How to move a marker along line in polar coordinate

Question

ロン 2023-2-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910075-how-to-move-a-marker-along-line-in-polar-coordinate

评论： Sulaymon Eshkabilov 2023-2-10

I want to draw a point that can move along to the Lemniscate of Bernoulli in polar coordinate. The example to move object along to a line is shown in this URL:https://www.mathworks.com/help/matlab/creating_plots/move-group-of-objects-along-line.html

The following code is the my try to realize my target. But it just can animate a line in coordinate system:

clear;

theta = -pi/4:0.001:0; % cosine of 2*theta will be positive for this range

r = -sqrt(cos(2*theta));

figure;

polarplot(theta, r, 'b', 'LineWidth',1.0);

hold on

h = animatedline;

rlim([0 1]);

h.LineWidth = 1.5;

h.LineStyle = ":";

h.Color=[1 0 0] ;

n= length(theta);

for k = 1:length(theta)

addpoints(h,theta(k),r(k))

drawnow

end

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Answer 1

Sulaymon Eshkabilov 2023-2-10

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910075-how-to-move-a-marker-along-line-in-polar-coordinate#answer_1168270

在 MATLAB Online 中打开

Here it is:

clear;

theta = -pi/4:0.001:0; % cosine of 2*theta will be positive for this range

r = -sqrt(cos(2*theta));

figure;

polarplot(theta, r, 'b', 'LineWidth',1.0);

hold on

H = animatedline('Marker', 'o', 'MaximumNumPoints',1);

for k = 1:length(theta)

addpoints(H,theta(k),r(k));

drawnow

end

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ロン 2023-2-10

Thank you very much. It works! You help me a lot

Sulaymon Eshkabilov 2023-2-10

Most welcome. Glad to help.

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Answer 2

Sulaymon Eshkabilov 2023-2-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910075-how-to-move-a-marker-along-line-in-polar-coordinate#answer_1168180

在 MATLAB Online 中打开

Here is the corrected plot that animates a marker.

clear;

theta = -pi/4:0.001:0; % cosine of 2*theta will be positive for this range

r = -sqrt(cos(2*theta));

figure;

polarplot(theta, r, 'b', 'LineWidth',1.0);

hold on

H = animatedline('Marker', 'o');

rlim([0 1]);

n= length(theta);

for k = 1:n

addpoints(H,theta(k),r(k))

drawnow

end

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ロン 2023-2-10

Thanks for your help. But what I mean is that one point moving along to the line like this: https://img2020.cnblogs.com/blog/1616994/202004/1616994-20200427202415851-43829874.gif

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