GtkDrawingArea), a GdkDrawable
(like a GdkPixmap), a GtkPrintContext or a
Cairo context to a Cairo graphics device, so that R plot
commands draw to the given target.asCairoDevice(widget, pointsize = 12, width = 500, height = 500)GtkWidget, GdkDrawable,
GtkPrintContext, or Cairo context, to which the R
graphics are to be drawnwidget is a
Cairo contextwidget is a
Cairo contextGdkPixmap is useful for
buffering and transforming R graphics.
For example, one could copy the pixmap to a GdkPixbuf
and add a watermark before saving as a gif, png, jpg, etc. One may also pass a Cairo context as the widget
parameter. This allows targeting arbitary Cairo surfaces. Note that
the context state is for the most part not cleared before plotting, so
transformations, etc, will remain in effect. Unlike Cairo, the R
graphics system requires bounds to be specified, which may be done
through the width and height parameters.
As a convenience, GtkPrintContext is also accepted as the
widget parameter. This makes it easy to redirect R graphics to a
printer selected and configured through the GTK+ printing dialogs.