Function centroidRingPointFirst

docs/app/js/sanddance-app.js:132346–132355

(lambda, phi)

    centroidStream.point = centroidPoint;
}
function centroidRingPointFirst(lambda, phi) {
    lambda00 = lambda, phi00 = phi;
    lambda *= (0, _mathJs.radians), phi *= (0, _mathJs.radians);
    centroidStream.point = centroidRingPoint;
    var cosPhi = (0, _mathJs.cos)(phi);
    x0 = cosPhi * (0, _mathJs.cos)(lambda);
    y0 = cosPhi * (0, _mathJs.sin)(lambda);
    z0 = (0, _mathJs.sin)(phi);
    centroidPointCartesian(x0, y0, z0);
}
function centroidRingPoint(lambda, phi) {
    lambda *= (0, _mathJs.radians), phi *= (0, _mathJs.radians);
    var cosPhi = (0, _mathJs.cos)(phi), x = cosPhi * (0, _mathJs.cos)(lambda), y = cosPhi * (0, _mathJs.sin)(lambda), z = (0, _mathJs.sin)(phi), cx = y0 * z - z0 * y, cy = z0 * x - x0 * z, cz = x0 * y - y0 * x, m = (0, _mathJs.hypot)(cx, cy, cz), w = (0, _mathJs.asin)(m), v = m && -w / m; // area weight multiplier