how can I plot a trajectory of moving point ?

if I have random MOVING point, can I plot its trajectory as a line ?

for example when this point move from A to B, so I want to plot solid line between A and B,

when I used Linestayle as '-' to draw solid line doesnt work

Please have a look to the below code, and I would appreciate if you have any help

Thanks in advance

function MOVE(npts, v, radius, center)
npts=1; v=28.8/3.6; radius=1000; center=[0 0];
    direction = rand(npts, 1) * 2 *pi;
    theta = rand(npts, 1) * 2*pi;
    r = radius * sqrt(rand(npts, 1));  
    XY = [r .* cos(theta(:)) + center(1), r .* sin(theta(:)) + center(2)];
    hfig = figure('Color', 'w');
    hax = axes('Parent', hfig);
    hdots = plot(XY(:,1), XY(:,2),'Parent', hax,'Marker', '.','Color', 'k','LineStyle', '-','MarkerSize', 12);
    hold(hax, 'on')
    axis(hax, 'equal')
    t = linspace(0, 2*pi, 100);
    plot(radius * cos(t) + center(1),radius * sin(t) + center(2))
    for i=1:100
        
        [XY, direction] = movePoint(XY, direction, v, radius, center);
        set(hdots, 'XData', XY(:,1), 'YData', XY(:,2))
        drawnow
    end
end 

function [XYnew, direction] = movePoint(XY, direction, v, radius, center)
    % Compute the next position of the points
    DX = [cos(direction(:)) .* v, sin(direction(:)) .* v];
    XYnew = XY + DX;

 
end

Answer 1

[Chunru]

npts=1; v=28.8/3.6; radius=1000; center=[0 0];
 MOVE(npts, v, radius, center)

 
function MOVE(npts, v, radius, center)
    direction = rand(npts, 1) * 2 *pi;
    theta = rand(npts, 1) * 2*pi;
    r = radius * sqrt(rand(npts, 1));  
    XY = [r .* cos(theta(:)) + center(1), r .* sin(theta(:)) + center(2)];
    hfig = figure('Color', 'w');
    hax = axes('Parent', hfig);
    hdots = plot(XY(:,1), XY(:,2), 'Parent', hax,'Marker', '.','Color', 'k','LineStyle', '-','MarkerSize', 12);
    hold(hax, 'on')
    axis(hax, 'equal')
    t = linspace(0, 2*pi, 100);
    plot(radius * cos(t) + center(1),radius * sin(t) + center(2))
    for i=1:100
        
        [XY, direction] = movePoint(XY, direction, v, radius, center);
        XData = [hdots.XData XY(:, 1)];
        YData = [hdots.YData XY(:, 2)];
        set(hdots, 'XData', XData, 'YData', YData)
        drawnow
    end
end 
function [XYnew, direction] = movePoint(XY, direction, v, radius, center)
    % Compute the next position of the points
    DX = [cos(direction(:)) .* v, sin(direction(:)) .* v];
    XYnew = XY + DX;
 
end

Answer 2

[omar th]

Thank you so much