x_inner=40;     %length
y_inner=40;     %width
z_inner=10;     %height

distance_x=5;
distance_y=5;
distance_z=5;

%定义各平面与轴的交点位置；
x_outer=x_inner+2*distance_x;
y_outer=y_inner+2*distance_y;
z_outer=z_inner+2*distance_z;

x_inner1=x_inner/2;     
x_inner2=-x_inner/2;    
y_inner1=y_inner/2;     
y_inner2=-y_inner/2;    
z_inner1=z_inner/2;     
z_inner2=-z_inner/2;     


x_outer1=x_outer/2;     
x_outer2=-x_outer/2;    
y_outer1=y_outer/2;     
y_outer2=-y_outer/2;    
z_outer1=z_outer/2;     
z_outer2=-z_outer/2;

%画出内正方体框（检验质量块）；
%顶点矩阵;
vertex_matrix=[x_inner2 y_inner2 z_inner2;x_inner1 y_inner2 z_inner2;x_inner1 y_inner1 z_inner2;x_inner2 y_inner1 z_inner2;
               x_inner2 y_inner2 z_inner1;x_inner1 y_inner2 z_inner1;x_inner1 y_inner1 z_inner1;x_inner2 y_inner1 z_inner1];

%连接矩阵：连接关系矩阵每一行中的数值分别表示顶点矩阵的行标;
face_matrix=[1 2 6 5;2 3 7 6;3 4 8 7;
             4 1 5 8;1 2 3 4;5 6 7 8];
patch('Vertices',vertex_matrix,'Faces',face_matrix,'FaceVertexCData',hsv(8),'FaceColor','none')


%画出外正方体框（电极笼）；
%顶点矩阵;
vertex_matrix=[x_outer2 y_outer2 z_outer2;x_outer1 y_outer2 z_outer2;x_outer1 y_outer1 z_outer2;x_outer2 y_outer1 z_outer2;
               x_outer2 y_outer2 z_outer1;x_outer1 y_outer2 z_outer1;x_outer1 y_outer1 z_outer1;x_outer2 y_outer1 z_outer1];

%连接矩阵：连接关系矩阵每一行中的数值分别表示顶点矩阵的行标;
face_matrix=[1 2 6 5;2 3 7 6;3 4 8 7;
             4 1 5 8;1 2 3 4;5 6 7 8];
patch('Vertices',vertex_matrix,'Faces',face_matrix,'FaceVertexCData',hsv(8),'FaceColor','none')


view(3);

axis square

MATLAB画正方体

X=zeros(8,3);
X([5:8,11,12,15,16,18,20,22,24])=1;
d=[1 2 4 3 1 5 6 8 7 5 6 2 4 8 7 3];
plot3(X(d,1),X(d,2),X(d,3));
view(3); rotate3d;

简介

以前的博文中已经讲解过如何画立方体以及画圆的方法。这里将如何画矩形和圆的方法写成函数形式，直接提供出来，方便大家使用。

画矩形代码

% Example
% cx = 1;
% cy = 1;
% radius = 1;
% alpha = 0.8;
% face_color = rand(1,3);
% edge_color = rand(1,3);
% rectangle_patch(cx, cy, radius, face_color, edge_color, alpha)

function rectangle_patch(x, y, r, face_color, edge_color, alpha)
xs = [x-r, x-r, x+r, x+r];
ys = [y+r, y-r, y-r, y+r];
patch(xs, ys, face_color, 'facealpha', alpha, 'edgecolor', edge_color);
end

画圆代码

% Example
% cx = 1;
% cy = 1;
% radius = 1;
% alpha = 0.8;
% face_color = rand(1,3);
% edge_color = rand(1,3);
% circle_patch(cx, cy, radius, face_color, edge_color, alpha)

function circle_patch(cx, cy, radius, face_color, edge_color, alpha)
t = 0:.1:2*pi;
x = radius * cos(t) + cx;
y = radius * sin(t) + cy;
patch(x, y, face_color, 'facealpha', alpha, 'edgecolor', edge_color);
end

效果