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colormap.js
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colorScale = {
"jet":[{"index":0,"rgb":[0,0,131]},{"index":0.125,"rgb":[0,60,170]},{"index":0.375,"rgb":[5,255,255]},{"index":0.625,"rgb":[255,255,0]},{"index":0.875,"rgb":[250,0,0]},{"index":1,"rgb":[128,0,0]}],
"hsv":[{"index":0,"rgb":[255,0,0]},{"index":0.169,"rgb":[253,255,2]},{"index":0.173,"rgb":[247,255,2]},{"index":0.337,"rgb":[0,252,4]},{"index":0.341,"rgb":[0,252,10]},{"index":0.506,"rgb":[1,249,255]},{"index":0.671,"rgb":[2,0,253]},{"index":0.675,"rgb":[8,0,253]},{"index":0.839,"rgb":[255,0,251]},{"index":0.843,"rgb":[255,0,245]},{"index":1,"rgb":[255,0,6]}],
"hot":[{"index":0,"rgb":[0,0,0]},{"index":0.3,"rgb":[230,0,0]},{"index":0.6,"rgb":[255,210,0]},{"index":1,"rgb":[255,255,255]}],
"cool":[{"index":0,"rgb":[0,255,255]},{"index":1,"rgb":[255,0,255]}],
"spring":[{"index":0,"rgb":[255,0,255]},{"index":1,"rgb":[255,255,0]}],
"summer":[{"index":0,"rgb":[0,128,102]},{"index":1,"rgb":[255,255,102]}],
"autumn":[{"index":0,"rgb":[255,0,0]},{"index":1,"rgb":[255,255,0]}],
"winter":[{"index":0,"rgb":[0,0,255]},{"index":1,"rgb":[0,255,128]}],
"bone":[{"index":0,"rgb":[0,0,0]},{"index":0.376,"rgb":[84,84,116]},{"index":0.753,"rgb":[169,200,200]},{"index":1,"rgb":[255,255,255]}],
"copper":[{"index":0,"rgb":[0,0,0]},{"index":0.804,"rgb":[255,160,102]},{"index":1,"rgb":[255,199,127]}],
"greys":[{"index":0,"rgb":[0,0,0]},{"index":1,"rgb":[255,255,255]}],
"yignbu":[{"index":0,"rgb":[8,29,88]},{"index":0.125,"rgb":[37,52,148]},{"index":0.25,"rgb":[34,94,168]},{"index":0.375,"rgb":[29,145,192]},{"index":0.5,"rgb":[65,182,196]},{"index":0.625,"rgb":[127,205,187]},{"index":0.75,"rgb":[199,233,180]},{"index":0.875,"rgb":[237,248,217]},{"index":1,"rgb":[255,255,217]}],
"greens":[{"index":0,"rgb":[0,68,27]},{"index":0.125,"rgb":[0,109,44]},{"index":0.25,"rgb":[35,139,69]},{"index":0.375,"rgb":[65,171,93]},{"index":0.5,"rgb":[116,196,118]},{"index":0.625,"rgb":[161,217,155]},{"index":0.75,"rgb":[199,233,192]},{"index":0.875,"rgb":[229,245,224]},{"index":1,"rgb":[247,252,245]}],
"yiorrd":[{"index":0,"rgb":[128,0,38]},{"index":0.125,"rgb":[189,0,38]},{"index":0.25,"rgb":[227,26,28]},{"index":0.375,"rgb":[252,78,42]},{"index":0.5,"rgb":[253,141,60]},{"index":0.625,"rgb":[254,178,76]},{"index":0.75,"rgb":[254,217,118]},{"index":0.875,"rgb":[255,237,160]},{"index":1,"rgb":[255,255,204]}],
"bluered":[{"index":0,"rgb":[0,0,255]},{"index":1,"rgb":[255,0,0]}],
"rdbu":[{"index":0,"rgb":[5,10,172]},{"index":0.35,"rgb":[106,137,247]},{"index":0.5,"rgb":[190,190,190]},{"index":0.6,"rgb":[220,170,132]},{"index":0.7,"rgb":[230,145,90]},{"index":1,"rgb":[178,10,28]}],
