一个快速的、仅浏览器的图表工具（想象一下小型的Figma/Excalidraw）。绘制形状， 用自动吸附的线条连接起来，插入图标，所有自动保存都会生效 本地。无后端——板块存储在IndexedDB，并通过单一URL共享。

堆叠

• 渲染： PixiJS v8（WebGL）——GPU加速，按需渲染。
• **状态：**纳米存储器——微小的反应原子。无反应。
• Persistence： 通过 idb-keyval IndexedDB。
• 共享： 板块 JSON → lz-string 查询字符串压缩→。
• Build： Vite + TypeScript。以静态文件形式发布（由 nginx 在 Dockerfile 中提供）。

命令

Claude 代码技能（生成图表到Sketch Lab）

代理可以发送 Sketch Lab GeneratedGraph JSON 并以 ?g= URL 打开。 该技能托管在应用中：

• 技能档案：https://sketchlab.webdevcody.com/skills/sketch-lab/SKILL.md

安装到 Claude Code：

然后重启Claude代码，要求Sketch Lab图。代理构建 https://sketchlab.webdevcody.com/?g= 并打开了它。

表演如何用多种形式保持平坦

• 脏集更新，不是完整差值。 动作会变异纳米存储器 并且 告诉

Sketch Lab

A fast, browser-only diagram tool (think a tiny Figma/Excalidraw). Draw shapes, connect them with auto-snapping lines, drop in icons, and everything auto-saves locally. No backend — boards live in IndexedDB and are shareable via a single URL.

Stack

• Rendering: PixiJS v8 (WebGL) — GPU-accelerated, render-on-demand.
• State: nanostores — tiny reactive atoms. No React.
• Persistence: IndexedDB via idb-keyval.
• Sharing: board JSON → lz-string compression → query string.
• Build: Vite + TypeScript. Ships as static files (served by nginx in the Dockerfile).

Commands

npm install
npm run dev       # local dev server (http://localhost:5173)
npm run build     # type-check + production build to dist/
npm run preview   # serve the production build

Claude Code skill (generate diagrams into Sketch Lab)

Agents can emit Sketch Lab GeneratedGraph JSON and open it with a ?g= URL. The skill is hosted with the app:

• Skill file: https://sketchlab.webdevcody.com/skills/sketch-lab/SKILL.md

Install into Claude Code:

mkdir -p ~/.claude/skills/sketch-lab
curl -fsSL https://sketchlab.webdevcody.com/skills/sketch-lab/SKILL.md \
  -o ~/.claude/skills/sketch-lab/SKILL.md

Then restart Claude Code and ask for a Sketch Lab diagram. The agent builds https://sketchlab.webdevcody.com/?g= and opens it.

How performance is kept flat with many shapes

• Dirty-set updates, not full diffs. Actions mutate the nanostore and tell the renderer exactly which node/edge ids changed (scene.updateNode(id)). Dragging one of thousands of shapes touches only that node + its incident edges.
• Render-on-demand. The Pixi ticker is stopped; app.render() is scheduled once per animation frame only when something is dirty.
• Per-view redraw guards. A shape’s Graphics is only re-tessellated when its geometry/style actually changes; moving it just sets a container transform.
• All hit-testing in world space (not Pixi’s event tree), so selection/marquee/ connect/resize are O(changed), and the camera is a single container transform.

Architecture

src/
  state/        types, nanostore atoms (store.ts), mutation actions (actions.ts)
  render/       Pixi scene singleton (scene.ts), shape/edge view builders,
                geometry/snapping math, vector icon registry
  interaction/  controller.ts (pointer/keyboard state machine), camera, viewport,
                text-editor overlay, "/" icon palette
  persistence/  IndexedDB (db.ts), autosave, URL share encode/decode
  ui/           dashboard, editor chrome (toolbar/colors/zoom), DOM helpers, router
  main.ts       hash router: editor (#/board/:id), ?b= board share, ?g= GeneratedGraph import

Shortcuts

V select · T text · R rectangle · O circle · L connector line ·