> how do I refresh and clear the canvas if it has some lines or shapes on
> it?
This will depend on what API you're using for your graphics. If you're using
raw Xlib, use XClearWindow():
XClearWindow( fl_get_display(), FL_ObjWin( my_canvas ) );
If you're using some other graphics API such as OpenGL, consult your
manual.
spl
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