"picnic":[{"index":0,"rgb":[0,0,255]},{"index":0.1,"rgb":[51,153,255]},{"index":0.2,"rgb":[102,204,255]},{"index":0.3,"rgb":[153,204,255]},{"index":0.4,"rgb":[204,204,255]},{"index":0.5,"rgb":[255,255,255]},{"index":0.6,"rgb":[255,204,255]},{"index":0.7,"rgb":[255,153,255]},{"index":0.8,"rgb":[255,102,204]},{"index":0.9,"rgb":[255,102,102]},{"index":1,"rgb":[255,0,0]}],
"rainbow":[{"index":0,"rgb":[150,0,90]},{"index":0.125,"rgb":[0,0,200]},{"index":0.25,"rgb":[0,25,255]},{"index":0.375,"rgb":[0,152,255]},{"index":0.5,"rgb":[44,255,150]},{"index":0.625,"rgb":[151,255,0]},{"index":0.75,"rgb":[255,234,0]},{"index":0.875,"rgb":[255,111,0]},{"index":1,"rgb":[255,0,0]}],
"portland":[{"index":0,"rgb":[12,51,131]},{"index":0.25,"rgb":[10,136,186]},{"index":0.5,"rgb":[242,211,56]},{"index":0.75,"rgb":[242,143,56]},{"index":1,"rgb":[217,30,30]}],
"blackbody":[{"index":0,"rgb":[0,0,0]},{"index":0.2,"rgb":[230,0,0]},{"index":0.4,"rgb":[230,210,0]},{"index":0.7,"rgb":[255,255,255]},{"index":1,"rgb":[160,200,255]}],
"earth":[{"index":0,"rgb":[0,0,130]},{"index":0.1,"rgb":[0,180,180]},{"index":0.2,"rgb":[40,210,40]},{"index":0.4,"rgb":[230,230,50]},{"index":0.6,"rgb":[120,70,20]},{"index":1,"rgb":[255,255,255]}],
"electric":[{"index":0,"rgb":[0,0,0]},{"index":0.15,"rgb":[30,0,100]},{"index":0.4,"rgb":[120,0,100]},{"index":0.6,"rgb":[160,90,0]},{"index":0.8,"rgb":[230,200,0]},{"index":1,"rgb":[255,250,220]}],
"alpha": [{"index":0, "rgb": [255,255,255,0]},{"index":1, "rgb": [255,255,255,1]}],
"viridis": [{"index":0,"rgb":[68,1,84]},{"index":0.13,"rgb":[71,44,122]},{"index":0.25,"rgb":[59,81,139]},{"index":0.38,"rgb":[44,113,142]},{"index":0.5,"rgb":[33,144,141]},{"index":0.63,"rgb":[39,173,129]},{"index":0.75,"rgb":[92,200,99]},{"index":0.88,"rgb":[170,220,50]},{"index":1,"rgb":[253,231,37]}],
"inferno": [{"index":0,"rgb":[0,0,4]},{"index":0.13,"rgb":[31,12,72]},{"index":0.25,"rgb":[85,15,109]},{"index":0.38,"rgb":[136,34,106]},{"index":0.5,"rgb":[186,54,85]},{"index":0.63,"rgb":[227,89,51]},{"index":0.75,"rgb":[249,140,10]},{"index":0.88,"rgb":[249,201,50]},{"index":1,"rgb":[252,255,164]}],
"magma": [{"index":0,"rgb":[0,0,4]},{"index":0.13,"rgb":[28,16,68]},{"index":0.25,"rgb":[79,18,123]},{"index":0.38,"rgb":[129,37,129]},{"index":0.5,"rgb":[181,54,122]},{"index":0.63,"rgb":[229,80,100]},{"index":0.75,"rgb":[251,135,97]},{"index":0.88,"rgb":[254,194,135]},{"index":1,"rgb":[252,253,191]}],
"plasma": [{"index":0,"rgb":[13,8,135]},{"index":0.13,"rgb":[75,3,161]},{"index":0.25,"rgb":[125,3,168]},{"index":0.38,"rgb":[168,34,150]},{"index":0.5,"rgb":[203,70,121]},{"index":0.63,"rgb":[229,107,93]},{"index":0.75,"rgb":[248,148,65]},{"index":0.88,"rgb":[253,195,40]},{"index":1,"rgb":[240,249,33]}],
