How to keep positions of node/element number labels consistent with various FE mesh resolution?

Question

hmhuang 2021-11-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1599339-how-to-keep-positions-of-node-element-number-labels-consistent-with-various-fe-mesh-resolution

回答： Prateekshya 2024-10-7

I have a function plotting the FE mesh with node numbers and element numbers displayed. For (meshx,meshy) = (30,15), the positions of node/element number labels look perfect for me. I.e., node number shown on the bottom-right corner of the corresponding node; element number shown on the center of the corresponding element. However, as I scale FE mesh to (meshx,meshy) = (100,50), the positions of those labels moved away... How do I adpat the code so that the positions of those labels can be scaled with different mesh resolution?

function plotGrid(meshx, meshy)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Plot FE mesh and diaplay node numbers as well as element numbers
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    % Initialization of figure object and variables
    figure('Name', 'Finite Element Mesh', ...
           'Numbertitle','off', ...
           'Position', get(0, 'Screensize'));
    nNodes = (meshx+1)*(meshy+1);
    nElements = (meshx)*(meshy);
    [X_nodes,Y_nodes] = meshgrid(0:meshx, 0:meshy);
    [X_elements,Y_elements] = meshgrid(linspace(0.5, meshx-0.5, meshx), linspace(0.5, meshy-0.5, meshy));
    
    % Plot the grid lines
    plot(X_nodes, Y_nodes, 'k', X_nodes', Y_nodes', 'k');
    title('Finite Element Mesh');
    subtitle({sprintf('(meshx, meshy) = (%i, %i)', meshx, meshy), ''});
    set(gca,'YDir','reverse');
    set(gca,'XTick',[],'YTick',[],'XColor','None','YColor','None');
    
    % Create the lists of node numbers and element numbers
    nodeNumbers = mat2cell(num2str((1:nNodes)'), ones(nNodes,1));
    elementNumbers = mat2cell(num2str((1:nElements)'), ones(nElements,1));
    
    % Insert the labels for node numbers and element numbers
    text(X_nodes(:), Y_nodes(:)+0.1, nodeNumbers, 'FontSize', 8, 'Color', 'k');
    text(X_elements(:)-0.1, Y_elements(:), elementNumbers, 'FontSize', 10, 'FontWeight', 'bold', 'Color', 'r');
end

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Answer 1

Prateekshya 2024-10-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1599339-how-to-keep-positions-of-node-element-number-labels-consistent-with-various-fe-mesh-resolution#answer_1527805

Hello @hmhuang,

The figure you get with the parameters 100 and 50 is identical with the other one. Normally, the visual difference is because of the difference in sizes of the graphs. You can see the figure by zooming in. Here is a screenshot of the same.