1 function perc2color(perc) {
2            var r, g, b = 0;
3            if (perc < 50) {
4                r = 255;
5                g = Math.round(5.1 * perc);
6            }
7            else {
8                g = 255;
9                r = Math.round(510 - 5.10 * perc);
10            }
11            var h = r * 0x10000 + g * 0x100 + b * 0x1;
12            return '#' + ('000000' + h.toString(16)).slice(-6);
13        }