chromatism
Version:
A simple set of utility functions for colours.
2 lines (1 loc) • 16 kB
JavaScript
;function getIlluminant(r){return ILLUMINANTS[r]}function matrixMultiply(r,t){for(var n=[],e=0;e<r.length;e++){n[e]=[];for(var o=0;o<t[0].length;o++){for(var u=0,a=0;a<r[0].length;a++)u+=r[e][a]*t[a][o];n[e][o]=u}}return n}function getTransform(r){return TRANSFORMS[r]}function determineType(r){var t=types.find(function(t){return testColorType[t](r)});if(!t)throw new Error("No type found for color "+r);return t}function toRadian(r){return r*(Math.PI/180)}function toDegree(r){return r*(180/Math.PI)}function negativeModulo(r,t){return(r%t+t)%t}function bounded(r,t){return r<t[0]?r=t[0]:r>t[1]&&(r=t[1]),r}function boundedRgb(r){return{r:bounded255(r.r),g:bounded255(r.g),b:bounded255(r.b)}}function cubeRoot(r){if(Math.cbrt)return Math.cbrt(r);var t=Math.pow(Math.abs(r),1/3);return r<0?-t:t}function convert(r,t,n){if(void 0===t)throw new Error("No value provided");var e=n||determineType(t);if(e===r)return t;if(conversions[e][r])return convertNow(e,r,t);var o=conversionSteps[e],u="string"==typeof o?o:o[r]||o.default;return convert(r,convertNow(e,u,t),u)}function makeColourObject(r){var t={};return types$1.forEach(function(n){Object.defineProperty(t,n,{get:function(){return convertArrayOrColour(n,r)},enumerable:!0})}),t}function adapt(r,t,n){var e=convert("XYZ",r),o=convert("lms",getIlluminant(t)||getIlluminant("D65")),u=convert("lms",getIlluminant(n)||getIlluminant("D65")),a=getTransform("BRADFORD"),c=matrixMultiply(matrixMultiply(matrixMultiply(getTransform("INVERSE_BRADFORD"),[[o.rho/u.rho,0,0],[0,o.gamma/u.gamma,0],[0,0,o.beta/u.beta]]),a),[[e.X],[e.Y],[e.Z]]);return makeColourObject({X:c[0][0],Y:c[1][0],Z:c[2][0]})}function adjacent(r,t,n){for(var e=convert("hsl",n),o=[{h:e.h,s:e.s,l:e.l}],u=0;u<t-1;u++)e.h=negativeModulo(e.h+r,360),o.push({h:e.h,s:e.s,l:e.l});return makeColourObject(o)}function brightness(r,t){var n=convert("hsl",t);return n.l+=r,n.l<0?n.l=0:n.l>100&&(n.l=100),makeColourObject(n)}function complementary(r){var t=convert("hsl",r);return t.h=(t.h+180)%360,makeColourObject(t)}function contrast(r,t){var n=convert("rgb",t);return n.r=255*((n.r/255-.5)*r+.5),n.r<0?n.r=0:n.r>255&&(n.r=255),n.g=255*((n.g/255-.5)*r+.5),n.g<0?n.g=0:n.g>255&&(n.g=255),n.b=255*((n.b/255-.5)*r+.5),n.b<0?n.b=0:n.b>255&&(n.b=255),makeColourObject(n)}function contrastRatio(r){var t=convert("rgb",r);return t=(299*t.r+587*t.g+114*t.b)/1e3>=128?