demo D279

A trend line and a forecast in Angular

Draw a least-squares trend straight through the points and carry it on as a dashed forecast, with a vertical event marker flagging the day a change went live

trend: { method: 'linear', forecast: 8 }

This draws a least-squares trend straight through the points and carries it on as a dashed forecast, with a vertical marker flagging the day a change went live. It shows where a series is heading and lets you see whether an event bent the line.

Building…

Loading a live grid…

This is the Angular version. A standalone component takes the whole configuration through one config input, surfaces grid events as outputs, and exposes the live grid on a getter for anything the inputs do not cover.

The configuration

import { Component, ViewChild, AfterViewInit } from '@angular/core';
import { bootstrapApplication } from '@angular/platform-browser';
import { createGrid } from '@toclocoinc/lattice-grid';
import '@toclocoinc/lattice-grid/css';
import { createChart } from '@toclocoinc/lattice-grid/modules/charts';
import { LatticeGridComponent, provideLattice } from '@toclocoinc/lattice-grid/angular';

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [LatticeGridComponent],
  template:
    '<div id="chart" style="height:300px"></div>' +
    '<lattice-grid [config]="grid" style="display:block;height:320px;margin-top:14px"></lattice-grid>',
})
export class AppComponent implements AfterViewInit {
  @ViewChild(LatticeGridComponent) gridRef!: LatticeGridComponent;

  grid = {
    rowKey: 'id',
    columns: [
      { field: 'day', title: 'Day', type: 'number' },
      { field: 'active', title: 'Active users', type: 'number', total: 'mean' },
    ],
    rows: [/* one clean, sorted point per day: day, active */],
  };

  ngAfterViewInit() {
    createChart({
      grid: this.gridRef.grid, container: '#chart', type: 'line', x: 'day', y: 'active', legend: true,
      trend: { method: 'linear', forecast: 8 },
      title: 'The trend, projected ahead',
    });
  }
}

bootstrapApplication(AppComponent, {
  providers: [provideLattice({ createGrid })],
});