DatumHuePlatform v0.0.24datumhue.com
Contents

handle2 methods, 1 field

ColorScale

A numeric → color ramp created by datumhue.chart.scale.color(options). Drives per-row color on data-bound marks via the color_column option.

Obtained from
datumhue.chart.scale.color, datumhue.chart.scale.color_category
Accepted by
PlotArea:line, PlotArea:points, PlotArea:area, PlotArea:heatmap, PlotArea:histogram2d, PlotArea:legend

The examples on this page start from:

lua
local color = datumhue.color
local ramp = datumhue.chart.scale.color({
    colors = { color("#2d353b"), color("#a7c080") },
})

Fields 1

FieldTypeAccessDescription
domaintable | "auto" | nilread/writeDomain {min = N, max = N}, or nil while pending. Assign {min = N, max = N} or "auto".
Example
-- A ramp maps nothing until its domain is set or fitted to a mark.
print(ramp:map(5)) --> nil
ramp.domain = { min = 0, max = 10 }
local c = ramp:map(5)
print(string.format("%.2f %.2f %.2f", c.r, c.g, c.b)) --> 0.40 0.47 0.37

Methods 2

ColorScale:map

method
ColorScale:map(value: number | string) -> Color?

Ramp scales: interpolated color at a numeric value, or nil while pending. Category scales: the category's color (a string registers first-seen; a number is a 0-based index).

Example
-- A category scale takes a name, or a 0-based index into its list.
local ovens = datumhue.chart.scale.color_category({
    categories = { "North", "South" },
    colors = { color("#7fbbb3"), color("#e69875") },
})
print(ovens:map(1) == ovens:map("South")) --> true

ColorScale:remove

method
ColorScale:remove()

Destroy the color scale.

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Victor Mono is licensed under the SIL Open Font License 1.1
Copyright (c) 2024, Rune Bjørnerås (https://github.com/rubjo)

This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL


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SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
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