Using the Keyboard

#include "graphapp.h"
#include <ctype.h>

point location = {0,0};

void key_down(drawing d, int key)
{
  char letter[2];
  int width;

  if (! isprint(key))
    return;
  sprintf(letter, "%c", key);
  width = strwidth(FixedFont, letter);
  if (location.x + width > getwidth(d)) {
    location.x = 0;
    location.y += getheight(FixedFont);
  }
  setfont(FixedFont);
  drawstr(location, letter);
  location.x += width;
}

void main(void)
{
  window w;
  drawing d;

  w = newwindow("Press a Key", rect(50,50,200,200),
                StandardWindow);
  d = newdrawing(rect(10,10,180,180), NULL);
  setbackground(w, LightGrey);

  setkeydown(d, key_down);

  show(w);
  mainloop();
}

• Source code: keydowns.c