Road|river patterns are trivial compared to terrain patterns - no need to use json, just define them as a constatnt

lib/mapping/CDrawRoadsOperation.cpp

@@ -11,6 +11,124 @@
 #include "StdInc.h"
 #include "CDrawRoadsOperation.h"
 
+const std::vector<CDrawRoadsOperation::RoadPattern> CDrawRoadsOperation::rules = 
+{
+	//single tile. fallback patern
+	{
+		{
+          "-","-","-",
+          "-","+","-",
+          "-","-","-"
+        },
+        {14,14},
+        {9,9},
+        false,
+        false
+	},
+	//Road straight with angle
+	{
+		{
+          "?","-","+",
+          "-","+","+",
+          "+","+","?" 
+        },
+        {2,5},
+        {-1,-1},
+        true,
+        true
+	},
+	//Turn
+	{
+		{
+          "?","-","?",
+          "-","+","+",
+          "?","+","?" 
+        },
+        {0,1},
+        {0,3},
+        true,
+        true
+	},
+	//Dead end horizontal
+	{
+		{
+          "?","-","?",
+          "-","+","+",
+          "?","-","?"   
+        },
+        {15,15},{11,12},
+        false,
+        true
+	},
+	//Dead end vertical
+	{
+		{
+          "?","-","?",
+          "-","+","-",
+          "?","+","?" 
+        },
+        {14,14},{9,10},
+        true,
+        false
+	},
+	//T-cross horizontal
+	{
+		{
+          "?","+","?",
+          "-","+","+",
+          "?","+","?"  
+        },
+        {6,7},{7,8},
+        false,
+        true
+	},
+	//T-cross vertical
+	{
+		{
+          "?","-","?",
+          "+","+","+",
+          "?","+","?" 
+        },
+        {8,9},{5,6},
+        true,
+        false
+	},
+	//Straight Horizontal 
+	{
+		{
+          "?","-","?",
+          "+","+","+",
+          "?","-","?"  
+        },
+        {12,13},{11,12},
+        false,
+        false
+	},
+	//Straight Vertical 
+	{
+		{
+          "?","+","?",
+          "-","+","-",
+          "?","+","?" 
+        },
+        {10,11},{9,10},
+        false,
+        false
+	},
+	//X-cross 
+	{
+		{
+          "?","+","?",
+          "+","+","+",
+          "?","+","?"  
+        },
+        {16,16},{4,4},
+        false,
+        false
+	}			
+	
+};
+
 ///CDrawRoadsOperation
 CDrawRoadsOperation::CDrawRoadsOperation(CMap * map, const CTerrainSelection & terrainSel, ERoadType::ERoadType roadType, CRandomGenerator * gen):
 	CMapOperation(map),terrainSel(terrainSel), roadType(roadType), gen(gen)

lib/mapping/CDrawRoadsOperation.h

@@ -24,6 +24,16 @@ public:
 	void redo() override;
 	std::string getLabel() const override;	
 private:
+	
+	struct RoadPattern
+	{
+		std::string rules[9];
+		std::pair<int, int> roadMapping, riverMapping;
+		bool hasHFlip, hasBFlip;
+	};
+	
+	static const  std::vector<RoadPattern> rules;
+	
 	CTerrainSelection terrainSel;
 	ERoadType::ERoadType roadType;
 	CRandomGenerator * gen;