02 - ArcGIS For JavaScript-矢量数据的符号化处理（Symbol）-编程知识

文章目录

综述
Symbol的分类
Point的符号化
- Point符号化为二维几何：
- Point位图符号化：
- Point的三维结合符号化
- Point 符号化为GLTF模型
PolylineSymbol-线符号化
- 基本样式
- 管道样式
- 墙体样式
- 条带样式
- 方管样式
PolygonSymbol-面符号化
- 水面效果
- 拉伸效果
- 填充效果
MeshSymbol
结语

综述

ArcGIS中的符号化，及将矢量数据（点、线、面）通过给其设置颜色、边框、样式实例化为一个具化的对象。
ArcGIS提供了Symbol去处理符号化问题。Symbol定义如何在GraphicLayer上如何显示点、线、面、文本，符号定义了几何对象所有的非地理特征方面的外观，例如图形的颜色，边框线样式，api中有许多的符号类，每个类都只允许你使用唯一的方式去制定符号。每种符号都用于一种特定的类型。
在这里插入图片描述

在这里插入图片描述

Symbol的分类

在ArcGIS中有多种Symbol符号化类，大致可分为四类：

PointSymbol
PolylineSymbol
PolygonSymbol
MeshSymbol

Point的符号化

对于点数据，我们一般可以做一下几种符号化处理：

符号化为二维的几何
符号化为位图
符号化为三维几何
符号化为GLTF模型

Point符号化为二维几何：

const iconSymbolForGeometry = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "icon", // autocasts as new IconSymbol3DLayer()size: 24,resource: {primitive: "square"},material: {color: "orange"},outline: {color: "white",size: 1}}]};

结果：
在这里插入图片描述

Point位图符号化：

const iconSymbolForImage = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "icon", // autocasts as new IconSymbol3DLayer()size: 24,resource: {href: './img/city.png'},material: {color: "orange"},outline: {color: "white",size: 1}}]};

结果：
在这里插入图片描述

Point的三维结合符号化

const objectSymbolForGeometry = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "object", // autocasts as new ObjectSymbol3DLayer()width: 70000,height: 100000,resource: {primitive: "cone" //三维圆锥},material: {color: "#FFD700"}}]};

结果：
在这里插入图片描述

Point 符号化为GLTF模型

const objectSymbolForGLTF = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "object", // autocasts as new ObjectSymbol3DLayer()width: 70000,height: 100000,resource: {//   primitive: "cone"href: "./datas/Tractor.glb"},material: {color: "#FFD700"}}]};

结果：
在这里插入图片描述
然后将符号化设置赋值给featurelayer对象就能实现符号化的操作：

const objectSymbolRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: objectSymbolForGeometry};
featureLayer.renderer = objectSymbolRenderer;

