task(CAD-2): real hatch patterns - 9 patterns (ANSI31/32/37, NET, GRASS, DOTS, SOLID + legacy), boundary detection, render adapter hatch lines

frontend/tests/hatchPatterns.test.ts

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+/**
+ * Task CAD-2 - Echte Hatch-Muster + Boundary-Erkennung.
+ *
+ * HATCH_PATTERNS: Standard-CAD-Muster (ANSI31, NET, GRASS etc.)
+ * als Linien-Segment-Generatoren fuer eine BBox.
+ * computeBoundary: umschlossene Flaeche aus Kontur-Punkten.
+ */
+import { describe, it, expect } from 'vitest';
+import {
+  HATCH_PATTERNS,
+  getHatchPattern,
+  generateHatchLines,
+  computeBoundary,
+  type HatchPatternId,
+} from '../src/services/hatchPatternService';
+
+describe('CAD-2: HATCH_PATTERNS Bibliothek', () => {
+  it('enthaelt die Standard-CAD-Muster', () => {
+    const ids = HATCH_PATTERNS.map((p) => p.id);
+    expect(ids).toContain('ANSI31');
+    expect(ids).toContain('ANSI32');
+    expect(ids).toContain('ANSI37');
+    expect(ids).toContain('NET');
+    expect(ids).toContain('GRASS');
+    expect(ids).toContain('DOTS');
+    expect(ids).toContain('SOLID');
+    expect(ids).toContain('lines'); // Alte bleiben erhalten
+    expect(ids).toContain('cross');
+  });
+
+  it('jedes Muster hat id, label, description; spacing nur bei Nicht-SOLID', () => {
+    for (const p of HATCH_PATTERNS) {
+      expect(p.id.length).toBeGreaterThan(0);
+      expect(p.label.length).toBeGreaterThan(0);
+      // SOLID braucht keinen Abstand (Vollfuellung)
+      if (!p.solid) {
+        expect(p.defaultSpacing).toBeGreaterThan(0);
+      }
+    }
+  });
+
+  it('getHatchPattern liefert undefined fuer unbekannte ID', () => {
+    expect(getHatchPattern('gibts-nicht')).toBeUndefined();
+    expect(getHatchPattern('ANSI31')).toBeDefined();
+    expect(getHatchPattern('ANSI31')!.label).toContain('1');
+  });
+});
+
+describe('CAD-2: generateHatchLines (Muster-Geometrie)', () => {
+  const bbox = { minX: 0, minY: 0, maxX: 100, maxY: 50 };
+  const spacing = 10;
+
+  it('ANSI31 (45 Grad): erzeugt Diagonal-Linien', () => {
+    const lines = generateHatchLines('ANSI31', bbox, spacing);
+    expect(lines.length).toBeGreaterThan(3);
+    for (const seg of lines) {
+      const dx = seg.to.x - seg.from.x;
+      const dy = seg.to.y - seg.from.y;
+      expect(Math.abs(dy / dx)).toBeCloseTo(1, 1); // 45 Grad
+    }
+  });
+
+  it('NET: erzeugt horizontale UND vertikale Linien', () => {
+    const lines = generateHatchLines('NET', bbox, spacing);
+    const horiz = lines.filter((l) => l.from.y === l.to.y);
+    const vert = lines.filter((l) => l.from.x === l.to.x);
+    expect(horiz.length).toBeGreaterThan(0);
+    expect(vert.length).toBeGreaterThan(0);
+  });
+
+  it('DOTS: erzeugt kleine Kreise (als 4-Punkt-Polygone)', () => {
+    const lines = generateHatchLines('DOTS', bbox, spacing);
+    expect(lines.length).toBeGreaterThan(0);
+    // DOTS sind als polyline-segments repraesentiert
+  });
+
+  it('SOLID: erzeugt EINE grosse Flaeche (fill)', () => {
+    const lines = generateHatchLines('SOLID', bbox, spacing);
+    expect(lines).toHaveLength(1);
+    expect((lines[0] as { fill?: string }).fill).toBeDefined();
+  });
+
+  it('unbekanntes Muster: leeres Array (renderer-sicher)', () => {
+    expect(generateHatchLines('gibts-nicht', bbox, spacing)).toEqual([]);
+  });
+});
+
+describe('CAD-2: computeBoundary (Boundary-Erkennung)', () => {
+  it('Rechteck-Kontur: BBox wird korrekt berechnet', () => {
+    const pts = [{ x: 0, y: 0 }, { x: 100, y: 0 }, { x: 100, y: 50 }, { x: 0, y: 50 }];
+    const b = computeBoundary(pts);
+    expect(b).toEqual({ minX: 0, minY: 0, maxX: 100, maxY: 50 });
+  });
+
+  it('Dreieck: BBox umschliesst alle Punkte', () => {
+    const pts = [{ x: 10, y: 0 }, { x: 90, y: 80 }, { x: 10, y: 80 }];
+    const b = computeBoundary(pts);
+    expect(b.minX).toBe(10);
+    expect(b.maxX).toBe(90);
+    expect(b.minY).toBe(0);
+    expect(b.maxY).toBe(80);
+  });
+
+  it('leere/wenige Punkte: null-Boundary', () => {
+    expect(computeBoundary([])).toBeNull();
+    expect(computeBoundary([{ x: 0, y: 0 }])).toBeNull();
+  });
+});