Range Bar and Range Area

Range series: instead of yField, a yLowField / yHighField pair.

Range Area

config.ts

import { getData } from './data';
import type { ChartOptions } from 'grafit-charts';

export function createOptions(): ChartOptions {
  return {
    data: getData(),
    title: { text: 'Temperature range' },
    series: [{ type: 'range-area', xField: 'month', yLowField: 'min', yHighField: 'max', name: 'Min–Max, °C' }],
    legend: { enabled: false },
  };
}

data.ts

export function getData() {
  return [
    { month: 'Jan', min: -12, max: -2 },
    { month: 'Feb', min: -10, max: 0 },
    { month: 'Mar', min: -4, max: 6 },
    { month: 'Apr', min: 2, max: 14 },
    { month: 'May', min: 8, max: 21 },
    { month: 'Jun', min: 13, max: 26 },
    { month: 'Jul', min: 15, max: 29 },
    { month: 'Aug', min: 13, max: 27 },
    { month: 'Sep', min: 8, max: 20 },
    { month: 'Oct', min: 2, max: 11 },
    { month: 'Nov', min: -4, max: 4 },
    { month: 'Dec', min: -9, max: -1 },
  ];
}

Range Bar

config.ts

import { getData } from './data';
import type { ChartOptions } from 'grafit-charts';

export function createOptions(): ChartOptions {
  return {
    data: getData(),
    title: { text: 'Salary ranges' },
    subtitle: { text: 'thousand ₽ per month' },
    series: [{ type: 'range-bar', xField: 'role', yLowField: 'from', yHighField: 'to', name: 'Range' }],
    legend: { enabled: false },
  };
}

data.ts

export function getData() {
  return [
    { role: 'Junior', from: 80, to: 150 },
    { role: 'Middle', from: 160, to: 260 },
    { role: 'Senior', from: 250, to: 400 },
    { role: 'Lead', from: 320, to: 480 },
  ];
}

Horizontal range bars

direction: 'horizontal' flips the chart: categories move to the vertical axis.

config.ts

import { getData } from './data';
import type { ChartOptions } from 'grafit-charts';

export function createOptions(): ChartOptions {
  return {
    data: getData(),
    title: { text: 'Salary ranges' },
    subtitle: { text: 'thousand ₽ per month' },
    series: [
      {
        type: 'range-bar',
        xField: 'role',
        yLowField: 'from',
        yHighField: 'to',
        name: 'Range',
        direction: 'horizontal',
      },
    ],
    legend: { enabled: false },
  };
}

data.ts

export function getData() {
  return [
    { role: 'Junior', from: 80, to: 150 },
    { role: 'Middle', from: 160, to: 260 },
    { role: 'Senior', from: 250, to: 400 },
    { role: 'Lead', from: 320, to: 480 },
  ];
}

Per-bar colour (Gantt)

fill accepts a callback ({ low, high, datum, index }) => color — colour each bar individually, e.g. a Gantt timeline painted by task status from a single series:

config.ts

import { getData } from './data';
import type { ChartOptions } from 'grafit-charts';

// Colour each task bar by its status — a Gantt-style timeline from a single range-bar series.
const STATUS_COLORS: Record<string, string> = {
  done: '#22c55e',
  running: '#3b82f6',
  failed: '#ef4444',
  queued: '#94a3b8',
};

export function createOptions(): ChartOptions {
  return {
    data: getData(),
    title: { text: 'Pipeline run' },
    subtitle: { text: 'task timeline, hours' },
    series: [
      {
        type: 'range-bar',
        xField: 'task',
        yLowField: 'start',
        yHighField: 'end',
        direction: 'horizontal',
        cornerRadius: 3,
        fill: ({ datum }) => STATUS_COLORS[String(datum.status)] ?? '#94a3b8',
      },
    ],
    legend: { enabled: false },
  };
}

data.ts

export function getData() {
  return [
    { task: 'extract', start: 0, end: 3, status: 'done' },
    { task: 'validate', start: 3, end: 5, status: 'done' },
    { task: 'transform', start: 5, end: 11, status: 'running' },
    { task: 'notify', start: 8, end: 10, status: 'failed' },
    { task: 'load', start: 11, end: 14, status: 'queued' },
    { task: 'report', start: 14, end: 16, status: 'queued' },
  ];
}

Range labels

label.formatter({ low, high, datum }); placements are the same as for bar — here center inside the bar with auto contrast:

config.ts

import { getData } from './data';
import type { ChartOptions } from 'grafit-charts';

export function createOptions(): ChartOptions {
  return {
    data: getData(),
    title: { text: 'Ranges with labels' },
    series: [
      {
        type: 'range-bar',
        xField: 'city',
        yLowField: 'min',
        yHighField: 'max',
        name: 'Temperature, °C',
        label: {
          enabled: true,
          placement: 'center',
          formatter: ({ low, high }) => `${low}…${high}`,
        },
      },
    ],
    legend: { enabled: false },
  };
}

data.ts

export function getData() {
  return [
    { city: 'Moscow', min: -8, max: 2 },
    { city: 'Sochi', min: 4, max: 12 },
    { city: 'Novosibirsk', min: -16, max: -6 },
    { city: 'Kazan', min: -10, max: 0 },
    { city: 'Vladivostok', min: -7, max: 1 },
  ];
}

Combining with a mean line

Range-area as the background + line on top, with a shared tooltip:

config.ts

import { getData } from './data';
import type { ChartOptions } from 'grafit-charts';

export function createOptions(): ChartOptions {
  return {
    data: getData(),
    title: { text: 'Range + average line' },
    series: [
      {
        type: 'range-area',
        xField: 'month',
        yLowField: 'min',
        yHighField: 'max',
        name: 'Range, °C',
        fillOpacity: 0.25,
      },
      { type: 'line', xField: 'month', yField: 'avg', name: 'Average', strokeWidth: 2.5 },
    ],
    tooltip: { mode: 'shared', range: 'nearest' },
  };
}

data.ts

export function getData() {
  const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
  return months.map((month, i) => {
    const mid = 8 + 14 * Math.sin(((i - 3) / 12) * Math.PI * 2);
    return {
      month,
      min: Math.round(mid - 5 - (i % 3)),
      max: Math.round(mid + 6 + ((i + 1) % 3)),
      avg: Math.round(mid),
    };
  });
}

Option	Type	Description
yLowField	string	range bounds
yHighField	string	range bounds
direction (bar)	'vertical' | 'horizontal'	bar direction (vertical)
fill	ColorValue | (params) => ColorValue	fill; callback colours per datum
fill	styles	fill
fillOpacity	styles	fill
stroke (area)	styles	outline lines
strokeWidth (area)	styles	outline lines
cornerRadius (bar)	Pixels	corner rounding

Full list of options

Option	Type	Default	Description
label.enabled	boolean	false	show value labels
label.placement	outer/center/inner-* (17 placements)	'top'	label placement
label.formatter	({ low, high, datum }) => string	value	label content
label.fontSize	Pixels	11	label font size
label.fontWeight	string | number	normal	font weight
label.fontFamily	string	theme font	font family
label.color	ColorValue	foreground; inside — auto contrast	text color

Options

Options common to all series (name, showInLegend, tooltip.renderer, …) are covered in Common series options.