geom_shading_bar {plothelper}

Geom Layer for Drawing Shading Barplot

Description

This function is similar to geom_bar(aes(x, y), stat="identity") except that it draws bars with shading colors. Unlike gg_shading_bar which is a convenient function, this function is used as a ggplot layer. Accepted properties are different from those in geom_multi_raster and gg_shading_bar.

• (1) x. It is the same as that in geom_bar.

• (2) y. It is the same as that in geom_bar.

• (3) raster. It should be a list with 1 or more character vectors of colors. If the list only has 1 vector, all the bars will use the same shading pattern. If you have, for example, 5 bars to draw, then you have to put 5 vectors of colors into a list. If you use a data frame, it must be a data frame made by package tibble, and the column for raster should be a list.

• (4) width. It is the same as that in geom_bar.

• (5) flip. The default is FALSE. You only need to use TRUE when you use coord_flip. Use outside the aes(...) function.

• (6) modify_raster. If it is TRUE (default), colors will be smoothed using the value of smooth. If raster has enough colors, you can set this to FALSE. It is the same as that in gg_shading_bar.

• (7) equal_scale. The default is FALSE. When it is TRUE, a bar will use a certain part of the shading colors according to a global scale. It is the same as that in gg_shading_bar.

• (8) smooth. The default is 15. The number of shading colors each bar has. The bigger, the better. It is the same as that in gg_shading_bar.

• (9) space. The color space that is used. It can be "rgb" (default) or "Lab".

• (10) orientation. This parameter mimics the same parameter used in geom_bar, though acts differently. This enables to flip the x axis and y axis without using coord_flip. If it is NA or "x" (default), it supposes x = SOME LABELS and y = SOME VALUES. If it is "y", you must set x = SOME VALUES and y = SOME LABELS. These effects are the same as geom_bar.

NOTE: the function does interpolation as default, so you does not need to use interpolate parameter. And, unlike gg_shading_bar, this function does not draw lines around rectangles.

Usage

geom_shading_bar(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  width = 0.9,
  flip = FALSE,
  modify_raster = TRUE,
  smooth = 15,
  equal_scale = FALSE,
  space = "rgb",
  orientation = "x",
  ...
)

Arguments

mapping

aes mapping.

data

data. It should be a tbl object.

stat

stat.

position

position. The parameter will not be used here.

na.rm

logical, whether to remove NA values.

show.legend

This will not be used because the layer does not create any legend.

inherit.aes

logical, whether to inherit aes from ggplot().

width

see description.

flip

see description.

modify_raster

see description or gg_shading_bar.

smooth

see description.

equal_scale

see description or gg_shading_bar.

space

see description.

orientation

see description.

...

additional parameters.

Examples

# Example 1: use vectors.
x=c("b", "a", "c", "d", "e")
y=c(2, 1, 3, 5, 4)
raster=list(c("blue", "red"), c("green", "orange"), 
	c("cyan", "yellow"), c("purple", "orangered"), c("grey", "red"))
ggplot()+
	geom_shading_bar(aes(x=x, y=y, raster=raster), smooth=40)
#
# Example 2: other parameters
x=1: 5
y=c(1, 2, -3, 5, 4)
raster=list(c("blue", "red"))
ggplot()+
	geom_shading_bar(aes(x=x, y=y, raster=raster), 
		smooth=50, width=0.6, equal_scale=TRUE)+
	scale_x_continuous(breaks=1: 5, labels=letters[1: 5])