Implement player movement

src/Game.cpp

@@ -1,15 +1,44 @@
+#include <thread>
 #include "GameRenderer.hpp"
 #include "Player.hpp"
 #include "Game.hpp"
 
-#include <iostream>
+using namespace std::literals::chrono_literals;
 
 Game::Game() : renderer("Zombo Shooter", 800, 450), player(&renderer), map(&renderer, 40) {}
 
-Game::~Game() = default;
+Game::~Game()
+{
+    stopping = true;
+    update_thread.join();
+}
+
+void Game::update()
+{
+    while (!stopping) {
+        player.update();
+
+        renderer.redraw();
+
+        std::this_thread::sleep_for(16666us);
+    }
+}
+
+void Game::draw() const
+{
+    renderer.clear_screen(0x80, 0x40, 0xFF, 0xFF);
+
+    map.draw(player.x, player.y);
+
+    player.draw();
+
+    renderer.flush();
+}
 
 void Game::run()
 {
+    update_thread = std::thread(&Game::update, this);
+
     while (true) {
         SDL_Event e;
         SDL_WaitEvent(&e);
@@ -22,21 +51,40 @@ void Game::run()
             switch (e.key.keysym.sym) {
                 case SDLK_RIGHT:
                 case SDLK_d:
-                    player.x_vel = 5;
+                    player.x_vel = player.speed;
+                    break;
                 case SDLK_LEFT:
                 case SDLK_a:
-                    player.x_vel = -5;
+                    player.x_vel = -player.speed;
+                    break;
+                case SDLK_DOWN:
+                case SDLK_s:
+                    player.y_vel = player.speed;
+                    break;
+                case SDLK_UP:
+                case SDLK_w:
+                    player.y_vel = -player.speed;
+                    break;
             }
         }
 
-        player.update();
+        if (e.type == SDL_KEYUP) {
+            switch (e.key.keysym.sym) {
+                case SDLK_RIGHT:
+                case SDLK_d:
+                case SDLK_LEFT:
+                case SDLK_a:
+                    player.x_vel = 0;
+                    break;
+                case SDLK_DOWN:
+                case SDLK_s:
+                case SDLK_UP:
+                case SDLK_w:
+                    player.y_vel = 0;
+                    break;
+            }
+        }
 
-        renderer.clear_screen(0x80, 0x40, 0xFF, 0xFF);
+        draw();
-
-        map.draw(player.x, player.y);
-
-        player.draw();
-
-        renderer.flush();
     }
 }

src/Game.hpp

@@ -1,6 +1,7 @@
 #ifndef GAME_HPP
 #define GAME_HPP
 
+#include <thread>
 #include "GameRenderer.hpp"
 #include "Player.hpp"
 #include "Map.hpp"
@@ -12,12 +13,19 @@ private:
     Player player;
     Map map;
 
+    std::thread update_thread;
+    bool stopping = false;
+
+    void update();
+
 public:
     Game();
 
     ~Game();
 
     void run();
+
+    void draw() const;
 };
 
 #endif

src/GameRenderer.cpp

@@ -64,3 +64,12 @@ void GameRenderer::flush() const
 {
 	SDL_RenderPresent(renderer);
 }
+
+void GameRenderer::redraw() const
+{
+	SDL_Event event;
+	event.type = SDL_WINDOWEVENT;
+	event.window.event = SDL_WINDOWEVENT_EXPOSED;
+	event.window.windowID = SDL_GetWindowID(window);
+	SDL_PushEvent(&event);
+}

src/GameRenderer.hpp

@@ -28,6 +28,8 @@ public:
     void clear_screen(int r, int g, int b, int a) const;
 
     void flush() const;
+
+    void redraw() const;
 };
 
 #endif

src/Map.cpp

@@ -1,5 +1,4 @@
 #include <vector>
-#include <iostream>
 #include "Map.hpp"
 
 Map::Map(GameRenderer *renderer, int tile_size) :
@@ -27,8 +26,8 @@ void Map::draw(int player_x, int player_y) const
 {
     for (int tile_x = 0; tile_x < tiles.size(); tile_x++) {
         for (int tile_y = 0; tile_y < tiles[tile_x].size(); tile_y++) {
-            int screen_x = player_x + tile_x * tile_size + tile_offset_x * tile_size + renderer->screen_width / 2;
+            int screen_x = tile_x * tile_size + tile_offset_x * tile_size + renderer->screen_width / 2 - player_x;
-            int screen_y = player_y + tile_y * tile_size + tile_offset_y * tile_size + renderer->screen_height / 2;
+            int screen_y = tile_y * tile_size + tile_offset_y * tile_size + renderer->screen_height / 2 - player_y;
 
             if (
                 screen_x < -tile_size || screen_y < -tile_size ||

src/Player.hpp

@@ -10,11 +10,13 @@ private:
     Sprite hero_sprite;
 
 public:
-    int x = 0;
+    double x = 0;
-    int y = 0;
+    double y = 0;
 
-    int x_vel = 0;
+    double x_vel = 0;
-    int y_vel = 0;
+    double y_vel = 0;
+
+    const double speed = 0.9;
 
     Player(GameRenderer *renderer);