Angular OHLC Chart with Trend Line

/* app.component.ts */
import { Component, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterOutlet } from '@angular/router';
import { HttpClientModule, HttpClient } from '@angular/common/http';
 
import { CanvasJSAngularChartsModule } from '@canvasjs/angular-charts';
 
@Component({
  selector: 'app-root',
  standalone: true,
  imports: [CommonModule, RouterOutlet, HttpClientModule, CanvasJSAngularChartsModule],
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
 
export class AppComponent implements OnInit {
  constructor(private http : HttpClient) {  
  }

  chart:any;
  dps1: any[] = [];
  loading:boolean = true;
  
  ngOnInit() {
    // perform http request to get the json for dataPoints
    this.http.get('https://canvasjs.com/data/docs/btcusd2018.json', { responseType: 'json' }).subscribe((response: any) => {
      let data = response;
      for(let i = 0; i < data.length; i++){
        this.dps1.push({x: new Date(data[i].date), y: [Number(data[i].open), Number(data[i].high), Number(data[i].low), Number(data[i].close)]});
      }
      this.loading = false;
    });
  
  }
 
  chartOptions = {
    theme: "light2",
    zoomEnabled: true,
    title:{
      text:"Bitcoin Price"
    },
    axisY: {
      title: "Price in USD",
      prefix: "$"
    },
    axisX: {
      valueFormatString: "MMM",
    },
    legend: {
      verticalAlign: "bottom",
      cursor: "pointer",
      itemclick: function (e:any) {
        if (typeof (e.dataSeries.visible) === "undefined" || e.dataSeries.visible) {
          e.dataSeries.visible = false;
        } else {
          e.dataSeries.visible = true;
        }
        e.chart.render();
      }
    },
    toolTip: {
      shared: true
    },
    data: [{
      type: "ohlc",
      showInLegend: true,
      name: "Bitcoin Price",
      yValueFormatString: "$#,###.00",
      xValueType: "dateTime",
      dataPoints: this.dps1
    }]
  }
 
  getChartInstance(chart: object) {
		this.chart = chart;
    this.calculateTrendLine(this.chart);
  }
 
  /*
    References:
      https://math.stackexchange.com/a/204021
      https://classroom.synonym.com/calculate-trendline-2709.html
  */
  calculateTrendLine(chart: any){
    let a, b, c, d, e, slope, yIntercept;
    let xSum = 0, ySum = 0, xySum = 0, xSquare = 0, dpsLength = chart.data[0].dataPoints.length;
    for(let i = 0; i < dpsLength; i++) 	
      xySum += (chart.data[0].dataPoints[i].x.getTime() * chart.data[0].dataPoints[i].y[3])
    a = xySum * dpsLength;
 
    for(let i = 0; i < dpsLength; i++){  	
      xSum += chart.data[0].dataPoints[i].x.getTime();
      ySum += chart.data[0].dataPoints[i].y[3];
    }
    b = xSum * ySum;
 
    for(let i = 0; i < dpsLength; i++)  	
      xSquare += Math.pow(chart.data[0].dataPoints[i].x.getTime(), 2);    
    c = dpsLength * xSquare;
 
    d = Math.pow(xSum, 2);
    slope = (a-b)/(c-d);  
    e = slope * xSum;
    yIntercept = (ySum - e) / dpsLength;
 
    let startPoint = this.getTrendLinePoint(chart.data[0].dataPoints[0].x, slope, yIntercept);
    let endPoint = this.getTrendLinePoint(chart.data[0].dataPoints[dpsLength-1].x, slope, yIntercept);
 
    chart.addTo("data",{
      type: "line", //Line series showing trend
      markerSize: 0,
      name: "Trend",
      showInLegend: true,
      color: "#E64A19",
      yValueFormatString: "$#,###.00",
      dataPoints: [startPoint, endPoint]
    });
  }
 
  getTrendLinePoint(x: any, slope: any, intercept: any){
    return {x: x, y: ((slope * x) + intercept)};
  }
}