start screen working

CMakeLists.txt

@@ -11,7 +11,7 @@ find_package(SDL2 REQUIRED)
 include_directories(${SDL2_INCLUDE_DIRS})
 
 # SDL2 Gfx
-find_library(SDL2_GFX_LIBRARY NAMES SDL2_gfx SDL2_gfxd)
+find_library(SDL2_GFX_LIBRARY NAMES SDL2_gfx SDL2_gfxd libSDL2_gfx)
 if (NOT SDL2_GFX_LIBRARY)
     message(FATAL_ERROR "SDL2_gfx not found")
 endif ()
@@ -34,7 +34,8 @@ add_executable(Pong src/main.cpp
         src/VisibleObjects/Side.h
         src/VisibleObjects/Score.h
         src/TextScreen.h
-        src/defaultfont.h)
+        src/defaultfont.h
+        src/StartScreen.h)
 
 # Now link the libraries to the target
 target_link_libraries(Pong ${SDL2_LIBRARIES} ${SDL2_GFX_LIBRARY} ${SDL2_TTF_LIBRARY})

src/Game.h

@@ -10,6 +10,7 @@
 #include "VisibleObjects/PlayerPaddle.h"
 #include "VisibleObjects/Score.h"
 #include "TextScreen.h"
+#include "StartScreen.h"
 
 enum class GameState {
     START_SCREEN, GAME, END_SCREEN
@@ -20,7 +21,8 @@ private:
     Ball *ball;
     Score *score;
     PlayerPaddle *leftPaddle, *rightPaddle;
-    TextScreen *startScreen, *endScreen;
+    StartScreen *startScreen;
+    TextScreen *endScreen;
 
 protected:
     GameState gameState;
@@ -37,7 +39,7 @@ public:
         };
         score = new Score(5, &this->screenSize, func);
         ball = new Ball(&this->screenSize, leftPaddle, rightPaddle, score);
-        startScreen = new TextScreen("Welcome to Pong!\nPress any key to get started...", &this->screenSize);
+        startScreen = new StartScreen(&this->screenSize, 4);
         endScreen = new TextScreen("", &this->screenSize);
         gameState = GameState::START_SCREEN;
     }
@@ -76,6 +78,8 @@ public:
         switch (gameState) {
             case GameState::START_SCREEN:
                 startScreen->update();
+                if (startScreen->isDone())
+                    gameState = GameState::GAME;
                 break;
             case GameState::GAME:
                 ball->update();
@@ -97,8 +101,9 @@ public:
 
             switch (gameState) {
                 case GameState::START_SCREEN:
-                    if (event.type == SDL_KEYDOWN)
+                    if (event.type == SDL_KEYDOWN && !startScreen->hasStartedCounting())
-                        gameState = GameState::GAME;
+                        startScreen->startCountDown();
+
                     return true;
                 case GameState::GAME:
                     handleGameEvent(event);

src/StartScreen.h

@@ -0,0 +1,64 @@
+//
+// Created by Love on 2024-01-29.
+//
+
+#pragma once
+
+#include "TextScreen.h"
+#include "chrono"
+
+int_least64_t getCurrentEpochTimeMillis() {
+    auto now = std::chrono::system_clock::now();
+    auto now_ms = std::chrono::time_point_cast<std::chrono::milliseconds>(now);
+    auto epoch = now_ms.time_since_epoch();
+    auto value = std::chrono::duration_cast<std::chrono::milliseconds>(epoch);
+    return value.count();
+}
+
+
+class StartScreen : public TextScreen {
+private:
+    bool hasStartedCounting_ = false;
+    int_least64_t nextMsEpoch = 0;
+    int stepsToDo, stepsDone = 0;
+    bool isDone_ = false;
+public:
+    [[nodiscard]] const bool &isDone() const {
+        return isDone_;
+    }
+
+    [[nodiscard]] const bool &hasStartedCounting() const {
+        return hasStartedCounting_;
+    }
+
+public:
+    StartScreen(SDL_Point *screenSize, int seconds)
+            : TextScreen("Welcome to Pong!\nPress any key to get started...", screenSize), stepsToDo(seconds) {
+    }
+
+    void update() override {
+        auto now = getCurrentEpochTimeMillis();
+        if (hasStartedCounting_ && nextMsEpoch <= now) {
+            if (stepsDone < stepsToDo) {
+                std::string s = std::to_string(stepsToDo - stepsDone);
+                setText(s);
+                nextMsEpoch = now + 1000;
+                hasUpdated = false;
+                stepsDone++;
+            } else {
+                isDone_ = true;
+            }
+        }
+
+        TextScreen::update();
+    }
+
+    void startCountDown() {
+        auto epochMs = getCurrentEpochTimeMillis();
+        nextMsEpoch = epochMs + 1000;
+        hasStartedCounting_ = true;
+        stepsDone = 0;
+    }
+
+};
+

src/TextScreen.h

@@ -16,7 +16,7 @@ class TextScreen {
 private:
     std::vector<std::string> lines;
     TTF_Font *font;
-    bool hasUpdated;
+    SDL_Point *screenSize;
 
     // Regular
     std::vector<SDL_Rect> positions;
@@ -29,13 +29,16 @@ private:
     std::vector<SDL_Surface *> shadowSurfaces;
     const int shadowOffset = 3;
 
+protected:
+    bool hasUpdated;
+
 public:
     /**
      *
      * @param text This class takes care of freeing text
      * @param screenSize This won't be freed by this class
      */
-    TextScreen(const std::string& text, SDL_Point *screenSize) : hasUpdated(false) {
+    TextScreen(const std::string &text, SDL_Point *screenSize) : hasUpdated(false), screenSize(screenSize) {
         if (defaultFontPath == nullptr) {
             std::cerr << "Font path is not set for this platform (null)" << std::endl;
             exit(-1);
@@ -46,7 +49,17 @@ public:
             exit(-1);
         }
 
+        initPositions(text);
+    }
+
+private:
+    void initPositions(const std::string &text) {
         lines = splitString(text, '\n');
+        surfaces.clear();
+        shadowSurfaces.clear();
+        positions.clear();
+        shadowPositions.clear();
+
         surfaces.reserve(lines.size());
         shadowSurfaces.reserve(lines.size());
         positions.reserve(lines.size());
@@ -67,9 +80,9 @@ public:
             positions.push_back(regularPosition);
             shadowPositions.push_back(shadowPosition);
         }
-
     }
 
+public:
     ~TextScreen() {
         if (font)
             TTF_CloseFont(font);
@@ -80,7 +93,7 @@ public:
     }
 
 
-    void draw(SDL_Renderer *renderer) {
+    virtual void draw(SDL_Renderer *renderer) {
         for (int i = 0; i < surfaces.size(); ++i) {
             // Draw shadow
             SDL_Texture *shadowTexture = SDL_CreateTextureFromSurface(renderer, shadowSurfaces[i]);
@@ -98,8 +111,9 @@ public:
         }
     }
 
-    void setText(std::string &replaceText) {
+    void setText(const std::string &replaceText) {
         lines = splitString(replaceText, '\n');
+        initPositions(replaceText);
     }
 
     void replaceCharAtIndex(char c, int line, int index) {
@@ -118,7 +132,7 @@ public:
         lines[line][index] = c;
     }
 
-    void update() {
+    virtual void update() {
         if (hasUpdated)
             return;