{r:0,g:0,b:0}:{r:255,g:255,b:255},makeColourObject(t)}function difference(r,t,n,e){n=n||1,e=e||1;var o=convert("cielab",r),u=convert("cielab",t),a=Math.sqrt(Math.pow(o.a,2)+Math.pow(o.b,2)),c=a-Math.sqrt(Math.pow(u.a,2)+Math.pow(u.b,2)),i=o.L-u.L,s=o.a-u.a,l=o.b-u.b,h=Math.sqrt(Math.pow(s,2)+Math.pow(l,2)-Math.pow(c,2)),f=o.L<16?.511:.040975*o.L/(1.01765*o.L),v=.0638*a/(1.0131*a),b=Math.atan2(o.b,o.a),g=b>=0?b:b+360,p=g>=164&&g<=345?.56+Math.abs(.2*Math.cos(toRadian(g+168))):.36+Math.abs(.4*Math.cos(toRadian(g+35))),m=Math.pow(a,4)/(Math.pow(a,4)+1900),d=v*(m*p+1-m),Y=Math.pow(i/(n*f),2),M=Math.pow(c/(e*v),2),y=Math.pow(h/d,2);return Math.sqrt(Y+M+y)}function slopeMod(r,t){return r>2*t?slopeMod(r-2*t,t):r>t?2*t-r:r<0?slopeMod(r+2*t,t):r}function fade(r,t,n){var e=convert("rgb",t),o=convert("rgb",n),u=[e];r-=1;for(var a=(o.r-e.r)/r,c=(o.g-e.g)/r,i=(o.b-e.b)/r,s={r:e.r,g:e.g,b:e.b},l=0;l<r-1;l++)s.r=slopeMod(s.r+a,255),s.g=slopeMod(s.g+c,255),s.b=slopeMod(s.b+i,255),u.push({r:s.r,g:s.g,b:s.b});return u.push(o),makeColourObject(u)}function greyscale(r){var t=convert("rgb",r),n=(t.r+t.g+t.b)/3;return t={r:n,g:n,b:n},makeColourObject(t)}function hue(r,t){var n=convert("hsl",t);return n.h=negativeModulo(n.h+r,360),makeColourObject(n)}function invert(r){var t=convert("rgb",r);return t.r=negativeModulo(255-t.r,255),t.g=negativeModulo(255-t.g,255),t.b=negativeModulo(255-t.b,255),makeColourObject(t)}function invertLightness(r){var t=convert("hsl",r);return t.l=100-t.l,makeColourObject(t)}function mid(r,t){var n=convert("hsl",r),e=convert("hsl",t);return makeColourObject({h:(n.h+e.h)/2,s:(n.s+e.s)/2,l:(n.l+e.l)/2})}function multiply(r,t){var n=convert("hsl",r),e=convert("hsl",t),o={h:n.h,s:n.s,l:n.l/100*(e.l/100)*100};return o.l=o.l>100?100:o.l,o.l=o.l<0?0:o.l,makeColourObject(o)}function saturation(r,t){var n=convert("hsl",t);return n.s+=r,n.s<0?n.s=0:n.s>100&&(n.s=100),makeColourObject(n)}function sepia(r){var t=convert("rgb",r),n={};return n.r=.393*t.r+.769*t.g+.189*t.b,n.g=.349*t.r+.686*t.g+.168*t.b,n.b=.272*t.r+.534*t.g+.131*t.b,makeColourObject(n)}function shade(r,t){var n=convert("hsv",t);return console.log(n),n.v+=r,n.v<0?n.v=0:n.v>100&&(n.v=100),console.log(n),makeColourObject(n)}function temperature(r){var t=convert("xyY",r),n=(t.x-.332)/(t.y-.1858);return-449*Math.pow(n,3)+3525*Math.pow(n,2)-6823.3*n+5520.33}function tetrad(r){for(var t=convert("hsl",r),n=[{h:t.h,s:t.s,l:t.l}],e=0;e<3;e++)t.h=(t.h+90)%360,n.push({h:t.h,s:t.s,l:t.l});return makeColourObject(n)}function triad(r){for(var t=convert("hsl",r),n=[{h:t.h,s:t.s,l:t.l}],e=0;e<2;e++)t.h=(t.h+120)%360,n.push({h:t.h,s:t.s,l:t.l});return makeColourObject(n)}function complementary$1(r){var t=convert("hsluv",r);return t.hu=(t.hu+180)%360,makeColourObject(t)}function triad$1(r){for(var t=convert("hsluv",r),n=[{hu:t.hu,s:t.s,l:t.l}],e=0;e<2;e++)t.hu=(t.hu+120)%360,n.push({h:t.hu,s:t.s,l:t.l});return