arcgis js 4 使用d3.js 添加滤镜光

我们利用d3滤镜为d3元素增加光的效果

我们存一些全局变量

• this.animateOption = null;
• this.defs = null;
• this.animateId = "";
• this.feDropShadow = null;

滤镜初始化

• function create(option){
• this.animateOption = option;
• this.defs = this.svg.append("defs");
• let linearGradient = this.defs.append("filter")
• .attr("id",this.animateOption.id)
• .attr("x","-50%")
• .attr("y","-50%")
• .attr("width","200%")
• .attr("height","200%")
•  
• this.feDropShadow = linearGradient.append("feDropShadow")
• .attr("dx", "0")
• .attr("dy","0")
• .attr("stdDeviation","0")
• .attr("flood-color",this.animateOption.floodColor)
• }

启动滤镜
```javascript
function start(){
let multiplier = this.animateOption.speed;
let xDiff= 0.01;
let yDiff= 0.01;
let that = this;
function setBlur(x,y){
that.feDropShadow.attr("stdDeviation",x);
}
let flag = true;

• (function updateMotionBlur(){

 更多参考 https://xiaozhuanlan.com/topic/8193652740