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New algorithm

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Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
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John Molakvoæ (skjnldsv) 2018-02-26 11:59:34 +01:00
parent e970e9f710
commit bca8d83f02
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GPG key ID: 60C25B8C072916CF
1 changed files with 57 additions and 49 deletions
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106
core/js/placeholder.js
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@ -61,8 +61,7 @@
(function ($) {
String.prototype.toHsl = function() {
String.prototype.toRgb = function() {
var hash = this.toLowerCase().replace(/[^0-9a-f]+/g, '');
// Already a md5 hash?
@ -70,65 +69,74 @@
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;
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 (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 [h, s, l];
return palette;
}
// 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;
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;
// Splitting evenly the string
for(var i in hash) {
result[i%modulo] = result[i%modulo] + parseInt(hash.charAt(i), 16).toString();
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 final = 0;
var result = Array();
// Splitting evenly the string
for (var i in hash) {
// chars in md5 goes up to f, hex:16
result.push(parseInt(hash.charAt(i), 16) % 16);
}
// Adds up all results
for (var i in result) {
final += result[i];
}
// chars in md5 goes up to f, hex:16
return parseInt(final % maximum);
}
// 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]);
}
// Reduce values bigger than rgb requirements
rgb[0] = rgb[0]%255;
rgb[1] = rgb[1]%255;
rgb[2] = rgb[2]%255;
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;
}
return [parseInt(hsl[0] * 360), sat, lum];
return finalPalette[hashToInt(hash, steps * 3 )];
};
$.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]+'%)');
var rgb = seed.toRgb();
this.css('background-color', 'rgb('+rgb.r+', '+rgb.g+', '+rgb.b+')');
// Placeholders are square
var height = this.height() || size || 32;