angular - d3v4 + Typescript + angular2 错误使用 d3.line().x((d) => {function})

Question

所以我有这个...

import { D3Service, D3, Selection } from 'd3-ng2-service';

interface ChartData {
    q: number,
    p: number
} 

export class GraphComponent implements OnInit{
   private d3;
   private x1;
   private y;

    constructor(element: ElementRef, d3Service: D3Service) { 
        this.d3 = d3Service.getD3(); 
        let d3 = this.d3;


    this.y = d3.scaleLinear()
    .domain([0,100])
    .range([330, 20])
    ;
    this.x1 = d3.scaleLinear()
    .range([0, 100])
    ;
}

   render() {
      let y = this.y;
      let x1 = this.x1;
      let data = [{p:1,q:1}, {p:0.5,q:2}]

       var line = d3.line()
          .x((d: ChartData) => {return x1(d.q);})
          .y((d: ChartData) => {return y(d.p);});

        svg.append("path")
          .data(data)
          .attr("class", "line")
          .attr("d", line);
   }
}

我在 .x(d: ChartData) 行上收到一条错误消息:

Argument of type '(d: ChartData) => any' is not assignable toparameter of type '(d: [number, number], index: number, data: [number,number][]) => number'. Types of parameters 'd' and 'd' areincompatible.Type '[number, number]' is not assignable to type 'ChartData'.Property 'q' is missing in type '[number, number]'.

然后我查看了 d3 的文档，其中说我需要通过 line(data) 将我的数据注入(inject) line() 以获得自定义数据。

var line = d3.line(data)
    .x((d: ChartData) => {return x1(d.q);})
    .y((d: ChartData) => {return y(d.p);});

然后导致这个错误...

ERROR in [default]file.ts:259:13Supplied parameters do not match any signature of call target.

...尽管 d3 文档说我应该能够这样做。那我做错了什么？

Answer 1

你的第一个语法(没有传递data)是正确的。我认为您只需告诉 TypeScript 您要传递给 d3.line 的内容，例如:

var line = d3.line<ChartData>()
  .x((d: ChartData) => {return x1(d.q);})
  .y((d: ChartData) => {return y(d.p);});

它正在尝试使用默认值进行编译:

d3.line<[number, number]>