From 64ebafae8f160f4140419887147a253942ed256c Mon Sep 17 00:00:00 2001
From: Michael Stangl <m.stangl@schoenenberger.de>
Date: Tue, 28 Apr 2026 14:57:40 +0200
Subject: [PATCH] =?UTF-8?q?einfacher=20F=C3=B6rderer=20und=20Polylinie=20h?=
 =?UTF-8?q?inz?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 client/src/App.tsx                          |  15 +-
 client/src/bindings/PolylinieBindingUtil.ts |  95 +++++++++
 client/src/components/ShapePanel.tsx        |  41 +++-
 client/src/polylinie.css                    |   5 +
 client/src/shapes/FoerdererShapeUtil.tsx    | 205 +++++++++++++++++++
 client/src/shapes/PolylinieShapeUtil.tsx    | 157 +++++++++++++++
 client/src/shapes/shape-config.ts           |  16 ++
 client/src/shapes/shape-types.ts            |  57 +++++-
 client/src/tools/PolylinieDrawing.ts        | 212 ++++++++++++++++++++
 client/src/tools/PolylinieIdle.ts           |  30 +++
 client/src/tools/PolylinieTool.ts           |  12 ++
 client/src/utils/angle-snap.ts              |  56 ++++++
 12 files changed, 895 insertions(+), 6 deletions(-)
 create mode 100644 client/src/bindings/PolylinieBindingUtil.ts
 create mode 100644 client/src/polylinie.css
 create mode 100644 client/src/shapes/FoerdererShapeUtil.tsx
 create mode 100644 client/src/shapes/PolylinieShapeUtil.tsx
 create mode 100644 client/src/tools/PolylinieDrawing.ts
 create mode 100644 client/src/tools/PolylinieIdle.ts
 create mode 100644 client/src/tools/PolylinieTool.ts
 create mode 100644 client/src/utils/angle-snap.ts

diff --git a/client/src/App.tsx b/client/src/App.tsx
index 80b282c..ca5ecbe 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -1,16 +1,27 @@
 import { Tldraw } from 'tldraw'
 import 'tldraw/tldraw.css'
+import './polylinie.css'
 import './shapes/shape-types' // Type-Augmentation für Custom Shapes
 import { PufferShapeUtil } from './shapes/PufferShapeUtil'
 import { KreiselShapeUtil } from './shapes/KreiselShapeUtil'
+import { FoerdererShapeUtil } from './shapes/FoerdererShapeUtil'
+import { PolylinieShapeUtil } from './shapes/PolylinieShapeUtil'
+import { PolylinieTool } from './tools/PolylinieTool'
+import { PolylinieBindingUtil } from './bindings/PolylinieBindingUtil'
 import { ShapePanel } from './components/ShapePanel'
 
-const customShapeUtils = [PufferShapeUtil, KreiselShapeUtil]
+const customShapeUtils = [PufferShapeUtil, KreiselShapeUtil, FoerdererShapeUtil, PolylinieShapeUtil]
+const customTools = [PolylinieTool]
+const customBindingUtils = [PolylinieBindingUtil]
 
 export default function App() {
   return (
     <div style={{ position: 'fixed', inset: 0 }}>
-      <Tldraw shapeUtils={customShapeUtils}>
+      <Tldraw
+        shapeUtils={customShapeUtils}
+        tools={customTools}
+        bindingUtils={customBindingUtils}
+      >
         <ShapePanel />
       </Tldraw>
     </div>
diff --git a/client/src/bindings/PolylinieBindingUtil.ts b/client/src/bindings/PolylinieBindingUtil.ts
new file mode 100644
index 0000000..40fe521
--- /dev/null
+++ b/client/src/bindings/PolylinieBindingUtil.ts
@@ -0,0 +1,95 @@
+import {
+  BindingUtil,
+  TLBaseBinding,
+  BindingOnShapeChangeOptions,
+  BindingOnShapeDeleteOptions,
+  T,
+  sortByIndex,
+} from 'tldraw'
+import { PolylinieShape, PolyliniePoint, PolylinieConnectionProps } from '../shapes/shape-types'
+
+export type PolylinieConnectionBinding = TLBaseBinding<
+  'polylinie-connection',
+  PolylinieConnectionProps
+>
+
+export class PolylinieBindingUtil extends BindingUtil<PolylinieConnectionBinding> {
+  static override type = 'polylinie-connection' as const
+
+  static override props = {
+    terminal: T.string,
+    normalizedAnchor: T.object({
+      x: T.number,
+      y: T.number,
+    }),
+  }
+
+  override getDefaultProps(): PolylinieConnectionProps {
+    return {
+      terminal: 'end',
+      normalizedAnchor: { x: 0, y: 0 },
+    }
+  }
+
+  override onAfterChangeToShape(options: BindingOnShapeChangeOptions<PolylinieConnectionBinding>) {
