Clyune Component GalleryMosaic Noise · How it works & code
Divide the image into square tiles, take the noise value at the center of each tile, and quantize it into several color levels based on the 'gradient levels' setting.
Runtime logic
Visiting `/generative/mosaic`, DemoHost lazy-loads `demos/kits/kit-generative.js` (registry `mod: 'kit-generative'`) and calls `mount(host, { variant: 'mosaic' })`. mount resolves the variant to family `mosaic`; `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.fill() — Fills the current path; 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.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.mosaic (L361-L373)
Code walkthrough
L361-373: Calls the factory `gFam()` to produce the full definition (spec + doc + build) from the options below. L361-361: Title shown in the info and control panels: “Noise Mosaic”. L361-361: Range/default of the size slider: Tile Size. L361-361: Range/default of the count slider: Grading count. L362-362: Extra demo-specific slider/toggle: Gaps. L362-362: Default main colour. L362-362: Help text of the count parameter. L362-362: Preset buttons: name → parameter overrides (5). L363-363: Body of the “Notes” section. L363-363: Main formula of the “Formula” section. L363-363: Second formula line. L364-373: Per-frame draw function: draws with Canvas 2D `fill`; math via `Math.floor`, `Math.hypot`, `Math.max`, `Math.min`; returns readouts `cell` to the info panel.
Principles
v = noise · 0.01, 0.2t) Scale = floor(v) · Color = main colour + grade) · 25° Marseille: Cut the image into square bricks, take the noise value of each brick from the centre, and rounded to the "chromatic steps" in a few colours (quantitative). The noise flows over time, so the colours change like the tide; the bricks around the pointer rise and shine. 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。