alwaysCalculateColorDomain

[gordonwoodhull]

The most common use case for calculateColorDomain is

chart.on('preRedraw', function() {
    chart.calculateColorDomain();
});

Why not make that an option?

[gordonwoodhull]

See e.g.

https://github.com/att/rcloud.dcmap/blob/master/inst/javascript/rcloud.dcmap.js#L147-152
http://stackoverflow.com/a/37532772/676195