Function zoomLog

docs/app/js/sanddance-app.js:106715–106718

(domain, anchor, scale)

    return zoom(domain, anchor, scale, toNumber, identity);
}
function zoomLog(domain, anchor, scale) {
    const sign = Math.sign(domain[0]);
    return zoom(domain, anchor, scale, log(sign), exp(sign));
}
function zoomPow(domain, anchor, scale, exponent) {
    return zoom(domain, anchor, scale, pow(exponent), pow(1 / exponent));
}