c/SDL2_putpixel_click/main.c

   1 //gcc -Wextra -pedantic-errors -o main.out main.c -lSDL2
   2
   3 #include <unistd.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6
   7 #include <SDL2/SDL.h>
   8
   9 #define WINDOW_WIDTH 600
  10
  11 int main(void) {
  12     SDL_Event event;
  13     SDL_Renderer *renderer;
  14     SDL_Window *window;
  15     int i;
  16
  17     SDL_Init(SDL_INIT_VIDEO);
  18     SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_WIDTH, 0, &window, &renderer);
  19     //SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
  20
  21     SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
  22     SDL_RenderClear(renderer);
  23     SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
  24
  25     for (i = 0; i < WINDOW_WIDTH; ++i)
  26       SDL_RenderDrawPoint(renderer, i, i);
  27
  28     SDL_RenderPresent(renderer);
  29
  30     int running = 1;
  31     int mouseX, mouseY;
  32     Uint32 fullscreen_status = 0;
  33
  34     while(running) {
  35         event.type = 0;
  36         if(SDL_PollEvent(&event)) {
  37            switch(event.type){
  38              case SDL_QUIT:
  39                 running = 0;
  40                 break;
  41              case SDL_KEYDOWN:
  42                 //case SDL_KEYUP:
  43                 printf("Key: %d\t%d\t%d\n", event.key.keysym.scancode, event.key.keysym.sym, event.key.keysym.mod );
  44
  45                 if(event.key.keysym.scancode == SDL_SCANCODE_F && event.key.keysym.mod == KMOD_LCTRL) {
  46                      fullscreen_status = fullscreen_status ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP;
  47                      SDL_SetWindowFullscreen(window, fullscreen_status);
  48                 }
  49
  50                 if(event.key.keysym.scancode == SDL_SCANCODE_Q && event.key.keysym.mod == KMOD_LCTRL) {
  51                      running = 0;
  52                 }
  53
  54                 break;
  55              case SDL_MOUSEBUTTONDOWN:
  56                 //do whatever you want to do after a mouse button was pressed,
  57                 // e.g.:
  58                 //if(event.button.button == SDL_BUTTON_LEFT) {
  59                   while(event.type != SDL_MOUSEBUTTONUP) {
  60                         SDL_GetMouseState(&mouseX, &mouseY);
  61                         SDL_RenderDrawPoint(renderer, mouseX, mouseY);
  62                         SDL_RenderDrawPoint(renderer, mouseX, mouseY+1);
  63                         SDL_RenderDrawPoint(renderer, mouseX+1, mouseY);
  64                         SDL_RenderDrawPoint(renderer, mouseX+1, mouseY+1);
  65                         SDL_RenderPresent(renderer);
  66                         SDL_PollEvent(&event);
  67                   }
  68                   printf("Click: %d\t%d\t%d\n", mouseX, mouseY, event.button.button);
  69                 //}
  70                 break;
  71            }
  72         }
  73         usleep(10000);
  74     }
  75     SDL_DestroyRenderer(renderer);
  76     SDL_DestroyWindow(window);
  77     SDL_Quit();
  78     return EXIT_SUCCESS;
  79 }