units

terrain.h

@@ -20,9 +20,39 @@
 
 #define PI 3.14159265359f
 
-struct TerrainPoint {
-    char height;
+#include <QVector2D>
 
+struct TerrainPoint {
+    unsigned char height;
+    unsigned char type;
+    unsigned char river;
 };
 
+// Returns the 6 edge midpoints in local tile coordinates (radius = 0.5)
+inline QVector2D getHexEdgeMidpoint(int edge) {
+    static const QVector2D midpoints[6] = {
+        QVector2D(-0.375f,  0.21650635f), // Edge 0 (Top-Left)
+        QVector2D( 0.0f,    0.43301270f), // Edge 1 (Top)
+        QVector2D( 0.375f,  0.21650635f), // Edge 2 (Top-Right)
+        QVector2D( 0.375f, -0.21650635f), // Edge 3 (Bottom-Right)
+        QVector2D( 0.0f,   -0.43301270f), // Edge 4 (Bottom)
+        QVector2D(-0.375f, -0.21650635f)  // Edge 5 (Bottom-Left)
+    };
+    return midpoints[(edge % 6 + 6) % 6];
+}
+
+// Returns the coordinates of the neighbor tile sharing the given edge
+inline void getHexNeighbor(int x, int y, int edge, int &nx, int &ny) {
+    bool even = (x % 2 == 0);
+    switch ((edge % 6 + 6) % 6) {
+        case 0: nx = x - 1; ny = even ? y : y + 1;     break;
+        case 1: nx = x;     ny = y + 1;                break;
+        case 2: nx = x + 1; ny = even ? y : y + 1;     break;
+        case 3: nx = x + 1; ny = even ? y - 1 : y;     break;
+        case 4: nx = x;     ny = y - 1;                break;
+        case 5: nx = x - 1; ny = even ? y - 1 : y;     break;
+        default: nx = x; ny = y; break;
+    }
+}
+
 #endif // TERRAIN_H