+    const { binding, shapeAfter } = options
+
+    const polyShape = this.editor.getShape<PolylinieShape>(binding.fromId)
+    if (!polyShape) return
+
+    const targetX = shapeAfter.x
+    const targetY = shapeAfter.y
+
+    const anchor = binding.props.normalizedAnchor
+    const termPt = this._getTerminalPoint(polyShape, binding.props.terminal)
+    const dx = targetX + anchor.x - (polyShape.x + termPt.x)
+    const dy = targetY + anchor.y - (polyShape.y + termPt.y)
+
+    if (Math.abs(dx) < 0.01 && Math.abs(dy) < 0.01) return
+
+    const points = { ...polyShape.props.points }
+    const sorted = Object.values(points).sort(sortByIndex)
+
+    if (sorted.length < 2) return
+
+    const isEnd = binding.props.terminal === 'end'
+    const terminalIdx = isEnd ? sorted.length - 1 : 0
+    const terminal = sorted[terminalIdx]
+
+    points[terminal.id] = {
+      ...terminal,
+      x: terminal.x + dx,
+      y: terminal.y + dy,
+    }
+
+    if (sorted.length >= 3) {
+      const adjIdx = isEnd ? sorted.length - 2 : 1
+      const adj = sorted[adjIdx]
+      points[adj.id] = {
+        ...adj,
+        x: adj.x + dx * 0.5,
+        y: adj.y + dy * 0.5,
+      }
+    }
+
+    this.editor.updateShape<PolylinieShape>({
+      id: polyShape.id,
+      type: 'polylinie',
+      props: { points },
+    })
+  }
+
+  override onBeforeDeleteToShape(_options: BindingOnShapeDeleteOptions<PolylinieConnectionBinding>) {
+    // Binding entfernen, Polylinie behalten
+  }
+
+  private _getTerminalPoint(
+    shape: PolylinieShape,
+    terminal: string
+  ): { x: number; y: number } {
+    const sorted = Object.values(shape.props.points).sort(sortByIndex)
+    if (sorted.length === 0) return { x: 0, y: 0 }
+    if (terminal === 'start') return sorted[0]
+    return sorted[sorted.length - 1]
+  }
+}
diff --git a/client/src/components/ShapePanel.tsx b/client/src/components/ShapePanel.tsx
index a4bd285..f01024b 100644
--- a/client/src/components/ShapePanel.tsx
+++ b/client/src/components/ShapePanel.tsx
@@ -1,6 +1,6 @@
-import { useEditor } from 'tldraw'
+import { useEditor, useValue } from 'tldraw'
 import { useCallback } from 'react'
-import { PUFFER_CONFIG, KREISEL_CONFIG } from '../shapes/shape-config'
+import { PUFFER_CONFIG, KREISEL_CONFIG, FOERDERER_CONFIG } from '../shapes/shape-config'
 
 /** Nächste freie Nummer für einen Shape-Typ ermitteln. */
 function nextNumber(editor: ReturnType<typeof useEditor>, type: string): number {
@@ -56,6 +56,30 @@ export function ShapePanel() {
     })
   }, [editor])
 
+  const createFoerderer = useCallback(() => {
+    const nr = nextNumber(editor, 'foerderer')
+    const center = editor.getViewportScreenCenter()
+    const point = editor.screenToPage(center)
+    editor.createShape({
+      type: 'foerderer',
+      x: point.x - FOERDERER_CONFIG.defaultEndX / 2,
+      y: point.y,
+      props: {
+        endX: FOERDERER_CONFIG.defaultEndX,
+        endY: FOERDERER_CONFIG.defaultEndY,
+        spacing: FOERDERER_CONFIG.defaultSpacing,
+        label: `Förderer_${nr}`,
+      },
+    })
+  }, [editor])
+
+  const activatePolylinie = useCallback(() => {
+    editor.setCurrentTool('polylinie')
+  }, [editor])
+
+  const currentToolId = useValue('current tool', () => editor.getCurrentToolId(), [editor])
+  const isPolylinieActive = currentToolId === 'polylinie'
+
   const syncToServer = useCallback(async () => {
     const allShapes = editor.getCurrentPageShapes()
 
@@ -99,6 +123,19 @@ export function ShapePanel() {
       <button onClick={createKreisel} style={btnStyle}>
         ◎ Kreisel
       </button>
+      <button onClick={createFoerderer} style={btnStyle}>
+        ═ Förderer
+      </button>
+      <button
+        onClick={activatePolylinie}
+        style={{
+          ...btnStyle,
+          background: isPolylinieActive ? '#404040' : '#f8f8f8',
+          color: isPolylinieActive ? 'white' : 'inherit',
+        }}
+      >
+        ⚡ Polylinie
+      </button>
