contour plot with irregular grid

[Jane]

Hello,

I'm using XYPlot and XYBlockRenderer to draw contour plots. It worked fine until I had a dataset defined on an irregular gird.
What are the options for me?

Thanks in advance,

Jane

[RichardWest]

Couple options:
1) fill in the missing grid points with null values
2) create a custom renderer based on XYBlockRenderer