gridCellEnhance: Add Grid Lines and Centers in Package "sampSurf"
In sampSurf: Sampling Surface Simulation for Areal Sampling Methods

Description Usage Arguments Details Value Author(s) See Also Examples

This routine is found within several of the plotting methods for objects of class "Tract" or it subclasses. In these methods, the arguments detailed below are passed as part of the "..." list. It can, however, also be used as a stand-alone function if desired, and applied to an existing plot of “Tract” objects, or objects that contain a “Tract” object, such as those of class "sampSurf". Lastly, it is used directly in plotting objects of class "InclusionZoneGrid" of subclasses.

gridCellEnhance(tract,
                gridLines = FALSE,
                gridCenters = FALSE,
                gridLineColor = .StemEnv$gridLineColor,
                gridCenterColor = .StemEnv$gridCenterColor,
                lwdGrid = 1, ...)

`tract`	An object of class “Tract” or subclass.
`gridLines`	`TRUE`: plot grid lines; `FALSE`: no grid lines.
`gridCenters`	`TRUE`: plot grid cell centers; `FALSE`: no grid cell centers.
`gridLineColor`	An R color for the grid lines.
`gridCenterColor`	An R color for the grid cell centers.
`lwdGrid`	The line width specification in the form of the `lwd` `par` parameter, for the grid lines.
`...`	Arguments to be ignored at present.

A valid plot must have been constructed first for the “Tract” object as the embellishments will be added to it. This should probably only be used on small areas, since the lines or centers will overlap for large areas or high resolution objects.

Invisibly.

Jeffrey H. Gove

plot-methods

#
# apply it after plotting a sampling surface...
#
tr = Tract(c(x=50,y=50), cellSize=0.5)
btr = bufferedTract(10, tr)
ssSA = sampSurf(2, btr, iZone = 'sausageIZ', plotRadius=3,
       buttDiam=c(20,40))
plot(ssSA, axes=TRUE)
gridCellEnhance(ssSA@tract, gridLines=TRUE)

#
# on a tract only...
#
plot(btr, axes=TRUE, gridCenters=TRUE)