How to use ggplot2 facet colors and shapes?

问题

Maybe, I missed something in the ggplot grammar. The following 3 facets can be plotted without any error. Unfortuantely, the facet plots mixed up colors and shapes. The right hand column should show blue markers only, while the center one should have green markers.

data1
num     delay claim supply project
1 -236.347551  3000    DIF   site1
2   65.132011  5000    Hoc   site2
3   61.401260  5000    Hoc   site2
4   96.902894   500    Hoc   site2
..
base04 <- ggplot(data1, aes(num, delay, size=claim, color=supply, shape=project))
base04 + geom_point() + facet_grid( . ~ supply ) 
base04 + geom_point() + facet_grid( project ~ . )
base04 + geom_point() + facet_grid( project ~ supply )

Many thanks for your ideas ..

来源：https://stackoverflow.com/questions/44724108/how-to-use-ggplot2-facet-colors-and-shapes