docs(I2): plugin guide (API v2 + example), library spec (wcadlib JSON+ZIP), changelog 2.0, readme rewrite
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# Plugin Guide – WebCAD Plugin API v2
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WebCAD Plugin API v2 erlaubt die Erweiterung des CAD um Werkzeuge,
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Panels und Block-Bibliotheken – ohne Kerncode anzufassen.
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## Plugin-Typ (PluginV2)
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```ts
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import type { PluginV2, ToolExtensionV2 } from './plugins';
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export const myPlugin: PluginV2 = {
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manifest: {
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id: 'my-tools',
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name: 'Meine Werkzeuge',
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version: '1.0.0',
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author: 'Du',
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description: 'Beschreibung',
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category: 'tools', // tools|elements|library|import-export|theme|other
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enabledByDefault: true,
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},
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tools: [/* ToolExtensionV2[] */],
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panels: [/* PanelExtension[] (optional) */],
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libraryProviders: [/* LibraryProviderExtension[] (optional) */],
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onInit?() {}, onActivate?() {}, onDeactivate?() {}, onDestroy?() {},
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};
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```
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## Werkzeug (ToolExtensionV2)
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Ein Werkzeug besteht aus Manifest, Options-Schema und Handlern:
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```ts
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export const myTool: ToolExtensionV2 = {
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manifest: {
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id: 'my-tool',
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label: 'Mein Werkzeug',
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icon: 'M',
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ribbonTab: 'canvas', // canvas|insert|format
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tags: ['basic'], // basic = sichtbar im simple-Mode, ['pro'] nur pro-Mode
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description: 'Was es tut',
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},
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optionsSchema: [
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{ key: 'width', label: 'Breite', type: 'number', min: 1, max: 500 },
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{ key: 'color', label: 'Farbe', type: 'color' },
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{ key: 'style', label: 'Stil', type: 'select',
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options: [{ value: 'a', label: 'A' }, { value: 'b', label: 'B' }] },
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{ key: 'frame', label: 'Rahmen', type: 'checkbox' },
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],
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handlers: {
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down(e, ctx) {
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// e.world = Weltkoordinaten, e.shift, e.ctrl
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// ctx.doc = CADDocument (CRUD + transact + undo)
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// ctx.setStatus('...'), ctx.setPreview?.(element)
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const c = ctx as FullToolContext;
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if (!c.doc) return;
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c.doc.transact(() => c.doc!.addElement({ /* CADElement */ }));
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},
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move(e, ctx) { /* Live-Preview */ },
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up(e, ctx) { /* Commit */ },
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key(k, ctx) { /* return true = konsumiert (z. B. Enter) */ },
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cancel(ctx) { /* ESC/Rechtsklick: Session-State zurücksetzen */ },
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},
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};
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```
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### Kernregeln
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1. **Eine Aktion = eine `doc.transact(() => ...)`** = genau ein Undo-Schritt.
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2. **Session-State als Modul-Member** (nicht in `options` – diese sind geteilter UI-State).
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3. **`cancel` setzt den Session-State immer zurück.**
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4. **Koordinaten-Konventionen:** rect `x/y` = Zentrum der BBox; circle/arc `el.x/el.y` = Zentrum; Winkel in Grad (0° = 3 Uhr, CCW).
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5. **Undo-fähig schreiben** nur über `doc.addElement/updateElement/deleteElements`.
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## Bibliotheks-Provider (LibraryProviderExtension)
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```ts
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const myProvider: LibraryProviderExtension = {
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id: 'my-catalog',
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label: 'Mein Katalog',
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async listFolders() { return [{ id: 'f1', label: 'Ordner', parentId: null }]; },
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async listBlocks(folderId) { return [/* LibBlock[] */]; },
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async getBlock(id) { return /* LibBlock */; },
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};
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```
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`LibBlock.payload` = JSON-String eines CADElement-Arrays → Drag&Drop
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in die Zeichenfläche funktioniert automatisch über den bestehenden
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Drop-Kanal. Thumbnail = eigenständiges SVG.
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## Registrierung
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Built-in-Plugins werden in `src/plugins/index.ts` per
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`pluginRegistry.registerV2(plugin)` registriert; `enabledByDefault`
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macht sie aktiv (alternativ per `pluginRegistry.enableV2(id)`).
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## Beispiel: Minimal-Plugin
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```ts
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// plugins/builtin/stamp/index.ts
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import type { PluginV2, ToolExtensionV2 } from '../../types';
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const stampTool: ToolExtensionV2 = {
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manifest: {
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id: 'stamp', label: 'Stempel', icon: '\u25c6',
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ribbonTab: 'insert', tags: ['basic'],
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description: 'Platziert ein Quadrat',
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},
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optionsSchema: [{ key: 'size', label: 'Größe', type: 'number', min: 10, max: 200 }],
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handlers: {
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down(e, ctx) {
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const c = ctx as any;
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if (!c.doc) return;
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const size = (ctx.options.size as number | undefined) ?? 50;
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c.doc.transact(() => c.doc.addElement({
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id: `stamp_${Date.now()}`,
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type: 'rect', layerId: 'layer-0',
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x: e.world.x, y: e.world.y,
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width: size, height: size,
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properties: {},
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}));
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ctx.setStatus('Stempel platziert');
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},
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},
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};
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export const stampPlugin: PluginV2 = {
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manifest: {
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id: 'stamp', name: 'Stempel', version: '1.0.0', author: 'WebCAD',
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description: 'Beispielplugin', category: 'elements', enabledByDefault: true,
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},
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tools: [stampTool],
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};
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```
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Registrieren in `src/plugins/index.ts`:
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```ts
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pluginRegistry.registerV2(stampPlugin);
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```
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