I browsed through the gallery of animated example under pgf but didn't find my answer.
I would like this kind of pictures: take 4 points located at
r varying from
2 by step
draw a circle of radius
r cm around each of these points (a frame corresponds to a value of
r); below the circles, draw four lines,
the first ends at
r=0.5, the second ends at
\draw (0,-3) -- (min(r,1), -3);
I'm stuck with the computation of the minimum since I don't know what kind of variable should be
r (a counter, a sort of argument) and with the varying sizes of the circle because I don't know how to indicate the unit.
Any help would be appreciated.