RE: Custom rendering

I am just wondering how visad can be used to fill in the entire area under a 
curve.
given a curve constructed from a set of (two or three ) points , how do visad 
fill the entire area that is under the curve ? constructors or methods or any 
Ideas ?
 
how do you change the color background of the visad visualization box to a 
different color ?
 
thanks
 
Isaac