Clyune Component GalleryNeon Combo · How it works & code
Neon effect is built from multiple layers of filters — the outermost layer is a broad, semi-transparent colored glow (blurred drop-shadow), followed by...
Runtime logic
Visiting `/filters/neon-combo`, DemoHost lazy-loads `demos/kits/kit-filters.js` (registry `mod: 'kit-filters'`) and calls `mount(host, { variant: 'neon-combo' })`. mount resolves the variant to family `neon-combo`; `withControls` builds the control panel (6 presets + sliders). `createCanvasStage` creates the `<canvas>` (HiDPI ≤ 2×, ResizeObserver) and the info panel. The family’s `build(S)` initialises state and returns the per-frame callback. Every `requestAnimationFrame`: read controls, advance a speed-scaled clock (dt ≤ 50 ms), run the frame callback; returned readouts go to the info panel. Changing parameters: colour/speed/size apply live; structural ones remount; leaving the page cancels rAF, removes listeners and frees resources.
Environment
Canvas 2D: 2D canvas drawing; requestAnimationFrame: Display-synced animation loop; ResizeObserver: Canvas follows container size; Pointer Events: Unified mouse/touch/pen events; devicePixelRatio: Crisp HiDPI rendering (capped at 2×) · react 18.3.1, react-router-dom 6.30.6, vite 5.4.21
Dependencies
react 18.3.1
Imported APIs
withControls — Wraps the demo in the shared control panel (presets, sliders, reset); hot-updates or remounts on change; paramsFromSpec — Turns the spec (colour/speed/size/count/extras) into control-panel parameter definitions; createCanvasStage — Shared Canvas 2D stage: canvas + info panel, HiDPI, one rAF loop, pointer state, idle auto-pointer; hueOf — Hue of a colour (0–360°); fmt — Number formatting (fixed decimals); F — Formula block HTML; S.clear — Clears with the background colour (translucent = trails); S.onFrame — Registers a per-frame callback; its return value feeds the info panel; ctx.fillRect() — Fills a rectangle; ctx.save() — Saves the drawing state (transform, styles, clip); ctx.fillText() — Draws filled text; ctx.restore() — Restores the saved drawing state; ctx.beginPath() — Starts a new path; ctx.moveTo() — Moves the pen without drawing; ctx.arcTo() — Adds an arc using tangent lines; ctx.closePath() — Closes the current sub-path; ctx.fill() — Fills the current path; ctx.stroke() — Strokes the current path; ctx.rect() — Adds a rectangle to the path; ctx.clip() — Turns the current path into the clipping region; ctx.translate() — Translates the coordinate system
Source code
frontend/src/demos/kits/kit-filters.js: FAM.neon-combo (L275-L291)
Code walkthrough
L275-291: Calls the factory `fFam()` to produce the full definition (spec + doc + build) from the options below. L275-275: Title shown in the info and control panels: “Neon Combo”. L275-275: Range/default of the count slider. L275-275: Extra demo-specific slider/toggle: Emission intensity. L275-275: Range/default of the size slider. L275-275: Default main colour. L275-275: Hide sample photo. L276-276: Help text of the count parameter. L276-276: Help text of the extra parameter. L276-276: Help text of the size parameter. L277-277: Preset buttons: name → parameter overrides (5). L278-278: Body of the “Notes” section. L279-279: Main formula of the “Formula” section. L279-279: Second formula line. L280-291: Per-frame draw function: draws with Canvas 2D `fillRect`, `save`, `fillText`, `restore`; math via `Math.min`, `Math.max`, `Math.sin`, `Math.pow`, `Math.abs`, `Math.round`; returns readouts `mode`, `cell` to the info panel.
Principles
Optical zone i: drop-shadow (0) (4) · 3ⁱ · Intensity) px colour), i = 0, 1, 2 Lantern colour = white mixed with main colour Combining neon: The effect of neon lights is that several layers of filters are folded -- the outermost is wide, Trans FIFT pulled colour lumber (drop-shadow in Superior) with smaller lum Subsequently close to the accept Each of the white lamps in Foreign Affairs. Traditionally, it's like exposure to bad neon lights.