將顏色條的標題設置爲ggplot2中的白色

Question

如果我有scale_fill_coninuous(name='Servings')並且我希望它是白色的。我怎樣才能爲此設置一個主題參數？在上面的代碼中添加color ='white'不起作用。這是我的ggplot。

ggplot() + 
    geom_map(data = map.world,map = map.world,colour='white',size=.25, aes(
    map_id = region, 
    x=long, 
    y=lat, 
    fill=beer_servings 
)) + 
    theme(panel.grid.major = element_blank(), 
     panel.grid.minor = element_blank(), 
     axis.title.x=element_blank(), 
     axis.text.x=element_blank(), 
     axis.ticks.x=element_blank(), 
     axis.title.y=element_blank(), 
     axis.text.y=element_blank(), 
     axis.ticks.y=element_blank(), 
     plot.background = element_rect(fill = "black"), 
     panel.background = element_rect(fill = "black"), 
     legend.background = element_rect(fill='black', 
             size=0.5, linetype="solid"), 
     legend.text = element_text(colour = 'white'), 
     legend.position = 'bottom' 
     )+ 
    scale_fill_continuous(name = "Servings Of Beer \nPer Person, 2010")+ 
    #guides(fill = guide_legend(
    #title.theme = element_text(size=10, colour = "white",angle = 0)))+ 
    coord_quickmap() 

Answer 1

對不起，找到它。

theme(legend.title = 
    element_text(face = "italic", size = 12, angle = 45, color = "grey70"))