3
function d3_scaleExtent(domain) {
4
var start = domain[0], stop = domain[domain.length - 1];
5
return start < stop ? [start, stop] : [stop, start];
8
function d3_scaleRange(scale) {
9
return scale.rangeExtent ? scale.rangeExtent() : d3_scaleExtent(scale.range());