How can I draw something in the background of a ggplot?

Question

I'm working on making shot charts for basketball. I need to figure out how to actually draw the outline of a basketball court in the background. Any ideas?

enter image description here

Cool question. You could do something with `+ geom_path(data=)`, if you know how a basket ball court is laid out. Check http://stackoverflow.com/questions/9805895/mapping-the-world-on-ggplot2 for ideas (replace `geom_polygon` with `geom_path`). — naught101, Oct 09 '12 at 05:13
@EvanZamir: you should post that last image with the code in an answer. — naught101, Oct 09 '12 at 06:16

score 7 · Accepted Answer · answered Oct 09 '12 at 15:03

enter image description here

The following code was used to get this image:


    ggplot(shots, aes(X,Y)) + stat_binhex(binwidth=c(3,3)) + 
    geom_point(size=3, alpha=0.5, aes(color=RESULT), position="jitter") + 
    coord_equal() + theme_grey() + opts(title="Golden State Warriors 2012 Shot Chart") + 
    geom_path(data=ft_line, aes(x,y), colour="white", size=2) + 
    geom_path(data=court, aes(x,y), colour="white", size=2)

The data in the geom_path commands contains the (x,y) coords for the white court diagram.

How can I draw something in the background of a ggplot?

1 Answers1