Algodoo

Press the "MAKE CIRCLE" button to make a circle.

For the settings in the circle, do the following:
For the scripts, change the respective box text (the ones that say "(e)=>{}" to the script.
For the color, change the respective color (as said on the box).
For the radius, change the radius box's text.

To make a new number value, copy the radius box (and laser) and paste it (or ctrl/command+click+drag or the clone button).

Example settings:
the blue bar should say "(yourshere)"
make the new variable in the console as "scene.my.(yourshere) = 0"
the onHitByLaser should say "(e)=>{scene.my(yourshere)=math.eval(text)}"
and add into the click script on the MAKE CIRCLE box "(yourshere) := scene.my.(yourshere)".

Yes it only works in algodoo, but that's ok.