I use the SDK, able to generate spreadsheet document.

now I want to insert an image into it but don't know where to start!

I know that adding a drawing part to a sheet, but what elements is needed I don't know.

and also the deep nesting class structure is givine me a headache...

Is there anyone can help? Any resources that I can get?

P.S. after attempting to insert image. I will attempt to generate and insert chart on the fly.