Clyune Component GalleryPixel Sorting · How it works & code
Scanning the image row by row, reordering consecutive pixels with brightness above the threshold from dark to bright creates a 'stretching' effect.
Runtime logic
Visiting `/generative/pixelsort`, DemoHost lazy-loads `demos/kits/kit-generative.js` (registry `mod: 'kit-generative'`) and calls `mount(host, { variant: 'pixelsort' })`. mount resolves the variant to family `pixelsort`; `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°); clamp — Clamps a value to a range; TAU — Constant 2π; 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.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.fillRect() — Fills a rectangle; ctx.arc() — Adds a circular arc (center, radius, start/end angle); ctx.drawImage() — Draws an image or offscreen canvas; ctx.save() — Saves the drawing state (transform, styles, clip); ctx.rect() — Adds a rectangle to the path; ctx.clip() — Turns the current path into the clipping region; ctx.restore() — Restores the saved drawing state
Source code
frontend/src/demos/kits/kit-generative.js: FAM.pixelsort (L463-L474)
Code walkthrough
L463-474: Calls the factory `gFam()` to produce the full definition (spec + doc + build) from the options below. L463-463: Title shown in the info and control panels: “Pixel sorting”. L463-463: Range/default of the size slider: Pixel block. L463-463: Range/default of the count slider: Max segment length. L464-464: Extra demo-specific slider/toggle: Brightness threshold. L464-464: Default main colour. L464-464: Help text of the size parameter. L464-464: Help text of the count parameter. L464-464: Help text of the extra parameter. L464-464: Preset buttons: name → parameter overrides (5). L465-465: Body of the “Notes” section. L465-465: Main formula of the “Formula” section. L465-465: Second formula line. L466-474: Per-frame draw function: math via `Math.floor`, `Math.abs`, `Math.round`; returns readouts `cell` to the info panel.
Principles
Section = pixels that continuously meet the brightness > threshold Sort in brightness order (long) ≤) pixel sorting (Glitch art): a line-by-line scan of a picture that rearranges a continuous section of a pixel with a brightness above the threshold from the dark to the brightness will have the effect of being "Razed." The source map is the noise colour of the flow; the lines in which the pointer is located are of unlimited length, with the longest radish. Generative Art = a simple mathematical rule + Random number/噪声，让电脑自己「画」出图案；改变参数就是改变规则。