Chalk

A headline written in chalk on a slate board.

isomer.sh/effects/chalk

Knobs

Continue on iPhone
Preset
#F1EEE4
2.40
0.60
0.60
Colour2
1.12
0.94
Shape2
0.90
1.00
Texture3
0.50
0.10
0.12
Still frame

What reduced motion shows: 5.5 s.

Install

Code

components/isomer/chalk.tsx
'use client';
// Generated by isomer. Do not edit by hand; run `isomer add` again to update. (from packages/react/src/Chalk.tsx)
// generated by packages/react/scripts/gen-components.mjs, do not edit
import type { CSSProperties } from 'react';
import { useIsomerCanvas, type Mount, type ImageInput, type ImageSource } from './useIsomerCanvas';
// @ts-ignore: the runtime is plain JS with no type declarations
import * as runtime from './chalk.js';
// @ts-ignore: the baked atlas as a PNG data URL
import atlas from './chalk.image.js';

const { DEFAULTS, mount, loadImage } = runtime as { DEFAULTS: ChalkKnobs; mount: Mount; loadImage: (url: string) => Promise<ImageSource> };

export interface ChalkKnobs {
  accent: string;
  write: number;
  dust: number;
  broken: number;
  grain: number;
  slateTone: number;
  chalkCover: number;
  chalkWidth: number;
  shake: number;
  ghosts: number;
  chalkHaze: number;
}

export interface ChalkProps extends Partial<ChalkKnobs> {
  className?: string;
  style?: CSSProperties;
  /** Render this one frame (seconds) and run no clock. Used by the parity tests. */
  time?: number;
  paused?: boolean;
  /** The clock stops at t = 5.5 and holds that frame. Draw t = 5.5 once when the user prefers reduced motion. Default true. */
  respectReducedMotion?: boolean;
  /** Keep each frame readable after it is shown, for canvas.toDataURL or readPixels. Read at mount. Default false. */
  preserveDrawingBuffer?: boolean;
  /** The image the shader reads. Default: the baked glyph atlas of "Today: cardamom buns". */
  image?: ImageInput;
}

export const chalkDefaults: Readonly<ChalkKnobs> = DEFAULTS;

export function Chalk({ className, style, time, paused, respectReducedMotion, preserveDrawingBuffer, image, ...props }: ChalkProps) {
  const knobs = { ...DEFAULTS };
  for (const k of Object.keys(DEFAULTS) as (keyof ChalkKnobs)[]) {
    const v = props[k];
    if (v !== undefined) (knobs as Record<string, unknown>)[k] = v;
  }
  const ref = useIsomerCanvas({ mount, knobs, time, paused, respectReducedMotion, preserveDrawingBuffer, posterTime: 5.5, settleAt: 5.5, image: image ?? atlas, loadImage });
  return <canvas ref={ref} className={className} style={{ display: 'block', width: '100%', height: '100%', ...style }} />;
}

Parity

iPhone 17 Pro simulator, iOS 26.3.1 against Chromium headless + SwiftShader, 15 October 2026.