%--------------------------
 % @Author: Jingqiao Hu
 % @Date: 2022-01-08 22:27:37
 % @LastEditTime: 2022-01-08 22:28:52

 % c_interPolyMMC: the intersected polygon for each mmc
 % c_interPolySeed: the intersected polygon for each seed
%--------------------------
function [c_interPolyMMC, c_interPolySeed] = do_intersection(MMCs_poly, c_poly, c_nnbEdgeIDX)

    ncvt  = size(c_nnbEdgeIDX, 1);
    
    % computer the intersected-idx of each polygon-cell for each MMC
    c_interPolyMMC = mexInterPoly(MMCs_poly, c_poly);

    % compute the intersected-idx of each polygon-cell for each seed
    c_interPolySeed = cell(ncvt, 1);
    parfor i = 1 : ncvt
        MMCs_id = c_nnbEdgeIDX{i}; % the corresponding idx in MMCs_poly for each seed
        interP = [];

        for j = 1 : numel(MMCs_id)
            mj     = MMCs_id(j);         % this MMCs_poly id
            pgonID = c_interPolyMMC{mj}; % the intersected mesh-polygon with this MMC

            for k = 1 : length(pgonID)
                interP = [interP; pgonID];
            end
        end
        c_interPolySeed{i} = unique(interP);
    end

%     % test
%     for i = 1 : ncvt
%         figure(4); clf
%         voronoi(seeds(:,1), seeds(:,2)); hold on;
%         scatter(seeds(i,1), seeds(i,2), 'filled'); hold on;
%         
%         pid = c_interPolySeed{i};
%         for j = 1:length(pid)
%             pgon = c_poly{pid(j)};
%             plot(polyshape(pgon)); hold on;
%         end
%     end
end