108 lines
2.3 KiB
JavaScript
108 lines
2.3 KiB
JavaScript
// Sshwifty - A Web SSH client
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//
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// Copyright (C) 2019-2021 Ni Rui <nirui@gmx.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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/**
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* Get one color hex byte
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*
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* @param {number} from Min color number
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* @param {number} to Max color number
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*
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* @returns {string} color byte in string
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*
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*/
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function getRandHex(from, to) {
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let color = Math.random() * (to - from) + from,
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colorDark = color - color / 20;
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let r = Math.round(color).toString(16),
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rDark = Math.round(colorDark).toString(16);
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if (r.length % 2 !== 0) {
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r = "0" + r;
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}
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if (rDark.length % 2 !== 0) {
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rDark = "0" + rDark;
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}
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return [r, rDark];
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}
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/**
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* Get rand color
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*
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* @param {number} from Min color number
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* @param {number} to Max color number
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*
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* @returns {string} Color bytes in string
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*/
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function getRandColor(from, to) {
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let r = getRandHex(from, to),
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g = getRandHex(from, to),
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b = getRandHex(from, to);
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return ["#" + r[0] + g[0] + b[0], "#" + r[1] + g[1] + b[1]];
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}
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export class Color {
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/**
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* constructor
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*/
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constructor() {
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this.assignedColors = {};
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}
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/**
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* Get one color
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*
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* @returns {string} Color code
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*
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*/
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get() {
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const maxTries = 10;
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let tried = 0;
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for (;;) {
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let color = getRandColor(0x22, 0x33);
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if (this.assignedColors[color[0]]) {
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tried++;
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if (tried < maxTries) {
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continue;
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}
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}
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this.assignedColors[color[0]] = true;
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return {
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color: color[0],
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dark: color[1]
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};
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}
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}
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/**
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* forget already assigned color
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*
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* @param {string} color Color code
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*/
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forget(color) {
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delete this.assignedColors[color];
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}
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}
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