       <hr style={{ width: '100%', margin: '4px 0' }} />
       <button onClick={syncToServer} style={{ ...btnStyle, background: '#e0f0ff' }}>
         ↑ Sync Server
diff --git a/client/src/polylinie.css b/client/src/polylinie.css
new file mode 100644
index 0000000..bd8afbb
--- /dev/null
+++ b/client/src/polylinie.css
@@ -0,0 +1,5 @@
+/* Dunkler Hintergrund wenn das Polylinie-Tool aktiv ist */
+.tl-container.polylinie-active .tl-canvas {
+  background-color: #d0d0d0 !important;
+  transition: background-color 0.2s ease;
+}
diff --git a/client/src/shapes/FoerdererShapeUtil.tsx b/client/src/shapes/FoerdererShapeUtil.tsx
new file mode 100644
index 0000000..81fefe2
--- /dev/null
+++ b/client/src/shapes/FoerdererShapeUtil.tsx
@@ -0,0 +1,205 @@
+import {
+  ShapeUtil,
+  TLHandle,
+  TLShapePartial,
+  Rectangle2d,
+  HTMLContainer,
+  IndexKey,
+} from 'tldraw'
+import { FoerdererShape, foerdererShapeProps } from './shape-types'
+import { FOERDERER_CONFIG as CFG } from './shape-config'
+
+/** Förderer: Doppellinie (durchgezogen + gestrichelt) mit Endpunkt-Kreisen. */
+export class FoerdererShapeUtil extends ShapeUtil<FoerdererShape> {
+  static override type = 'foerderer' as const
+  static override props = foerdererShapeProps
+
+  getDefaultProps(): FoerdererShape['props'] {
+    return {
+      endX: CFG.defaultEndX,
+      endY: CFG.defaultEndY,
+      spacing: CFG.defaultSpacing,
+      label: 'Förderer',
+    }
+  }
+
+  getGeometry(shape: FoerdererShape) {
+    const { endX, endY, spacing } = shape.props
+    // Senkrechte zum Richtungsvektor für Spacing-Offset
+    const len = Math.sqrt(endX * endX + endY * endY) || 1
+    const perpX = (-endY / len) * spacing
+    const perpY = (endX / len) * spacing
+
+    // Alle 4 Eckpunkte der beiden Linien + Endpunkt-Kreise
+    const xs = [0, endX, perpX, endX + perpX]
+    const ys = [0, endY, perpY, endY + perpY]
+    const pad = CFG.endpointRadius
+    const minX = Math.min(...xs) - pad
+    const minY = Math.min(...ys) - pad
+    const maxX = Math.max(...xs) + pad
+    const maxY = Math.max(...ys) + pad
+
+    return new Rectangle2d({
+      width: maxX - minX,
+      height: maxY - minY,
+      isFilled: false,
+    })
+  }
+
+  override canResize() {
+    return false
+  }
+
+  override onRotate(initial: FoerdererShape, current: FoerdererShape): TLShapePartial<FoerdererShape> {
+    const HALF_PI = Math.PI / 2
+    const snapped = Math.round(current.rotation / HALF_PI) * HALF_PI
+    return { id: current.id, type: 'foerderer', x: initial.x, y: initial.y, rotation: snapped }
+  }
+
+  /** Offset vom Shape-Ursprung zum Geometry-Ursprung (wegen negativer Koordinaten) */
+  private _getOffset(shape: FoerdererShape) {
+    const { endX, endY, spacing } = shape.props
+    const len = Math.sqrt(endX * endX + endY * endY) || 1
+    const perpX = (-endY / len) * spacing
+    const perpY = (endX / len) * spacing
+    const xs = [0, endX, perpX, endX + perpX]
+    const ys = [0, endY, perpY, endY + perpY]
+    const pad = CFG.endpointRadius
+    return {
+      ox: Math.min(...xs) - pad,
+      oy: Math.min(...ys) - pad,
+    }
+  }
+
+  override getHandles(shape: FoerdererShape): TLHandle[] {
+    const { ox, oy } = this._getOffset(shape)
+    return [
+      {
+        id: 'start',
+        type: 'vertex',
+        x: 0 - ox,
+        y: 0 - oy,
+        index: 'a1' as IndexKey,
+        canSnap: true,
+      },
+      {
+        id: 'end',
+        type: 'vertex',
+        x: shape.props.endX - ox,
+        y: shape.props.endY - oy,
+        index: 'a2' as IndexKey,
+        canSnap: true,
+      },
+    ]
+  }
+
+  override onHandleDrag(
+    shape: FoerdererShape,
+    { handle }: { handle: TLHandle }
+  ): TLShapePartial<FoerdererShape> | void {
+    if (handle.id === 'end') {
+      const { ox, oy } = this._getOffset(shape)
+      const newEndX = handle.x + ox
+      const newEndY = handle.y + oy
+      const len = Math.sqrt(newEndX * newEndX + newEndY * newEndY)
+      if (len < CFG.minLength) return
