Smooth XY Scatter Plot on MSChart Or Cubic Spline Fit

Hi All,

I want to replace the use of MSExcel for plotting curves with MSChart to make my packages independent. Now I am stuck to the problem of making the XY plots smooth. I mean I dont want a point-to-point straight line joining sort of curve which comes in MSChart, instead, I want something that comes with chart type constant "xlXYScatterSmooth" if done with MSExcel. Anybody has any solution?

On a second thought, I am also ready to plot a cubic spline fit of the points, if no readymade property is available. Does anybody have an algorithm for that?