完成代码如下：

<html lang="en"><head><meta charset="utf-8" /><meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/><title>Point3DSymbol</title><style>html,body,#viewDiv {padding: 0;margin: 0;height: 100%;width: 100%;}#paneDiv {position: absolute;top: 18px;right: 18px;padding: 12px;background-color: rgba(0, 0, 0, 0.5);color: white;}</style><link rel="stylesheet" href="https://js.arcgis.com/4.27/esri/themes/light/main.css"/><script src="https://js.arcgis.com/4.27/"></script><script>require(["esri/Map","esri/views/SceneView","esri/layers/FeatureLayer","esri/layers/support/LabelClass","esri/layers/GeoJSONLayer"], (Map, SceneView, FeatureLayer, LabelClass, GeoJSONLayer) => {const map = new Map({basemap: "dark-gray-vector"});const view = new SceneView({container: "viewDiv",map: map,camera: {position: [109.5996,35.6396, 9326260]}});// Create iconSymbol and add to rendererconst iconSymbolForGeometry = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "icon", // autocasts as new IconSymbol3DLayer()size: 24,resource: {primitive: "square"},material: {color: "orange"},outline: {color: "white",size: 1}}]};const iconSymbolForImage = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "icon", // autocasts as new IconSymbol3DLayer()size: 24,resource: {href: './img/city.png'},material: {color: "orange"},outline: {color: "white",size: 1}}]};const iconSymbolRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: iconSymbolForGeometry};const iconSymbolForImageRender = {type: "simple", // autocasts as new SimpleRenderer()symbol: iconSymbolForImage}// Create objectSymbol and add to rendererconst objectSymbolForGeometry = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "object", // autocasts as new ObjectSymbol3DLayer()width: 70000,height: 100000,resource: {primitive: "cone" //三维圆锥},material: {color: "#FFD700"}}]};const objectSymbolForGLTF = {type: "point-3d", // autocasts as new PointSymbol3D()symbolLayers: [{type: "object", // autocasts as new ObjectSymbol3DLayer()width: 70000,height: 100000,resource: {//   primitive: "cone"href: "./datas/Tractor.glb"},material: {color: "#FFD700"}}]};const objectSymbolRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: objectSymbolForGeometry};const objectSymbolForGLTFRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: objectSymbolForGLTF};const labelClass = new LabelClass({symbol: {type: "label-3d", // autocasts as new LabelSymbol3D()symbolLayers: [{type: "text", // autocasts as new TextSymbol3DLayer()material: {color: "white"},size: 10}]},labelPlacement: "above-center",labelExpressionInfo: {//   expression: 'DefaultValue($feature.CITY_NAME, "no data")'expression: 'DefaultValue($feature.NAME, "no data")'}});const featureLayer = new GeoJSONLayer({url: "./datas/china.json",renderer: iconSymbolRenderer,outFields: ["NAME"],// Ensure that all features are shown at all scalesmaxScale: 0,minScale: 0,// labelingInfo: [labelClass]});map.add(featureLayer);// Register the events listener to toggle between objectSymbol and iconSymbolconst asIconForGeometry = document.getElementById("asIconForGeometry");const asIconForImage = document.getElementById("asIconForImage");const asObjectForGeometry = document.getElementById("asObjectForGeometry");const asObjectForGLTF = document.getElementById("asObjectForGLTF");asIconForGeometry.addEventListener("click", () => {featureLayer.renderer = iconSymbolRenderer;});asIconForImage.addEventListener("click", () => {featureLayer.renderer = iconSymbolForImageRender;});asObjectForGeometry.addEventListener("click", () => {featureLayer.renderer = objectSymbolRenderer;});asObjectForGLTF.addEventListener("click", () => {featureLayer.renderer = objectSymbolForGLTFRenderer;});});</script></head><body><div id="viewDiv"></div><div id="paneDiv" class="esri-widget"><div><input type="radio" name="symbolType" value="icon" checked="checked" id="asIconForGeometry"/><label for="asIconForGeometry">二维几何 </label></div><div><input type="radio" name="symbolType" value="icon"  id="asIconForImage"/><label for="asIconForImage">位图 </label></div><div><input type="radio" name="symbolType" value="object" id="asObjectForGeometry" /><label for="asObjectForGeometry">三维几何</label></div><div><input type="radio" name="symbolType" value="icon"  id="asObjectForGLTF"/><label for="asObjectForGLTF">GLTF模型</label></div></div></body></html>

china.json数据如下：

{"type": "FeatureCollection",
"features":
[
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}

PolylineSymbol-线符号化

线的符号化，一般我们会给线添加一些颜色或者样式修改，也可以将其符号化为path（包括管道、墙、方管、条带等样式）
直接上代码:

