Function planarRingArea

docs/app/js/sanddance-app.js:109687–109691

(ring)

var _stitchJs = require("./stitch.js");
var _stitchJsDefault = parcelHelpers.interopDefault(_stitchJs);
function planarRingArea(ring) {
    var i = -1, n = ring.length, a, b = ring[n - 1], area = 0;
    while(++i < n)a = b, b = ring[i], area += a[0] * b[1] - a[1] * b[0];
    return Math.abs(area); // Note: doubled area!
}
exports.default = function(topology) {
    return (0, _featureJs.object)(topology, mergeArcs.apply(this, arguments));
};