Hi,

I know that technically this is outside the scope of this newsgroup but 
searching Google Groups revealed lots of information about this topic came 
from this group.

I'm trying to create a Cardinal Spline in VB and since I'm using 'classic' 
version 6 and not the newer .net version I don't have access to 
Graphics.DrawCurve()

Now after lots of research I keep coming back to this formula: Ti = a * ( 
Pi+1 - Pi-1 )
taken from this page: http://cubic.org/docs/hermite.htm as suggested by 
'Dake' on here.

However I don't understand how that formula can provide a tangent.

Can someone please provide a better explanation as to how I implement it 
into my program please? I've never come across a formula where the inputs 
are 'fixed' and normally I can put a new value through to produce a 
different output.

Thanks in advance,

Michael