<html lang="en"><head><meta charset="utf-8" /><meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" /><title>符号化-LineSymbol</title><style>html,body,#viewDiv {padding: 0;margin: 0;height: 100%;width: 100%;}#paneDiv {position: absolute;top: 18px;right: 18px;padding: 12px;background-color: rgba(0, 0, 0, 0.5);color: white;}</style><link rel="stylesheet" href="https://js.arcgis.com/4.27/esri/themes/light/main.css" /><script src="https://js.arcgis.com/4.27/"></script><script>require(["esri/Map","esri/views/SceneView","esri/layers/FeatureLayer","esri/layers/support/LabelClass","esri/layers/GeoJSONLayer"], (Map, SceneView, FeatureLayer, LabelClass, GeoJSONLayer) => {const map = new Map({basemap: "dark-gray-vector"});// Create the SceneView and set initial cameraconst view = new SceneView({container: "viewDiv",map: map,camera: {position: [109.5996, 35.6396, 9326260],}});let lineSymbol = {type: "line-3d", // autocasts as new LineSymbol3D()// Add two symbolizations on top of each othersymbolLayers: [{//1.  White background line, transparenttype: "line", // autocasts as new LineSymbol3DLayer()material: {color: [255, 255, 255, 0.3]},size: "8px"},{// 2. Dashed line with arrows as markerstype: "line", // autocasts as new LineSymbol3DLayer()material: {color: [121, 72, 0]},size: "5px",pattern: {type: "style", // autocasts as new LineStylePattern3D()style: "long-dash"},marker: {type: "style", // autocasts as new LineStyleMarker3D()style: "arrow",placement: "end"}}]}let stripPath = {type: "line-3d",  // autocasts as new LineSymbol3D()symbolLayers: [{type: "path",  // autocasts as new PathSymbol3DLayer()profile: "quad",  // creates a rectangular shapewidth: 20,  // path width in metersheight: 5,  // path height in metersmaterial: { color: "#ff7380" },cap: "square",profileRotation: "heading"}]};// create a PathSymbol3DLayer with a pipe stylelet pipePath = {type: "line-3d",  // autocasts as new LineSymbol3D()symbolLayers: [{type: "path",  // autocasts as new PathSymbol3DLayer()profile: "circle",  // creates a rectangular shapewidth: 20,  // path width will also set the height to the same valuematerial: { color: "#ff7380" },cap: "round"}]};const squareTubeSymbol = {type: "line-3d",symbolLayers: [{type: "path",profile: "quad",material: {color: "#ff7380" },width: 30, // the width in mheight: 30 // the height in m}]}const wallSymbol = {type: "line-3d",symbolLayers: [{type: "path",profile: "quad",material: {color:"#ff7380" },width: 5, // the width in mheight: 30, // the height in manchor: "bottom", // the vertical anchor is set to the lowest point of the wallprofileRotation: "heading"}]}let pipePathRender = {type: "simple", // autocasts as new SimpleRenderer()symbol: pipePath}let stripPathRender = {type: "simple", // autocasts as new SimpleRenderer()symbol: stripPath}let squareTubeRender = {type: "simple", // autocasts as new SimpleRenderer()symbol: squareTubeSymbol}let lineSymbolRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: lineSymbol}let wallSymbolRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: wallSymbol}// Request feature layers and overwrite rendererconst featureLayer = new FeatureLayer({url:"http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/subway_tcl_stations_lines_wgs84/FeatureServer/0",elevationInfo: {mode: "absolute-height",offset: 50}// renderer: lineSymbolRenderer,});map.add(featureLayer);view.when(function () {view.extent = featureLayer.fullExtent;})document.getElementById("symbolBtn").addEventListener("click", function () {featureLayer.renderer = lineSymbolRenderer;// featureLayer.renderer = stripPathRender;})document.getElementById("pathCircle").addEventListener("click", function () {// featureLayer.renderer = lineSymbolRenderer;featureLayer.renderer = pipePathRender;})document.getElementById("pathStrip").addEventListener("click", function () {// featureLayer.renderer = lineSymbolRenderer;featureLayer.renderer = stripPathRender;})document.getElementById("pathSquareTube").addEventListener("click", function () {// featureLayer.renderer = lineSymbolRenderer;featureLayer.renderer = squareTubeRender;})document.getElementById("pathWall").addEventListener("click", function () {// featureLayer.renderer = lineSymbolRenderer;featureLayer.renderer = wallSymbolRenderer;})});</script>
</head><body><div id="viewDiv"></div><div id="paneDiv" class="esri-widget"><button id="symbolBtn">符号化</button><button id="pathCircle">管道样式</button><button id="pathWall">墙体</button><button id="pathStrip">条带样式</button><button id="pathSquareTube">方管样式</button></div>
</body></html>

