(main)+colouring for differing sandpile proportions

Based on Wikipedia page colouring.

main.c

@@ -61,8 +61,19 @@ int main(void)
     for (size_t i = 0; i < state.dwidth; ++i)
       for (size_t j = 0; j < state.dwidth; ++j)
       {
+        Color c                = {0};
+        unsigned char sandpile = state.data[(i * state.dwidth) + j];
+        if (sandpile == 0)
+          c = BLACK;
+        else if (sandpile == 1)
+          c = GREEN;
+        else if (sandpile == 2)
+          c = PURPLE;
+        else if (sandpile == 3)
+          c = YELLOW;
+
         DrawRectangle(i * state.multiplier, j * state.multiplier,
-                      state.multiplier, state.multiplier, BLACK);
+                      state.multiplier, state.multiplier, c);
       }
     EndDrawing();
   }