ce95930b87
Coastline analysis and fix: - Coastlines now only show 2-edge patterns (straight, wide curve, sharp bend) — Y-junctions and crossroads removed since a coast always divides exactly two sides - Added waterSide property to HexFeature (1=CW, -1=CCW) — stored explicitly instead of computed by broken center-distance heuristic that flipped water/land at rotation midpoint - F key or "Flip water side" button in palette to toggle which side is water before placing - Inspector shows flip button (swap arrows) for placed coastlines - Rotation preserves waterSide — no more land/water swaps - Separate pattern lists: GENERAL_PATTERNS for road/river, COASTLINE_PATTERNS for coastline (core/tile-patterns.ts) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
113 lines
2.6 KiB
TypeScript
113 lines
2.6 KiB
TypeScript
/**
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* Canonical tile patterns for linear features.
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* Each pattern has a base edge mask and can be rotated in 60° increments.
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* Coastlines only use 2-edge patterns and have an additional waterSide property.
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*/
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import type { EdgeMask } from './types.js';
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import { HexEdge } from './types.js';
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import { edgeMask, rotateMask } from './edge-connectivity.js';
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export interface TilePattern {
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id: string;
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name: string;
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baseMask: EdgeMask;
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/** Max distinct rotations (accounting for symmetry) */
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rotations: number;
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/** Number of connected edges */
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edgeCount: number;
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}
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/** General patterns for road/river (all edge counts) */
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export const GENERAL_PATTERNS: TilePattern[] = [
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{
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id: 'dead-end',
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name: 'Dead End',
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baseMask: edgeMask(HexEdge.E),
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rotations: 6,
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edgeCount: 1,
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},
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{
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id: 'straight',
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name: 'Straight',
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baseMask: edgeMask(HexEdge.E, HexEdge.W),
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rotations: 3,
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edgeCount: 2,
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},
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{
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id: 'gentle-curve',
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name: 'Wide Curve',
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baseMask: edgeMask(HexEdge.E, HexEdge.SW),
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rotations: 6,
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edgeCount: 2,
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},
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{
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id: 'sharp-bend',
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name: 'Sharp Bend',
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baseMask: edgeMask(HexEdge.E, HexEdge.SE),
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rotations: 6,
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edgeCount: 2,
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},
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{
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id: 'y-junction',
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name: 'Y Split',
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baseMask: edgeMask(HexEdge.NE, HexEdge.SE, HexEdge.W),
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rotations: 6,
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edgeCount: 3,
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},
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{
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id: 'y-junction-wide',
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name: 'Y Wide',
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baseMask: edgeMask(HexEdge.NE, HexEdge.SW, HexEdge.SE),
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rotations: 6,
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edgeCount: 3,
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},
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{
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id: 'crossroads',
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name: 'Cross',
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baseMask: edgeMask(HexEdge.NE, HexEdge.E, HexEdge.SW, HexEdge.W),
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rotations: 3,
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edgeCount: 4,
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},
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];
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/** Coastline patterns — only 2-edge (a coast is always a line from A to B) */
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export const COASTLINE_PATTERNS: TilePattern[] = [
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{
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id: 'straight',
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name: 'Straight',
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baseMask: edgeMask(HexEdge.E, HexEdge.W),
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rotations: 3,
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edgeCount: 2,
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},
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{
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id: 'gentle-curve',
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name: 'Wide Curve',
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baseMask: edgeMask(HexEdge.E, HexEdge.SW),
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rotations: 6,
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edgeCount: 2,
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},
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{
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id: 'sharp-bend',
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name: 'Sharp Bend',
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baseMask: edgeMask(HexEdge.E, HexEdge.SE),
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rotations: 6,
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edgeCount: 2,
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},
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];
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/**
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* Get the appropriate patterns for a terrain type.
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*/
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export function getPatternsForTerrain(terrainId: string): TilePattern[] {
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if (terrainId === 'coastline') return COASTLINE_PATTERNS;
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return GENERAL_PATTERNS;
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}
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/**
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* Rotate a mask by N steps (each step = 60° clockwise).
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*/
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export function rotatePattern(mask: EdgeMask, steps: number): EdgeMask {
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return rotateMask(mask, steps);
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}
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