rescaler_bezier: Bézier rescaler

In ijlyttle/colorpath: Build Color Paths

Bézier rescaler

Description

Use this function to rescale a palette function, for example: clip a certain part of it.

Usage

rescaler_bezier(mat_luv, n = 21)

Arguments

mat_luv	matrix of LUV coordinates, control-points for Bézier spline.
n	numeric if rescale_path, number of equally-spaced Bézier points to calculate.

Details

A rescaler function:

• must accept input between zero and one.

• must provide an output between zero and one.

• the output must to vary monotonically with the input.

Use rescaler_linear() create a new palette-function that uses part of the range of an existing palette-function.

Use rescaler_bezier() to rescale a Bézier palette-function to be more perceptually uniform. This uses fits a spline to equally-spaced points on the colorpath. The Bézier function makes some optimization calculations, so it may take a few seconds to run.

Value

A function with S3 class cpath_rescaler.

Examples

  # Input rescaler
  rlin <- rescaler_x(c(0.25, 0.75))

  # print for a preview
  print(rlin)

  # evaluate
  rlin(c(0, 0.5, 1))

  # Luminance rescaler
  pal_luv_blues <- pal_luv_bezier(mat_luv_blues)
  rlum <- rescaler_lum(c(40, 70), pal_luv_blues)

  # print for a preview
  print(rlum)

  # evaluate
  rlum(c(0, 0.5, 1))

ijlyttle/colorpath documentation built on Sept. 13, 2022, 7:44 p.m.