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d3-scale-chromatic

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d3-scale-chromatic

Sequential, diverging and categorical color schemes.


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2
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Package description

What is d3-scale-chromatic?

The d3-scale-chromatic package provides color schemes designed to work with d3-scale's sequential, diverging, and categorical color scales. It includes a variety of color palettes that can be used for data visualization, such as for mapping data values to colors in charts and graphs.

What are d3-scale-chromatic's main functionalities?

Sequential Color Schemes

Sequential color schemes are ideal for displaying ordered data that progresses from low to high. The package provides a variety of single-hue and multi-hue color schemes.

import { scaleSequential } from 'd3-scale';
import { interpolateBlues } from 'd3-scale-chromatic';

const colorScale = scaleSequential(interpolateBlues).domain([0, 100]);
console.log(colorScale(50)); // Outputs a color from the 'Blues' sequential color scheme

Diverging Color Schemes

Diverging color schemes are used to visualize data that diverges from a median value, with contrasting colors on either side. This is useful for highlighting deviation from a midpoint.

import { scaleDiverging } from 'd3-scale';
import { interpolatePiYG } from 'd3-scale-chromatic';

const colorScale = scaleDiverging(interpolatePiYG).domain([0, 50, 100]);
console.log(colorScale(50)); // Outputs the middle color from the 'PiYG' diverging color scheme

Categorical Color Schemes

Categorical color schemes are used for discrete data that falls into distinct categories. The package provides several categorical color palettes with a fixed number of colors.

import { scaleOrdinal } from 'd3-scale';
import { schemeCategory10 } from 'd3-scale-chromatic';

const colorScale = scaleOrdinal(schemeCategory10);
console.log(colorScale('category1')); // Outputs a color from the 'Category10' categorical color scheme

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d3-scale-chromatic

This module provides sequential, diverging and categorical color schemes designed to work with d3-scale’s scaleOrdinal and scaleSequential. Most of these schemes are derived from Cynthia A. Brewer’s ColorBrewer. Since ColorBrewer publishes only discrete color schemes, the sequential and diverging scales are interpolated using uniform B-splines.

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Last updated on 12 Mar 2024

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