makeColourObject(n)}function tetrad$1(r){for(var t=convert("hsluv",r),n=[{hu:t.hu,s:t.s,l:t.l}],e=0;e<3;e++)t.hu=(t.hu+90)%360,n.push({h:t.hu,s:t.s,l:t.l});return makeColourObject(n)}Object.defineProperty(exports,"__esModule",{value:!0});var ILLUMINANTS={A:{X:1.0985*100,Y:100,Z:35.585},B:{X:99.072,Y:100,Z:85.223},C:{X:98.074,Y:100,Z:118.232},D50:{X:96.422,Y:100,Z:82.521},D55:{X:95.682,Y:100,Z:92.149},D65:{X:95.047,Y:100,Z:108.883},D75:{X:94.972,Y:100,Z:122.638},E:{X:100,Y:100,Z:100},F2:{X:.99186*100,Y:100,Z:67.393},F7:{X:95.041,Y:100,Z:108.747},F11:{X:1.00962*100,Y:100,Z:64.35}},TRANSFORMS={BRADFORD:[[.8951,.2664,-.1614],[-.7502,1.7135,.0367],[.0389,-.0685,1.0296]],INVERSE_BRADFORD:[[.9869929,-.1470543,.1599627],[.4323053,.5183603,.0492912],[-.0085287,.0400428,.9684867]],SRGB_XYZ:[[.4124,.3576,.1805],[.2126,.7152,.0722],[.0193,.1192,.9505]],INVERSE_SRGB_XYZ:[[3.2406,-1.5372,-.4986],[-.9689,1.8758,.0415],[.0557,-.204,1.057]]},contains=function(r,t){var n=new Set(Object.keys(r));return t.every(function(r){return n.has(r)})},stringStartsWith=function(r,t){return"string"==typeof r&&r.slice(0,t.length)===t},testColorType={hex:function(r){return stringStartsWith(r,"#")},rgb:function(r){return contains(r,["r","g","b"])},cssrgb:function(r){return stringStartsWith(r,"rgb(")},hsl:function(r){return contains(r,["h","s","l"])},csshsl:function(r){return stringStartsWith(r,"hsl(")},hsv:function(r){return contains(r,["h","s","v"])},cmyk:function(r){return contains(r,["c","m","y","k"])},yiq:function(r){return contains(r,["y","i","q"])},XYZ:function(r){return contains(r,["X","Y","Z"])},xyY:function(r){return contains(r,["x","y","Y"])},lms:function(r){return contains(r,["rho","gamma","beta"])},cielab:function(r){return contains(r,["L","a","b"])},cieluv:function(r){return contains(r,["L","u","v"])},cielch:function(r){return contains(r,["L","C","h"])},hsluv:function(r){return contains(r,["hu","s","l"])}},types=Object.keys(testColorType),epsilon=.008856,kappa=903.3,white=getIlluminant("D65"),toR=function(r){return Math.pow(r,3)>epsilon?Math.pow(r,3):(116*r-16)/kappa},cielab={XYZ:function(r){var t=(r.L+16)/116,n=r.a/500+t,e=t-r.b/200,o=toR(n),u=toR(e),a=r.L>kappa*epsilon?Math.pow(t,3):r.L/kappa;return{X:o*white.X,Y:a*white.Y,Z:u*white.Z}}},cielch={cieluv:function(r){var t=toRadian(r.h),n=r.C*Math.cos(t),e=r.C*Math.sin(t);return{L:r.L,u:n,v:e}},hsluv:function(r){if(r.L>99.9999999)return{hu:r.h,s:0,l:100};if(r.L<1e-8)return{hu:r.h,s:0,l:0};for(var t=(r.L+16)/1560896,n=t>.008856?t:r.L/903.3,e=getTransform("INVERSE_SRGB_XYZ"),o=[],u=0;u<3;u++)for(var a=e[u][0],c=e[u][1],i=e[u][2],s=0;s<2;s++){var