allow browser to make cross-domain requests
esriConfig.defaults.io.corsEnabledServers.push("http://sampleserver6.arcgisonline.com");
// Add server
if (this._url) {
var url = new Url(this._url),
scheme = url.scheme,
host = url.host,
port = url.port,
server = scheme + "://" + host; // + "/"; // + (port ? port : ""); // TODO
if (scheme && host) {
esriConfig.defaults.io.corsEnabledServers.push(server);
}
}
},
_setXhrDefaults: function (postSize) {
esriConfig.defaults.io.postLength = postSize; // max size of post request
},
_updateState: function () {
if (!this._inSpatialReference) {
this._validState = false;
console.error("GeoJsonLayer Error: Invalid SpatialReference.");
}
if (!this._terrafomer) {
this._validState = false;
console.error("GeoJsonLayer Error: Invalid Terraformer reference. Please add a reference to your html page.");
}
},
// GraphicLayer overrides
_setMap: function (map, surface) {
var div = this.inherited(arguments);
// Check spatial reference
if (!this._validState) {
return div;
}
// Set sr if need to project
this._outSpatialReference = map.spatialReference;
// Load GeoJSON as graphics
this._loadGeoJson();
// Return div - sets this.id
return div;
},
_unsetMap: function () {
return this.inherited(arguments);
},
add: function (graphic) {
if (!this._validState) {
return;
}
// Can do more with graphic if needed
this.inherited(arguments);
this._incrementDrawCount();
return;
},
clear: function () {
this._drawCount = 0;
this._drawCountMax = 0;
return this.inherited(arguments);
},
// GeoJsonLayer class functions
_loadGeoJson: function () {
if (this._data) {
// Load data
this._getGeoJson(this._data);
} else if (this._url) {
// XHR request
this._getGeoJsonXhr(this._url);
}
},
_getGeoJsonXhr: function (url) {
// xhr request to get data
var requestHandle = esriRequest({
url: url,
handleAs: "json"
});
requestHandle.then(lang.hitch(this, this._getGeoJson),
lang.hitch(this, this._errorGetGeoJsonXhr));
},
_getGeoJson: function (geojson) {
// Check data
if (geojson.type !== "FeatureCollection" || !geojson.features) {
console.error("GeoJsonLayer Error: Invalid GeoJSON FeatureCollection. Check url or data structure.");
return;
}
// Convert GeoJSON to ArcGIS JSON
var arcgisJson = this._terraformerConverter(geojson);
// Add graphics to layer
this._addGraphics(arcgisJson);
},
// GeoJSON to ArcGIS JSON
_terraformerConverter: function (geojson) {
var json,
arcgis;
// Convert the geojson object to a Primitive json representation
json = new this._terrafomer.Primitive(geojson);
// Convert to ArcGIS JSON
arcgis = this._terrafomer.ArcGIS.convert(json);
return arcgis;
},
_errorGetGeoJsonXhr: function (e) {
console.error("GeoJsonLayer Error: Couldn't load GeoJSON. Check url. File must be on the same domain or server must be CORS enabled.\n\n" + e);
},
_incrementDrawCount: function () {
this._drawCount++;
if (this._drawCount === this._drawCountTotal) {
this._updateLayerExtent();
this.onUpdateEnd();
}
},
_decrementDrawCount: function () {
this._drawCountTotal--;
},
_updateLayerExtent: function () {
var extent;
if (this.graphics.length) {
extent = graphicsUtils.graphicsExtent(this.graphics);
}
this.extent = extent;
},
// Type functions
_getEsriSymbol: function (geometryType) {
var sym;
switch (geometryType) {
case "point":
sym = this._simplePointSym;
break;
case "multipoint":
sym = this._simplePointSym;
break;
case "polyline":
sym = this._simpleLineSym;
break;
case "polygon":
sym = this._simplePolygonSym;
break;
case "extent":
sym = this._simplePolygonSym;
break;
}
return sym;
},
_addGraphicToLayer: function (graphic) {
// Add or project and then add graphic
if (this._inSpatialReference.wkid === 4326 || this._inSpatialReference.wkid === 102100) {
// ArcGIS API automatically translates between these!
// if (graphic.geometry.spatialReference.wkid === 4326) {
// graphic.setGeometry(webMercatorUtils.geographicToWebMercator(graphic.geometry));
// }
// Add graphic directly
this.add(graphic);
}
},
_createGraphic: function (arcgisJson) {
var graphic;
// This magically sets geometry type!
graphic = new Graphic(arcgisJson);
// Set the correct symbol based on type and render - NOTE: Only supports simple renderers
if (this.renderer && this.renderer.symbol) {
//graphic.setSymbol(this.render.getSymbol(graphic)); // use for complex renderers
graphic.setSymbol(this.renderer.symbol);
} else {
graphic.setSymbol(this._getEsriSymbol(graphic.geometry.type));
}
// Update SR because terraformer sets incorrect spatial reference
graphic.geometry.setSpatialReference(this._inSpatialReference); // NOTE: Has to match features!
return graphic;
},
_addGraphics: function (arcgisJson) {
var i,
feature,
graphic;
// Limit size of data that can be drawn
if (arcgisJson.length > this._maxDraw) {
this._drawCountTotal = this._maxDraw;
console.warn("GeoJsonLayer Warning: Large dataset detected. Only drawing the first " + this._maxDraw + " features!");
} else {
this._drawCountTotal = arcgisJson.length;
}
// Add graphics to the layer with symbols, project if needed
for (i = 0; i < this._drawCountTotal; i++) {
feature = arcgisJson[i];
// Create graphic - magically sets the geometry type!
graphic = this._createGraphic(feature);
// Add to layer
this._addGraphicToLayer(graphic);
}
// Call onLoad
// emit mixes in `layer` and `target` properties as event object
// onLoad provided via constructor just returns `layer` object
this.onLoad(this);
}
});
});
更多参考：
