Systems now control most of the game's operations and a lot of the rendering logic, this now brings in a camera so maps can be larger than the viewport.

gui.cpp

@@ -49,10 +49,10 @@ sf::Color GUI::color(Value val) {
 }
 
 GUI::GUI() : $game_map(GAME_MAP_X, GAME_MAP_Y),
-  $canvas(GAME_MAP_X * 2, GAME_MAP_Y * 4),
+  $canvas(VIEW_PORT_X * 2, VIEW_PORT_Y * 4),
   $window(sf::VideoMode(VIDEO_X,VIDEO_Y), "Roguish"),
   $screen(SCREEN_X, SCREEN_Y),
-  $map_screen(GAME_MAP_X, GAME_MAP_Y)
+  $map_screen(VIEW_PORT_X, VIEW_PORT_Y)
 {
   int res = $hit_buf.loadFromFile("./assets/hit.wav");
   dbc::check(res, "failed to load hit.wav");
@@ -77,27 +77,7 @@ void GUI::create_renderer() {
   auto player = $world.get<Player>();
 
   $map_view = Renderer([&, player] {
-    const auto& player_position = $world.component<Position>(player.entity);
-    Matrix &walls = $game_map.walls();
-    $game_map.set_target(player_position.location);
-    $game_map.make_paths();
-    Matrix &paths = $game_map.paths();
-
-    for(size_t x = 0; x < walls[0].size(); ++x) {
-      for(size_t y = 0; y < walls.size(); ++y) {
-        string tile = walls[y][x] == 1 ? WALL_TILE : format("{}", paths[y][x]);
-        if(tile == WALL_TILE) {
-          $canvas.DrawText(x*2, y*4, tile);
-        } else if($show_paths) {
-          //int pnum = paths[y][x];
-          $canvas.DrawText(x*2, y*4, tile);
-        } else {
-          $canvas.DrawText(x*2, y*4, FLOOR_TILE);
-        }
-      }
-    }
-
-    System::draw_entities($world, $canvas);
+    System::draw_map($world, $game_map, $canvas, VIEW_PORT_X, VIEW_PORT_Y);
     return canvas($canvas);
   });
 
@@ -118,13 +98,15 @@ void GUI::create_renderer() {
 
 void GUI::handle_events() {
   sf::Event event;
-  auto player = $world.get<Player>();
-  auto& player_motion = $world.component<Motion>(player.entity);
 
   while($window.pollEvent(event)) {
     if(event.type == sf::Event::Closed) {
       $window.close();
     } else if(event.type ==  sf::Event::KeyPressed) {
+      auto player = $world.get<Player>();
+      auto& player_motion = $world.component<Motion>(player.entity);
+      auto& player_position = $world.component<Position>(player.entity);
+
       if(sf::Keyboard::isKeyPressed(sf::Keyboard::Left)) {
         player_motion.dx = -1;
       } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Right)) {
@@ -135,6 +117,8 @@ void GUI::handle_events() {
         player_motion.dy = 1;
       }
 
+      $game_map.set_target(player_position.location);
+      $game_map.make_paths();
       // COMPOSE system? You create a bunch of callbacks and then combine them into
       // a single run over the data?
       System::enemy_pathing($world, $game_map, player);

gui.hpp

@@ -16,8 +16,10 @@
 using std::string;
 using ftxui::Canvas, ftxui::Component, ftxui::Screen;
 
-constexpr int GAME_MAP_X = 30;
-constexpr int GAME_MAP_Y = 15;
+constexpr int GAME_MAP_X = 60;
+constexpr int GAME_MAP_Y = 30;
+constexpr int VIEW_PORT_X = 30;
+constexpr int VIEW_PORT_Y = 15;
 constexpr int GAME_MAP_POS = 600;
 constexpr int SCREEN_X = 40;
 constexpr int SCREEN_Y = 30;
@@ -25,10 +27,6 @@ constexpr int VIDEO_X = 1600;
 constexpr int VIDEO_Y = 900;
 constexpr int MAP_FONT_SIZE=60;
 constexpr int UI_FONT_SIZE=30;
-#define WALL_TILE "█"
-#define FLOOR_TILE "·"
-#define PLAYER_TILE "☺"
-#define ENEMY_TILE "Ω"
 
 enum class Value {
   BLACK=0, DARK_DARK, DARK_MID,

map.hpp

@@ -3,12 +3,18 @@
 #include <utility>
 #include <string>
 #include <random>
+#include <algorithm>
+#include <fmt/core.h>
 
