getLatticeLegend: Get the nodes corresponding to the legend in a lattice plot

In duncantl/SVGAnnotation: Tools for post-processing SVG plots created in R

Description

This function uses heuristics to find the SVG nodes corresponding to the legend generated via the auto.key parameter in a lattice plot. One can then use this to annotate the SVG, e.g. put links or mouseover handlers on the labels.

Usage

getLatticeLegendNodes(doc, plotRegions = getPlotRegionNodes(doc), which = NA)

Arguments

doc	the parsed SVG document, i.e. an object of class XMLInternalDocumet
plotRegions	typically not specified, but this allows the caller to identify the plot region nodes.
which	if specified, an integer identifying which legend is of interest. This is for the case where there is more than one legend/key in the plot, i.e. via the legend argument.

Value

A list of XMLInternalNode objects.

Author(s)

Duncan Temple Lang

See Also

svgPlot xmlParse the lattice package.

Examples

 library(lattice)
 d = data.frame(x = runif(100), y = runif(100),
                type = sample(c("A", "B", "C"), 100, replace = TRUE),
                g = sample(c("w", "x", "y", "z"), 100, replace = TRUE))
 doc = svgPlot(xyplot(y ~ x | type, d, groups = g, auto.key = TRUE))
 nodes = getLatticeLegendNodes(doc)
 length(nodes)

duncantl/SVGAnnotation documentation built on May 15, 2019, 5:57 p.m.