geom_hex: Add weight parameter [feature request]

[sjackman]

Please consider adding a weight parameter to geom_hex, similar to geom_bin2d. Thanks!

[hadley]

It's already supported?

[sjackman]

Ah, I was confused. Thanks. weight is not listed in the aesthetics for neither geom_bin2d nor geom_hex. Should it be?
http://docs.ggplot2.org/current/geom_bin2d.html
http://docs.ggplot2.org/current/geom_hex.html

[hadley]

Yes! Want to do a PR?

[sjackman]

Sure. Can do.