/** * ownCloud * * @author John Molakvoæ * @copyright 2016 John Molakvoæ * @author Morris Jobke * @copyright 2013 Morris Jobke * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU AFFERO GENERAL PUBLIC LICENSE for more details. * * You should have received a copy of the GNU Affero General Public * License along with this library. If not, see . * */ /* * Adds a background color to the element called on and adds the first character * of the passed in string. This string is also the seed for the generation of * the background color. * * You have following HTML: * *
* * And call this from Javascript: * * $('#albumart').imageplaceholder('The Album Title'); * * Which will result in: * *
T
* * You may also call it like this, to have a different background, than the seed: * * $('#albumart').imageplaceholder('The Album Title', 'Album Title'); * * Resulting in: * *
A
* */ /* * Alternatively, you can use the prototype function to convert your string to hsl colors: * * "a6741a86aded5611a8e46ce16f2ad646".toHsl() * * Will return the hsl parameters within an array: * * [290, 60, 68] * */ (function ($) { String.prototype.toHsl = function() { var hash = this.toLowerCase().replace(/[^0-9a-f]+/g, ''); // Already a md5 hash? if( !hash.match(/^[0-9a-f]{32}$/g) ) { hash = md5(hash); } function rgbToHsl(r, g, b) { r /= 255; g /= 255; b /= 255; var max = Math.max(r, g, b), min = Math.min(r, g, b); var h, s, l = (max + min) / 2; if(max === min) { h = s = 0; // achromatic } else { var d = max - min; s = l > 0.5 ? d / (2 - max - min) : d / (max + min); switch(max) { case r: h = (g - b) / d + (g < b ? 6 : 0); break; case g: h = (b - r) / d + 2; break; case b: h = (r - g) / d + 4; break; } h /= 6; } return [h, s, l]; } // Init vars var result = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; var rgb = [0, 0, 0]; var sat = 70; var lum = 68; var modulo = 16; // Splitting evenly the string for(var i in hash) { result[i%modulo] = result[i%modulo] + parseInt(hash.charAt(i), 16).toString(); } // Converting our data into a usable rgb format // Start at 1 because 16%3=1 but 15%3=0 and makes the repartition even for(var count=1;count= 200) { sat = 60; } return [parseInt(hsl[0] * 360), sat, lum]; }; $.fn.imageplaceholder = function(seed, text, size) { text = text || seed; // Compute the hash var hsl = seed.toHsl(); this.css('background-color', 'hsl('+hsl[0]+', '+hsl[1]+'%, '+hsl[2]+'%)'); // Placeholders are square var height = this.height() || size || 32; this.height(height); this.width(height); // CSS rules this.css('color', '#fff'); this.css('font-weight', 'normal'); this.css('text-align', 'center'); // calculate the height this.css('line-height', height + 'px'); this.css('font-size', (height * 0.55) + 'px'); if(seed !== null && seed.length) { this.html(text[0].toUpperCase()); } }; }(jQuery));