l=(284517*a-94839*i)*n,h=(838422*i+769860*c+731718*a)*r.L*n-769860*s*r.L,f=(632260*i-126452*c)*n+126452*s;o.push({m:l/f,b:h/f})}var v=Number.MAX_VALUE,b=toRadian(r.h);o.forEach(function(r){var t=r.b/(Math.sin(b)-r.m*Math.cos(b));t>=0&&(v=Math.min(v,t))});var g=v;return{hu:r.h,s:r.C/g*100,l:r.L}}},cieluv={XYZ:function(r){var t=getIlluminant("D65"),n=function(r){return 4*r.X/(r.X+15*r.Y+3*r.Z)}(t),e=function(r){return 9*r.Y/(r.X+15*r.Y+3*r.Z)}(t),o=1/3*(52*r.L/(r.u+13*r.L*n)-1),u=r.L>903.3*.008856?Math.pow((r.L+16)/116,3):r.L/903.3,a=-5*u,c=(u*(39*r.L/(r.v+13*r.L*e)-5)-a)/(o- -1/3);return{X:100*c,Y:100*u,Z:100*(c*o+a)}},cielch:function(r){var t=Math.sqrt(Math.pow(r.u,2)+Math.pow(r.v,2)),n=Math.atan2(r.v,r.u);return n<0&&(n+=2*Math.PI),n=toDegree(n),{L:r.L,C:t,h:n}}},rgb=function(r){return{r:255*(1-r.c)*(1-r.k),g:255*(1-r.m)*(1-r.k),b:255*(1-r.y)*(1-r.k)}},cmyk={rgb:rgb,cssrgb:function(r){var t=rgb(r),n=t.r,e=t.g,o=t.b;return"rgb("+Math.round(n)+","+Math.round(e)+","+Math.round(o)+")"}},csshsl={hsl:function(r){var t=r.replace(/(hsl\(|\)|%|[\s]*)/g,"").split(",").map(function(r){return parseInt(r,10)});return{h:t[0],s:t[1],l:t[2]}}},cssrgb={rgb:function(r){var t=r.replace(/((rgb\(|\))|[\s]*)/g,"").split(",").map(function(r){return parseInt(r,10)});return{r:t[0],g:t[1],b:t[2]}}},hex={rgb:function(r){var t=r.replace("#","").match(/.{2}/g).map(function(r){return parseInt(r,16)});return{r:t[0],g:t[1],b:t[2]}}},hsl={rgb:function(r){if(0===r.s){var t=r.l/100*255;return{r:t,g:t,b:t}}var n,e,o;n=r.l>=50?r.l/100+r.s/100-r.l/100*(r.s/100):r.l/100*(1+r.s/100),e=r.l/100*2-n;var u,a,c,i=((o=r.h/360)+.333)%1,s=o,l=negativeModulo(o-.333,1);return u=6*i<1?e+6*(n-e)*i:2*i<1?n:3*i<2?e+6*(.666-i)*(n-e):e,a=6*s<1?e+6*(n-e)*s:2*s<1?n:3*s<2?e+6*(.666-s)*(n-e):e,c=6*l<1?e+6*(n-e)*l:2*l<1?n:3*l<2?e+6*(.666-l)*(n-e):e,u<0&&(u=0),a<0&&(a=0),c<0&&(c=0),{r:255*u,g:255*a,b:255*c}},csshsl:function(r){return"hsl("+Math.round(r.h)+","+Math.round(r.s)+"%,"+Math.round(r.l)+"%)"},hsv:function(r){var t=Object.assign({},r,{s:r.s/100,l:r.l/100}),n=t.s*(t.l<.5?t.l:1-t.l);return{h:t.h,s:100*(2*n/(t.l+n)),v:100*(t.l+n)}}},hsluv={cielch:function(r){if(r.L>99.9999999)return{L:100,C:0,h:r.hu};if(r.L<1e-8)return{L:0,C:0,h:r.hu};for(var t=(r.l+16)/1560896,n=t>.008856?t:r.l/903.3,e=getTransform("INVERSE_SRGB_XYZ"),o=[],u=0;u<3;u++)for(var a=e[u][0],c=e[u][1],i=e[u][2],s=0;s<2;s++){var l=(284517*a-94839*i)*n,h=(838422*i+769860*c+731718*a)*r.l*n-769860*s*r.l,f=(632260*i-126452*c)*n+126452*s;o.push({m:l/f,b:h/f})}var v=Number.MAX_VALUE,b=toRadian(r.hu);o.forEach(function(r){var t=r.b/(Math.sin(b)-r.m*Math.cos(b));t>=0&&(v=Math.min(v,t))});var g=v;return{L:r.l,C:g/100*r.s,h:r.hu}}},hsv={hsl:function(r){var