相关疑难解决方法(0)

我试图用两个表示形状和颜色的图例来制作地图(下面的例子中为"Type"和"Org"),并且有图例插图.我可以放置传说,但我希望它们左对齐,以便它们的左边缘对齐.除了相互集中之外,我无法做出任何其他事情:

require(ggplot2)
require(ggmap)
require(grid)
require(mapproj)

data <- data.frame(Org=rep(c("ABCDEFG","HIJKLMNOP","QRSTUVWX"),4)
                   , Type=rep(c("Y","Z"),6), Lat=runif(12,48,54.5)
                   , Long=runif(12,-133.5,-122.5))

osmMap <- get_map(location=c(-134,47.5,-122,55), source = 'osm')

points <- geom_jitter(data=data, aes(Long, Lat, shape=Type
                                     , colour=Org))

legend <- theme(legend.justification=c(0,0), legend.position=c(0,0)
                , legend.margin=unit(0,"lines"), legend.box="vertical"
                , legend.key.size=unit(1,"lines"), legend.text.align=0
                , legend.title.align=0)

ggmap(osmMap) + points + legend