152 lines
4.0 KiB
JavaScript
152 lines
4.0 KiB
JavaScript
/**
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* ownCloud
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*
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* @author John Molakvoæ
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* @copyright 2016 John Molakvoæ <fremulon@protonmail.com>
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* @author Morris Jobke
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* @copyright 2013 Morris Jobke <morris.jobke@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library 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
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* Adds a background color to the element called on and adds the first character
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* of the passed in string. This string is also the seed for the generation of
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* the background color.
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*
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* You have following HTML:
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*
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* <div id="albumart"></div>
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*
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* And call this from Javascript:
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*
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* $('#albumart').imageplaceholder('The Album Title');
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*
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* Which will result in:
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*
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* <div id="albumart" style="background-color: hsl(123, 90%, 65%); ... ">T</div>
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*
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* You may also call it like this, to have a different background, than the seed:
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*
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* $('#albumart').imageplaceholder('The Album Title', 'Album Title');
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*
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* Resulting in:
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*
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* <div id="albumart" style="background-color: hsl(123, 90%, 65%); ... ">A</div>
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*
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*/
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/*
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* Alternatively, you can use the prototype function to convert your string to hsl colors:
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*
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* "a6741a86aded5611a8e46ce16f2ad646".toHsl()
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*
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* Will return the hsl parameters within an array:
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*
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* [290, 60, 68]
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*
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*/
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(function ($) {
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String.prototype.toHsl = function() {
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var hash = this.toLowerCase().replace(/[^0-9a-f]+/g, '');
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// Already a md5 hash?
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if( !hash.match(/^[0-9a-f]{32}$/g) ) {
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hash = md5(hash);
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}
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function rgbToHsl(r, g, b) {
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r /= 255; g /= 255; b /= 255;
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var max = Math.max(r, g, b), min = Math.min(r, g, b);
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var h, s, l = (max + min) / 2;
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if(max === min) {
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h = s = 0; // achromatic
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} else {
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var d = max - min;
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s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
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switch(max) {
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case r: h = (g - b) / d + (g < b ? 6 : 0); break;
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case g: h = (b - r) / d + 2; break;
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case b: h = (r - g) / d + 4; break;
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}
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h /= 6;
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}
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return [h, s, l];
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}
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// Init vars
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var result = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
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var rgb = [0, 0, 0];
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var sat = 70;
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var lum = 68;
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var modulo = 16;
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// Splitting evenly the string
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for(var i in hash) {
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result[i%modulo] = result[i%modulo] + parseInt(hash.charAt(i), 16).toString();
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}
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// Converting our data into a usable rgb format
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// Start at 1 because 16%3=1 but 15%3=0 and makes the repartition even
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for(var count=1;count<modulo;count++) {
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rgb[count%3] += parseInt(result[count]);
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}
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// Reduce values bigger than rgb requirements
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rgb[0] = rgb[0]%255;
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rgb[1] = rgb[1]%255;
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rgb[2] = rgb[2]%255;
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var hsl = rgbToHsl(rgb[0], rgb[1], rgb[2]);
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// Classic formulla to check the brigtness for our eye
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// If too bright, lower the sat
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var bright = Math.sqrt( 0.299 * Math.pow(rgb[0], 2) + 0.587 * Math.pow(rgb[1], 2) + 0.114 * Math.pow(rgb[2], 2) );
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if (bright >= 200) {
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sat = 60;
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}
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return [parseInt(hsl[0] * 360), sat, lum];
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};
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$.fn.imageplaceholder = function(seed, text, size) {
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text = text || seed;
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// Compute the hash
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var hsl = seed.toHsl();
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this.css('background-color', 'hsl('+hsl[0]+', '+hsl[1]+'%, '+hsl[2]+'%)');
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// Placeholders are square
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var height = this.height() || size || 32;
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this.height(height);
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this.width(height);
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// CSS rules
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this.css('color', '#fff');
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this.css('font-weight', 'normal');
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this.css('text-align', 'center');
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// calculate the height
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this.css('line-height', height + 'px');
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this.css('font-size', (height * 0.55) + 'px');
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if(seed !== null && seed.length) {
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this.html(text[0].toUpperCase());
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}
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};
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}(jQuery));
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