Today that when I work on a power point to show how one project will use the idldrawwidget COM dll, to analysis the raster, I thought about that there is many successful functions in IDL library, and if you just have some data from the feature and you want to analysis using the tools in IDL, like cluster, k-means, optimize and some thing like this, that you can just using the IDLDRAWWIDGET as a compute core and take advantage of the IDL.