Function polymap

docs/app/js/sanddance-app.js:127493–127508

(domain, range, interpolate)

    };
}
function polymap(domain, range, interpolate) {
    var j = Math.min(domain.length, range.length) - 1, d = new Array(j), r = new Array(j), i1 = -1;
    // Reverse descending domains.
    if (domain[j] < domain[0]) {
        domain = domain.slice().reverse();
        range = range.slice().reverse();
    }
    while(++i1 < j){
        d[i1] = normalize(domain[i1], domain[i1 + 1]);
        r[i1] = interpolate(range[i1], range[i1 + 1]);
    }
    return function(x) {
        var i = (0, _d3Array.bisect)(domain, x, 1, j) - 1;
        return r[i](d[i](x));
    };
}
function copy(source, target) {
    return target.domain(source.domain()).range(source.range()).interpolate(source.interpolate()).clamp(source.clamp()).unknown(source.unknown());
}