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Generate and validate colors
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| /** | |
| * Class Color | |
| */ | |
| export default class Color { | |
| constructor(color = null) { | |
| if (color) { | |
| this.setColour(color) | |
| } else { | |
| this.colour = this.generateRandomColor(); | |
| } | |
| this.setThresh(); | |
| } | |
| static isValidColorName(color) { | |
| const style = new Option().style; | |
| style.color = color; | |
| return style.color === color; | |
| } | |
| static isValidHexCode(color) { | |
| return /(^#[0-9A-F]{6}$)|(^#[0-9A-F]{3}$)/i.test(color); | |
| } | |
| setColour(color) { | |
| const colorStr = this.getHexCodeFromName(color); | |
| if (this.constructor.isValidHexCode(color)) { | |
| this.colour = color; | |
| } else if (this.constructor.isValidColorName(color) && colorStr) { | |
| this.colour = colorStr; | |
| } else { | |
| this.colour = this.generateSeededColor(color) | |
| } | |
| } | |
| setThresh() { | |
| const luminance = {r: 0.2126, g: 0.7152, b: 0.0722}; | |
| const color = this.colour; | |
| const r = parseInt(color.substring(1, 3), 16); | |
| const g = parseInt(color.substring(3, 5), 16); | |
| const b = parseInt(color.substring(5), 16); | |
| const rgb = [r / 255, g / 255, b / 255]; | |
| for (let i = rgb.length; i--;) | |
| rgb[i] = | |
| rgb[i] <= 0.03928 | |
| ? rgb[i] / 12.92 | |
| : Math.pow((rgb[i] + 0.055) / 1.055, 2.4); | |
| this.thresh = | |
| luminance.r * rgb[0] + luminance.g * rgb[1] + luminance.b * rgb[2]; | |
| } | |
| getHexCodeFromName(color) { | |
| const div = document.createElement('div'); | |
| div.style.display = 'hidden'; | |
| div.style.color = color; | |
| const colors = window.getComputedStyle(document.body.appendChild(div)) | |
| .color | |
| .match(/\d+/g) | |
| .map(div => parseInt(div,10)); | |
| document.body.removeChild(div); | |
| return colors.length >= 3 | |
| ? '#' + ((1 << 24) + (colors[0] << 16) + (colors[1] << 8) + colors[2]) | |
| .toString(16) | |
| .slice(1) | |
| : false; | |
| } | |
| generateRandomColor() { | |
| return this.generateSeededColor(Math.random()) | |
| } | |
| generateSeededColor(seed) { | |
| let seederNum = 0; | |
| for (const char of seed) { | |
| seederNum += char.charCodeAt(0) | |
| } | |
| let color = Math.floor((Math.abs(Math.sin(seederNum) * 16777215)) % 16777215); | |
| color = color.toString(16); | |
| // pad any colors shorter than 6 characters with leading 0s | |
| while (color.length < 6) { | |
| color = '0' + color; | |
| } | |
| return '#' + color; | |
| } | |
| /** | |
| * Get the accent | |
| * @return {string} | |
| */ | |
| get hoverColor() { | |
| // strip the leading # if it's there | |
| let hex = this.colour.replace(/^\s*#|\s*$/g, ""); | |
| // convert 3 char codes --> 6, e.g. `E0F` --> `EE00FF` | |
| if (hex.length === 3) { | |
| hex = hex.replace(/(.)/g, "$1$1"); | |
| } | |
| const r = parseInt(hex.slice(0, 2), 16), | |
| g = parseInt(hex.slice(2, 4), 16), | |
| b = parseInt(hex.slice(4, 6), 16); | |
| const percent = this.thresh < 0.39 ? 25 : -25; | |
| return ( | |
| "#" + | |
| (0 | ((1 << 8) + r + ((256 - r) * percent) / 100)).toString(16).slice(1) + | |
| (0 | ((1 << 8) + g + ((256 - g) * percent) / 100)).toString(16).slice(1) + | |
| (0 | ((1 << 8) + b + ((256 - b) * percent) / 100)).toString(16).slice(1) | |
| ); | |
| } | |
| get foregroundColor() { | |
| return this.thresh > 0.39 ? "#222" : "#ffffff"; | |
| } | |
| get color() { | |
| return this.colour; | |
| } | |
| set color(color) { | |
| this.setColour(color); | |
| this.setThresh(); | |
| return this; | |
| } | |
| } |
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