arcgis 与gl-matrix 做电缆可视化
在arcgis中线的样式实在太难修改了，要是想做特效的线必须要借助webgl效果来弄
在官网gl-matrix 的线效果有特例
https://developers.arcgis.com/javascript/latest/sample-code/custom-gl-animated-lines/
今天和大家分享下电缆线的可视化
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>电缆可视化</title>
<script src="https://cdn.bootcdn.net/ajax/libs/gl-matrix/2.8.1/gl-matrix-min.js"></script>
<link rel="stylesheet" href="https://js.arcgis.com/4.19/esri/themes/light/main.css" />
<script src="https://js.arcgis.com/4.19/"></script>
<style type="text/css" media="screen">
html,
body,
#viewDiv {
width: 100%;
height: 100%;
padding: 0;
margin: 0;
}
</style>
<script>
require([
"esri/WebMap",
"esri/Map",
"esri/core/watchUtils",
"esri/core/promiseUtils",
"esri/layers/GraphicsLayer",
"esri/layers/FeatureLayer",
"esri/views/MapView",
"esri/views/2d/layers/BaseLayerViewGL2D"
], function(
WebMap,
Map,
watchUtils,
promiseUtils,
GraphicsLayer,
FeatureLayer,
MapView,
BaseLayerViewGL2D
) {
var CustomLayerView2D = BaseLayerViewGL2D.createSubclass({
aPosition: 0,
aOffset: 1,
aTexcoord: 2,
aDistance: 3,
aSeeds: 4,
aLength: 5,
constructor: function() {
this.transform = mat3.create();
this.rotation = mat3.create();
this.display = mat3.create();
this.screenTranslation = vec2.create();
this.translationToCenter = vec2.create();
this.needsUpdate = false;
var requestUpdate = function() {
this.promises = [];
this.layer.graphics.forEach(this.processGraphic.bind(this));
promiseUtils.all(this.promises).then(
function(meshes) {
this.meshes = meshes;
this.needsUpdate = true;
this.requestRender();
}.bind(this)
);
}.bind(this);
this.watcher = watchUtils.on(
this,
"layer.graphics",
"change",
requestUpdate,
requestUpdate,
requestUpdate
);
},
更多信息参考小专栏https://xiaozhuanlan.com/topic/0845263791
