# Moving a circle around a point along with it.

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Pallov Anand le 27 Avr 2023
Commenté : Pallov Anand le 30 Avr 2023
Suppose i have a point located at (5,5) having a circle of radius 1 around it. If the point moves from 5,5 to any other point say (0,0). The circle should also move with it.
Can someone give the matlab code for this.
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### Réponse acceptée

Sugandhi le 28 Avr 2023
Hi Pallov Anand,
I understand that If the point moves from 5,5 to any other point say (0,0). The circle should be drawn with center as (0,0).The code you requested could be like this:
% Define initial position of point and radius of circle
x = 5;
y = 5;
r = 1;
% Create figure window and draw initial point and circle
figure;
hold on;
plot(x, y, 'ro');
viscircles([x, y], r);
% Define new position of point
new_x = 0;
new_y = 0;
% Move point and circle to new position
dx = new_x - x;
dy = new_y - y;
x = new_x;
y = new_y;
clf;
hold on;
plot(x, y, 'ro');
viscircles([x, y], r);
% Repeat the above code to move the point and circle to any other position as desired
In this code, x and y represent the x and y coordinates of the point, and r represents the radius of the circle. The `viscircles` function is used to draw the circle around the point.
To move the point and circle to a new position, we first define the new position by setting new_x and new_y to the desired coordinates. We then calculate the difference between the new position and the current position using dx = new_x - x and dy = new_y - y. Finally, we update x and y to the new position, and redraw the point and circle at the new location.
You can repeat the code to move the point and circle to any other position as desired.
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VBBV le 29 Avr 2023
You can use Matlab built in function animatedline to do the same in simpler way as below
clearvars
close all
% Present position of centre of circle
Xc = 2;
Yc = 4;
r = 3;
% define axes
axis([-10,10,-10,10])
th = linspace(0, 2*pi, 1000);
% new position ( can also get from user input)
Xnew = 5;
Ynew = 3;
DisX = linspace(Xc,Xnew,30);
DisY = linspace(Yc,Ynew,30);
h = animatedline('Marker','.','Color','b');grid
for k = 1:length(DisX)
xc = r*cos(th) + DisX(k);
yc = r*sin(th) + DisY(k);
drawnow
pause(0.1)
clearpoints(h)
end
drawnow
Pallov Anand le 30 Avr 2023
Thanks for this too. This also works.

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