A dirty first cut at a single random horiz/vert split for the BSP algorithm.

main.cpp

@@ -17,31 +17,21 @@
 #include "dbc.hpp"
 
 using std::string;
+using namespace fmt;
 using namespace std::chrono_literals;
 
-Matrix input = {
-  {1,1,1,1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1,1,1,1},
-  {1,1,1,0,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1,1,1,1},
-};
-
-Matrix walls = {
-  {1,1,1,1,1,1,1,1,1,1,1,1},
-  {1,0,0,0,0,1,1,0,0,0,0,1},
-  {1,0,0,0,0,0,0,0,0,1,0,1},
-  {1,0,0,0,0,1,1,0,0,1,0,1},
-  {1,1,1,1,1,1,1,1,1,1,1,1},
-};
-
 int main() {
   using namespace ftxui;
   std::string reset_position;
 
   auto c = Canvas(150, 100);
 
-  Map game_map = Map(input, walls, 1000);
+  Map game_map(50, 20);
+  game_map.generate();
+  Matrix &input_map = game_map.input_map();
+  Matrix &walls = game_map.walls();
+
+  input_map[10][10] = 0;
 
   auto map = Renderer([&] {
     game_map.make_paths();
@@ -49,15 +39,21 @@ int main() {
 
     for(size_t x = 0; x < result[0].size(); ++x) {
       for(size_t y = 0; y < result.size(); ++y) {
-        auto val = result[y][x];
-        const string tile = val == 1000 ? "#" : fmt::format("{}", result[y][x]);
-
-
-        c.DrawText(x*2, y*4, tile);
+        auto path = result[y][x];
+        if(path == 1000) {
+          // it's a wall or unreachable, use the wall_map
+          const string tile = walls[y][x] == 1 ? "#" : ".";
+          c.DrawText(x*2, y*4, tile);
+        } else {
+          // it's a path number, show it
+          const string tile = format("{}", path);
+          c.DrawText(x*2, y*4, tile);
+        }
       }
     }
 
-    c.DrawText(4*2, 3*4, "@", Color::Blue);
+    // draw the character
+    c.DrawText(10*2, 10*4, "@", Color::Blue);
 
     return canvas(c) | border;
   });

map.cpp

@@ -1,6 +1,8 @@
 #include "map.hpp"
+#include "dbc.hpp"
 #include <vector>
 #include <fmt/core.h>
+#include <random>
 
 using std::vector, std::pair;
 using namespace fmt;
@@ -86,20 +88,72 @@ void Map::make_paths() {
   m_paths = new_arr;
 }
 
-void Map::make_room(size_t origin_x, size_t origin_y, size_t width, size_t height) {
-  for(size_t y = origin_y; y < origin_y + height; ++y) {
-    for(size_t x = origin_x; x < origin_x + width; ++x) {
+void Map::make_room(size_t origin_x, size_t origin_y, size_t w, size_t h) {
+  dbc::check(origin_x < width(), "x out of bounds");
+  dbc::check(origin_y < height(), "x out of bounds");
+  dbc::check(w < width(), "x out of bounds");
+  dbc::check(h < height(), "x out of bounds");
+
+  for(size_t y = origin_y; y < origin_y + h; ++y) {
+    for(size_t x = origin_x; x < origin_x + w; ++x) {
       m_walls[y][x] = 0;
     }
   }
 }
 
-void Map::generate() {
-  size_t w = width();
-  size_t h = height();
-
-  size_t half_w = w / 2;
-  size_t half_h = h / 2;
+struct Partition;
+
+struct Partition {
+  size_t x = 0;
+  size_t y = 0;
+  size_t width = 0;
+  size_t height = 0;
+
+  std::vector<Partition> children;
+};
+
+inline int make_split(std::mt19937 &gen, Partition &cur, bool horiz) {
+  if(horiz) {
+    size_t quarter = cur.height / 4;
+    // vertical split, pick a random horizontal location
+    std::uniform_int_distribution<int> rhoriz(cur.y + quarter, cur.height - quarter);
+    return rhoriz(gen);
+  } else {
+    size_t quarter = cur.width / 4;
+    // horizontal split, pick a random vertical location
+    std::uniform_int_distribution<int> rvert(cur.x + quarter, cur.width - quarter);
+    return rvert(gen);
+  }
+}
 
-  make_room(half_w - 5, half_h - 5, 5, 5);
+void Map::generate() {
+  std::random_device rd;
+  std::mt19937 gen(rd());
+  std::uniform_int_distribution<int> rsplit(0, 1);
+
+  Partition root{
+    .x = 1,
+    .y = 1,
+    .width = width() - 2,
+    .height = height() - 2
+  };
+
+  Partition &cur = root;
+  bool horiz = rsplit(gen);
+
+  for(int i = 0; i < 1; i++) {
+    int split = make_split(gen, cur, horiz);
+
+    if(horiz) {
+      println("HORIZ split={}, x={}, y={}, w={}, h={}", split, cur.x, cur.y, cur.width, cur.height);
+
+      make_room(cur.x, cur.y, cur.width, split - 1);
+      make_room(cur.x, cur.y + split, cur.width, cur.height - split);
+    } else {
+      println("VERT split={}, x={}, y={}, w={}, h={}", split, cur.x, cur.y, cur.width, cur.height);
+      make_room(cur.x, cur.y, split-1, cur.height);
+      make_room(cur.x + split, cur.y, cur.width - split, cur.height);
+    }
+    horiz = !horiz;
+  }
 }

tests/map.cpp

@@ -36,7 +36,7 @@ TEST_CASE("dijkstra algo test", "[map]") {
 }
 
 TEST_CASE("bsp algo test", "[map]") {
-  Map map(20, 20);
+  Map map(50, 20);
 
   map.generate();
   map.dump();