forked from Hri7566/mpp-server-dev2
88 lines
2.4 KiB
JavaScript
88 lines
2.4 KiB
JavaScript
const Color = require("./Color");
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function hashCode(str) { // java String#hashCode
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var hash = 0;
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for (var i = 0; i < str.length; i++) {
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hash = str.charCodeAt(i) + ((hash << 5) - hash);
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}
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return hash;
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}
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function intToRGB(i){
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var c = (i & 0x00FFFFFF)
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.toString(16)
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.toUpperCase();
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return "00000".substring(0, 6 - c.length) + c;
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}
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/**
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* Converts an HSL color value to RGB. Conversion formula
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* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
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* Assumes h, s, and l are contained in the set [0, 1] and
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* returns r, g, and b in the set [0, 255].
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*
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* @param {number} h The hue
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* @param {number} s The saturation
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* @param {number} l The lightness
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* @return {Array} The RGB representation
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*/
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function hslToRgb(h, s, l){
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var r, g, b;
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if(s == 0){
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r = g = b = l; // achromatic
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}else{
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var hue2rgb = function hue2rgb(p, q, t){
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if(t < 0) t += 1;
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if(t > 1) t -= 1;
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if(t < 1/6) return p + (q - p) * 6 * t;
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if(t < 1/2) return q;
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if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
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return p;
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}
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var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
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var p = 2 * l - q;
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r = hue2rgb(p, q, h + 1/3);
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g = hue2rgb(p, q, h);
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b = hue2rgb(p, q, h - 1/3);
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}
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return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
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}
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function getTimeColor(currentDate = new Date()) {
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// get day of year as a number from 1-365
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let newYearsDay = new Date(currentDate.getFullYear());
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let differenceInTime = (currentDate - newYearsDay) + ((newYearsDay.getTimezoneOffset() - currentDate.getTimezoneOffset()) * 60 * 1000);
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let oneDayInMS = 1000 * 60 * 60 * 24;
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let dayOfYear = Math.ceil(differenceInTime / oneDayInMS);
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// get hour
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let hours = currentDate.getHours();
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let seconds = currentDate.getSeconds();
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// get a hue based on time of day and day of year
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let h = Math.floor((dayOfYear / 365) * 100) / 10000;
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let s = (hours + 1) / (24 / 3);
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// let s = 1;
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let l = 0.25 + Math.floor(((hours / 60)) * 1000) / 1000;
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if (l > 0.5) l = 0.5;
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if (s > 1) s = 1;
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// convert to rgb
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let [r, g, b] = hslToRgb(h, s, l);
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let col = new Color(r, g, b);
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return col;
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}
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module.exports = {
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hashCode,
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intToRGB,
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getTimeColor,
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hslToRgb
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}
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