colors.js

js ieepo.gob.mx collected 2026-09-25 01:41:43 UTC 647 bytes, 39 lines download raw bytes

1'use strict';
2
3function LightenDarkenColor(col, amt) {
4
5    var usePound = false;
6
7    if (col[0] === '#') {
8        col = col.slice(1);
9        usePound = true;
10    }
11
12    var num = parseInt(col,16);
13
14    var r = (num >> 16) + amt;
15
16    if (r > 255) r = 255;
17    else if  (r < 0) r = 0;
18
19    var b = ((num >> 8) & 0x00FF) + amt;
20
21    if (b > 255) {
22      b = 255;
23    }
24    else if  (b < 0) {
25      b = 0;
26    }
27
28    var g = (num & 0x0000FF) + amt;
29
30    if (g > 255) {
31      g = 255;
32    }
33    else if (g < 0) {
34      g = 0;
35    }
36
37    return (usePound?'#':'') + (g | (b << 8) | (r << 16)).toString(16);
38
39}

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