lattice (version 0.19-30)

F_1_panel.levelplot: Panel Functions for levelplot and contourplot

Description

These are the default panel functions for levelplot and contourplot. Also documented is an alternative raster-based panel function for use with levelplot.

Usage

panel.levelplot(x, y, z, 
                subscripts,
                at = pretty(z),
                shrink,
                labels,
                label.style = c("mixed", "flat", "align"),
                contour = FALSE,
                region = TRUE,
                col = add.line$col,
                lty = add.line$lty,
                lwd = add.line$lwd,
                border = "transparent",
                ...,
                col.regions = regions$col,
                alpha.regions = regions$alpha,
                identifier = "levelplot")
panel.contourplot(...)
panel.levelplot.raster(x, y, z, 
                       subscripts,
                       at = pretty(z),
                       ...,
                       col.regions = regions$col,
                       alpha.regions = regions$alpha,
                       interpolate = FALSE,
                       identifier = "levelplot")

Details

The same panel function is used for both levelplot and contourplot (which differ only in default values of some arguments). panel.contourplot is a simple wrapper to panel.levelplot.

When contour=TRUE, the contourLines function is used to calculate the contour lines.

panel.levelplot.raster is an alternative panel function that uses the raster drawing abilities in R 2.11.0 and higher (through grid.raster). It has fewer options (e.g., can only render data on an equispaced grid), but can be more efficient. When using panel.levelplot.raster, it may be desirable to render the color key in the same way. This is possible, but must be done separately; see levelplot for details.

See Also

levelplot, level.colors, contourLines

Examples

require(grid)

levelplot(rnorm(10) ~ 1:10 + sort(runif(10)), panel = panel.levelplot)

suppressWarnings(plot(levelplot(rnorm(10) ~ 1:10 + sort(runif(10)),
                                panel = panel.levelplot.raster,
                                interpolate = TRUE)))

levelplot(volcano, panel = panel.levelplot.raster)

levelplot(volcano, panel = panel.levelplot.raster,
          col.regions = topo.colors, cuts = 30, interpolate = TRUE)