 #define INV_WALL 0
 #define INV_SPACE 1
-
 #define WALL_VALUE 1
 #define SPACE_VALUE 0
+#define WALL_TILE "█"
+#define FLOOR_TILE "·"
+#define PLAYER_TILE "☺"
+#define ENEMY_TILE "Ω"
+
 
 struct Point {
   size_t x = 0;
@@ -81,4 +87,14 @@ public:
   void set_door(Room &room, int value);
   void dump();
   Point place_entity(size_t room_index);
+
+  Point map_to_camera(const Point &loc, const Point &cam_orig) {
+    return {loc.x - cam_orig.x, loc.y - cam_orig.y};
+  }
+
+  Point center_camera(const Point &around, size_t view_x, size_t view_y) {
+    size_t start_x = std::clamp(int(around.x - view_x / 2), 0, int(width() - view_x));
+    size_t start_y = std::clamp(int(around.y - view_y / 2), 0, int(height() - view_y));
+    return {start_x, start_y};
+  }
 };

systems.cpp

@@ -1,4 +1,9 @@
 #include "systems.hpp"
+#include <fmt/core.h>
+#include <string>
+
+using std::string;
+using namespace fmt;
 
 void System::enemy_pathing(DinkyECS::World &world, Map &game_map, Player &player) {
   // move enemies system
@@ -38,9 +43,31 @@ void System::combat(DinkyECS::World &world, Player &player) {
   });
 };
 
-
-void System::draw_entities(DinkyECS::World &world, ftxui::Canvas &canvas) {
+void System::draw_entities(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canvas, const Point &cam_orig, size_t view_x, size_t view_y) {
   world.system<Position, Tile>([&](const auto &ent, auto &pos, auto &tile) {
-    canvas.DrawText(pos.location.x*2, pos.location.y*4, tile.chr);
+    if(pos.location.x >= cam_orig.x && pos.location.x <= cam_orig.x + view_x
+        && pos.location.y >= cam_orig.y && pos.location.y <= cam_orig.y + view_y) {
+      Point loc = game_map.map_to_camera(pos.location, cam_orig);
+      canvas.DrawText(loc.x*2, loc.y*4, tile.chr);
+    }
   });
 }
+
+void System::draw_map(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canvas, size_t view_x, size_t view_y) {
+  const auto& player = world.get<Player>();
+  const auto& player_position = world.component<Position>(player.entity);
+  Point start = game_map.center_camera(player_position.location, view_x, view_y);
+  Matrix &walls = game_map.walls();
+
+  size_t end_x = std::min(view_x, game_map.width() - start.x);
+  size_t end_y = std::min(view_y, game_map.height() - start.y);
+
+  for(size_t x = 0; x < end_x; ++x) {
+    for(size_t y = 0; y < end_y; ++y) {
+      string tile = walls[start.y+y][start.x+x] == 1 ? WALL_TILE : FLOOR_TILE;
+      canvas.DrawText(x * 2, y * 4, tile);
+    }
+  }
+
+  System::draw_entities(world, game_map, canvas, start, view_x, view_y);
+}

systems.hpp

@@ -7,6 +7,7 @@
 namespace System {
   void motion(DinkyECS::World &world, Map &game_map);
   void combat(DinkyECS::World &world, Player &player);
-  void draw_entities(DinkyECS::World &world, ftxui::Canvas &canvas);
   void enemy_pathing(DinkyECS::World &world, Map &game_map, Player &player);
+  void draw_map(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canvas, size_t view_x, size_t view_y);
+  void draw_entities(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canvas, const Point &cam_orig, size_t view_x, size_t view_y);
 }