Class BorderCurveExtractor

Namespace

Map.Rendering

Assembly

MapAssembly.dll

Extracts smooth border curves from bitmap province boundaries Uses AdjacencySystem to process only known neighbor pairs (efficient) Pre-computes all curves at map load for zero-cost runtime updates

Architecture: Static Geometry + Dynamic Appearance Pattern

• Geometry (curves) computed once and cached
• Appearance (colors, thickness) updated at runtime via flags

REFACTORED: Now uses specialized helper classes for single responsibility

• BorderPolylineSimplifier: RDP simplification, Chaikin smoothing, tessellation
• BorderGeometryUtils: Geometric utilities (intersection, angles, distances)
• BorderChainMerger: Chain merging with U-turn detection
• JunctionDetector: Junction detection and endpoint snapping
• MedianFilterProcessor: Median filtering and pixel chaining

public class BorderCurveExtractor

Inheritance

object

BorderCurveExtractor

Constructors

BorderCurveExtractor(MapTextureManager, AdjacencySystem, ProvinceSystem, ProvinceMapping)

public BorderCurveExtractor(MapTextureManager textures, AdjacencySystem adjacency, ProvinceSystem provinces, ProvinceMapping mapping)

Parameters

textures MapTextureManager

adjacency AdjacencySystem

provinces ProvinceSystem

mapping ProvinceMapping

Methods

ExtractAllBorders()

Extract and smooth all province borders using Chaikin algorithm Returns dictionary of border polylines: (provinceA, provinceB) -> smooth polyline points

public Dictionary<(ushort, ushort), List<Vector2>> ExtractAllBorders()

Returns

Dictionary<(ushort, ushort), List<Vector2>>

ExtractAllBordersFromGPUResult(Dictionary<(ushort, ushort), List<Vector2>>, Dictionary<Vector2, int>)

Fast path: Build smoothed border polylines from pre-extracted GPU data. Skips median filter, junction detection, and border pixel extraction (all done on GPU). Only performs CPU-side chaining, simplification, smoothing, and tessellation.

public Dictionary<(ushort, ushort), List<Vector2>> ExtractAllBordersFromGPUResult(Dictionary<(ushort, ushort), List<Vector2>> borderPixelsByPair, Dictionary<Vector2, int> gpuJunctions)

Parameters

borderPixelsByPair Dictionary<(ushort, ushort), List<Vector2>>

gpuJunctions Dictionary<Vector2, int>

Returns

Dictionary<(ushort, ushort), List<Vector2>>