[visualization-api] Interactive line chart

[David_]

Hello all,
I'm trying to show a specific kind of graphic but I don't get it by now
with google chart.

I need something like a simulator, Imagine a line chart with cost on Y axis
and number of people in X axis, showing how much money would pay each
person buying some item together . With a few persons in the X axis then
the cost is big, and when the number of persons grows (to the right of the
chart) then the cost is decreased.

Well, I can show this graphic easily, but I would like some kind of
"persons simulator bar" allowing to increase/decrease the number of
persons. When you move that bar then a point (maybe crosshair) moves across
the line.

Has anybody seen something like that?

Thanks for your support.

Best regards,
David.