Animation delete previous point
显示 更早的评论
Hi
I'm trying to make an animation, where I only display one point at the time, right now the trajectory stays, and I want only one point displayed
any suggestions, i want it to look like this: https://www.youtube.com/watch?v=q1dqIcLi3N0
this is my code so far
x= Ball(:,1);
y= Ball(:,2);
%%
figure
curve = animatedline('marker','*','Color','r');
set(gca,'Xlim',[-6000 6000], 'Ylim',[-4000 4000])
for i= 1:length(Ball)
addpoints(curve,x(i),y(i));
drawnow
end
采纳的回答
If your task is that simple, I prefer updating the XData and YData rather than using the animatedline method. This is faster and more efficient. Instead of deleting and drawing a new point on each iteration, it merely changes the coordinate value of the point that is already drawn. If this is too fast, you can control the approximate timing by using pause() within the loop to slow it down.
Here's an example (just run this to watch a dot move along a sinusoidal trajectory).
x= 0:0.1:2*pi;
y= sin(x);
figure
ph = plot(x(1), y(1), 'r*'); %plot initial point
set(gca,'Xlim',[0 6.5], 'Ylim',[-1 1])
for i=1:length(y)
ph.XData = x(i); %change x coordinate of the point
ph.YData = y(i); %change y coordinate of the point
drawnow
pause(0.05) %control speed, if desired
end
If you prefer to use the animatedline method, just insert clearpoints() before you call addpoints().
for i= 1:length(Ball)
clearpoints(curve)
addpoints(curve,x(i),y(i));
drawnow
end
5 个评论
Morten Jørgensen
2019-2-28
Lorenzo
2025-4-8
any way to plot not only the "last" point but also the line up to the last point (Not the entire line, the sin function in this example) Thank you
ph = plot(nan(size(x)), nan(size(y)), 'r*'); %plot initial point
set(gca,'Xlim',[0 6.5], 'Ylim',[-1 1])
for i=1:numel(y)
ph.XData(i) = x(i); %change x coordinate of the point
ph.YData(i) = y(i); %change y coordinate of the point
drawnow
pause(0.05) %control speed, if desired
end
Walter Roberson
2025-4-21
编辑：Walter Roberson
2025-4-21
An alterative animatedline approach to the original question is
curve = animatedline('MaximumNumPoints', 1);
for i= 1:length(Ball)
addpoints(curve,x(i),y(i));
drawnow
end
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