Clyune Component GalleryPress Ripple · How it works & code
When clicking the button, draw a circle from the click position. The circle rapidly expands, fades in color, and is clipped within the button's rounded rectangle.
Runtime logic
Visiting `/micro/press-ripple`, DemoHost lazy-loads `demos/kits/kit-micro.js` (registry `mod: 'kit-micro'`) and calls `mount(host, { variant: 'press-ripple' })`. mount resolves the variant to family `press-ripple`; `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. Pointer down/drag/move updates the interaction (drag handles, hover readouts); when untouched and auto-demo is on, the pointer follows a Lissajous path. 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.onDown — Pointer down; S.onUp — Pointer up; S.clear — Clears with the background colour (translucent = trails); S.isAutoDemo — Whether auto demo is on; S.onFrame — Registers a per-frame callback; its return value feeds the info panel; ctx.save() — Saves the drawing state (transform, styles, clip); ctx.translate() — Translates the coordinate system; ctx.fill() — Fills the current path; ctx.clip() — Turns the current path into the clipping region; ctx.beginPath() — Starts a new path; ctx.arc() — Adds a circular arc (center, radius, start/end angle); ctx.restore() — Restores the saved drawing state; ctx.fillText() — Draws filled text; ctx.moveTo() — Moves the pen without drawing; ctx.arcTo() — Adds an arc using tangent lines; ctx.closePath() — Closes the current sub-path
Source code
frontend/src/demos/kits/kit-micro.js: FAM.press-ripple (L501-L515)
Code walkthrough
L501-515: Calls the factory `mFam()` to produce the full definition (spec + doc + build) from the options below. L501-501: Title shown in the info and control panels: “Press Ripple”. L501-501: Range/default of the count slider. L501-501: Extra demo-specific slider/toggle: Diffusion Radius. L501-501: Range/default of the size slider. L501-501: Default main colour. L501-501: Animation period (s). L502-502: Help text of the count parameter. L502-502: Help text of the extra parameter. L502-502: Help text of the size parameter. L503-503: Preset buttons: name → parameter overrides (5). L504-504: Body of the “Notes” section. L505-505: Main formula of the “Formula” section. L505-505: Second formula line. L506-515: Per-frame draw function: draws with Canvas 2D `save`, `translate`, `fill`, `clip`, `beginPath`, `arc` …; math via `Math.min`, `Math.round`; returns readouts `mode`, `cell` to the info panel.
Principles
Radius = diffusion radius · Button width · S Facilities Extraordinary Drawing Enhancement Transparency = 0.4 · (1 - e), e = progress after the start of the millium Press the Ripple: When you click the button, draw a circle from where you click, and the radius of the circle becomes very large, Colours fade and are cut inside the rounded rectangle of buttons. Repeated clicks are stacked with multiple thalliums, and the button itself is slightly sunk when pressed. There's no real use here DOM 控件：每个微交互都在画布上逐帧画出来。动画按固定周期自动循环播放，并用一个「演示指针」模拟用户的点击、按住或拖动；你在画布上点一下，动画就会从头重新播放一遍。右侧滑条改动后立刻生效，下方信息面板实时显示当前状态。