Feature: default avatar color based on hash of name

[LasseRafn]

Thanks for adding this! 👍 I’ll put some work into this

[HsRealDev]

Not sure if it's any help, but here is a piece of code what I'm currently using to create/calculate background and font colors based on the hash of name (so that they still stay constant throughout the application):

$backgrounColor = substr(md5($userId)), 0, 6);
$fontColor = 'fff';

$colors = [
    'red'   => base_convert(substr($backgrounColor, 0, 2), 16, 10),
    'green' => base_convert(substr($backgrounColor, 2, 2), 16, 10),
    'blue'  => base_convert(substr($backgrounColor, 4, 2), 16, 10)
];

// Custom - more light - calculation for fontcolor. 
// This was found somewhere from interwebz but cannot find the url. 
// So cannot give the thanks to right person. :(
if(($colors['red'] * 0.299 + $colors['green'] * 0.587 + $colors['blue'] * 0.114) > 186) {
    $fontColor = '000';
}

// Contrast calculation based on the W3C Recommendations - https://www.w3.org/TR/WCAG20/
// foreach ($colors as $colorCode => $colorValue) {
//    $c = $colorValue / 255;
//    if($c <= 0.03928) {
//       $colors[$colorCode] = $c / 12.92;
//    } else {
//       $colors[$colorCode] = (($c+0.055)/1.055) ^ 2.4;
//    }
// }
//            
// $luminance = 0.2126 * $colors['red'] + 
//              0.7152 * $colors['green'] + 
//              0.0722 * $colors['blue'];
//            
// if($luminance > 0.179) {
//     $fontColor = '000';
// }

[3D-I]

I am really interested in using this kind of approach and maybe also a randomness of sort, may I use/modify the present code giving credits where those are due? Thx.

Could the snippet make the use of more colors related to letters (say 23 or so on)? Didn't accurately read/tested it..

[LasseRafn]

Thanks you so much for this, @HsRealDev! I will test this and maybe make some adjustments (haven't tested it yet)

[HsRealDev]

@3D-I - yes, of course you can use it and modify as much as you want. I'm using that to call Lasse's awesome api in my proof of concept projects and I calculate the color always based on the user's ID (in my case MongoId). This way the the avatar's will look like "random" but still be always the same for the user throughout the app.

[HsRealDev]

@LasseRafn You are welcome! Good to hear I could be some help back since your API saved me some hours :-)

[3D-I]

Another interesting function related and very similar. That's JS though.

https://github.com/tcat-tamu/sda.site.web/blob/342fde2e3d840e317b9e0931594c36e165a7c3ba/apps/site/src/app/vwise/components/panel/panel.directive.js#L177

[3D-I]

Any news on this? I am bound to rewrite my phpBB extension from scratch and I will be more than happy to have this function working. Thanks.