Create Circle In 3-D Axes

Question

I am newbie in matlab.

I want to draw something like below pic in 3-D axes and move it mouse move.

i do not have problem with second part(move objects on mouse move) , i do not know how to create this circle in 3-D axes

Answer 1

elevation = linspace(0,2*pi,100);
r = ones(1,100);
azimuth = .75 * pi *ones(1,100);
while 1
  axis([-10 10 -10 10 -10 10])
  view([20 20 5])
  [newx newy] = ginput(1);
  [x,y,z] = sph2cart(azimuth,elevation,r);
  x = x + newx;
  y = y + newy;
  patch(x,y,z,[1 0 0],'EdgeColor','r');
  axis([-10 10 -10 10 -10 10])
end

You can change the radius by r like r = .5 * ones(1,100);

But the coordinates of click doesn't seem to be right.

I think you have solved that problem in your previous question.

Note

Coordinates returned by ginput are scaled to the XLim and YLim bounds of the axes you click (data units). The figure CurrentPoint property, by contrast, is always returned in figure Units, irrespective of axes Units or limits`