# Create a point with a number inside

1 次查看（过去 30 天）
Hoang Vu Huy2023-2-23

I want to creat a fig: How to creat a point with a number inside?

### 回答（3 个）

Simon Chan 2023-2-23
r = 5; % Radius of small circle
rho = 50; % Radius of big circle
Np = 16; % Number of circle
theta = linspace(pi,-pi,Np+1);
[x,y] = pol2cart(theta,rho); % coordinates of small circle center
t = linspace(0, 2*pi);
apoint = 1:Np; % Line connection, starting point
bpoint = circshift(1:16,-4); % Line coonection, end point
for w = 1:Np
line([x(apoint(w)) x(bpoint(w))],[y(apoint(w)) y(bpoint(w))],'Color','k'); % Draw lines first
end
rectangle('Position',[-rho -rho 2*rho 2*rho],'Curvature',[1 1])% % Draw big circle
for k = 1:Np
patch(x(k)+r*cos(t), y(k)+r*sin(t), 'w','FaceAlpha',1); % Draw small circle
end
axis equal
axis off ##### 1 个评论显示 无隐藏 无
What an elegant solution. Bravo Simon.

Walter Roberson 2023-2-23
viscircles() and text()
Or possibly use a quite large 'o' marker, and text()
Or create patch objects with face color white. fill() could be used for that.
##### 0 个评论显示 -1更早的评论隐藏 -1更早的评论

KSSV 2023-2-23
th = linspace(0,2*pi) ;
x = cos(th) ;
y = sin(th) ;
% Make numbers
idx = 1:5:length(th) ;
figure
hold on
plot(x,y,'k','LineWidth',2)
scatter(x(idx),y(idx),300,'O','MarkerEdgeColor','k','MarkerFaceColor','w')
text(x(idx),y(idx),num2str(idx')) ### 类别

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