Function centroidPointFirstLine

docs/app/js/sanddance-app.js:133581–133584

(x, y)

    centroidStream.point = centroidPointFirstLine;
}
function centroidPointFirstLine(x, y) {
    centroidStream.point = centroidPointLine;
    centroidPoint(x0 = x, y0 = y);
}
function centroidPointLine(x, y) {
    var dx = x - x0, dy = y - y0, z = (0, _mathJs.sqrt)(dx * dx + dy * dy);
    X1 += z * (x0 + x) / 2;