craftbits*

Hero Init Stability

A large illustrative hero SVG for initialisation stability — eight signal bars stack from L1 (bottom) to L8 (top). The bad-init phase shows the signal shrinking and shifting to a warning tint as it climbs the stack; the good-init phase fills every layer with success-tinted bars and reveals a cosine-LR curve alongside.

Customize
Hero illustration
400px
accent

Installation

npx shadcn@latest add https://craftbits.dev/r/hero-init-stability.json

Usage

import { HeroInitStability } from "@craft-bits/core/svg/hero-init-stability";
 
<HeroInitStability size={400} />
 
// Tint via the parent text color.
<div className="text-cb-accent">
  <HeroInitStability />
</div>

Understanding the component

  1. One inline SVG, looping storyboard. A single <svg viewBox="0 0 400 280"> paints every frame. One useEffect schedules the full ~9s cycle: bars appear bottom → top, bad-init fills ramp + "vanishing" label fades in, bars reset, good-init fills ramp + "He init" label and cosine-LR curve fade in, bars shrink, loop. Every timer is cleaned up on unmount.
  2. Motion values, not re-renders. Per-bar widths, outline opacities, the bad → good phase opacity, the warm / cool atmospheric glows, and the cosine-LR pathLength are all driven by useMotionValue + useSpring — the React tree never re-renders during the cycle. Springs come from @craft-bits/core/motion (SPRINGS.bouncy for bar widths, SPRINGS.snap for the phase switch, SPRINGS.smooth for outlines / labels / glows). SVG widths are clamped to non-negative to absorb spring overshoot through zero.
  3. Theme-driven color. Outlines, layer labels, axes, and the caption flow from currentColor, so the host tints the whole illustration with any text-cb-* utility. The good-phase bars and "He init" label stay locked to var(--cb-success); the upper bad-phase bars and "vanishing" label stay locked to var(--cb-warning). The accentColor prop colors the healthy lower bars and the cosine-LR curve — accepting any CSS color (including var(--cb-accent)).
  4. Reduced-motion safe. When prefers-reduced-motion: reduce is set, the loop short-circuits to a static "He init" frame: bars at their healthy widths, success label and cosine-LR curve visible.

Variants / Examples

// Compact thumbnail.
<HeroInitStability size={240} />
 
// Explicit accent color.
<HeroInitStability size={480} accentColor="var(--cb-warning)" />
 
// Custom hex.
<HeroInitStability accentColor="#f97316" />

Props

PropTypeDefaultDescription
sizenumber400Pixel width. Height is computed from the 400×280 aspect ratio.
accentColorstring'currentColor'Any CSS color. Tints the healthy lower bars and the cosine-LR curve.
classNamestring—Extra classes merged onto the root <svg>.
...restSVGAttributes<SVGSVGElement>—Other SVG props forwarded to the root.

Accessibility

  • The root <svg> carries aria-hidden="true" — the illustration is decorative; pair it with a visible heading or caption in its surrounding context.
  • Motion respects prefers-reduced-motion: reduce: the loop short-circuits and renders a static "He init" frame instead of looping.
  • All colors flow from currentColor and theme variables, so contrast tracks the consumer's text and accent tokens — no hardcoded hex values.

Credits

  • Extracted from: craftingattention (app/src/lessons/primitives/chrome/icons/heroes/HeroInitStability.tsx).
  • Inspiration: the canonical "make the gradients survive ten layers" diagram — eight stacked signal bars contrasting vanishing gradients with He-initialised stability, alongside a cosine-LR schedule.