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Merge pull request #23638 from owncloud/new-placeholder-colours-generator 

New colour generator
This commit is contained in:
Jan-Christoph Borchardt 2016-04-03 12:26:22 +02:00
parent deca08a683 dcc28a3ad7
commit a0e2eae7de
1 changed files with 56 additions and 6 deletions
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62
core/js/placeholder.js
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@ -1,6 +1,8 @@
/**
* ownCloud
*
* @author John Molakvoæ
* @copyright 2016 John Molakvoæ <fremulon@protonmail.com>
* @author Morris Jobke
* @copyright 2013 Morris Jobke <morris.jobke@gmail.com>
*
@ -48,16 +50,64 @@
(function ($) {
$.fn.imageplaceholder = function(seed, text, size) {
// set optional argument "text" to value of "seed" if undefined
text = text || seed;
var hash = md5(seed).substring(0, 4),
maxRange = parseInt('ffff', 16),
hue = parseInt(hash, 16) / maxRange * 256,
height = this.height() || size || 32;
this.css('background-color', 'hsl(' + hue + ', 90%, 65%)');
var hash = seed.toLowerCase().replace(/[^0-9a-f]+/g, '');
// Already a md5 hash?
if( !hash.match(/^[0-9a-f]{32}$/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 = 80;
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<modulo;count++) {
rgb[count%3] += parseInt(result[count]);
}
var hsl = rgbToHsl(rgb[0], rgb[1], rgb[2]);
// Classic formulla to check the brigtness for our eye
// If too bright, lower the sat
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) );
if (bright >= 200) {
sat = 60;
}
var hue = parseInt(hsl[0] * 360);
this.css('background-color', 'hsl('+hue+', '+sat+'%, '+lum+'%)');
// Placeholders are square
var height = this.height() || size || 32;
this.height(height);
this.width(height);