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104 lines
3.0 KiB
104 lines
3.0 KiB
3 years ago
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%--------------------------
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% @Author: Jingqiao Hu
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% @Date: 2021-11-01 15:24:36
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% @LastEditTime: 2022-01-03 21:55:46
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% c_vedges: the edges of each voronoi cell, [x1,y1,x2,y2] * n-rows
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% c_polys: the nodes of each voronoi cell, [x1,y1,x2,y2] * n-rows
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% c_nodes
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% nfaces_local: nfaces in each cvt
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%--------------------------
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% read file version
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function [c_nodes, c_faces, c_vedges, c_polys] = generate_mesh_fromCVT(ncvt, path0, delta)
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cc_nodes = cell(ncvt, 1);
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c_faces = cell(ncvt, 1);
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c_vedges = cell(ncvt, 1);
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c_polys = cell(ncvt, 1);
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polyvec = [];
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figure;
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for i = 40 : ncvt
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[vor_edges, pgon] = read_cvt(i-1, path0);
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c_vedges{i} = vor_edges;
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c_polys{i} = pgon; % [n,2]
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polyvec = [polyvec; polyshape(pgon)];
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[~, ~, tri_nodes, tri_faces] = read_cdt(i-1, path0, delta);
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c_nodes{i} = tri_nodes;
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c_faces{i} = tri_faces;
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plot(polyshape(pgon),'FaceColor','white','EdgeColor','k','LineWidth', 2, 'FaceAlpha',0); hold on;
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end
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axis equal; axis off
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% figure; h = plot(polyvec,'FaceColor','white','EdgeColor','black');
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% h.LineWidth = 1.5;
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end
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function [pnts_num, faces_num, nodes, faces] = read_cdt(i, path0, delta)
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datapath = [path0+'cdt'+num2str(i)];
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fileID = fopen(datapath, 'r');
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info = fscanf(fileID, '%f');
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pnts_num = info(1);
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faces_num = info(2);
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nodes = reshape(info(3 : 3+pnts_num*2-1), 2, [])'; % all nodes coodinates of cdt
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% faces = reshape(info(3+pnts_num*2 : end), 3, [])'; % faces of cdt, formed of node-nidx
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% faces = faces + 1; % faces begins with 0
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fclose(fileID);
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dt = delaunayTriangulation(nodes);
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% figure; clf; triplot(dt,'Color','black');
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faces = dt.ConnectivityList;
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% if i == 39
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triplot(dt,'LineStyle','--','Color','k','LineWidth', 1); hold on;
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% end
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faces = checkValid_trimesh(nodes, faces, delta);
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faces_num = size(faces, 1);
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end
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function [edges, pgon] = read_cvt(i, path0)
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datapath = [path0+'vcell'+num2str(i)];
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fileID = fopen(datapath, 'r');
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info = fscanf(fileID, '%f');
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pnts_num = info(1);
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edges = reshape(info(2 : end), 4, [])'; % [x1,y1,x2,y2]
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fclose(fileID);
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pgon = edges(:, 1:2);
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end
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% reorder the edges to [end to end]
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function new_edges = reorder_edges(edges)
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new_edges = edges;
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edges(1,:) = [];
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for i = 1 : size(new_edges, 1)-1
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nj = new_edges(i, 2);
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[r,c] = find(edges==nj);
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if c == 2
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new_edges(i+1, :) = fliplr(edges(r,:));
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else
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new_edges(i+1, :) = edges(r,:);
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end
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edges(r,:) = [];
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end
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end
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function [nodes_new, faces_new] = remove_repeated_nodes(nodes, faces)
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% remove the repeated nodes
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[nodes_new, ia, ic] = unique(nodes, 'rows'); % new=nodes(ia), nodes=new(ic)
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old_order = [1 : nidx]';
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new_order = ic;
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faces_new = changem(faces,new_order,old_order);
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% faces = faces_new;
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% nodes = nodes_new;
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end
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