"warm": [{"index":0,"rgb":[125,0,179]},{"index":0.13,"rgb":[172,0,187]},{"index":0.25,"rgb":[219,0,170]},{"index":0.38,"rgb":[255,0,130]},{"index":0.5,"rgb":[255,63,74]},{"index":0.63,"rgb":[255,123,0]},{"index":0.75,"rgb":[234,176,0]},{"index":0.88,"rgb":[190,228,0]},{"index":1,"rgb":[147,255,0]}],
"cool": [{"index":0,"rgb":[125,0,179]},{"index":0.13,"rgb":[116,0,218]},{"index":0.25,"rgb":[98,74,237]},{"index":0.38,"rgb":[68,146,231]},{"index":0.5,"rgb":[0,204,197]},{"index":0.63,"rgb":[0,247,146]},{"index":0.75,"rgb":[0,255,88]},{"index":0.88,"rgb":[40,255,8]},{"index":1,"rgb":[147,255,0]}],
"rainbow-soft": [{"index":0,"rgb":[125,0,179]},{"index":0.1,"rgb":[199,0,180]},{"index":0.2,"rgb":[255,0,121]},{"index":0.3,"rgb":[255,108,0]},{"index":0.4,"rgb":[222,194,0]},{"index":0.5,"rgb":[150,255,0]},{"index":0.6,"rgb":[0,255,55]},{"index":0.7,"rgb":[0,246,150]},{"index":0.8,"rgb":[50,167,222]},{"index":0.9,"rgb":[103,51,235]},{"index":1,"rgb":[124,0,186]}],
"bathymetry": [{"index":0,"rgb":[40,26,44]},{"index":0.13,"rgb":[59,49,90]},{"index":0.25,"rgb":[64,76,139]},{"index":0.38,"rgb":[63,110,151]},{"index":0.5,"rgb":[72,142,158]},{"index":0.63,"rgb":[85,174,163]},{"index":0.75,"rgb":[120,206,163]},{"index":0.88,"rgb":[187,230,172]},{"index":1,"rgb":[253,254,204]}],
"cdom": [{"index":0,"rgb":[47,15,62]},{"index":0.13,"rgb":[87,23,86]},{"index":0.25,"rgb":[130,28,99]},{"index":0.38,"rgb":[171,41,96]},{"index":0.5,"rgb":[206,67,86]},{"index":0.63,"rgb":[230,106,84]},{"index":0.75,"rgb":[242,149,103]},{"index":0.88,"rgb":[249,193,135]},{"index":1,"rgb":[254,237,176]}],
"chlorophyll": [{"index":0,"rgb":[18,36,20]},{"index":0.13,"rgb":[25,63,41]},{"index":0.25,"rgb":[24,91,59]},{"index":0.38,"rgb":[13,119,72]},{"index":0.5,"rgb":[18,148,80]},{"index":0.63,"rgb":[80,173,89]},{"index":0.75,"rgb":[132,196,122]},{"index":0.88,"rgb":[175,221,162]},{"index":1,"rgb":[215,249,208]}],
"density": [{"index":0,"rgb":[54,14,36]},{"index":0.13,"rgb":[89,23,80]},{"index":0.25,"rgb":[110,45,132]},{"index":0.38,"rgb":[120,77,178]},{"index":0.5,"rgb":[120,113,213]},{"index":0.63,"rgb":[115,151,228]},{"index":0.75,"rgb":[134,185,227]},{"index":0.88,"rgb":[177,214,227]},{"index":1,"rgb":[230,241,241]}],
"freesurface-blue": [{"index":0,"rgb":[30,4,110]},{"index":0.13,"rgb":[47,14,176]},{"index":0.25,"rgb":[41,45,236]},{"index":0.38,"rgb":[25,99,212]},{"index":0.5,"rgb":[68,131,200]},{"index":0.63,"rgb":[114,156,197]},{"index":0.75,"rgb":[157,181,203]},{"index":0.88,"rgb":[200,208,216]},{"index":1,"rgb":[241,237,236]}],
"freesurface-red": [{"index":0,"rgb":[60,9,18]},{"index":0.13,"rgb":[100,17,27]},{"index":0.25,"rgb":[142,20,29]},{"index":0.38,"rgb":[177,43,27]},{"index":0.5,"rgb":[192,87,63]},{"index":0.63,"rgb":[205,125,105]},{"index":0.75,"rgb":[216,162,148]},{"index":0.88,"rgb":[227,199,193]},{"index":1,"rgb":[241,237,236]}],
