void CS27Wnd::OnTimer(UINT nIDEvent)
{xmov = +5;
ymov = +5;
if (xpos + xmov > win_xsize) {
xmov = -5; }
if (ypos + ymov > win_ysize) {
ymov = -5; }
if (xpos + xmov < 0) {
xmov = +5; }
if (ypos + ymov < 0) {
ymov = -5; }
xpos = xpos + xmov;
ypos = ypos + ymov;
Invalidate();　}