geometry_warp: Warp a path or polygon with adaptive resampling

In rstudio/gggeom: Graphical Geometry

Description

This recursively split each line segment into pieces until the transformed point is less that tolerance away from the transformed line segment.

Usage

geometry_warp(geom, fun = c("polar", "identity"), tolerance = NULL)

Arguments

geom	A geometry data frame.
fun	A warping function to use. Currently these are hard coded because they much be implemented in C++ for performance reasons.
tolerance	Approximation errors below this threshold will be ignored. If NULL, attempts to guess a reasonable value.

Examples

spiral <- data.frame(
  x = seq(0, 6 * pi, length = 10),
  y = seq(0, 1, length = 10)
)
path <- render_path(spiral, ~x, ~y)
path %>% plot() %>% points()

path %>% geometry_warp("polar") %>% plot()
path %>% geometry_warp("polar", tolerance = 0.1) %>% plot() %>% points()

# Crazy example
expand.grid(x = seq(0, pi, length = 4), y = 0:3) %>%
  render_tile(~x, ~y, halign = 0, valign = 0) %>%
  geometry_pointificate() %>%
  geometry_rotate(15) %>%
  geometry_warp("polar") %>%
  plot()

rstudio/gggeom documentation built on May 28, 2019, 4:35 a.m.