how to make different points movable in MATLAB

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passioncoding 2019-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/442832-how-to-make-different-points-movable-in-matlab

编辑： Walter Roberson 2019-2-6

采纳的回答： Walter Roberson

I wanted help in making different point moving with constant velocity. All points should be moving at constant speed.

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Walter Roberson 2019-2-2

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Use scatter and record the handle . Loop updating the XData and YData properties of the handle and drawnow()

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passioncoding 2019-2-6

Since I want to make the points moving with constant velocity, Vobs can be fixed number. Secondly yes its a theta, direction for particels/point to move forward.

Walter Roberson 2019-2-6

编辑：Walter Roberson 2019-2-6

在 MATLAB Online 中打开

%need _some_ Vobs and theta
theta = rand() * 2 * pi;
Vobs = rand() * 10;
h=msgbox('Select Obstacles using the Left Mouse button,to select the last obstacle use the Right button');
  xlabel('Select Obstacles using the Left Mouse button,to select the last obstacle use the Right button','Color','blue');
uiwait(h,10);
if ishandle(h) == 1
    delete(h);
end
count = 0;
xvals = []; yvals = [];
while true
  [xval,yval,but] = ginput(1);
  if isempty(xval); break; end
  count = count + 1;
  xvals(count) = floor(xval);
  yvals(count) = floor(yval);
end
dx = Vobs * cos(theta);
dy = Vobs * sin(theta);
pointsize = 10;
h = scatter(xvals, yvals, pointsize, 'r');
for step = 1 : 100
    xvals = xvals + dx;
    yvals = yvals + dy;
    set(h, 'XData', xvals, 'YData', yvals);
    drawnow();
end