Helper to convert `IFC_plot` to 'raster' plot.
plot_raster(obj, pntsonedge = FALSE)
an object of class `IFC_plot` as created by plotGraph
.
whether points outside of plotting region should be bounded on the edge. Default is FALSE to clip points. NA can be used to produce hybrid display, with plot being drawn with `pntsonedge` = FALSE on top of plot with `pntsonedge` = TRUE.