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     while(running) {
  33         event.type = 0;
  34         if(SDL_PollEvent(&event)) {
  35            switch(event.type){
  36              case SDL_QUIT:
  37                 running = 0;
  38                 break;
  39              case SDL_KEYDOWN:
  40                 //case SDL_KEYUP:
  41                 printf("Key: %d\t%d\t%d\n", event.key.keysym.scancode, event.key.keysym.sym, event.key.keysym.mod );
  42                 break;
  43              case SDL_MOUSEBUTTONDOWN:
  44                 //do whatever you want to do after a mouse button was pressed,
  45                 // e.g.:
  46                 //if(event.button.button == SDL_BUTTON_LEFT) {
  47                   while(event.type != SDL_MOUSEBUTTONUP) {
  48                         SDL_GetMouseState(&mouseX, &mouseY);
  49                         SDL_RenderDrawPoint(renderer, mouseX, mouseY);
  50                         SDL_RenderDrawPoint(renderer, mouseX, mouseY+1);
  51                         SDL_RenderDrawPoint(renderer, mouseX+1, mouseY);
  52                         SDL_RenderDrawPoint(renderer, mouseX+1, mouseY+1);
  53                         SDL_RenderPresent(renderer);
  54                         SDL_PollEvent(&event);
  55                   }
  56                   printf("Click: %d\t%d\t%d\n", mouseX, mouseY, event.button.button);
  57                 //}
  58                 break;
  59            }
  60         }
  61         usleep(10000);
  62     }
  63     SDL_DestroyRenderer(renderer);
  64     SDL_DestroyWindow(window);
  65     SDL_Quit();
  66     return EXIT_SUCCESS;
  67 }