Add additional dimensionality to visualizations by using the color and/or
fill aesthetics to convey the values of two continuous variables each. By
projecting variable values onto YUV color space, a scale is created that
allows viewers to intuitively determine the values of both variables from the
single displayed color. Includes two new scales and a new guide for ggplot2.
scale_color_colorplane for usage.
guide_colorplane will only function when the colorplaner
package is attached to the search list. For scripting or interactive use,
library(colorplaner). For package development, add colorplaner
to the Depends list in your DESCRIPTION file.
This requirement exists because ggplot2 guides function through the use of S3 generics and methods, but the generic functions are not exported from the ggplot package. Without access to the generics, the methods for the colorplane guide cannot be properly registered and will only be found by the dispatcher if in the search path.
Check https://github.com/wmurphyrd/colorplaner/issues/27 for current status and progress towards resolving this issue.
Layers now produce a warning message when unrecognized aesthetics are found
but have no mechanism for notifying them of aesthetics handled by scales.
The warning can be avoided by mapping
fill2 at the plot
level (i.e. in the initial
ggplot() statement). If you want to avoid
colorplane mapping on all layers, map
fill only on the
layers you want, as in the example below.
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