How do I draw a rubber band line?

"小帅猪" <[email protected]> Mon, 6 May 2013 12:34:20 +0800

Newsgroups	gmane.comp.lib.cairo
Message-ID	<[email protected]>

In GDI, I can draw a rubber band line with xor mode.
To use Cairo, How do I draw a rubber band line like GDI?

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