+
+      return {
+        id: shape.id,
+        type: 'foerderer',
+        props: { ...shape.props, endX: newEndX, endY: newEndY },
+      }
+    }
+
+    if (handle.id === 'start') {
+      // Start-Handle: Shape-Position verschieben, End bleibt in Weltkoordinaten
+      const pagePoint = this.editor.inputs.currentPagePoint
+      const dx = pagePoint.x - shape.x
+      const dy = pagePoint.y - shape.y
+      const newEndX = shape.props.endX - dx
+      const newEndY = shape.props.endY - dy
+      const len = Math.sqrt(newEndX * newEndX + newEndY * newEndY)
+      if (len < CFG.minLength) return
+
+      return {
+        id: shape.id,
+        type: 'foerderer',
+        x: pagePoint.x,
+        y: pagePoint.y,
+        props: { ...shape.props, endX: newEndX, endY: newEndY },
+      }
+    }
+  }
+
+  component(shape: FoerdererShape) {
+    const { endX, endY, spacing } = shape.props
+    const { ox, oy } = this._getOffset(shape)
+
+    // Senkrechte für parallele Linie
+    const len = Math.sqrt(endX * endX + endY * endY) || 1
+    const perpX = (-endY / len) * spacing
+    const perpY = (endX / len) * spacing
+
+    // Punkte relativ zum SVG-Ursprung (offset-korrigiert)
+    const sx = 0 - ox
+    const sy = 0 - oy
+    const ex = endX - ox
+    const ey = endY - oy
+
+    const bounds = this.getGeometry(shape).getBounds()
+    const totalW = bounds.w
+    const totalH = bounds.h
+
+    return (
+      <HTMLContainer>
+        <svg
+          width={totalW}
+          height={totalH}
+          style={{ overflow: 'visible' }}
+        >
+          {/* Durchgezogene Linie */}
+          <line
+            x1={sx} y1={sy} x2={ex} y2={ey}
+            stroke="black" strokeWidth={CFG.strokeWidth}
+          />
+          {/* Gestrichelte parallele Linie */}
+          <line
+            x1={sx + perpX} y1={sy + perpY}
+            x2={ex + perpX} y2={ey + perpY}
+            stroke="black" strokeWidth={CFG.strokeWidth}
+            strokeDasharray="8 4"
+          />
+          {/* Start-Kreis */}
+          <circle
+            cx={sx} cy={sy} r={CFG.endpointRadius}
+            fill="black" stroke="black" strokeWidth={1}
+          />
+          {/* End-Kreis */}
+          <circle
+            cx={ex} cy={ey} r={CFG.endpointRadius}
+            fill="black" stroke="black" strokeWidth={1}
+          />
+          {/* Label */}
+          <text
+            x={(sx + ex) / 2}
+            y={(sy + ey) / 2 - 12}
+            textAnchor="middle"
+            dominantBaseline="central"
+            fontSize={14}
+            fill="#666"
+            style={{ pointerEvents: 'none', userSelect: 'none' }}
+          >
+            {shape.props.label}
+          </text>
+        </svg>
+      </HTMLContainer>
+    )
+  }
+
+  indicator(shape: FoerdererShape) {
+    const bounds = this.getGeometry(shape).getBounds()
+    return (
+      <rect x={0} y={0} width={bounds.w} height={bounds.h} />
+    )
+  }
+}
diff --git a/client/src/shapes/PolylinieShapeUtil.tsx b/client/src/shapes/PolylinieShapeUtil.tsx
new file mode 100644
index 0000000..ea44125
--- /dev/null
+++ b/client/src/shapes/PolylinieShapeUtil.tsx
@@ -0,0 +1,157 @@
+import {
+  ShapeUtil,
+  TLHandle,
+  TLShapePartial,
+  Polyline2d,
+  HTMLContainer,
+  IndexKey,
+  sortByIndex,
+  Vec,
+} from 'tldraw'
+import { PolylinieShape, PolyliniePoint, polylinieShapeProps } from './shape-types'
+import { POLYLINIE_CONFIG as CFG } from './shape-config'
+import { snapToAngleGrid } from '../utils/angle-snap'
+
+/** Polylinie: Mehrsegment-Linie mit Winkel-Snapping bei der Bearbeitung. */
+export class PolylinieShapeUtil extends ShapeUtil<PolylinieShape> {
+  static override type = 'polylinie' as const
+  static override props = polylinieShapeProps
+
+  getDefaultProps(): PolylinieShape['props'] {
+    return {
+      points: {},
+      label: 'Polylinie',
+    }
+  }
+
+  /** Punkte sortiert nach Index zurückgeben. */
+  private _sortedPoints(shape: PolylinieShape): PolyliniePoint[] {
