plot.cpr_cn {cpr}

Plotting Control Nets

Description

Three-dimensional plots of control nets and/or surfaces

Usage

## S3 method for class 'cpr_cn'
plot(
  x,
  ...,
  xlab = "",
  ylab = "",
  zlab = "",
  show_net = TRUE,
  show_surface = FALSE,
  get_surface_args,
  net_args,
  surface_args,
  rgl = TRUE
)

Arguments

x

a cpr_cn object

...

common arguments which would be used for both the plot of the control net and the surface, e.g., xlim, ylim, zlim.

xlab, ylab, zlab

labels for the axes.

show_net

logical, show the control net

show_surface

logical, show the tensor product surface

get_surface_args

a list of arguments passed to the get_surface call. This call generates the needed data sets used in the plotting.

net_args

arguments to be used explicitly for the control net. Ignored if show_net = FALSE.

surface_args

arguments to be used explicitly for the surface. Ignored if show_surface = FALSE.

rgl

If TRUE, the default, generate use rgl::persp3d to generate the graphics. If FALSE, use plot3D::persp3D to generate the graphics.

Details

This plotting method generates three-dimensional plots of the control net, surface, or both, for a cpr_cn objects. The three-dimensional plots are generated by either persp3D form the plot3D package or persp3d from the rgl package. rgl graphics may or may not work on your system depending on support for OpenGL.

Building complex and customized graphics might be easier for you if you use get_surface to generate the needed data for plotting. See vignette(topic = "cnr", package = "cpr") for examples of building different plots.

For rgl graphics, the surface_args and net_args are lists of rgl.material and other arguments passed to persp3d. Defaults are col = "black", front = "lines", back = "lines" for the net_args and col = "grey20", front = "fill", back = "lines" for the surface_args.

For plot3D graphics there are no defaults values for the net_args and surface_args.

Value

the plotting data needed to generate the plot is returned invisibly.

See Also

plot.cpr_cp for plotting control polygons and splines, persp3d and rgl.material for generating and controlling rgl graphics. persp3D for building plot3D graphics. get_surface for generating the data sets needed for the plotting methods.

vignette(topic = "cnr", package = "cpr")

Examples

 acn <- cn(log10(pdg) ~ btensor(  x = list(day, age)
                                , df = list(30, 4)
                                , bknots = list(c(-1, 1), c(44, 53)))
           , data = spdg)

# plot3D
plot(acn, rgl = FALSE)

# rgl
if (require(rgl)) {
  plot(acn, rgl = TRUE)
}