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I have got the right coordinate by checkpoint and onDrawCheckPoint after I export the content to a image when exporting one column.But if I want to calculate the the coordinate in case of exporting multiple columns,I do need to know which page the item is.Can I do that? How? Thank u again:)
By the way,how to get the content width( text maybe including some inline image)

Obviously, you need to add coordinates of the top left corner of the page to the checkpoint coordinates from the event.
How to get top left page coordinates, depends on the way you choose for drawing pages.

Thank u:)