Contour Field

Topographic lines that shift slowly behind a section and part around the pointer.

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Category
Creative
Access
Pro
Source
284 lines · one file
States
4 drawn

The decision inside it

The lines are computed, not drawn from an image

The field is traced at even levels every frame, so lines never cross or break and stay sharp at any size. It is a background first: capped at 30 frames a second, only on screen, low contrast behind text, and a still map for reduced motion.

When to use it

Use Contour Field as a calm, technical backdrop: live topographic lines that drift and rise under the pointer. Put your heading inside it.

Installation

How you get it

Paste this into Claude Code, Cursor, Codex or any coding agent. It installs the file and uses it as it is, instead of writing a new one.

Use Liro's Contour Field for this.
Install it: npx shadcn@latest add @liro/contour-field
(the @liro registry is set up in components.json, with LIRO_KEY in .env.local)
Import it from @/components/ui/contour-field.
Do not rewrite or restyle it. Pass my data through its props
and keep its built-in states.

For the full brief with every prop and the mistakes assistants usually make, use Copy prompt above. Pro components install through the @liro registry with your CLI token: see the Namespaced tab.

Usage

components/hero.tsx
import { ContourField } from "@/components/ui/contour-field";

export function Hero() {
  return (
    <ContourField className="h-[520px] text-neutral-950 dark:text-white">
      <div className="flex h-full items-center justify-center">
        <h1 className="text-5xl font-bold tracking-tight">Map the terrain before you build.</h1>
      </div>
    </ContourField>
  );
}

API reference

“Copy prompt” above puts a full brief on your clipboard, install command, dependencies, props, and the mistakes an assistant usually makes with this component.

Props

Read from the component’s own TypeScript interface when the site is built, so this table cannot drift from the file you install.

TypeNotes
levelsnumber NoNumber of contour levels. Default 14.
scalenumber NoSize of the field's features; larger is broader hills. Default 1.
speednumber NoHow fast the field drifts. 0 for still. Default 1.
interactiveboolean NoRaise the field under the pointer. Default true.
fadeboolean NoFade toward the edges. Default true.

Dependencies

npm packages

clsxtailwind-merge

Liro foundations, installed alongside it

liro-theme

States

All of them are drawn by the component. None is left for you to design.

  • Drifting
  • Pointer rise
  • Still
  • Reduced motion

Accessibility

  • Keyboard reachable throughout, in visual order
  • Focus trapped in overlays, Escape closes them
  • Focus returns to whatever opened it
  • Live regions announce what changed, not that something did
  • Honours prefers-reduced-motion

Responsive behavior

  • Sizes to its container, not the viewport
  • Usable from 320px up
  • Pointer-based interaction, so trackpad and touch both work
  • No hover-only affordances