I begin to suspect we need a dedicated syntax (sub-clause to DRAW) that encompasses the idea of overwriting the literal value of an aesthetic based on a condition. I think it needs to live separately because it needs to work both for mapped and set values and after scaling has been applied. While it is nice in itself for static plots (i.e. easy lowering of opacity on a group of background observations) I think it will be integral to a future dynamic grammar in order to describe rich hover and select behavior
I begin to suspect we need a dedicated syntax (sub-clause to DRAW) that encompasses the idea of overwriting the literal value of an aesthetic based on a condition. I think it needs to live separately because it needs to work both for mapped and set values and after scaling has been applied. While it is nice in itself for static plots (i.e. easy lowering of opacity on a group of background observations) I think it will be integral to a future dynamic grammar in order to describe rich hover and select behavior