Minesweeper done in main() using SDL2

I was having fun time challenging myself to do minesweeper game yesterday and today with SDL2 and having every piece of code in main(). Here is result.
(OK; There is no game over state or any actual play again programmed in. Just idea of minesweeper created)

Any feedback is appreciated

Goofy texture used: https://imgur.com/a/4VKLc

And; well code (use "-lSDL2" flag to compile on Linux. On Windows, dunno):

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#include <iostream>
#include <SDL2/SDL.h>
#include <cmath>
#include <ctime>
#include <vector>
#include <utility>

int main(int argc, char const *argv[]) {
  SDL_Window * window;
  SDL_Renderer * renderer;
  SDL_Surface * img; // Surface is used as temp place for bmp's
  SDL_Texture * tex; // Full tile sheet
  int w=32; // img and boad size
  int minesCount = 10;
  bool isRunning=true;
  srand(time(NULL));

  // Init SDL
  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
    std::cout << "We f'd up: " << SDL_GetError() << '\n';
    return -1;
  }

  // Create window ready to be drawn
  if (SDL_CreateWindowAndRenderer(320, 320,SDL_WINDOW_OPENGL, &window, &renderer)<0) {
    std::cout << "We did f again: " << SDL_GetError() << '\n';
    SDL_DestroyRenderer(renderer); // Just to be safe...
    SDL_DestroyWindow(window); // Just to be safe...
    SDL_Quit();
    return -2;
  }

  // LOAD TEXTURE
  // "Sheet" explained later
  img = SDL_LoadBMP("gfx.bmp");
  tex = SDL_CreateTextureFromSurface(renderer, img);
  SDL_FreeSurface(img); // Use img later if needed for more textures

  // Basic struct for nodes of tiles in display
  struct Tile {
    bool isMine;
    int n;  // Neighbors
    bool isRevealed=false;
  };

  // init board
  Tile board[10][10];
  for (int i = 0; i < 10; i++) {
    for (int j = 0; j < 10; j++) {
      board[i][j].isMine=false;
      board[i][j].n=0;
    }
  }

  // Fill board with minesCount of mines.
  int m=0;
  while(m<minesCount) {
    int x=rand()%10;
    int y=rand()%10;
    if (board[x][y].isMine)
    continue;
    board[x][y].isMine=true;
    m++;
  }

  // Calculate neighbors
  for (int i = 0; i < 10; i++) {
    for (int j = 0; j < 10; j++) {
      // If this is mine, skip it
      if (board[i][j].isMine) {
        board[i][j].n=9; // Choose correct texture from sheet tho
        continue;
      }
      int n=0;
      // Calculate all neighbors on 3x3 grid around tile
      for (int x = -1; x <= 1; x++) {
        for (int y = -1; y <= 1; y++) {
          int xoff=i+x;
          int yoff=j+y;
          // Do not count outside array
          if (xoff<0 || xoff>9 || yoff<0 || yoff>9)
            continue;
          if (board[xoff][yoff].isMine)
            n++;
        }
        // Update neighbor count to the struct
        board[i][j].n=n;
      }
    }
  }

  // Main loop
  while (isRunning) {
    // We want to use black background
    SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF);
    // Clear the screen with current background color
    SDL_RenderClear(renderer);

    // DO DRAW
    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
    for (int i = 0; i < 10; i++) {
      for (int j= 0; j < 10; j++) {
        // for showing grid at start
        SDL_Rect rect;
        rect.x=i*w;
        rect.y=j*w;
        rect.w=w;
        rect.h=w;
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
        SDL_RenderFillRect(renderer, &rect);
        // outline
        SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
        SDL_RenderDrawRect(renderer, &rect);

        // Player has clicked on tile and we want to show tilesheet graphics
        // Continue loop since current tile has not yet been revealed
        if (!board[i][j].isRevealed)
          continue;

        // Make sure we display correct texture within spritesheet
        // spritesheet is divided in 10 sprites from 0 to 8 mines
        // and of course the mine itself.
        SDL_Rect n;
        n.w=w;
        n.h=w;
        n.y=0;
        // Selecting correct tile
        n.x=board[i][j].n*w;

        // Copy correct texture from textures sheet
        SDL_RenderCopy(renderer, tex,&n,&rect);
      }
    }

    // Handle inputs
    SDL_Event e;
    while (SDL_PollEvent(&e)) {
      if (e.type == SDL_QUIT) {
        isRunning=false;
      }

      if (e.type == SDL_MOUSEBUTTONDOWN) {
        int mouseX, mouseY;
        Uint32 buttons; // NOTE: button_state is 32 bit integer
        buttons = SDL_GetMouseState(&mouseX, &mouseY); // getting state
        // Make sure mouse pointer is in field (and window)
        if (mouseX<0 || mouseX>320 || mouseY<0 || mouseY>320)
          continue;
        if (buttons & SDL_BUTTON(SDL_BUTTON_LEFT) ){ // Left mouse button
          // calculate which tile we are in and reveal it
          int i,j;
          i=mouseX/w;
          j=mouseY/w;
          board[i][j].isRevealed=true;

          // Crap.. We actually hit cell without neighboring mines
          // TODO: Reveal only horizontal/vertical neigbors; not diagonal?
          if (board[i][j].n==0) {
            // Flood fill time!!
            std::vector <std::pair<int,int>> pairs;
            auto pair = std::make_pair(i,j);
            pairs.push_back(pair);

            // Loop until all 0's are filled.
            while (!pairs.empty()) {
              // Get last pair out of que
              auto current = pairs.back();
              pairs.pop_back();

              for (int x = -1; x <= 1; x++) {
                for (int y = -1; y <= 1; y++) {
                  int xoff=current.first+x;
                  int yoff=current.second+y;
                  // Do not count outside array
                  if (xoff<0 || xoff>9 || yoff<0 || yoff>9)
                    continue;
                  // skip if revealed
                  if (board[xoff][yoff].isRevealed)
                    continue;

                  // finally reveal neigbor
                  board[xoff][yoff].isRevealed=true;
                  // if revealed tile is 0 also. push it back to be checked
                  if (board[xoff][yoff].n==0) {
                    auto newpair = std::make_pair(xoff, yoff);
                    pairs.push_back(newpair);
                  }
                }
              }
            }
          }
        }
      }
    }

    // Show currrent frame
    SDL_RenderPresent(renderer);
    // Sleep a bit TODO: fps gapping?
    SDL_Delay(20);

  }
  SDL_Delay(200);

  // Be kind and clean afterwards
  SDL_DestroyTexture(tex);
  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);
  SDL_Quit();
  return 0;
}




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