Plotting a circle always around a moving point
26 views (last 30 days)
Show older comments
Rudrashis Majumder
on 4 Mar 2019
Commented: Rudrashis Majumder
on 4 Mar 2019
I need to plot a circle whose center is a moving point. The point is moving with its path being plotted using "animatedline". However, I want to show only the current circle centering the point at a particular instant and the previous circles are to be cleared. Please help.
0 Comments
Accepted Answer
KSSV
on 4 Mar 2019
x = linspace(0,2*pi) ;
y = cos(x) ;
R = 0.1 ;
for i = 1:length(x)
plot(x(1:i),y(1:i))
axis([0 6 -2 2])
hold on
xc = x(i)+R*cos(x) ;
yc = y(i)+sin(x) ;
plot(xc,yc,'r')
hold off
drawnow
pause(0.1)
end
Read about comet.
More Answers (1)
Jos (10584)
on 4 Mar 2019
Adapted from the help of animatedline:
numpoints = 10000;
x = linspace(0,4*pi,numpoints);
y = sin(x);
pc = [-.1 -.1 .2 .2] ; % position of circle
figure
h = animatedline;
hc = rectangle('Position', [x(1) y(1) 0 0]+pc,'Curvature',1, 'FaceColor','r') ; % draw circle
axis([-pi,5*pi,-1.5,1.5])
for k = 1:numpoints
addpoints(h,x(k),y(k))
set(hc,'Position', [x(k) y(k) 0 0] + pc) ; % adjust position of circle
drawnow update
end
See Also
Categories
Find more on Animation in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!