1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/**
* ownCloud
*
* @author John Molakvoæ
* @copyright 2016-2018 John Molakvoæ <skjnldsv@protonmail.com>
* @author Morris Jobke
* @copyright 2013 Morris Jobke <morris.jobke@gmail.com>
*
* 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 <http://www.gnu.org/licenses/>.
*
*/
/*
* 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:
*
* <div id="albumart"></div>
*
* And call this from Javascript:
*
* $('#albumart').imageplaceholder('The Album Title');
*
* Which will result in:
*
* <div id="albumart" style="background-color: rgb(121, 90, 171); ... ">T</div>
*
* You may also call it like this, to have a different background, than the seed:
*
* $('#albumart').imageplaceholder('The Album Title', 'Album Title');
*
* Resulting in:
*
* <div id="albumart" style="background-color: rgb(121, 90, 171); ... ">A</div>
*
*/
/*
* Alternatively, you can use the prototype function to convert your string to rgb colors:
*
* "a6741a86aded5611a8e46ce16f2ad646".toRgb()
*
* Will return the rgb parameters within the following object:
*
* Color {r: 208, g: 158, b: 109}
*
*/
(function ($) {
String.prototype.toRgb = function() {
// Normalize hash
var hash = this.toLowerCase();
// Already a md5 hash?
if( hash.match(/^([0-9a-f]{4}-?){8}$/) === null ) {
hash = md5(hash);
}
hash = hash.replace(/[^0-9a-f]/g, '');
function Color(r,g,b) {
this.r = r;
this.g = g;
this.b = b;
}
function stepCalc(steps, ends) {
var step = new Array(3);
step[0] = (ends[1].r - ends[0].r) / steps;
step[1] = (ends[1].g - ends[0].g) / steps;
step[2] = (ends[1].b - ends[0].b) / steps;
return step;
}
function mixPalette(steps, color1, color2) {
var count = steps + 1;
var palette = new Array();
palette.push(color1);
var step = stepCalc(steps, [color1, color2])
for (var i = 1; i < steps; i++) {
var r = parseInt(color1.r + (step[0] * i));
var g = parseInt(color1.g + (step[1] * i));
var b = parseInt(color1.b + (step[2] * i));
palette.push(new Color(r,g,b));
}
return palette;
}
var red = new Color(182, 70, 157);
var yellow = new Color(221, 203, 85);
var blue = new Color(0, 130, 201); // Nextcloud blue
// Number of steps to go from a color to another
// 3 colors * 6 will result in 18 generated colors
var steps = 6;
var palette1 = mixPalette(steps, red, yellow);
var palette2 = mixPalette(steps, yellow, blue);
var palette3 = mixPalette(steps, blue, red);
var finalPalette = palette1.concat(palette2).concat(palette3);
// Convert a string to an integer evenly
function hashToInt(hash, maximum) {
var finalInt = 0;
var result = Array();
// Splitting evenly the string
for (var i=0; i<hash.length; i++) {
// chars in md5 goes up to f, hex:16
result.push(parseInt(hash.charAt(i), 16) % 16);
}
// Adds up all results
for (var j in result) {
finalInt += result[j];
}
// chars in md5 goes up to f, hex:16
// make sure we're always using int in our operation
return parseInt(parseInt(finalInt) % maximum);
}
return finalPalette[hashToInt(hash, steps * 3 )];
};
$.fn.imageplaceholder = function(seed, text, size) {
text = text || seed;
// Compute the hash
var rgb = seed.toRgb();
this.css('background-color', 'rgb('+rgb.r+', '+rgb.g+', '+rgb.b+')');
// 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());
}
};
$.fn.clearimageplaceholder = function() {
this.css('background-color', '');
this.css('color', '');
this.css('font-weight', '');
this.css('text-align', '');
this.css('line-height', '');
this.css('font-size', '');
this.html('');
this.removeClass('icon-loading');
this.removeClass('icon-loading-small');
};
}(jQuery));
|
