cube_helix {destiny} | R Documentation

## Sequential color palette using the cube helix system

### Description

Creates a perceptually monotonously decreasing (or increasing) lightness color palette with different tones. This was necessary in pre-viridis times, by now you can probably just use `hcl.colors`

### Usage

    cube_helix(n = 6, start = 0, r = 0.4, hue = 0.8, gamma = 1,
      light = 0.85, dark = 0.15, reverse = FALSE)

    scale_colour_cube_helix(..., start = 0, r = 0.4, hue = 0.8,
      gamma = 1, light = 0.85, dark = 0.15, reverse = FALSE,
      discrete = TRUE, guide = if (discrete) "legend" else "colourbar")

    scale_color_cube_helix(..., start = 0, r = 0.4, hue = 0.8,
      gamma = 1, light = 0.85, dark = 0.15, reverse = FALSE,
      discrete = TRUE, guide = if (discrete) "legend" else "colourbar")

    scale_fill_cube_helix(..., start = 0, r = 0.4, hue = 0.8,
      gamma = 1, light = 0.85, dark = 0.15, reverse = FALSE,
      discrete = TRUE, guide = if (discrete) "legend" else "colourbar")

### Arguments

`n` | Number of colors to return (default: 6)
`start` | Hue to start helix at (\textrm{start} \in [0,3], default: 0)
`r` | Number of rotations of the helix. Can be negative. (default: 0.4)
`hue` | Saturation. 0 means greyscale, 1 fully saturated colors (default: 0.8)
`gamma` | Emphasize darker (gamma < 1) or lighter (gamma > 1) colors (default: 1)
`light` | Lightest lightness (default: 0.85)
`dark` | Darkest lightness (default: 0.15)
`reverse` | logical. If TRUE, reverse lightness (default: FALSE)
`...` | parameters passed to `discrete_scale` or `continuous_scale`
`discrete` | If TRUE, return a discrete scale, if FALSE a continuous one (default: TRUE)
`guide` | Type of scale guide to use. See `guides`

### Value

A `character` vector of hex colors with length `n`

### Examples

    palette(cube_helix())
    image(matrix(1:6), col = 1:6, pch = 19, axes = FALSE)

    cr <- scales::colour_ramp(cube_helix(12, r = 3))
    r <- runif(100)
    plot(1:100, r, col = cr(r), type = 'b', pch = 20)

[Package destiny version 3.0.1 Index]