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| import { isPresent } from '@ember/utils';
import { clamp } from './math';
/*
* Implements https://en.wikipedia.org/wiki/HSL_and_HSV#From_HSV
* to convert a hue/saturation/brightness color to RGB.
*
* If an alpha value is present in the input, it will be passed through,
* otherwise a default value of 1 will be included in the output.
*
* Examples:
* hsbaToRgba({ hue: 70, saturation: 0.3, brightness: 0.8 })
* => { red: 194, green: 204, blue: 143, alpha: 1 }
*/
export function hsbaToRgba(color) {
const { hue, saturation, brightness, alpha = 1 } = color;
const chroma = brightness * saturation;
const huePrime = hue / 60;
const hueDelta = 1 - Math.abs(huePrime % 2 - 1);
const intermediateValue = chroma * hueDelta;
let red = 0;
let green = 0;
let blue = 0;
if (huePrime >= 0 && huePrime <= 1) {
red = chroma;
green = intermediateValue;
blue = 0;
}
if (huePrime >= 1 && huePrime <= 2) {
red = intermediateValue;
green = chroma;
blue = 0;
}
Iif (huePrime >= 2 && huePrime <= 3) {
red = 0;
green = chroma;
blue = intermediateValue;
}
if (huePrime >= 3 && huePrime <= 4) {
red = 0;
green = intermediateValue;
blue = chroma;
}
Iif (huePrime >= 4 && huePrime <= 5) {
red = intermediateValue;
green = 0;
blue = chroma;
}
Iif (huePrime >= 5 && huePrime <= 6) {
red = chroma;
green = 0;
blue = intermediateValue;
}
const chromaBrightnessDelta = brightness - chroma;
red += chromaBrightnessDelta;
green += chromaBrightnessDelta;
blue += chromaBrightnessDelta;
return {
red: Math.round(red * 255),
green: Math.round(green * 255),
blue: Math.round(blue * 255),
alpha,
};
}
/*
* Implements https://en.wikipedia.org/wiki/HSL_and_HSV
* to convert an rgba color to hsba.
*
* If an alpha value is present in the input, it will be passed through,
* otherwise a default value of 1 will be included in the output.
*
* Examples:
* rgbaToHsb({ red: 194, green: 204, blue: 143, alpha: 1 })
* => { hue: 70, saturation: 0.3, brightness: 0.8 }
*/
export function rgbaToHsb(color) {
const { red, green, blue, alpha = 1 } = color;
const r = red / 255;
const g = green / 255;
const b = blue / 255;
const largestComponent = Math.max(r, g, b);
const smallestComponent = Math.min(r, g, b);
const delta = largestComponent - smallestComponent;
const saturation = largestComponent === 0 ? 0 : delta / largestComponent;
let huePercentage = 0;
switch (largestComponent) {
case r:
huePercentage = (g - b) / delta + (g < b ? 6 : 0);
break;
case g:
huePercentage = (b - r) / delta + 2;
break;
case b:
huePercentage = (r - g) / delta + 4;
break;
}
const hue = Math.round(huePercentage / 6 * 360);
return {
hue: clamp(hue, 0, 360) || 0,
saturation: clamp(saturation, 0, 1),
brightness: clamp(largestComponent, 0, 1),
alpha,
};
}
/*
* Converts an RGB(a) color represented as an object into a valid CSS `rgb` / `rgba`
* color.
*
* Examples:
* rgbaString({ red: 194, green: 204, blue: 143, alpha: 1 })
* => rga()
*
*/
export function rgbaString(color) {
const { red, green, blue, alpha } = color;
if (isPresent(alpha)) {
return `rgba(${ red }, ${ green }, ${ blue }, ${ alpha })`;
}
return `rgb(${ red }, ${ green }, ${ blue })`;
}
export function rgbToHex({red, green, blue}) {
return `#${ componentToHex(red) }${ componentToHex(green) }${ componentToHex(blue) }`;
}
function componentToHex(component) {
const hex = component.toString(16);
return hex.length === 1 ? `0${ hex }` : hex;
}
export function hsbToHex(color) {
return rgbToHex(hsbaToRgba(color));
}
/*
* Converts an object representation of an RGB(a) color to HEX.
*
* NOTE: This is shamelessly copied from https://github.com/sindresorhus/rgb-hex
*
* Examples:
*
* rgbHex({ 65, 131, 196 });
* => '4183c4'
*
* rgbHex(65, 131, 196);
* => '4183c4'
*
* rgbHex('rgb(40, 42, 54)');
* => '282a36'
*
* rgbHex(65, 131, 196, 0.2);
* => '4183c433'
*
* rgbHex(40, 42, 54, '75%');
* => '282a36bf'
*
* rgbHex('rgba(40, 42, 54, 75%)');
* => '282a36bf'
*/
export function rgbaToHex(red, green, blue, alpha) {
const isPercent = `${ red }${ alpha || '' }`.toString().includes('%');
if (typeof red === 'string') {
const res = red.match(/(0?\.?\d{1,3})%?\b/g).map(Number);
[ red, green, blue, alpha ] = res;
} else if (typeof red === 'object') {
({ red, green, blue, alpha } = red);
} else if (isPresent(alpha)) {
alpha = parseFloat(alpha);
}
Iif (typeof red !== 'number' ||
typeof green !== 'number' ||
typeof blue !== 'number' ||
red > 255 ||
green > 255 ||
blue > 255) {
throw new TypeError('Expected three numbers below 256');
}
if (typeof alpha === 'number') {
if (!isPercent && alpha >= 0 && alpha <= 1) {
alpha = Math.round(255 * alpha);
} else Eif (isPercent && alpha >= 0 && alpha <= 100) {
alpha = Math.round(255 * alpha / 100);
} else {
throw new TypeError(`Expected alpha value (${alpha}) as a fraction or percentage`);
}
alpha = (alpha | 1 << 8).toString(16).slice(1);
} else {
alpha = '';
}
return ((blue | green << 8 | red << 16) | 1 << 24).toString(16).slice(1) + alpha;
}
export function hexToRgb(hex) {
Iif (typeof hex !== 'string') {
throw new TypeError('Expected a string');
}
hex = hex.replace(/^#/, '');
if (hex.length === 3) {
hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
}
const num = parseInt(hex, 16);
return {
red: num >> 16,
green: num >> 8 & 255,
blue: num & 255,
};
}
export function hexToHsb(hex) {
return rgbaToHsb(hexToRgb(hex));
}
export function hsbaToHex(color) {
return rgbaToHex(hsbaToRgba(color));
}
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