else if((*iter)->get_type()&Duck::TYPE_VERTEX)
screen_duck.color=DUCK_COLOR_VERTEX;
else if((*iter)->get_type()&Duck::TYPE_RADIUS)
else if((*iter)->get_type()&Duck::TYPE_VERTEX)
screen_duck.color=DUCK_COLOR_VERTEX;
else if((*iter)->get_type()&Duck::TYPE_RADIUS)