Nothing
expose_event_callback <- function(widget, event, data) {
gdkDrawArc(widget[["window"]],
widget[["style"]][["fgGc"]][[widget[["state"]]+1]],
TRUE, 0, 0, widget[["allocation"]]$width,
widget[["allocation"]]$height, 0, 64 * 360)
return(TRUE)
}
[...]
drawing_area = gtkDrawingArea()
drawing_area$setSizeRequest(100, 100)
gSignalConnect(drawing_area, "expose_event", expose_event_callback)
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