# panel.cloud

##### Default Panel Function for cloud

These are default panel functions controlling `cloud`

and
`wireframe`

displays.

- Keywords
- dplot

##### Usage

```
panel.cloud(x, y, subscripts, z,
groups = NULL,
perspective = TRUE,
distance = if (perspective) 0.2 else 0,
xlim, ylim, zlim,
panel.3d.cloud = "panel.3dscatter",
panel.3d.wireframe = "panel.3dwire",
screen = list(z = 40, x = -60),
R.mat = diag(4), aspect = c(1, 1),
par.box = NULL,
xlab, ylab, zlab,
xlab.default, ylab.default, zlab.default,
scales.3d,
proportion = 0.6,
wireframe = FALSE,
scpos,
...,
at)
panel.wireframe(...)
panel.3dscatter(x, y, z, rot.mat, distance,
groups, type = 'p',
xlim.scaled, ylim.scaled, zlim.scaled,
zero.scaled,
col, col.point, col.line,
lty, lwd, cex, pch,
cross, ..., subscripts)
panel.3dwire(x, y, z, rot.mat = diag(4), distance,
shade = FALSE,
shade.colors.palette = trellis.par.get("shade.colors")$palette,
light.source = c(0, 0, 1000),
xlim.scaled,
ylim.scaled,
zlim.scaled,
col = if (shade) "transparent" else "black",
lty = 1, lwd = 1,
alpha,
col.groups = superpose.fill$col,
polynum = 100,
...,
drape = FALSE,
at,
col.regions = regions$col,
alpha.regions = regions$alpha)
```

##### Arguments

- x, y, z
- numeric (or possibly factors) vectors representing the data to be
displayed. The interpretation depends on the context. For
`panel.cloud`

these are essentially the same as the data passed to the high level plot (except if`form`

- subscripts
- index specifying which points to draw. The same
`x, y, z`

values (representing the whole data) are passed to`panel.cloud`

for each panel.`subscripts`

specifies the subset of rows to be used for the particular - groups
- specification of a grouping variable, passed down from the high level functions.
- perspective
- logical, whether to plot a perspective view. Setting this to
`FALSE`

is equivalent to setting`distance`

to 0 - distance
- numeric, between 0 and 1, controls amount of perspective. The
distance of the viewing point from the origin (in the transformed
coordinate system) is
`1 / distance`

. This is described in a little more detail in the documentation for - screen
- A list determining the sequence of rotations to be applied to the data before being plotted. The initial position starts with the viewing point along the positive z-axis, and the x and y axes in the usual position. Each component of the list s
- R.mat
- initial rotation matrix in homogeneous coordinates, to be applied to
the data before
`screen`

rotates the view further. - par.box
- graphical parameters for box, namely, col, lty and lwd. By default
obtained from the parameter
`box.3d`

- xlim, ylim, zlim
- limits for the respective axes. As with other lattice functions, these could each be a numeric 2-vector or a character vector indicating levels of a factor.
- panel.3d.cloud, panel.3d.wireframe
- functions that draw the data-driven part of the plot (as opposed to
the bounding box and scales) in
`cloud`

and`wireframe`

. This function is called after the `back' of the bounding box is drawn, but before the `front' is - aspect
- aspect as in
`cloud`

- xlab, ylab, zlab
- Labels, have to be lists. Typically the user will not manipulate
these, but instead control this via arguments to
`cloud`

directly. - xlab.default
- for internal use
- ylab.default
- for internal use
- zlab.default
- for internal use
- scales.3d
- list defining the scales
- proportion
- numeric scalar, gives the length of arrows as a proportion of the sides
- scpos
- A list with three components x, y and z (each a scalar integer), describing which of the 12 sides of the cube the scales should be drawn. The defaults should be OK. Valid values are x: 1, 3, 9, 11; y: 8, 5, 7, 6 and z: 4, 2, 10, 12. (See comme
- wireframe
- logical, indicating whether this is a wireframe plot
- drape
- logical, whether the facets will be colored by height, in a manner
similar to
`levelplot`

