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112 lines
1.7 KiB
JavaScript
112 lines
1.7 KiB
JavaScript
'use strict';
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var s = [0x0000, 0x0000, 0x0000, 0x0000];
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function mul(a, b) {
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var r = [0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000];
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for (var j = 0; j < 4; j++) {
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var k = 0;
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for (var i = 0; i < 4; i++) {
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var t = a[i] * b[j] + r[i+j] + k;
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r[i+j] = t & 0xffff;
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k = t >>> 16;
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}
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r[j+4] = k;
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}
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r.length = 4;
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return r;
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}
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function add(a, n) {
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var r = [0x0000, 0x0000, 0x0000, 0x0000],
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k = n;
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for (var i = 0; i < 4; i++) {
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var t = a[i] + k;
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r[i] = t & 0xffff;
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k = t >>> 16;
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}
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return r;
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}
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function shr(a, n) {
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var r = [a[0], a[1], a[2], a[3], 0x0000],
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i = 4,
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k = 0;
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for (; n > 16; n -= 16, i--)
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for (var j = 0; j < 4; j++)
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r[j] = r[j+1];
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for (; i > 0; i--) {
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var s = r[i-1];
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r[i-1] = (s >>> n) | k;
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k = ((s & ((1 << n) - 1)) << (16 - n));
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}
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r.length = 4;
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return r;
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}
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return L.Class.extend({
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seed: function(n) {
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n = (n - 1)|0;
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s[0] = n & 0xffff;
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s[1] = n >>> 16;
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s[2] = 0;
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s[3] = 0;
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},
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int: function() {
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s = mul(s, [0x7f2d, 0x4c95, 0xf42d, 0x5851]);
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s = add(s, 1);
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var r = shr(s, 33);
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return (r[1] << 16) | r[0];
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},
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get: function() {
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var r = (this.int() % 0x7fffffff) / 0x7fffffff, l, u;
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switch (arguments.length) {
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case 0:
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return r;
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case 1:
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l = 1;
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u = arguments[0]|0;
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break;
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case 2:
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l = arguments[0]|0;
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u = arguments[1]|0;
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break;
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}
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return Math.floor(r * (u - l + 1)) + l;
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},
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derive_color: function(string) {
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this.seed(parseInt(sfh(string), 16));
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var r = this.get(128),
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g = this.get(128),
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min = 0,
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max = 128;
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if ((r + g) < 128)
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min = 128 - r - g;
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else
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max = 255 - r - g;
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var b = min + Math.floor(this.get() * (max - min));
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return '#%02x%02x%02x'.format(0xff - r, 0xff - g, 0xff - b);
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}
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});
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