+    return Object.values(shape.props.points).sort(sortByIndex)
+  }
+
+  getGeometry(shape: PolylinieShape) {
+    const pts = this._sortedPoints(shape)
+    if (pts.length < 2) {
+      return new Polyline2d({ points: [new Vec(0, 0), new Vec(1, 1)] })
+    }
+    return new Polyline2d({
+      points: pts.map((p) => new Vec(p.x, p.y)),
+    })
+  }
+
+  override canResize() {
+    return false
+  }
+
+  override hideRotateHandle() {
+    return true
+  }
+
+  override hideSelectionBoundsFg() {
+    return true
+  }
+
+  override hideSelectionBoundsBg() {
+    return true
+  }
+
+  override getHandles(shape: PolylinieShape): TLHandle[] {
+    const pts = this._sortedPoints(shape)
+    return pts.map((p) => ({
+      id: p.id,
+      type: 'vertex' as const,
+      x: p.x,
+      y: p.y,
+      index: p.index as IndexKey,
+      canSnap: true,
+    }))
+  }
+
+  override onHandleDrag(
+    shape: PolylinieShape,
+    { handle }: { handle: TLHandle }
+  ): TLShapePartial<PolylinieShape> | void {
+    const pts = this._sortedPoints(shape)
+    const idx = pts.findIndex((p) => p.id === handle.id)
+    if (idx < 0) return
+
+    // Winkel-Snapping: nur wenn es einen Vorgänger UND Vor-Vorgänger gibt
+    const prev = idx > 0 ? pts[idx - 1] : null
+    const prevPrev = idx > 1 ? pts[idx - 2] : null
+
+    let newPos = { x: handle.x, y: handle.y }
+    if (prev && prevPrev) {
+      newPos = snapToAngleGrid(prev, prevPrev, newPos)
+    }
+
+    // Auch Nachfolger-Richtung berücksichtigen: snap relativ zum Nachfolger
+    const next = idx < pts.length - 1 ? pts[idx + 1] : null
+    const nextNext = idx < pts.length - 2 ? pts[idx + 2] : null
+    if (next && nextNext) {
+      // Zweiter Snap-Pass für Nachfolger-Kompatibilität (optional, Hauptsnap ist Vorgänger)
+    }
+
+    const updatedPoints = { ...shape.props.points }
+    updatedPoints[handle.id] = {
+      ...updatedPoints[handle.id],
+      x: newPos.x,
+      y: newPos.y,
+    }
+
+    return {
+      id: shape.id,
+      type: 'polylinie',
+      props: { ...shape.props, points: updatedPoints },
+    }
+  }
+
+  component(shape: PolylinieShape) {
+    const pts = this._sortedPoints(shape)
+    if (pts.length < 2) return null
+
+    // Bounding-Box berechnen
+    let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity
+    for (const p of pts) {
+      minX = Math.min(minX, p.x)
+      minY = Math.min(minY, p.y)
+      maxX = Math.max(maxX, p.x)
+      maxY = Math.max(maxY, p.y)
+    }
+    const pad = 4
+    const w = maxX - minX + pad * 2
+    const h = maxY - minY + pad * 2
+
+    const pointStr = pts.map((p) => `${p.x - minX + pad},${p.y - minY + pad}`).join(' ')
+
+    return (
+      <HTMLContainer>
+        <svg
+          width={w}
+          height={h}
+          style={{
+            overflow: 'visible',
+            position: 'absolute',
+            left: minX - pad,
+            top: minY - pad,
+          }}
+        >
+          <polyline
+            points={pointStr}
+            fill="none"
+            stroke={CFG.strokeColor}
+            strokeWidth={CFG.strokeWidth}
+            strokeLinejoin="round"
+            strokeLinecap="round"
+          />
+        </svg>
+      </HTMLContainer>
+    )
+  }
+
+  indicator(shape: PolylinieShape) {
+    const pts = this._sortedPoints(shape)
+    if (pts.length < 2) return null
+    const d = pts.map((p, i) => `${i === 0 ? 'M' : 'L'} ${p.x} ${p.y}`).join(' ')
+    return <path d={d} />
+  }
+}
diff --git a/client/src/shapes/shape-config.ts b/client/src/shapes/shape-config.ts
index 3caada5..5bad0d3 100644
--- a/client/src/shapes/shape-config.ts
+++ b/client/src/shapes/shape-config.ts
@@ -24,3 +24,19 @@ export const KREISEL_CONFIG = {
   // Maxima
   maxAbstand: 4000,
 }
+
+export const FOERDERER_CONFIG = {
+  defaultEndX: 300,
+  defaultEndY: 0,
+  defaultSpacing: 20,
+  minLength: 50,
+  endpointRadius: 8,
+  strokeWidth: 2,
+}
+
+export const POLYLINIE_CONFIG = {