基本样式

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管道样式

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墙体样式

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条带样式

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方管样式

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PolygonSymbol-面符号化

面的符号化常用的也就三种：

水面效果
拉伸效果
填充效果

代码如下：

<html lang="en"><head><meta charset="utf-8" /><meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" /><title>符号化-Point3DSymbol</title><style>html,body,#viewDiv {padding: 0;margin: 0;height: 100%;width: 100%;}#paneDiv {position: absolute;top: 18px;right: 18px;padding: 12px;background-color: rgba(0, 0, 0, 0.5);color: white;}</style><link rel="stylesheet" href="https://js.arcgis.com/4.27/esri/themes/light/main.css" /><script src="https://js.arcgis.com/4.27/"></script><script>require(["esri/Map","esri/views/SceneView","esri/layers/FeatureLayer","esri/layers/support/LabelClass","esri/layers/GeoJSONLayer"], (Map, SceneView, FeatureLayer, LabelClass, GeoJSONLayer) => {const map = new Map({basemap: "dark-gray-vector"});// Create the SceneView and set initial cameraconst view = new SceneView({container: "viewDiv",map: map,camera: {position: [109.5996, 35.6396, 9326260],//   tilt: 40}});view.popupEnabled = true;const extrudeRenderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: {type: "polygon-3d", // autocasts as new PolygonSymbol3D()symbolLayers: [{ type: "extrude" }] // autocasts as new ExtrudeSymbol3DLayer()},visualVariables: [{type: "size", // indicates this is a size visual variablefield: "childNum", // total population in povertynormalizationField: "childNum", // total populationstops: [{value: 0.1, // features where < 10% of the pop in povertysize: 10000 // will be extruded by this height in meters},{value: 0.5, // features where > 50% of the pop in povertysize: 500000 // will be extruded by this height in meters}]},{type: "color",field: "childNum",normalizationField: "childNum",stops: [{value: 0.1,color: "#FFFCD4",opacity: 0.3},{value: 0.35,color: [153, 83, 41]}]}]};let waterRenderer = {type: "simple",symbol: {type: "polygon-3d",symbolLayers: [{type: "water",waveDirection: 180,color: "#5975a3",waveStrength: "moderate",waterbodySize: "large"}]}}let fillRenderer = {type: "simple",symbol: {type: "polygon-3d",  // autocasts as new PolygonSymbol3D()symbolLayers: [{type: "fill",  // autocasts as new FillSymbol3DLayer()material: { color: "red" }}]}}const featureLayer = new GeoJSONLayer({url: "./datas/china.json",renderer: extrudeRenderer,hasZ: false,elevationInfo: {mode: "absolute-height",offset: 43000},outFields: ["*"],});map.add(featureLayer);document.getElementById("waterBtn").addEventListener("click", () => {featureLayer.renderer = waterRenderer;});document.getElementById("extrudeBtn").addEventListener("click", () => {featureLayer.renderer = extrudeRenderer;});document.getElementById("fillBtn").addEventListener("click", () => {featureLayer.renderer = fillRenderer;});});</script>
</head><body><div id="viewDiv"></div><div id="paneDiv" class="esri-widget"><button id="waterBtn">水面效果</button><button id="extrudeBtn">平面拉伸</button><button id="fillBtn">填充效果</button></div>
</body></html>

水面效果

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拉伸效果

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填充效果

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MeshSymbol

mesh符号化一般我们用于对3d object模型数据进行一些颜色样式的渲染：

<html lang="en"><head><meta charset="utf-8" /><meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" /><title>Intro to SceneLayer | Sample | ArcGIS Maps SDK for JavaScript 4.27</title><style>html,body,#viewDiv {padding: 0;margin: 0;height: 100%;width: 100%;}#paneDiv {position: absolute;top: 18px;right: 18px;padding: 12px;background-color: rgba(0, 0, 0, 0.5);color: white;}.esri-attribution{display: none !important;}</style><link rel="stylesheet" href="https://js.arcgis.com/4.27/esri/themes/light/main.css" /><script src="https://js.arcgis.com/4.27/"></script><script>require(["esri/Map", "esri/views/SceneView", "esri/layers/SceneLayer"], (Map,SceneView,SceneLayer) => {// Create Mapconst map = new Map({basemap: "dark-gray-vector",// ground: "world-elevation"});// Create the SceneViewconst view = new SceneView({container: "viewDiv",map: map});// Create SceneLayer and add to the mapconst sceneLayer = new SceneLayer({url:"https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/New_York_LoD2_3D_Buildings/SceneServer",popupEnabled: false});map.add(sceneLayer);view.when(function () {view.extent = sceneLayer.fullExtent;})// Create MeshSymbol3D for symbolizing SceneLayerconst symbol = {type: "mesh-3d", // autocasts as new MeshSymbol3D()symbolLayers: [{type: "fill", // autocasts as new FillSymbol3DLayer()// If the value of material is not assigned, the default color will be greymaterial: {color: [244, 0, 0,0.5],}}]};// Add the renderer to sceneLayerlet renderer = {type: "simple", // autocasts as new SimpleRenderer()symbol: symbol};let isRender = false;document.getElementById("renderBtn").addEventListener("click", function () {if (isRender) {sceneLayer.renderer = null;document.getElementById("renderBtn").innerHTML = "渲染"} else {sceneLayer.renderer = renderer;document.getElementById("renderBtn").innerHTML = "取消渲染"}isRender = !isRender;})});</script>
</head><body><div id="viewDiv"></div><div id="paneDiv"><button id="renderBtn">渲染</button></div>
</body></html>