function display_closed_contour(countour,style,origin_style)
if nargin==3
    plot([countour(1,1)],[countour(1,2)],origin_style);
end
for n=1:size(countour,1)-1
    plot([countour(n,1),countour(n+1,1)],[countour(n,2),countour(n+1,2)],style);
end
plot([countour(size(countour,1),1),countour(1,1)],[countour(size(countour,1),2),countour(1,2)],style);
end