need help in making circles move with some velocity

Question

Faiza Gul 2020-4-23

0
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https://ww2.mathworks.cn/matlabcentral/answers/520268-need-help-in-making-circles-move-with-some-velocity

评论： Faiza Gul 2020-4-29

I am trying to make my static circles move with some linear velocity. I have created circles with "fill command" and I have separate function for linear movement but now I am unable to merge my linear movement function into actual function. I dont know where to put it.. I tried so many times but I always get static circles.

here is code:

 theta=linspace(0,2*pi,100);
    N = numel(xobs);
for k=1:N
        fill(xobs(k)+robs(k)*cos(theta),yobs(k)+robs(k)*sin(theta),[1 1 0]);
        hold on
end

where as

xobs=[1.5 4.0 3.2 7.0 8]; yobs=[2.3 4 2 7 5]; robs=[0.5 0.5 0.5 0.5 0.5];

and for linear movement:

function [xp_new,yp_new]= motionlinear( xobs, yobs)
h= 0.1;
xobs=0;
yobs=0;
v=0:1;
theta=linspace(0,2*pi,100);
for k=1:h:5
 xp_new = v*cos(theta)+ xobs;
 yp_new = v*sin(theta)+ yobs;
 plot (xp_new,yp_new,'-or') % I am trying t fit the plot somewhere in my actual code
 hold on
end

3 个评论
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Faiza Gul 2020-4-27

where should I add this part?

darova 2020-4-27

here

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Answer 1

Geoff Hayes 2020-4-27

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/520268-need-help-in-making-circles-move-with-some-velocity#answer_428709

在 MATLAB Online 中打开

Faiza - try the following

function myMainFunction
close all;
% initial position for five circles
xobs=[1.5 4.0 3.2 7.0 8];    
yobs=[2.3 4 2 7 5];
robs=[0.5 0.5 0.5 0.5 0.5];
theta=linspace(0,2*pi,100);
N = numel(xobs);
% create an array of handles to the fill objects (circles)
hFill = zeros(N,1);
for k=1:N
    hFill(k) = fill(xobs(k)+robs(k)*cos(theta),yobs(k)+robs(k)*sin(theta),[1 1 0]);
    hold on;
end
% set some arbitraty limits on the axes
ylim([0 50])
xlim([0 50])
while true
    % call your linear motion function - the output replaces the input
    [xobs, yobs] = motionlinear(xobs, yobs);
    for k = 1:N
        % updated the x and y data for each fill object
        set(hFill(k), 'XData', xobs(k)+robs(k)*cos(theta), 'YData', yobs(k)+robs(k)*sin(theta));
    end
    pause(0.5); 
end
function [xobs, yobs]= motionlinear(xobs, yobs)
% is v supposed to be an array of velocities?
v=[1 1];
% I chose this angle (not sure why you were using an array of values?)
theta=pi/4;
% set the new positions
xobs = v(1)*cos(theta) + xobs;
yobs = v(2)*sin(theta) + yobs;