Arrange over-plotted points in a sunflower pattern

This function applies the sunflower algorithm, executed by the sunflower() function, as a position adjustment, arranging overlapping points at any given x and y into a sunflower pattern. See the sunflower() documentation for more information.

Usage

position_sunflower(density = 1, aspect_ratio = 1)

Arguments

density

The pattern density, which defaults to 1 but will have to be adjusted in most cases. The desirable density will depend on both the ranges of the axes and the dimensions of the image.

aspect_ratio

An aspect ratio adjustment to compensate for distortion of the circular arrangement, which might occur when plotting if coord_equal() is not used. A wide aspect ratio (eg. 2) would adjust for vertical stretching, whereas a tall aspect ratio (eg. 0.5) would adjust for horizontal stretching. The default aspect ratio of 1 is appropriate when no adjustment is required.

Value

A ggproto object of class PositionSunflower.

See also

Other Functions: position_circlepack(), position_circlepackdodge(), position_jitter_ellipse(), position_jitterdodge_ellipse(), position_sunflowerdodge(), sunflower()

Examples

  library(ggplot2)

  # Use the sunflower position function to arrange N points
  N <- 100

  dat <- data.frame(
    x = rep(1:4, times = N),
    y = rep(1:4, times = N)
  )

  ggplot(dat, aes(x = x, y = y)) +
    geom_point(size = 1, position = position_sunflower(density = 1, aspect_ratio = 1)) +
    xlim(0, 5) +
    ylim(0, 5) +
    coord_equal()