All, I am trying to write a graphing program that will plot contour lines with varying degrees of refinement. A course line would have only a few points, a highly refined line would have many points. I would like to use the DrawLines function and vary the size and contents of the PointF defined variable. Every example I have seen hard codes the point values and makes no reference to dynamically altering the pointF defined variable. Can anyone provide assistance? Thanks. Regards, Phil