Windows and Redraw Functions

#include "graphapp.h"

void draw_window(window w, rect winrect)
{
  rect r = rect(10,10,80,10);

  setcolour(Red);
  drawrect(r);

  setcolour(Blue);
  fillrect(rect(10,40,80,10));
}

void main(void)
{
  window w;

  w = newwindow("Rectangles", rect(0,0,170,100),
                StandardWindow);
  setredraw(w, draw_window);
  show(w);
  mainloop();
}