"oxygen": [{"index":0,"rgb":[64,5,5]},{"index":0.13,"rgb":[106,6,15]},{"index":0.25,"rgb":[144,26,7]},{"index":0.38,"rgb":[168,64,3]},{"index":0.5,"rgb":[188,100,4]},{"index":0.63,"rgb":[206,136,11]},{"index":0.75,"rgb":[220,174,25]},{"index":0.88,"rgb":[231,215,44]},{"index":1,"rgb":[248,254,105]}],
"par": [{"index":0,"rgb":[51,20,24]},{"index":0.13,"rgb":[90,32,35]},{"index":0.25,"rgb":[129,44,34]},{"index":0.38,"rgb":[159,68,25]},{"index":0.5,"rgb":[182,99,19]},{"index":0.63,"rgb":[199,134,22]},{"index":0.75,"rgb":[212,171,35]},{"index":0.88,"rgb":[221,210,54]},{"index":1,"rgb":[225,253,75]}],
"phase": [{"index":0,"rgb":[145,105,18]},{"index":0.13,"rgb":[184,71,38]},{"index":0.25,"rgb":[186,58,115]},{"index":0.38,"rgb":[160,71,185]},{"index":0.5,"rgb":[110,97,218]},{"index":0.63,"rgb":[50,123,164]},{"index":0.75,"rgb":[31,131,110]},{"index":0.88,"rgb":[77,129,34]},{"index":1,"rgb":[145,105,18]}],
"salinity": [{"index":0,"rgb":[42,24,108]},{"index":0.13,"rgb":[33,50,162]},{"index":0.25,"rgb":[15,90,145]},{"index":0.38,"rgb":[40,118,137]},{"index":0.5,"rgb":[59,146,135]},{"index":0.63,"rgb":[79,175,126]},{"index":0.75,"rgb":[120,203,104]},{"index":0.88,"rgb":[193,221,100]},{"index":1,"rgb":[253,239,154]}],
"temperature": [{"index":0,"rgb":[4,35,51]},{"index":0.13,"rgb":[23,51,122]},{"index":0.25,"rgb":[85,59,157]},{"index":0.38,"rgb":[129,79,143]},{"index":0.5,"rgb":[175,95,130]},{"index":0.63,"rgb":[222,112,101]},{"index":0.75,"rgb":[249,146,66]},{"index":0.88,"rgb":[249,196,65]},{"index":1,"rgb":[232,250,91]}],
"turbidity": [{"index":0,"rgb":[34,31,27]},{"index":0.13,"rgb":[65,50,41]},{"index":0.25,"rgb":[98,69,52]},{"index":0.38,"rgb":[131,89,57]},{"index":0.5,"rgb":[161,112,59]},{"index":0.63,"rgb":[185,140,66]},{"index":0.75,"rgb":[202,174,88]},{"index":0.88,"rgb":[216,209,126]},{"index":1,"rgb":[233,246,171]}],
"velocity-blue": [{"index":0,"rgb":[17,32,64]},{"index":0.13,"rgb":[35,52,116]},{"index":0.25,"rgb":[29,81,156]},{"index":0.38,"rgb":[31,113,162]},{"index":0.5,"rgb":[50,144,169]},{"index":0.63,"rgb":[87,173,176]},{"index":0.75,"rgb":[149,196,189]},{"index":0.88,"rgb":[203,221,211]},{"index":1,"rgb":[254,251,230]}],
"velocity-green": [{"index":0,"rgb":[23,35,19]},{"index":0.13,"rgb":[24,64,38]},{"index":0.25,"rgb":[11,95,45]},{"index":0.38,"rgb":[39,123,35]},{"index":0.5,"rgb":[95,146,12]},{"index":0.63,"rgb":[152,165,18]},{"index":0.75,"rgb":[201,186,69]},{"index":0.88,"rgb":[233,216,137]},{"index":1,"rgb":[255,253,205]}],
