game tries to make sure initial cave is not tiny

2 files changed, 50 insertions, 10 deletions

@@ -3,6 +3,8 @@
 #include <fov.h>
 #include <iostream>
 #include <fstream>
+#include <set>
+#include <deque>
 #include "util.h"
 #include "renderer.h"
 #include "consts.h"
@@ -14,20 +16,22 @@ Game::Game(std::mt19937& rng, Muxer& muxer, Renderer& renderer) :
 {
   losePopLampTimer.accumulate(losePopLampTimer.getDt());
 
-  loadMap();
-  tick();
-  tick();
-  tick();
+  do {
+    loadMap();
+    tick();
+    tick();
+    tick();
 
-  for (int y = -1; y <= 1; y++)
-  {
-    for (int x = -1; x <= 1; x++)
+    for (int y = -1; y <= 1; y++)
     {
-      map.tile(x,y) = Tile::Floor;
+      for (int x = -1; x <= 1; x++)
+      {
+        map.tile(x,y) = Tile::Floor;
+      }
     }
-  }
 
-  tick();
+    tick();
+  } while (!isInitialCaveBigEnough());
 
   std::ifstream textFile("../res/childoflight.txt");
   std::string line;
@@ -167,6 +171,40 @@ void Game::tick(bool onlyDark)
     onlyDark);
 }
 
+bool Game::isInitialCaveBigEnough() const {
+  std::set<coord> accessible;
+  std::deque<coord> search;
+  search.emplace_back(player_x, player_y);
+
+  auto check_fn = [&](int x, int y) {
+    coord potential = {x,y};
+    if (!accessible.count(potential) && !isTileSet(map, x, y)) {
+      accessible.insert(potential);
+      search.push_back(potential);
+    }
+  };
+
+  while (!search.empty()) {
+    auto [x,y] = search.front();
+    search.pop_front();
+
+    check_fn(x-1, y-1);
+    check_fn(x-1, y  );
+    check_fn(x-1, y+1);
+    check_fn(x  , y-1);
+    check_fn(x  , y+1);
+    check_fn(x+1, y-1);
+    check_fn(x+1, y  );
+    check_fn(x+1, y+1);
+
+    if (accessible.size() >= 200) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
 bool Game::movePlayer(int x, int y)
 {
   if (map.tile(x,y) == Tile::Floor && !map.at(x,y).sign)
@@ -126,6 +126,8 @@ private:
 
   void tick(bool onlyDark = false);
 
+  bool isInitialCaveBigEnough() const;
+
   bool movePlayer(int x, int y);
 
   void recalculateLighting();