void SET_PANEL(PANEL* my_pan,my_x,my_y)
{
   my_pan.scale_x = screen_size.x / 1024;
   my_pan.scale_y = screen_size.y / 768;
   my_pan.pos_x = my_x * screen_size.x / 1024;
   my_pan.pos_y = my_y * screen_size.y / 768;
}

...
INIT_PANELS()
{
   SET_PANEL(pause,50,60);
   SET_PANEL(anderes_panel,150,30);
   SET_PANEL(noch_ein_panel,screen_size.x / 2,screen_size.y / 2);
}