More than six shapes in ggplot

Question

I would like to plot lines with different shapes with more than six sets of data, using discrete colors. The problems are 1) a different legend is generated for line color and

Answer 1

you can get about a hundred different shapes if you need them. good.shapes is a vector of the shape numbers that render on my screen without any fill argument.

library(ggplot2)
N = 100; M = 1000
good.shapes = c(1:25,33:127)
foo = data.frame( x = rnorm(M), y = rnorm(M), s = factor( sample(1:N, M, replace = TRUE) ) )
ggplot(aes(x,y,shape=s ), data=foo ) +
    scale_shape_manual(values=good.shapes[1:N]) +
        geom_point()