colorGrad: Color Gradient

In egenn/rtemis: Machine Learning and Visualization

Color Gradient

Description

Create a gradient of colors and optionally a colorbar

Usage

colorGrad(
  n = 21,
  colors = NULL,
  space = c("rgb", "Lab"),
  lo = "#18A3AC",
  lomid = NULL,
  mid = NULL,
  midhi = NULL,
  hi = "#F48024",
  preview = FALSE,
  colorbar = FALSE,
  cb.n = 21,
  cb.mar = c(1, 1, 1, 1),
  cb.add = FALSE,
  cb.add.mar = c(5, 0, 2, 5),
  cb.axis.pos = 1.1,
  cb.axis.las = 1,
  cb.axis.hadj = 0,
  cb.cex = 6,
  bar.min = -1,
  bar.mid = 0,
  bar.max = 1,
  cex = 1.2,
  filename = NULL,
  pdf.width = 3,
  pdf.height = 7,
  theme = getOption("rt.theme", "light"),
  bg = NULL,
  col.text = NULL,
  plotlycb = FALSE,
  plotly.width = 80,
  plotly.height = 500,
  rtrn.plotly = FALSE,
  margins = c(0, 0, 0, 0),
  pad = 0,
  par.reset = TRUE
)

Arguments

n	Integer: How many distinct colors you want. If not odd, converted to n + 1 Defaults to 21
colors	Character: Acts as a shortcut to defining lo, mid, etc for a number of defaults: "french", "penn", "grnblkred",
space	Character: Which colorspace to use. Option: "rgb", or "Lab". Default = "rgb". Recommendation: If mid is "white" or "black" (default), use "rgb", otherwise "Lab"
lo	Color for low end
lomid	Color for low-mid
mid	Color for middle of the range or "mean", which will result in colorOp(c(lo, hi), "mean"). If mid = NA, then only lo and hi are used to create the color gradient.
midhi	Color for middle-high
hi	Color for high end
preview	Logical: Plot the colors horizontally
colorbar	Logical: Create a vertical colorbar
cb.n	Integer: How many steps you would like in the colorbar
cb.mar	Vector, length 4: Colorbar margins. Default: c(1, 1, 1, 1)
cb.add	Logical: If TRUE, colorbar will be added to existing plot
cb.add.mar	Vector: Margins for colorbar (See par("mar"))
cb.axis.pos	Float: Position of axis (See axis("pos"))
cb.axis.las	Integer 0,1,2,3: Style of axis labels. 0: Always parallel to the axis, 1: Horizontal, 2: Perpendicular, 3: Vertical. Default = 1
cb.axis.hadj	Float: Adjustment parallel to the reading direction (See par("adj"))
cb.cex	FLoat: Character expansion factor for colorbar (See par("cex"))
bar.min	Numeric: Lowest value in colorbar
bar.mid	Numeric: Middle value in colorbar
bar.max	Numeric: Max value in colorbar
cex	Float: Character expansion for axis
filename	String (Optional: Path to file to save colorbar
pdf.width	Float: Width for PDF output. Default = 3
pdf.height	Float: Height for PDF output. Default = 7
theme	Character: "light", "dark"
bg	Color: Background color
col.text	Color: Colorbar text color
plotlycb	Logical: Create colorbar using plotly (instead of base R graphics)
plotly.width	Float: Width for plotly colorbar. Default = 80
plotly.height	Float: Height for plotly colorbar. Default = 500
rtrn.plotly	Logical: If TRUE, return plotly object
margins	Vector: Plotly margins. Default = c(0, 0, 0, 0)
pad	Float: Padding for plotly. Default = 0
par.reset	Logical: If TRUE (Default), reset par settings after running

Details

It is best to provide an odd number, so that there is always an equal number of colors on either side of the midpoint. For example, if you want a gradient from -1 to 1 or equivalent, an n = 11, will give 5 colors on either side of 0, each representing a 20\

colors can be defined as a sequence of 3-letter color abbreviations of 2, 3, 4, or 5 colors which will correspond to values: {"lo","hi"}; {"lo", "mid", "hi"}; {"lo", "mid", "midhi", "hi"}, and {"lo", "lomid", "mid", "midhi", "hi"}, respectively. For example, try colorGrad(21, "blugrnblkredyel", colorbar = TRUE) 3-letter color abbreviations: wht: white; blk: black; red; grn: green; blu: blue; yel: yellow; rng: orange; prl: purple

Value

Invisible vector of hexadecimal colors / plotly object if rtrn.plotly = TRUE

Author(s)

E.D. Gennatas

egenn/rtemis documentation built on April 24, 2024, 6:58 p.m.