t=Object.assign({},r,{h:r.h/360,s:r.s/100,v:r.v/100});return{h:360*t.h,s:100*((2-t.s)*t.v<1?t.s*t.v/((2-t.s)*t.v):t.s*t.v/(2-(2-t.s)*t.v)),l:100*((2-t.s)*t.v/2)}}},lms={XYZ:function(r){var t=[r.rho,r.gamma,r.beta],n=getTransform("INVERSE_BRADFORD").map(function(r){return t.reduce(function(t,n,e){return r[e]*n+t},0)});return{X:100*n[0],Y:100*n[1],Z:100*n[2]}}},bounded255=function(r){return bounded(r,[0,255])},slicedToArray=function(){function r(r,t){var n=[],e=!0,o=!1,u=void 0;try{for(var a,c=r[Symbol.iterator]();!(e=(a=c.next()).done)&&(n.push(a.value),!t||n.length!==t);e=!0);}catch(r){o=!0,u=r}finally{try{!e&&c.return&&c.return()}finally{if(o)throw u}}return n}return function(t,n){if(Array.isArray(t))return t;if(Symbol.iterator in Object(t))return r(t,n);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),epsilon$1=.008856,kappa$1=903.3,white$1=getIlluminant("D65"),fromXYZ={rgb:function(r){var t=[r.X,r.Y,r.Z].map(function(r){return r/100}),n=getTransform("INVERSE_SRGB_XYZ").map(function(r){return t.reduce(function(t,n,e){return r[e]*n+t},0)}).map(function(r){return r<=.0031308?12.92*r:1.055*Math.pow(r,1/2.4)-.055}).map(function(r){return 255*r}),e=slicedToArray(n,3);return boundedRgb({r:e[0],g:e[1],b:e[2]})},lms:function(r){var t=[r.X,r.Y,r.Z].map(function(r){return r/100}),n=getTransform("BRADFORD").map(function(r){return t.reduce(function(t,n,e){return r[e]*n+t},0)});return{rho:n[0],gamma:n[1],beta:n[2]}},cielab:function(r){var t=r.X/white$1.X,n=r.Y/white$1.Y,e=r.Z/white$1.Z,o=function(r){return r>epsilon$1?cubeRoot(r):(kappa$1*r+16)/116},u=o(t),a=o(n);return{L:116*a-16,a:500*(u-a),b:200*(a-o(e))}},cieluv:function(r){var t=r.Y/white$1.Y,n=t>epsilon$1?116*cubeRoot(t)-16:kappa$1*t,e=function(r){return 4*r.X/(r.X+15*r.Y+3*r.Z)},o=function(r){return 9*r.Y/(r.X+15*r.Y+3*r.Z)};return{L:n,u:13*n*(e(r)-e(white$1)),v:13*n*(o(r)-o(white$1))}},xyY:function(r){return{x:r.X/(r.X+r.Y+r.Z),y:r.Y/(r.X+r.Y+r.Z),Y:r.Y}}},fromXYZTolms=fromXYZ.lms,fromXYZTocielab=fromXYZ.cielab,fromXYZTocieluv=fromXYZ.cieluv,fromXYZToxyY=fromXYZ.xyY,hsl$1=function(r){var t,n,e=r.r/255,o=r.g/255,u=r.b/255,a=[e,o,u].sort(),c=(a[0]+a[2])/2*100;return a[0]===a[2]?(t=0,n=0):(t=c>=50?(a[2]-a[0])/(2-a[2]-a[0])*100:(a[2]-a[0])/(a[2]+a[0])*100,(n=a[2]===e?(o-u)/(a[2]-a[0])*60:a[2]===o?60*(2+(u-e)/(a[2]-a[0])):60*(4+(e-o)/(a[2]-a[0])))<0?n+=360:n>360&&(n%=360)),{h:n,s:t,l:c}},cieluv$1=function(r){return fromXYZTocieluv(XYZ(r))},XYZ=function(r){var t=[r.r,r.g,r.b].map(function(r){return r/255}).map(function(r){return r<=.04045?r/12.92:Math.pow((r+.055)/1.055,2.4)}),n=getTransform("SRGB_XYZ").map(function(r){return t.reduce(function(t,n,e){return r[e]*n+t},0)}).map(function(r){return 