xwindow_ascii.c

xwindow_ascii.c

#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>

#define BORDER 2
#define WIDTH  350
#define HIGHT 250

int main(int argc,char **argv){
  Display *dpy;
  Window w;
  Window root;
  int    screen;
  unsigned long black, white;
  char here[9];
  XEvent e;
  KeySym key;
  char string[10];
  int l = 0;
  GC       gc; 
  int mouseX, mouseY;

  dpy = XOpenDisplay("");
  root = DefaultRootWindow (dpy);
  screen = DefaultScreen (dpy);
  white = WhitePixel (dpy, screen);
  black = BlackPixel (dpy, screen);

  w = XCreateSimpleWindow(dpy, root, 100, 100, WIDTH, HIGHT, BORDER, black, white);
  gc = XCreateGC(dpy, w, 0, NULL);
  XSelectInput(dpy, w, ButtonPressMask | ButtonReleaseMask | KeyPressMask);
  XMapWindow(dpy, w); 
  while(1){
  /* event loop */
    XNextEvent(dpy, &e);
    switch(e.type){
      case ButtonPress:
        printf("x:%d, y:%d, button:%d\n",
                e.xbutton.x, e.xbutton.y, e.xbutton.button);
        mouseX = e.xbutton.x;
        mouseY = e.xbutton.y;
        break;
      case ButtonRelease:
        XDrawPoint(dpy, w, gc, mouseX, mouseY);
        break;
      case KeyPress:
        if(XLookupString(&e, string, 9, &key, NULL) == 1){ 
          here[0] = string[0];
          here[1] = '\0';
          XDrawString(dpy, w, gc, 30+l, 200, here, strlen(here));
          l += 10; 
        }   
        printf("keycode:%d\n", e.xkey.keycode);
        break;
    }   
  }
}