Question

我想画一个圆圈并在Matlab情节图中移动它。我正在使用

 viscircles([8.1, 8.5], 1);

画圆圈。如何再次调用它来绘制一个新圆圈并删除原始圆圈？还有一种方法可以使用

drawnow

这样做的功能？

Answer 1

不是删除和重绘，只需在X和Y数据中引入一些常量来移动圆圈。

%%%%Borrowing some code from irreducible's answer%%%%
xc=1; yc=2; r=3;
th = 0:pi/50:2*pi;
x = r * cos(th) + xc;
y = r * sin(th) + yc;
h = plot(x, y);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
axis([-20 20 -20 20]); %Fixing axis limits 
for k=1:20       %A loop to visualise new shifted circles
    h.XData = x + randi([-10 10],1);   %Adding a constant in the x data
    h.YData = y + randi([-10 10],1);   %Adding a constant in the y data
    pause(0.5);  %Pausing for some time just for convenient visualisation
end

Answer 2

一种可能性是创建自己的圆形函数，返回绘图句柄：

function h = my_circle(xc,yc,r)
% xc x-center of circle
% yc y-center of circle
% r radius

th = 0:pi/50:2*pi;
x = r * cos(th) + xc;
y = r * sin(th) + yc;
hold on
h = plot(x, y);
hold off;

有了这个，你可以绘制你的圆圈

h = my_circle(1,2,3);

如果您不再需要它，请将其删除：

delete(h)

之后你可以绘制一个新的：

h2 = my_circle(1,2,4);

如何在Matlab中使用绘图移动圆圈

2 个答案: