ns_plotPolygon.m

%% Plot an individual polygon for a given vertex coordinates. 
function ns_plotPolygon(vrList,bs,nei,sstn)

%% color scheme for a face with n neighbors.
% 0:light gray  1:light pink          2:light purple
% 3:red         4:green     5:yellow    6:gray      7:blue
% 8:magenta     9:cyan      10:brown    11:purple
col = [0.9,0.9,0.9;0.8,0.8,1;1,0.8,0.9;1,0,0;0,1,0;1,1,0;...
    0.7,0.7,0.7;0,0,1;1,0,1;0,1,1;0.9412,0.4706,0;0.251,0,0.502;];

%% Determine mirror image of polygon.
pb=[1+sstn,1;1,0;1-sstn,-1;...
    sstn,1;0,0;-sstn,-1;-1+sstn,1;-1,0;-1-sstn,-1]*bs;    
vrTmp=cell(size(pb,1),1);
for ii=1:size(pb,1)
    vrTmp{ii}=vrList+repmat(pb(ii,:),size(vrList,1),1);
end

%% Plot polygons with patch function.
for ii=1:size(pb,1)
    if nei>11
        patch(vrTmp{ii}(:,1),vrTmp{ii}(:,2),'white','FaceAlpha',0.5);
        hold on;
    else
        patch(vrTmp{ii}(:,1),vrTmp{ii}(:,2),col(nei+1,:),'FaceAlpha',0.7);
        hold on;
    end
end
    
end