FlappyBird/main.cpp

/*
    FlappyBird
    Copyright (C) 2024  Patrick_Pluto

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <iostream>
#include <random>

bool sdlPipe ( SDL_Rect* pipeRect, SDL_Rect* birdRect, SDL_Renderer* renderer, SDL_Texture* flappyBird, SDL_Texture* pipe )
{
  // Render the pipes
  SDL_RenderCopy ( renderer, pipe, nullptr, pipeRect );

  // Draw pipes and check for collisions.

  if ( SDL_HasIntersection ( pipeRect, birdRect ) )
    {
      return true;
    }

  pipeRect->y += 1150 ; // move sprite for rendering the bottom pipe

  SDL_RenderCopyEx ( renderer, pipe, nullptr, pipeRect, 0.0, nullptr, SDL_FLIP_VERTICAL );

  pipeRect->x -= 2;

  if ( SDL_HasIntersection ( pipeRect, birdRect ) )
    {
      return true;
    }

  pipeRect->y -= 1150 ; // moving it back

  if ( pipeRect->x <= -50 )
    {
      std::random_device rd; // Obtain a random number from hardware
      std::mt19937 eng ( rd() ); // Seed the generator
      std::uniform_int_distribution<> distr ( -950, -650 ); // Define the range

      // Generate the random number
      pipeRect->y = distr ( eng );

      pipeRect->x = 800;
    }

  return false;
}

int main ( int argc, char* argv[] )
{
  // Initialize SDL
  if ( SDL_Init ( SDL_INIT_VIDEO ) < 0 )
    {
      std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
      return 1;
    }

  // Create a window
  SDL_Window* window = SDL_CreateWindow ( "Flappy Bird",
                                          SDL_WINDOWPOS_UNDEFINED,
                                          SDL_WINDOWPOS_UNDEFINED,
                                          800, 600,
                                          SDL_WINDOW_SHOWN );
  if ( window == nullptr )
    {
      std::cerr << "Window could not be created! SDL_Error: " << SDL_GetError() << std::endl;
      SDL_Quit();
      return 1;
    }

  // Create a renderer
  SDL_Renderer* renderer = SDL_CreateRenderer ( window, -1, SDL_RENDERER_ACCELERATED );
  if ( renderer == nullptr )
    {
      std::cerr << "Renderer could not be created! SDL_Error: " << SDL_GetError() << std::endl;
      SDL_DestroyWindow ( window );
      SDL_Quit();
      return 1;
    }

  // Load the sprite texture
  SDL_Texture* flappyBird = IMG_LoadTexture ( renderer, "bird.png" );
  if ( flappyBird == nullptr )
    {
      std::cerr << "Failed to load texture! SDL_Error: " << SDL_GetError() << std::endl;
      // Handle error
    }

  SDL_Texture* pipe = IMG_LoadTexture ( renderer, "pipe.png" );
  if ( pipe == nullptr )
    {
      std::cerr << "Failed to load texture! SDL_Error: " << SDL_GetError() << std::endl;
      // Handle error
    }

  // Sprite position and size
  SDL_Rect birdRect;
  birdRect.x = 300; // Initial x position
  birdRect.y = 200; // Initial y position
  birdRect.w = 48;  // Width of the sprite
  birdRect.h = 36;  // Height of the sprite

  // Create a random number generator
  std::random_device rd; // Obtain a random number from hardware
  std::mt19937 eng ( rd() ); // Seed the generator
  std::uniform_int_distribution<> distr ( -950, -650 ); // Define the range

  SDL_Rect pipe1Rect;
  pipe1Rect.x = 650;
  pipe1Rect.y = distr ( eng ) ;
  pipe1Rect.w = 64;
  pipe1Rect.h = 1024;

  SDL_Rect pipe2Rect;
  pipe2Rect.x = 850;
  pipe2Rect.y = distr ( eng ) ;
  pipe2Rect.w = 64;
  pipe2Rect.h = 1024;

  SDL_Rect pipe3Rect;
  pipe3Rect.x = 1050;
  pipe3Rect.y = distr ( eng ) ;
  pipe3Rect.w = 64;
  pipe3Rect.h = 1024;

  SDL_Rect pipe4Rect;
  pipe4Rect.x = 1250;
  pipe4Rect.y = distr ( eng ) ;
  pipe4Rect.w = 64;
  pipe4Rect.h = 1024;

  // Sprite Velocity
  double velocityY = 0;

  // Main loop flag
  bool quit = false;
  SDL_Event e;

  Uint32 frameStart;
  int frameTime;
  const int TARGET_FPS = 60;
  const int FRAME_DELAY = 1000 / TARGET_FPS; // Delay in milliseconds

  // Main loop
  while ( !quit )
    {
      frameStart = SDL_GetTicks();

      // Handle events
      while ( SDL_PollEvent ( &e ) != 0 )
        {
          // User requests quit
          if ( e.type == SDL_QUIT )
            {
              quit = true;
            }

          if ( e.type == SDL_KEYDOWN )
            {
              switch ( e.key.keysym.sym )
                {
                case SDLK_SPACE:  // Flap
                  velocityY = -5;
                  break;
                }
            }
        }

      velocityY += 0.25;
      birdRect.y += velocityY;

      // Clear the window with a color (e.g., white)
      SDL_SetRenderDrawColor ( renderer, 63, 63, 255, 255 ); // White color
      SDL_RenderClear ( renderer );

      // Set the color for the bottom part (green)
      SDL_SetRenderDrawColor ( renderer, 0, 255, 0, 255 ); // Green color

      // Define the rectangle for the bottom part of the screen
      SDL_Rect bottomRect;
      bottomRect.x = 0; // Start from the left edge
      bottomRect.y = 550; // Start from the vertical position (adjust as needed)
      bottomRect.w = 800; // Width of the screen (adjust based on your window size)
      bottomRect.h = 50; // Height of the green area (adjust as needed)

      // Render the green rectangle
      SDL_RenderFillRect ( renderer, &bottomRect );

      // Render the sprite
      SDL_RenderCopy ( renderer, flappyBird, nullptr, &birdRect );

      quit = sdlPipe ( &pipe1Rect, &birdRect, renderer, flappyBird, pipe );

      if (!quit) {
          quit = sdlPipe ( &pipe2Rect, &birdRect, renderer, flappyBird, pipe );
      }

      if (!quit) {
          quit = sdlPipe ( &pipe3Rect, &birdRect, renderer, flappyBird, pipe );
      }

      if (!quit) {
          quit = sdlPipe ( &pipe4Rect, &birdRect, renderer, flappyBird, pipe );
      }

      // Present the renderer
      SDL_RenderPresent ( renderer );

      frameTime = SDL_GetTicks() - frameStart;

      if ( frameTime < FRAME_DELAY )
        {
          SDL_Delay ( FRAME_DELAY - frameTime );
        }

      if ( SDL_HasIntersection ( &bottomRect, &birdRect ) )
        {
          quit = true;
        }
    }

  // Clean up
  SDL_DestroyTexture ( flappyBird );
  SDL_DestroyTexture ( pipe );
  SDL_DestroyRenderer ( renderer );
  SDL_DestroyWindow ( window );
  SDL_Quit();

  return 0;
}