how to draw a meshed geometry?

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Pooneh Shah Malekpoor
回答： KSSV 2023-4-17
Hi
I aim to write a code which draws a geometry and then mesh it! Could you please tell me how can I edit this code so it gives out the attached figure? (please ignore the colorful pattern, I only need a meshed geometry)
% Define the vertices of the triangle
v1 = [0, 0];
v2 = [20, 0];
v3 = [30, -10];
v4 = [50, -10];
v5 = [50, -20];
v6 = [0, -20];
% Create a matrix with the vertices as rows
vertices = [v1; v2; v3; v4; v5; v6];
% Define the faces of the triangle as a 1-by-3 matrix
faces = [1, 2, 3, 4, 5, 6];
% Create a patch object with the specified vertices and faces
patch('Vertices', vertices, 'Faces', faces, 'FaceColor', 'white');
% Set the axis limits and labels
axis([0, 50, -20, 0]);
xlabel('x-axis');
ylabel('y-axis');
hold on
x1=0;
x2=50;
y1=0;
y2=-20;
npoints_x=51;
npoints_y=21;
% Create a grid of points using the meshgrid function
x_grid = linspace(x1, x2, npoints_x);
y_grid = linspace(y1, y2, npoints_y);
hold on
[X, Y] = meshgrid(x_grid, y_grid);
hold on
mesh (X,Y,zeros(size(X)))

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采纳的回答

KSSV
KSSV 2023-4-17
Ran in:
clc; clear all ;
% Define the vertices of the triangle
v1 = [0, 0];
v2 = [20, 0];
v3 = [30, -10];
v4 = [50, -10];
v5 = [50, -20];
v6 = [0, -20];
% Create a matrix with the vertices as rows
vertices = [v1; v2; v3; v4; v5; v6; v1];
% % Define the faces of the triangle as a 1-by-3 matrix
% faces = [1, 2, 3, 4, 5, 6];
%
% % Create a patch object with the specified vertices and faces
% patch('Vertices', vertices, 'Faces', faces, 'FaceColor', 'white');
%
% % Set the axis limits and labels
% axis([0, 50, -20, 0]);
% xlabel('x-axis');
% ylabel('y-axis');
%
% hold on
x1=0;
x2=50;
y1=0;
y2=-20;
npoints_x=51;
npoints_y=21;
% Create a grid of points using the meshgrid function
x_grid = linspace(x1, x2, npoints_x);
y_grid = linspace(y1, y2, npoints_y);
[X, Y] = meshgrid(x_grid, y_grid);
Z = rand(size(X)) ;
idx = inpolygon(X,Y,vertices(:,1),vertices(:,2)) ;
Z(~idx) = NaN ;
h = pcolor(X,Y,Z) ;
h.EdgeColor = 'none' ;

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