bpostlethwaite

alexcjohnson

antrg

archmoj

chriddyp

hammadtheone

jmmease

nicolaskruchten

xhlu

andrefarzat

emmanuelle

rpkyle

verazabeida

harryturr

dmt0

jody_plotly

colormap

etpinard

maxkfranz

jackwluo

wilzbach

marivet

jackparmer

matthew_plotly

rmarren1

shammamah

shannon-lal

t4rk

vnieman

byronz

var colorScale = require('./colorScale');

    var indicies, rgba, fromrgba, torgba,

        nshades, colors, alpha, index, i,

        colormap = colormap.toLowerCase();

            throw Error(colormap + ' not a supported colorscale');

    } else if (Array.isArray(colormap)) {

        throw Error('unsupported colormap option', colormap);

            colormap+' map requires nshades to be at least size '+cmap.length

        if (typeof spec.alpha === 'number') {

            alpha = [spec.alpha, spec.alpha];

    } else if (spec.alpha.length !== 2) {

    // map index points from 0..1 to 0..n-1

        return Math.round(c.index * nshades);

    alpha[0] = Math.min(Math.max(alpha[0], 0), 1);

    alpha[1] = Math.min(Math.max(alpha[1], 0), 1);

    var steps = cmap.map(function(c, i) {

        // if user supplies their own map use it

        if (rgba.length === 4 && rgba[3] >= 0 && rgba[3] <= 1) {

        rgba[3] = alpha[0] + (alpha[1] - alpha[0])*index;

     * map increasing linear values between indicies to

    for (i = 0; i < indicies.length-1; ++i) {

        nsteps = indicies[i+1] - indicies[i];

        for (var j = 0; j < nsteps; j++) {

                Math.round(lerp(fromrgba[0], torgba[0], amt)),

                Math.round(lerp(fromrgba[1], torgba[1], amt)),

                Math.round(lerp(fromrgba[2], torgba[2], amt)),

                lerp(fromrgba[3], torgba[3], amt)

    colors.push(cmap[cmap.length - 1].rgb.concat(alpha[1]))

    if (format === 'hex') colors = colors.map( rgb2hex );

    else if (format === 'rgbaString') colors = colors.map( rgbaStr );

    else if (format === 'float') colors = colors.map( rgb2float );

        hex += ('00' + dig).substr( dig.length );

    return 'rgba(' + rgba.join(',') + ')';

  "description": "Great looking color maps",

    "build": "browserify example/example.js -o example/bundle.js",

    "url": "https://github.com/bpostlethwaite/colormap.git"

# colormap [![Build Status](https://travis-ci.org/bpostlethwaite/colormap.png)](https://travis-ci.org/bpostlethwaite/colormap)

[![npm install colormap](https://nodei.co/npm/colormap.png?mini=true)](https://npmjs.org/package/colormap/)

`colormap` | `'jet'` | Color map name from the image above or a custom color scale — a sequence of `{index, rgb}` objects, where index is `0..1` number and `rgb` is a length 3/4 array with values for the color stop.

`nshades` | `72` | Number of colors in returned array, the minimum number depends on `colormap`.

`format` | `'hex'` | `'hex'` for `#aabbcc`, `'rgbaString'` for `rgba(255, 255, 255, 1)`, `'rba'` for `[255, 255, 255, 1]`, `'float'` for `[1, 1, 1, 1]`.

`alpha` | `1` | Alpha range, can be an array with alpha values or just 2 values for start/end colors. |

Color maps are inspired by [matplotlib](https://github.com/d3/d3-scale#sequential-color-scales) color scales, [cmocean](https://github.com/matplotlib/cmocean) oceanographic colormaps, [cosine gradients](https://github.com/thi-ng/color/blob/master/src/gradients.org) and others. Thanks to authors of these libs for their invaluable work.

		@@ -17,9 +17,5 @@ /*
		*/
		var indicies, rgba, fromrgba, torgba,
		var indicies, fromrgba, torgba,
		nsteps, cmap, colormap, format,
		nshades, colors, alpha, index, i,
		r = [],
		g = [],
		b = [],
		a = [];
		nshades, colors, alpha, i;

		@@ -50,3 +46,3 @@ if ( !spec ) spec = {};

		if (cmap.length > nshades) {
		if (cmap.length > nshades + 1) {
		throw new Error(
		@@ -53,0 +49,0 @@ colormap+' map requires nshades to be at least size '+cmap.length

		{
		"name": "colormap",
		"version": "2.3.0",
		"version": "2.3.1",
		"description": "Great looking color maps",
		@@ -5,0 +5,0 @@ "author": "bpostlethwaite",

		@@ -13,3 +13,3 @@ # colormap [![Build Status](https://travis-ci.org/bpostlethwaite/colormap.png)](https://travis-ci.org/bpostlethwaite/colormap)
		let colors = colormap({
		colormap: 'jet'
		colormap: 'jet',
		nshades: 10,
		@@ -16,0 +16,0 @@ format: 'hex',

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