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

knitr::opts_chunk$set(
  warning = FALSE,
  message = FALSE,
  collapse = TRUE,
  comment = "#>",
  fig.path = "man/figures/README-",
  out.width = "100%"
)

ggvwline

The goal of ggvwline is to to provide a set of geom functions that can be drawn with variable widths.

Installation

ggvwline is not on CRAN yet (but will probably at some point), you can install it from github:

## install.packages("devtools")
devtools::install_github("houyunhuang/ggvwline)

Example

library(ggplot2)
library(ggvwline)
library(grid)
df1 <- data.frame(
  x = c(0.2, 0.8), 
  y = c(2/3, 2/3))
df2 <- data.frame(
  x = c(0.2, 0.5, 0.8), 
  y = c(0.2, 0.5, 0.2))
width <- widthSpline(unit(c(12, 12, 25, 0), "mm"), d = c(0, 0.7, 0.7, 1),
                  shape = 0.01, rep = TRUE)

ggplot(df1, aes(x, y)) + 
  geom_brush_xspline(width0 = width) +
  geom_brush_xspline(data = df2, width0 = width) +
  coord_cartesian(xlim = c(0,1), ylim = c(0, 1))

df3 <- data.frame(x = c(0.2, 0.5, 0.8),
                   y = c(0.3, 0.7, 0.3))

arrowBrush <- list(x=c(-1, 1, -1, 0), y=c(-1, 0, 1, 0))
ggplot(df3, aes(x, y)) +
  geom_brush_xspline(brush = arrowBrush, spacing = 1:2) +
  geom_brush_xspline(width = 0.02, colour = 'grey40', fill = "grey40") +
  coord_cartesian(xlim = c(0.1, 0.9), ylim = c(0.2, 0.8))

t <- seq(0, 2 * pi, length.out = 45)[-45]
df4 <- data.frame(x = cos(t),
                  y = sin(t),
                  group = rep(LETTERS[1:4], each = 11))

width1 <- widthSpline(unit(c(0, 5, 12, 0), "mm"), d = c(0, 0.8, 0.8, 1),
                  shape = 0.01, rep = TRUE)
width2 <- widthSpline(unit(c(5, 5, 12, 0), "mm"), d = c(0, 0.8, 0.8, 1),
                  shape = 0.01, rep = TRUE)

ggplot(df4, aes(x, y, group = group, fill = group)) + 
  geom_brush_xspline(width0 = width1) +
  coord_fixed(xlim = c(-1.1, 1.1), ylim = c(-1.1, 1.1))

ggplot(df4, aes(x, y, group = group, fill = group)) + 
  geom_brush_xspline(width0 = width2) +
  coord_fixed(xlim = c(-1.1, 1.1), ylim = c(-1.1, 1.1))