. This is ignored if`shade=TRUE`

. - at, col.regions, alpha.regions
- deals with specification of colors when
`drape = TRUE`

in`wireframe`

.`at`

can be a numeric vector,`col.regions`

a vector of colors, and`alpha.regions`

- rot.mat
- 4x4 transformation matrix in homogeneous coordinates. This gives the
rotation matrix combining the
`screen`

and`R.mat`

arguments to`panel.cloud`

- type
- character vector, specifying type of cloud plot. Can include one or more of ``p'', ``l'', ``h'' or ``b''. ``p'' and ``l'' mean `points' and `lines' respectively, and ``b'' means `both'. ``h'' stands for `histogram', and causes a line to be dra
- xlim.scaled, ylim.scaled, zlim.scaled
- axis limits (after being scaled to the bounding box)
- zero.scaled
- z-axis location (after being scaled to the bounding box) of the X-Y
plane in the original data scale, to which lines will be dropped (if
within range) from each point when
`type = 'h'`

- cross
- logical, defaults to
`TRUE`

if`pch='+'`

.`panel.3dscatter`

can represent each point by a 3d `cross' of sorts (it's much easier to understand looking at an example than from a description). This is different fr - shade
- logical, indicating whether the surface is to be colored using an illumination model with a single light source
- shade.colors.palette
- a function (or the name of one) that is supposed to calculate the color of a facet when shading is being used. Three pieces of information is available to the function: first, the cosine of the angle between the incident light ray and the norm
- light.source
- a 3-vector representing (in cartesian coordinates) the light source. This is relative to the viewing point being (0, 0, 1/distance) (along the positive z-axis), keeping in mind that all observations are bounded within the [-0.5, 0.5] cube
- polynum
- quadrilateral faces are drawn in batches of
`polynum`

at a time. Drawing too few at a time increases the total number of calls to the underlying`grid.polygon`

function, which affects speed. Trying to draw too many at onc - col.groups
- colors for different groups
- col, col.point, col.line, lty, lwd, cex, pch, alpha
- graphical parameters
- ...
- other parameters, passed down when appropriate

##### Details

These functions together are responsible for the content drawn inside
each panel in `cloud`

and `wireframe`

.
`panel.wireframe`

is a wrapper to `panel.cloud`

, which does
the actual work.

`panel.cloud`

is responsible for drawing the content that does
not depend on the data, namely, the bounding box, the arrows/scales,
etc. At some point, depending on whether `wireframe`

is TRUE, it
calls either `panel.3d.wireframe`

or `panel.3d.cloud`

, which
draws the data-driven part of the plot.

The arguments accepted by these two functions are different, since
they have essentially different purposes. For cloud, the data is
unstructured, and `x, y, z`

are all passed to the
`panel.3d.cloud`

function. For wireframe, on the other hand,
`x`

and `y`

are increasing vectors with unique values,
defining a rectangular grid. `z`

must be a matrix with
`length(x) * length(y)`

rows, and as many columns as the number
of groups.

`panel.3dscatter`

is the default `panel.3d.cloud`

function.
It has a `type`

argument similar to `panel.xyplot`

,
and supports grouped displays. It tries to honour depth ordering,
i.e., points and lines closer to the camera are drawn later,
overplotting more distant ones. (Of course there is no absolute
ordering for line segments, so an ad hoc ordering is used. There is no
hidden point removal.)

`panel.3dwire`

is the default `panel.3d.wireframe`

function. It calculates polygons corresponding to the facets one by
one, but waits till it has collected information about `polynum`

facets, and draws them all at once. This avoids the overhead of
drawing `grid.polygon`

repeatedly, speeding up the rendering
considerably. If `shade = TRUE`

, these attempt to color the
surface as being illuminated from a light source at
`light.source`

. `palette.shade`

is a simple function that
provides the deafult shading colors

Multiple surfaces are drawn if `groups`

is non-null in the call
to `wireframe`

, however, the algorithm is not sophisticated
enough to render intersecting surfaces correctly.

##### See Also

*Documentation reproduced from package lattice, version 0.10-10, License: GPL version 2 or later*