"cubehelix": [{"index":0,"rgb":[0,0,0]},{"index":0.07,"rgb":[22,5,59]},{"index":0.13,"rgb":[60,4,105]},{"index":0.2,"rgb":[109,1,135]},{"index":0.27,"rgb":[161,0,147]},{"index":0.33,"rgb":[210,2,142]},{"index":0.4,"rgb":[251,11,123]},{"index":0.47,"rgb":[255,29,97]},{"index":0.53,"rgb":[255,54,69]},{"index":0.6,"rgb":[255,85,46]},{"index":0.67,"rgb":[255,120,34]},{"index":0.73,"rgb":[255,157,37]},{"index":0.8,"rgb":[241,191,57]},{"index":0.87,"rgb":[224,220,93]},{"index":0.93,"rgb":[218,241,142]},{"index":1,"rgb":[227,253,198]}]
};
function lerp(v0, v1, t) {
return v0*(1-t)+v1*t;
}
function rgb2float (rgba) {
return [
rgba[0] / 255,
rgba[1] / 255,
rgba[2] / 255,
rgba[3]
]
}
function rgb2hex (rgba) {
var dig, hex = '#';
for (var i = 0; i < 3; ++i) {
dig = rgba[i];
dig = dig.toString(16);
hex += ('00' + dig).substr( dig.length );
}
return hex;
}
function rgbaStr (rgba) {
return 'rgba(' + rgba.join(',') + ')';
}
function createColormap (spec) {
/*
* Default Options
*/
var indicies, rgba, fromrgba, torgba,
nsteps, cmap, colormap, format,
nshades, colors, alpha, index, i,
r = [],
g = [],
b = [],
a = [];
if ( !spec ) spec = {};
nshades = (spec.nshades || 72) - 1;
format = spec.format || 'hex';
colormap = spec.colormap;
if (!colormap) colormap = 'jet';
if (typeof colormap === 'string') {
colormap = colormap.toLowerCase();
if (!colorScale[colormap]) {
throw Error(colormap + ' not a supported colorscale');
}
cmap = colorScale[colormap];
} else if (Array.isArray(colormap)) {
cmap = colormap.slice();
} else {
throw Error('unsupported colormap option', colormap);
}
if (cmap.length > nshades) {
throw new Error(
colormap+' map requires nshades to be at least size '+cmap.length
);
}
if (!Array.isArray(spec.alpha)) {
if (typeof spec.alpha === 'number') {
alpha = [spec.alpha, spec.alpha];
} else {
alpha = [1, 1];
}
} else if (spec.alpha.length !== 2) {
alpha = [1, 1];
} else {
alpha = spec.alpha.slice();
}
// map index points from 0..1 to 0..n-1
indicies = cmap.map(function(c) {
return Math.round(c.index * nshades);
});
// Add alpha channel to the map
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) {
var index = cmap[i].index
var rgba = cmap[i].rgb.slice();
// if user supplies their own map use it
if (rgba.length === 4 && rgba[3] >= 0 && rgba[3] <= 1) {
return rgba
}
rgba[3] = alpha[0] + (alpha[1] - alpha[0])*index;
return rgba
})
/*
* map increasing linear values between indicies to
* linear steps in colorvalues
*/
var colors = []
for (i = 0; i < indicies.length-1; ++i) {
nsteps = indicies[i+1] - indicies[i];
fromrgba = steps[i];
torgba = steps[i+1];
for (var j = 0; j < nsteps; j++) {
var amt = j / nsteps
colors.push([
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)
])
}
}
//add 1 step as last value
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 );
return colors;
};