100*r}),e=slicedToArray(n,3);return{X:e[0],Y:e[1],Z:e[2]}},rgb$1={hex:function(r){var t=Math.round(r.r).toString(16);1===t.length&&(t="0"+t);var n=Math.round(r.g).toString(16);1===n.length&&(n="0"+n);var e=Math.round(r.b).toString(16);return 1===e.length&&(e="0"+e),"#"+t+n+e},cssrgb:function(r){return"rgb("+Math.round(r.r)+","+Math.round(r.g)+","+Math.round(r.b)+")"},hsl:hsl$1,csshsl:function(r){var t=hsl$1(r),n=t.h,e=t.s,o=t.l;return"hsl("+Math.round(n)+","+Math.round(e)+"%,"+Math.round(o)+"%)"},cmyk:function(r){var t=r.r/255,n=r.g/255,e=r.b/255,o=1-Math.max(t,n,e);return 1!==o?{c:(1-t-o)/(1-o),m:(1-n-o)/(1-o),y:(1-e-o)/(1-o),k:o}:{c:0,m:0,y:0,k:o}},yiq:function(r){var t=r.r/255*.299+r.g/255*.587+r.b/255*.114,n=r.r/255*.596+r.g/255*-.274+r.b/255*-.322,e=r.r/255*.211+r.g/255*-.523+r.b/255*.312;return n=bounded(n,[-.5957,.5957]),e=bounded(e,[-.5226,.5226]),{y:t,i:n,q:e}},XYZ:XYZ,lms:function(r){return fromXYZTolms(XYZ(r))},cielab:function(r){return fromXYZTocielab(XYZ(r))},cieluv:cieluv$1,xyY:function(r){return fromXYZToxyY(XYZ(r))}},xyY={XYZ:function(r){var t=r.x,n=r.y,e=r.Y;return{X:e/n*t,Y:e,Z:e/n*(1-t-n)}}},bound=function(r){return bounded(r,[0,255])},yiq={rgb:function(r){var t=bounded(r.i,[-.5957,.5957]),n=bounded(r.q,[-.5226,.5226]);return{r:255*bound(r.y+.956*t+.621*n),g:255*bound(r.y+-.272*t+-.647*n),b:255*bound(r.y+-1.106*t+-1.703*n)}}},conversions=Object.freeze({cielab:cielab,cielch:cielch,cieluv:cieluv,cmyk:cmyk,csshsl:csshsl,cssrgb:cssrgb,hex:hex,hsl:hsl,hsluv:hsluv,hsv:hsv,lms:lms,rgb:rgb$1,xyY:xyY,XYZ:fromXYZ,yiq:yiq}),conversionSteps={rgb:{default:"XYZ",csshsl:"hsl",hsv:"hsl"},hex:"rgb",hsl:"rgb",hsv:"hsl",csshsl:"hsl",cssrgb:"rgb",cmyk:"rgb",XYZ:{default:"rgb",cielch:"cieluv",hsluv:"cieluv"},xyY:"XYZ",lms:"XYZ",cieluv:{default:"XYZ",hsluv:"cielch"},cielch:"cieluv",cielab:"XYZ",yiq:"rgb",hsluv:"cielch"},convertNow=function(r,t,n){return conversions[r][t](n)},types$1=Object.keys(testColorType),convertArrayOrColour=function(r,t){return Array.isArray(t)?t.map(function(t){return convert(r,t)}):convert(r,t)};exports.adapt=adapt,exports.adjacent=adjacent,exports.brightness=brightness,exports.complementary=complementary,exports.contrast=contrast,exports.contrastRatio=contrastRatio,exports.convert=makeColourObject,exports.difference=difference,exports.fade=fade,exports.greyscale=greyscale,exports.hue=hue,exports.invert=invert,exports.invertLightness=invertLightness,exports.mid=mid,exports.multiply=multiply,exports.saturation=saturation,exports.sepia=sepia,exports.shade=shade,exports.temperature=temperature,exports.tetrad=tetrad,exports.triad=triad,exports.uniformComplementary=complementary$1,exports.uniformTriad=triad$1,exports.uniformTetrad=tetrad$1;