Function zoom

docs/app/js/sanddance-app.js:106705–106711

(domain, anchor, scale, lift, ground)

    return pan(domain, delta, symlog(constant1), symexp(constant1));
}
function zoom(domain, anchor, scale, lift, ground) {
    const d0 = lift(domain[0]), d1 = lift(peek(domain)), da = anchor != null ? lift(anchor) : (d0 + d1) / 2;
    return [
        ground(da + (d0 - da) * scale),
        ground(da + (d1 - da) * scale)
    ];
}
function zoomLinear(domain, anchor, scale) {
    return zoom(domain, anchor, scale, toNumber, identity);
}