Make it so the canvas for the map view is calculated based on the font size, which will allow for zooming.

gui.cpp

@@ -50,18 +50,30 @@ sf::Color GUI::color(Value val) {
   return VALUES[size_t(val)];
 }
 
-GUI::GUI() : $game_map(GAME_MAP_X, GAME_MAP_Y),
-  $canvas(VIEW_PORT_X * 2, VIEW_PORT_Y * 4),
+GUI::GUI() :
+  $game_map(GAME_MAP_X, GAME_MAP_Y),
   $window(sf::VideoMode(VIDEO_X,VIDEO_Y), "Roguish"),
   $screen(SCREEN_X, SCREEN_Y),
-  $map_screen(VIEW_PORT_X, VIEW_PORT_Y)
+  $map_screen(0,0)
 {
+  $font.loadFromFile("./assets/text.otf");
+  // calculate display size
+  sf::Glyph base_glyph = $font.getGlyph(L'█', MAP_FONT_SIZE, false);
+  auto bounds = base_glyph.bounds;
+  $view_port = {
+    size_t(std::ceil((VIDEO_X - GAME_MAP_POS) / bounds.width)),
+    size_t(std::ceil(VIDEO_Y / bounds.height))
+  };
+
+  // set canvas to best size
+  $canvas = Canvas($view_port.x * 2, $view_port.y * 4);
+
+  $map_screen = Screen($view_port.x, $view_port.y);
+
   int res = $hit_buf.loadFromFile("./assets/hit.wav");
   dbc::check(res, "failed to load hit.wav");
   $hit_sound.setBuffer($hit_buf);
 
-  $font.loadFromFile("./assets/text.otf");
-
   $ui_text.setFont($font);
   $ui_text.setPosition(0,0);
   $ui_text.setCharacterSize(UI_FONT_SIZE);
@@ -74,7 +86,7 @@ void GUI::create_renderer() {
   auto player = $world.get<Player>();
 
   $map_view = Renderer([&] {
-    System::draw_map($world, $game_map, $canvas, VIEW_PORT_X, VIEW_PORT_Y);
+    System::draw_map($world, $game_map, $canvas, $view_port.x, $view_port.y);
     return canvas($canvas);
   });
 

gui.hpp

@@ -17,16 +17,14 @@
 using std::string;
 using ftxui::Canvas, ftxui::Component, ftxui::Screen;
 
-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_X = 90;
+constexpr int GAME_MAP_Y = 90;
 constexpr int GAME_MAP_POS = 600;
 constexpr int SCREEN_X = 40;
 constexpr int SCREEN_Y = 30;
 constexpr int VIDEO_X = 1600;
 constexpr int VIDEO_Y = 900;
-constexpr int MAP_FONT_SIZE=60;
+constexpr int MAP_FONT_SIZE=90;
 constexpr int UI_FONT_SIZE=30;
 
 enum class Value {
@@ -52,6 +50,7 @@ class GUI {
   DinkyECS::World $world;
   sf::Texture $font_texture;
   std::unordered_map<wchar_t, sf::Sprite> $sprites;
+  Point $view_port = {0,0};
 
 public:
   GUI();

systems.cpp

@@ -25,14 +25,18 @@ void System::enemy_pathing(DinkyECS::World &world, Map &game_map, Player &player
 
 void System::motion(DinkyECS::World &world, Map &game_map) {
   world.system<Position, Motion>([&](const auto &ent, auto &position, auto &motion) {
-    Point move_to = {
-      position.location.x + motion.dx,
-      position.location.y + motion.dy
-    };
-    motion = {0,0}; // clear it after getting it
+    // don't process entities that don't move
+    if(motion.dx != 0 || motion.dy != 0) {
+      Point move_to = {
+        position.location.x + motion.dx,
+        position.location.y + motion.dy
+      };
+      motion = {0,0}; // clear it after getting it
 
-    if(game_map.inmap(move_to.x, move_to.y) && !game_map.iswall(move_to.x,move_to.y)) {
-      position.location = move_to;
+      // avoid colision, but could this be a different system?
+      if(game_map.inmap(move_to.x, move_to.y) && !game_map.iswall(move_to.x,move_to.y)) {
+        position.location = move_to;
+      }
     }
   });
 }