Description Usage Arguments Details Value References See Also Examples
Functions to define how variables are mapped into color space.
Used for the color_projection
argument to
scale_color_colorplane
and
scale_fill_colorplane
. Custom functions can also be defined
following this signature.
1 2 3 4 5 | YUV_projection(x, y, Y = 0.3)
red_blue_projection(x, y)
interpolate_projection(x, y, zero_color, horizontal_color, vertical_color)
|
x, y |
numeric vectors of equal length containing the values to be mapped to the horizontal and vertical axes of the colorplane. |
Y |
numeric value in range 0 to 1 for the fixed luminosity level in YUV projections. |
zero_color, horizontal_color, vertical_color |
Character strings specifying R colors to use in interpolation projections. See Details. |
Color space projection functions take two numeric vectors and return
a single character vector of the same length that specifies the colors to
plot in the form "#rrggbb", as returned by rgb
.
Additional projection functions can be defined following the same signature
and passed to the color_projection
argument of the
scale_*_colorplane
scale constructors. When writing custom
projection functions, expect two arguments that are numeric vectors scaled
to a range of 0 to 1 and that do not contain missing values. Custom
projections can accept additional arguments that are passed through from
the ...
of scale_*_colorplane
.
For interpolate_projection
, a color space is created via
linear RGB-space interpolation for each axis and then blending by averages.
zero_color
is the base color when both x
and y
are
minimal. horizontal_color
specified the color to interpolate towards
for increasing x
values and vertical_color
for y
. The
plotted color will be a simple average of the interpolated x
and
y
values.
Character vector of colors of the same length as x
and
y
.
YUV conversion matrix from https://en.wikipedia.org/wiki/YUV. UV limits sourced from Deveroux VG. Limiting of YUV Video Signals. British Broadcasting System. 1987 .
scale_color_colorplane
,
scale_fill_colorplane
1 2 3 4 5 6 7 | library(ggplot2)
ggplot(mtcars, aes(x = wt, y = mpg, color = disp, colour2 = hp)) +
geom_point() +
scale_color_colorplane(color_projection = interpolate_projection,
zero_color = "darkorange2",
horizontal_color = "mediumspringgreen",
vertical_color = "magenta")
|
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