- gTangentPoints(O, P, r): касательные через полярно-полярную точку M=O+v*r²/d, h=r√(d²-r²)/d
- tangent: 2 derived_line (which=0/1) из внешней точки к окружности; оба пересчитываются
при движении точки или изменении радиуса/центра; _pendingCircRef хранит окружность-источник
- translate: derived point P'=P+(B-A) по вектору AB; 3-фазный ввод с onHintChange(tool,2/3)
- _hitTestCircle(): найти окружность под курсором (HIT=12px)
- _drawLineRefHighlight(): расширен для circle (рисует дугу подсветки)
- _pendingCircRef очищается в setTool()
- lab.html: кнопки Симметрия/Перенос/Касательные, _GEO_PHASE_HINTS словарь,
_geoShowHint(name, phase) принимает числовой phase вместо boolean
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- GeoEngine: _dependsOn/recompute для constr='reflect' и 'ngon_vertex'
- reflect: производная точка-отражение (P'=2·foot-P), зависит от axis+srcPt
- ngon: правильный n-угольник по центру и вершине; вершины v1..vn-1 = derived
points (constr='ngon_vertex', хранят srcCenter/srcVertex/k/n); при движении
центра/вершины все вершины автоматически пересчитываются
- GeoSim: _ngonSides=6, setNgonSides(n), инструменты 'reflect'/'ngon' в _handleToolClick
- lab.html: кнопки Симметрия и n-угольник, +/- контроллер сторон, хинты Phase 2
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Add js/sidebar.js: generates full sidebar HTML into #app-sidebar,
handles role-based visibility, active link (with prefix matching),
toggle wiring, collapsed state, board/features/notif init
- Replace <aside class="sidebar">...</aside> with <aside id="app-sidebar">
across all 35 standard-layout pages via scripts/apply-sidebar.js
- Add notifications.js to 5 pages that were missing it
- Fix api.js initPage(): skip toggle re-wiring if data-sb-wired set,
fix active link selector .sb-item → .sb-link
- Remove stale sbl-*/nav-admin/btn-upload-nav getElementById calls
that crashed after sidebar replacement (lab, classes, collection,
crossword, hangman, knowledge-map, library, pet, profile)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Classroom performance:
- WebSocket server (ws-server.js) for low-latency cursor & stroke preview
Replaces HTTP POST per event → eliminates per-message auth overhead
Session member cache (30s TTL) avoids SQLite query per WS message
Fallback to HTTP POST when WS not connected
- Cursor throttle reduced 100ms → 33ms (~30fps)
- Stroke preview throttle reduced 50ms → 20ms
- whiteboard.js: render() is now rAF-gated (_doRender/_rafPending)
Multiple render() calls within one frame collapse into one repaint
document.hidden check — zero CPU when tab is in background
visibilitychange listener restores canvas on tab focus
Guest board:
- guestClassroom.js route: public token-based read-only access
- guest-board.html: name entry + read-only whiteboard + SSE
- SSE: addGuestClient/removeGuestClient/emitToGuests
Screen share picker:
- Discord-style modal with tab switching (screen/window/tab)
- Live video preview before confirming share
- useExistingScreenStream() in ClassroomRTC
Fullscreen exit overlay:
- #cr-fs-exit-overlay button inside cr-board-wrap
- Visible only via CSS :fullscreen selector (touchpad users)
File sharing from library:
- Teacher picks file from library, sends as styled card in chat
- crDownloadLibraryFile() fetches with Bearer auth
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Maxim Dolgolyov