Clyune Component GalleryIcicle Chart · How it works & code
Rectangular hierarchical partition, child blocks below parent and sized by value
Runtime logic
Visiting `/dataviz/icicle`, DemoHost lazy-loads `demos/kits/kit-dataviz.js` (registry `mod: 'kit-dataviz'`) and calls `mount(host, { variant: 'icicle' })`. mount resolves the variant to family `icicle`; `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; rng — Seeded deterministic PRNG (same seed, same result); 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.clear — Clears with the background colour (translucent = trails); S.get — Reads current control values; S.onFrame — Registers a per-frame callback; its return value feeds the info panel; ctx.fill() — Fills the current path; ctx.stroke() — Strokes 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.fillText() — Draws filled text; ctx.measureText() — Measures text width
Source code
frontend/src/demos/kits/kit-dataviz.js: FAM.icicle (L692-L733)
Code walkthrough
L694-694: Control definitions (colour/speed/size/count/extras): Starting hue, Gap between blocks, Level depth, Branch count, Horizontal layout, Monochrome. L695-695: Preset buttons: name → parameter overrides (6). L696-704: Info-panel content: live rows(v), formula, notes, params, steps. L705-732: Init function: sets up state and returns the per-frame callback: registers pointer handlers `S.onDown`; draws with Canvas 2D `fill`, `stroke`; math via `Math.round`, `Math.exp`, `Math.max`, `Math.min`; returns readouts `depth`, `leaves`, `path`, `val`, `pv`, `sp`, `sa` … to the info panel.
Principles
Block of layer d in row d (or column) Size of subblocks = Subvalue / Parent × Father block width, located directly below the parent block Click the drill: Put the selected block in the slot [x₀, x₁] Linear magnify to the full width Icicle Chart （Icicle / Partition）It's a sun map"Straighten"：最上面一行是整体，往下每一行是下一层的细分，每个子块都正好在父块的正下方，宽度按数值分配。 The rectangle is easier to compare with the sun map, and more easily text. Click Any block will expand it into a full width (bottom drill) by clicking on the top line. The data fluctuated slightly, and the size of the sub-block can be seen to change with the parent.