geom_brush_xspline: X-Spline Curve with Brush

In houyunhuang/ggvwline: Extending 'ggplot2' to Draw Variable-Width Lines

Description

The main curve is described by x/y position points and a variable-size brush is used to sweep a variable-width line from the main curve.

Usage

geom_brush_xspline(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  ...,
  open = TRUE,
  width_units = "cm",
  width_shape = -1,
  rep = FALSE,
  shape = 1,
  debug = FALSE,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

Arguments

mapping	Set of aesthetic mappings created by aes() or aes_(). If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.
data	The data to be displayed in this layer. There are three options: If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot(). A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame. See fortify() for which variables will be created. A function will be called with a single argument, the plot data. The return value must be a data.frame, and will be used as the layer data. A function can be created from a formula (e.g. ~ head(.x, 10)).
stat	The statistical transformation to use on the data for this layer, as a string.
position	Position adjustment, either as a string, or the result of a call to a position adjustment function.
...	Other arguments passed on to layer(). These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. They may also be parameters to the paired geom/stat.
open	a logical value indicating whether to connect the last location back to the first location to produce a closed line.
width_units	the units of line, details see unit.
width_shape	the shape parameter for the width spline.
rep	a logical value indicating whether to repeat the widths along the full length of the line.
shape	a numeric value (or one per location) that controls the shape of the X-spline curve relative to the locations.
debug	a logical value indicating whether to produce graphical debugging output.
na.rm	If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.
show.legend	logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes. It can also be a named logical vector to finely select the aesthetics to display.
inherit.aes	If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders().

Aesthetics

geom_brush_xspline() understands the following aesthetics (required aesthetics are in bold):

• x

• y

• angle

• alpha

• colour

• dist

• fill

• linetype

• size

• space

• width

See Also

brushXsplineGrob, widthSpline, BezierWidth.

Examples

df <- data.frame(
  x = 0:3 / 3,
  y = c(0.5, 0.7, 0.3, 0.5),
  width = c(1.5, 0, 1.5, 0)
)

ggplot(df, aes(x, y, width = width)) + geom_brush_xspline()

width <- widthSpline(grid::unit(c(0, 1, 0), "cm"), d=1:3 / 4, rep = TRUE)
ggplot(df, aes(x, y)) + geom_brush_xspline(width0 = width)

houyunhuang/ggvwline documentation built on March 10, 2020, 6:05 p.m.