wild tiles can heal

half-earth/resources/tiles/tile_types/wild.tres

@@ -8,4 +8,5 @@ Name = "Wild"
 Key = 87
 Color = Color( 0.14902, 1, 0, 0 )
 HeatGeneration = -0.02
+HealRate = 0.01
 Threshold = 0.6

half-earth/scripts/EnvironmentSystem.cs

@@ -45,13 +45,19 @@ public class EnvironmentSystem
             var tile = _tiles[i];
             var type = tile.type;
             tile.temperature += type.HeatGeneration;
-            ApplyHeatDamage(ref tile);
             _tiles[i] = tile;
         }
+
+        for (int i = 0; i < _tiles.Count; i++)
+        {
+            ApplyHeatDamage(i);
+        }
     }
 
-    private void ApplyHeatDamage(ref Tile tile)
+    private void ApplyHeatDamage(int i)
     {
+        _tiles.MapIndex(i, out var x, out var y);
+        var tile = _tiles[x, y];
         if (!(tile.type is IDamageable damageable))
             return;
 
@@ -59,46 +65,22 @@ public class EnvironmentSystem
         if (delta < 0)
         {
             // we want to heal based on how many wild tiles surround us
-            float healRate = 0.01f;
+            float wild = _tiles.GetNeighbourProportion<Wild>(x, y);
+            float heal = damageable.HealRate * wild;
 
-            // count neighbours
+            tile.currentHealth += heal;
         }
         else
         {
-            // take damage
             // TODO: parameterised balancing
+
+            // take damage
             tile.currentHealth -= delta;
+        }
+
         tile.currentHealth = Mathf.Clamp(tile.currentHealth, 0, 1);
-        }
 
-    }
-
-    public int GetNeighbourCount<T>(int x, int y) where T : TileType
-    {
-        int count = 0;
-
-        for (int i = -1; i < 1; i += 2)
-        {
-            for (int j = -1; j < 1; j += 2)
-            {
-                int xi = x + 1;
-                int yj = y + 1;
-
-                // assume tiles out side of bounds are the same type as this one
-                if (!_tiles.IsInBounds(xi, yj))
-                {
-                    count += 1;
-                    continue;
-                }
-
-                if (!(_tiles[xi, yj] is T))
-                    continue;
-
-                count++;
-            }
-        }
-
-        return count;
+        _tiles[x, y] = tile;
     }
 
     private void Diffuse()

half-earth/scripts/tile/IDamageable.cs

@@ -1,4 +1,5 @@
 public interface IDamageable
 {
+    float HealRate { get; }
     float Threshold { get; }
 }

half-earth/scripts/tile/TileGrid.cs

@@ -89,5 +89,64 @@ public class TileGrid : Resource, IReadOnlyList<Tile>
     {
         return x >= 0 && x < Size && y >= 0 && y < Size;
     }
+
+    private readonly int[] _neighbours = new int[]
+    {
+        -1, 0,
+        0, 1,
+        1, 0,
+        0, -1
+    };
+
+    private void GetCoordinate(int dir, out int x, out int y)
+    {
+        dir %= 4;
+        int idx = dir * 2;
+        x = _neighbours[idx];
+        y = _neighbours[idx + 1];
+    }
+
+    public float GetNeighbourProportion<T>(int x, int y)
+    {
+        int typed = GetNeighbourCount<T>(x, y);
+        int all = GetNeighbourCount(x, y);
+        return (float)typed / (float)all;
+    }
+
+    public int GetNeighbourCount<T>(int x, int y)
+    {
+        int count = 0;
+        for (int i = 0; i < 4; i++)
+        {
+            GetCoordinate(i, out var nx, out var ny);
+
+            if (!IsInBounds(x + nx, y + ny))
+                continue;
+
+            if (!(this[x + nx, y + ny].type is T))
+                continue;
+
+            count++;
+        }
+
+        return count;
+    }
+
+    public int GetNeighbourCount(int x, int y)
+    {
+        int count = 0;
+
+        for (int i = 0; i < 4; i++)
+        {
+            GetCoordinate(i, out var nx, out var ny);
+
+            if (!IsInBounds(x + nx, y + ny))
+                continue;
+
+            count++;
+        }
+
+        return count;
+    }
 }
 

half-earth/scripts/tile/Wild.cs

@@ -2,6 +2,9 @@ using Godot;
 
 public class Wild : TileType, IDamageable
 {
+    [Export]
+    public float HealRate { get; private set; } = 0.01f;
+
     [Export]
     public float Threshold { get; private set; }