Euler Coin

A brushed metal coin drops onto the screen, lands on its rim and settles the way a real coin does, wobbling faster and faster as it tips flat, then lies still with a soft click.

isomer.sh/effects/eulercoin

Knobs

Continue on iPhone
Preset
#E3B467
128
2.40
0.62
Light3
0.80
0
0.12
Shape3
0.00
0.11
0.80
Motion1
1.50
Texture1
0.85
Still frame

What reduced motion shows: 2 s.

Install

Code

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

const { DEFAULTS, mount } = runtime as { DEFAULTS: EulercoinKnobs; mount: Mount };

export interface EulercoinKnobs {
  metalColor: string;
  diameter: number;
  settle: number;
  wobble: number;
  gloss: number;
  mark: number;
  keyAngle: number;
  fillLight: number;
  thickness: number;
  fieldRadius: number;
  dropHeight: number;
  frost: number;
}

export interface EulercoinProps extends Partial<EulercoinKnobs> {
  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 = 5.7 and holds that frame. Draw t = 5.7 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;
}

export const eulercoinDefaults: Readonly<EulercoinKnobs> = DEFAULTS;

export function Eulercoin({ className, style, time, paused, respectReducedMotion, preserveDrawingBuffer, ...props }: EulercoinProps) {
  const knobs = { ...DEFAULTS };
  for (const k of Object.keys(DEFAULTS) as (keyof EulercoinKnobs)[]) {
    const v = props[k];
    if (v !== undefined) (knobs as Record<string, unknown>)[k] = v;
  }
  const ref = useIsomerCanvas({ mount, knobs, time, paused, respectReducedMotion, preserveDrawingBuffer, posterTime: 5.7, settleAt: 5.7 });
  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.