+  strokeWidth: 2,
+  strokeColor: '#000000',
+  handleRadius: 5,
+  snapAngles: [-90, -45, -22.5, 0, 22.5, 45, 90],
+}
diff --git a/client/src/shapes/shape-types.ts b/client/src/shapes/shape-types.ts
index 281c222..b7595c2 100644
--- a/client/src/shapes/shape-types.ts
+++ b/client/src/shapes/shape-types.ts
@@ -1,4 +1,4 @@
-import { T, TLBaseShape } from 'tldraw'
+import { T, TLBaseShape, IndexKey } from 'tldraw'
 
 // --- Puffer ---
 export type PufferShapeProps = {
@@ -30,10 +30,63 @@ export const kreiselShapeProps = {
   label: T.string,
 }
 
-// --- tldraw Type-Augmentation: Custom Shapes registrieren ---
+// --- Förderer ---
+export type FoerdererShapeProps = {
+  endX: number
+  endY: number
+  spacing: number
+  label: string
+}
+
+export type FoerdererShape = TLBaseShape<'foerderer', FoerdererShapeProps>
+
+export const foerdererShapeProps = {
+  endX: T.number,
+  endY: T.number,
+  spacing: T.number,
+  label: T.string,
+}
+
+// --- Polylinie ---
+export type PolyliniePoint = {
+  id: string
+  index: IndexKey
+  x: number
+  y: number
+}
+
+export type PolylinieShapeProps = {
+  points: Record<string, PolyliniePoint>
+  label: string
+}
+
+export type PolylinieShape = TLBaseShape<'polylinie', PolylinieShapeProps>
+
+export const polylinieShapeProps = {
+  points: T.dict(T.string, T.object({
+    id: T.string,
+    index: T.indexKey,
+    x: T.number,
+    y: T.number,
+  })),
+  label: T.string,
+}
+
+// --- Polylinie-Binding ---
+export type PolylinieConnectionProps = {
+  terminal: string
+  normalizedAnchor: { x: number; y: number }
+}
+
+// --- tldraw Type-Augmentation: Custom Shapes + Bindings registrieren ---
 declare module '@tldraw/tlschema' {
   interface TLGlobalShapePropsMap {
     puffer: PufferShapeProps
     kreisel: KreiselShapeProps
+    foerderer: FoerdererShapeProps
+    polylinie: PolylinieShapeProps
+  }
+  interface TLGlobalBindingPropsMap {
+    'polylinie-connection': PolylinieConnectionProps
   }
 }
diff --git a/client/src/tools/PolylinieDrawing.ts b/client/src/tools/PolylinieDrawing.ts
new file mode 100644
index 0000000..190852e
--- /dev/null
+++ b/client/src/tools/PolylinieDrawing.ts
@@ -0,0 +1,212 @@
+import {
+  StateNode,
+  TLEventHandlers,
+  TLShapeId,
+  createShapeId,
+  IndexKey,
+  getIndexAbove,
+} from 'tldraw'
+import { PolyliniePoint } from '../shapes/shape-types'
+import { snapToAngleGrid, Vec2 } from '../utils/angle-snap'
+
+/** Drawing-State: Klick für Klick werden Punkte platziert. Doppelklick beendet. */
+export class PolylinieDrawing extends StateNode {
+  static override id = 'drawing'
+
+  private shapeId: TLShapeId = '' as TLShapeId
+  private points: PolyliniePoint[] = []
+  private nextIndex: IndexKey = 'a1' as IndexKey
+
+  override onEnter() {
+    const pagePoint = this.editor.inputs.currentPagePoint
+    this.shapeId = createShapeId()
+    this.nextIndex = 'a1' as IndexKey
+
+    const firstPoint: PolyliniePoint = {
+      id: 'p0',
+      index: this.nextIndex,
+      x: 0,
+      y: 0,
+    }
+    this.nextIndex = getIndexAbove(this.nextIndex)
+
+    // Vorschau-Punkt (wird bei Mausbewegung aktualisiert)
+    const previewPoint: PolyliniePoint = {
+      id: 'preview',
+      index: this.nextIndex,
+      x: 0,
+      y: 0,
+    }
+    this.nextIndex = getIndexAbove(this.nextIndex)
+
+    this.points = [firstPoint, previewPoint]
+
+    const pointsRecord: Record<string, PolyliniePoint> = {}
+    for (const p of this.points) {
+      pointsRecord[p.id] = p
+    }
+
+    this.editor.createShape({
+      id: this.shapeId,
+      type: 'polylinie',
+      x: pagePoint.x,
+      y: pagePoint.y,
+      props: {
+        points: pointsRecord,
+        label: '',
+      },
+    })
+  }
+
+  override onPointerMove: TLEventHandlers['onPointerMove'] = () => {
+    this._updatePreview()
+  }
+
+  override onPointerDown: TLEventHandlers['onPointerDown'] = () => {
+    // Den Vorschau-Punkt finalisieren
+    const preview = this.points[this.points.length - 1]
