Is there a graphing library for D?

[dcoder]

I'm looking for a graphing library for D.  Preferrably, something 
that uses Qt, but it doesn't have to.  I am plotting sonar data, 
and I need to plot it 'live' so... I need something that is:

1. simple to use.  I just want to graph x,y data.
2. ability to scale the display.
3. displaying more than one curve on the same graph.
4. Allows for animation of data.  So, suppose I graph curve 1.
    Now I tell the library, okay data for curve 1 has been changed,
    please refresh graph.  In this manner, I can move an object, 
and
    see the reflection in 'real time'.

    Real time in my case would be 10-30ms.

Does such a library exist?  I click the library section on this 
site, and nothing  stood out.

thanks.