| Current Path : /home/emeraadmin/public_html/node_modules/d3-polygon/src/ |
| Current File : /home/emeraadmin/public_html/node_modules/d3-polygon/src/length.js |
export default function(polygon) {
var i = -1,
n = polygon.length,
b = polygon[n - 1],
xa,
ya,
xb = b[0],
yb = b[1],
perimeter = 0;
while (++i < n) {
xa = xb;
ya = yb;
b = polygon[i];
xb = b[0];
yb = b[1];
xa -= xb;
ya -= yb;
perimeter += Math.sqrt(xa * xa + ya * ya);
}
return perimeter;
}