+    if (!preview || preview.id !== 'preview') return
+
+    const snappedPos = this._getSnappedPosition()
+
+    // Vorschau-Punkt wird zum festen Punkt
+    const fixedId = `p${this.points.length - 1}`
+    const fixedPoint: PolyliniePoint = {
+      id: fixedId,
+      index: preview.index,
+      x: snappedPos.x,
+      y: snappedPos.y,
+    }
+
+    // Neuen Vorschau-Punkt erstellen
+    const newPreview: PolyliniePoint = {
+      id: 'preview',
+      index: this.nextIndex,
+      x: snappedPos.x,
+      y: snappedPos.y,
+    }
+    this.nextIndex = getIndexAbove(this.nextIndex)
+
+    // points-Array aktualisieren: Vorschau ersetzen + neuen Vorschau anhängen
+    this.points[this.points.length - 1] = fixedPoint
+    this.points.push(newPreview)
+
+    this._syncToShape()
+  }
+
+  override onDoubleClick: TLEventHandlers['onDoubleClick'] = () => {
+    // Vorschau-Punkt entfernen
+    if (this.points.length > 0 && this.points[this.points.length - 1].id === 'preview') {
+      this.points.pop()
+    }
+    // Den letzten durch Doppelklick platzierten Punkt auch entfernen
+    // (der erste Klick des Doppelklicks hat bereits einen Punkt gesetzt)
+    // Mindestens 2 Punkte behalten
+    if (this.points.length < 2) {
+      // Zu wenig Punkte → Shape löschen
+      this.editor.deleteShape(this.shapeId)
+    } else {
+      this._syncToShape()
+      this._tryConnectToShape()
+    }
+
+    this._finish()
+  }
+
+  override onCancel: TLEventHandlers['onCancel'] = () => {
+    this.editor.deleteShape(this.shapeId)
+    this._finish()
+  }
+
+  override onKeyDown: TLEventHandlers['onKeyDown'] = (info) => {
+    if (info.key === 'Escape') {
+      this.onCancel({} as never)
+    }
+  }
+
+  /** Aktuelle Mausposition mit Snapping (ab 3. Punkt). */
+  private _getSnappedPosition(): Vec2 {
+    const pagePoint = this.editor.inputs.currentPagePoint
+    const shape = this.editor.getShape(this.shapeId)
+    if (!shape) return { x: 0, y: 0 }
+
+    // In lokale Koordinaten umrechnen
+    const localX = pagePoint.x - shape.x
+    const localY = pagePoint.y - shape.y
+
+    const fixedPoints = this.points.filter((p) => p.id !== 'preview')
+    const pointCount = fixedPoints.length
+
+    // Erste 2 Punkte: freie Platzierung
+    if (pointCount < 2) {
+      return { x: localX, y: localY }
+    }
+
+    // Ab 3. Punkt: Winkel-Snapping
+    const prev = fixedPoints[pointCount - 1]
+    const prevPrev = fixedPoints[pointCount - 2]
+    return snapToAngleGrid(prev, prevPrev, { x: localX, y: localY })
+  }
+
+  /** Vorschau-Punkt an aktuelle Mausposition aktualisieren. */
+  private _updatePreview() {
+    const preview = this.points[this.points.length - 1]
+    if (!preview || preview.id !== 'preview') return
+
+    const snapped = this._getSnappedPosition()
+    preview.x = snapped.x
+    preview.y = snapped.y
+
+    this._syncToShape()
+  }
+
+  /** Points-Array in den Shape-Store schreiben. */
+  private _syncToShape() {
+    const pointsRecord: Record<string, PolyliniePoint> = {}
+    for (const p of this.points) {
+      pointsRecord[p.id] = p
+    }
+
+    this.editor.updateShape({
+      id: this.shapeId,
+      type: 'polylinie',
+      props: { points: pointsRecord },
+    })
+  }
+
+  /** Prüfen ob der Endpunkt auf einem Shape-Rand liegt und ggf. Binding erstellen. */
+  private _tryConnectToShape() {
+    const shape = this.editor.getShape(this.shapeId)
+    if (!shape || this.points.length < 2) return
+
+    const lastPoint = this.points[this.points.length - 1]
+    const worldX = shape.x + lastPoint.x
+    const worldY = shape.y + lastPoint.y
+
+    // Shapes am Endpunkt finden
+    const shapesAtPoint = this.editor.getShapesAtPoint({ x: worldX, y: worldY })
+    const connectable = shapesAtPoint.find(
+      (s) => ['puffer', 'kreisel', 'foerderer'].includes(s.type) && s.id !== this.shapeId
+    )
+
+    if (connectable) {
+      // Binding erstellen
+      this.editor.createBinding({
+        type: 'polylinie-connection',
