Line tool

Draw two-point chart annotations without arrowheads. This feature belongs to @revolist/charts and can be used without Pivot or a grid.

Try it live

Choose Line, drag from the first coordinate to the second, then Save. Select the saved line to move it or drag either endpoint. The form supports solid, dashed and dotted lines.

A two-point line can slope. Use a reference line for a constant axis threshold.

Reset example annotations

Loading chart…

Inspect live chart state

The chart uses the native Charts renderer. Buttons outside the plot are example application controls calling the public API.

Complete chart setup with sample data

Install Charts using the installation guide, then run this setup after the host mounts. The data is illustrative. Additional actions for this tool are explained below.

<div id="chart" style="width:100%;height:500px"></div>

import { createChartFactory } from '@revolist/charts/core';
import { lineChart } from '@revolist/charts/line';
import { groupedColumnChart } from '@revolist/charts/grouped-column';
import { columnLineChart } from '@revolist/charts/column-line';

const rows = [
  {
    "date": 1767225600000,
    "month": "Jan",
    "revenue": 65,
    "costs": 45
  },
  {
    "date": 1769904000000,
    "month": "Feb",
    "revenue": 82,
    "costs": 50
  },
  {
    "date": 1772323200000,
    "month": "Mar",
    "revenue": 76,
    "costs": 48
  },
  {
    "date": 1775001600000,
    "month": "Apr",
    "revenue": 95,
    "costs": 65
  },
  {
    "date": 1777593600000,
    "month": "May",
    "revenue": 110,
    "costs": 72
  },
  {
    "date": 1780272000000,
    "month": "Jun",
    "revenue": 102,
    "costs": 68
  },
  {
    "date": 1782864000000,
    "month": "Jul",
    "revenue": 121,
    "costs": 80
  },
  {
    "date": 1785542400000,
    "month": "Aug",
    "revenue": 115,
    "costs": 76
  },
  {
    "date": 1788220800000,
    "month": "Sep",
    "revenue": 135,
    "costs": 89
  },
  {
    "date": 1790812800000,
    "month": "Oct",
    "revenue": 128,
    "costs": 85
  },
  {
    "date": 1793491200000,
    "month": "Nov",
    "revenue": 145,
    "costs": 92
  },
  {
    "date": 1796083200000,
    "month": "Dec",
    "revenue": 155,
    "costs": 100
  }
];
const mapping = {
  "category": {
    "field": "date",
    "label": "month"
  },
  "series": [
    {
      "field": "revenue",
      "label": "Revenue"
    },
    {
      "field": "costs",
      "label": "Costs"
    }
  ]
};
const createChart = createChartFactory([lineChart, groupedColumnChart, columnLineChart]);
const container = document.getElementById('chart')!;
const chart = await createChart({
  container,
  data: rows,
  mapping,
  "chartType": "line",
  "axes": {
    "x": {
      "scale": "time"
    }
  },
  "presentation": {
    "title": "Monthly performance",
    "subtitle": "Illustrative data · 2026",
    "legendPosition": "bottom"
  },
  "interaction": {
    "mode": "select",
    "selectionMode": "multiple"
  },
  "annotations": {
    "editable": true,
    "shapes": [
      {
        "id": "example",
        "color": "#6647f0",
        "kind": "line",
        "from": {
          "x": {
            "scale": "time",
            "value": 1772323200000
          },
          "y": 100
        },
        "to": {
          "x": {
            "scale": "time",
            "value": 1782864000000
          },
          "y": 135
        }
      }
    ]
  }
});

// When the host unmounts:
// chart.destroy();

API and configuration

await chart.update({ annotations: { editable: true, shapes: [{
  id: 'trend-guide', kind: 'line',
  from: { x: { scale: 'time', value: Date.UTC(2026, 2, 1) }, y: 100 },
  to: { x: { scale: 'time', value: Date.UTC(2026, 6, 1) }, y: 135 },
  lineDash: 'dash', color: '#6647f0',
}] } });

Support and behavior

Requires native Cartesian annotation geometry. A drawn line is an authored visual guide; it does not calculate a regression or forecast. Its coordinates persist across zoom, with off-plot portions clipped.

State and cleanup

Authored settings are available through chart.model. Updates replace whole settings objects: spread fields you want to retain, and await the returned promise before reading state or exporting. Destroy the controller when its host unmounts. Committed annotations appear in SVG/PNG/PDF output; CSV remains data-only. Shape IDs must be unique across shapes, references and datum notes. { annotations: {} } clears annotations and editing opt-in.

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