+        fromId: this.shapeId,
+        toId: connectable.id,
+        props: {
+          terminal: 'end',
+          normalizedAnchor: { x: worldX, y: worldY },
+        },
+      })
+    }
+  }
+
+  /** Zeichnung beenden, zurück zum Idle-State. */
+  private _finish() {
+    document.querySelector('.tl-container')?.classList.remove('polylinie-active')
+    this.points = []
+    this.parent.transition('idle')
+  }
+}
diff --git a/client/src/tools/PolylinieIdle.ts b/client/src/tools/PolylinieIdle.ts
new file mode 100644
index 0000000..08dabef
--- /dev/null
+++ b/client/src/tools/PolylinieIdle.ts
@@ -0,0 +1,30 @@
+import { StateNode, TLEventHandlers } from 'tldraw'
+
+/** Idle-State: Wartet auf den ersten Klick zum Zeichnen. */
+export class PolylinieIdle extends StateNode {
+  static override id = 'idle'
+
+  override onEnter() {
+    this.editor.setCursor({ type: 'cross', rotation: 0 })
+    document.querySelector('.tl-container')?.classList.add('polylinie-active')
+  }
+
+  override onExit() {
+    // Hintergrund nur entfernen wenn wir nicht in den Drawing-State wechseln
+  }
+
+  override onPointerDown: TLEventHandlers['onPointerDown'] = () => {
+    this.parent.transition('drawing')
+  }
+
+  override onCancel: TLEventHandlers['onCancel'] = () => {
+    document.querySelector('.tl-container')?.classList.remove('polylinie-active')
+    this.editor.setCurrentTool('select')
+  }
+
+  override onKeyDown: TLEventHandlers['onKeyDown'] = (info) => {
+    if (info.key === 'Escape') {
+      this.onCancel({} as never)
+    }
+  }
+}
diff --git a/client/src/tools/PolylinieTool.ts b/client/src/tools/PolylinieTool.ts
new file mode 100644
index 0000000..54117ed
--- /dev/null
+++ b/client/src/tools/PolylinieTool.ts
@@ -0,0 +1,12 @@
+import { StateNode } from 'tldraw'
+import { PolylinieIdle } from './PolylinieIdle'
+import { PolylinieDrawing } from './PolylinieDrawing'
+
+/** Custom Tool zum Zeichnen von Polylinien. */
+export class PolylinieTool extends StateNode {
+  static override id = 'polylinie'
+  static override initial = 'idle'
+  static override children() {
+    return [PolylinieIdle, PolylinieDrawing]
+  }
+}
diff --git a/client/src/utils/angle-snap.ts b/client/src/utils/angle-snap.ts
new file mode 100644
index 0000000..5f39a51
--- /dev/null
+++ b/client/src/utils/angle-snap.ts
@@ -0,0 +1,56 @@
+import { POLYLINIE_CONFIG } from '../shapes/shape-config'
+
+export interface Vec2 {
+  x: number
+  y: number
+}
+
+/**
+ * Snapped einen Kandidatenpunkt auf das Winkelraster relativ zur vorherigen Segment-Richtung.
+ *
+ * - Wenn prevPrev null ist (erste 2 Segmente): freie Platzierung, kein Snapping.
+ * - Ab dem 3. Punkt: Snap auf [-90, -45, -22.5, 0, +22.5, +45, +90]° relativ zum vorherigen Segment.
+ */
+export function snapToAngleGrid(
+  prev: Vec2,
+  prevPrev: Vec2 | null,
+  candidate: Vec2,
+  snapAngles: number[] = POLYLINIE_CONFIG.snapAngles,
+): Vec2 {
+  if (!prevPrev) return candidate
+
+  // Richtung des vorherigen Segments
+  const prevDir = Math.atan2(prev.y - prevPrev.y, prev.x - prevPrev.x)
+
+  // Richtung zum Kandidaten
+  const candDir = Math.atan2(candidate.y - prev.y, candidate.x - prev.x)
+
+  // Relativer Winkel in Grad
+  let relDeg = ((candDir - prevDir) * 180) / Math.PI
+  // Normalisieren auf [-180, 180]
+  relDeg = ((relDeg + 180) % 360 + 360) % 360 - 180
+
+  // Nächsten Snap-Winkel finden
+  let bestSnap = snapAngles[0]
+  let bestDiff = Infinity
+  for (const snap of snapAngles) {
+    const diff = Math.abs(relDeg - snap)
+    if (diff < bestDiff) {
+      bestDiff = diff
+      bestSnap = snap
+    }
+  }
+
+  // Absolute Richtung nach Snap
+  const snappedAbsAngle = prevDir + (bestSnap * Math.PI) / 180
+
+  // Distanz vom prev zum Kandidaten beibehalten
+  const dist = Math.sqrt(
+    (candidate.x - prev.x) ** 2 + (candidate.y - prev.y) ** 2
+  )
+
+  return {
+    x: prev.x + Math.cos(snappedAbsAngle) * dist,
+    y: prev.y + Math.sin(snappedAbsAngle) * dist,
+  }
+}