如何刪除從圖例邊框沒有從柱狀圖中GGPLOT2

Question

去除邊框我有以下情節：

library(reshape) 
library(ggplot2) 
library(gridExtra) 
require(ggplot2) 



data2<-structure(list(IR = structure(c(4L, 3L, 2L, 1L, 4L, 3L, 2L, 1L 
), .Label = c("0.13-0.16", "0.17-0.23", "0.24-0.27", "0.28-1" 
), class = "factor"), variable = structure(c(1L, 1L, 1L, 1L, 
2L, 2L, 2L, 2L), .Label = c("Real queens", "Simulated individuals" 
), class = "factor"), value = c(15L, 11L, 29L, 42L, 0L, 5L, 21L, 
22L), Legend = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L), .Label = c("Real queens", 
"Simulated individuals"), class = "factor")), .Names = c("IR", 
"variable", "value", "Legend"), row.names = c(NA, -8L), class = "data.frame") 
p <- ggplot(data2, aes(x =factor(IR), y = value, fill = Legend, width=.15)) 


data3<-structure(list(IR = structure(c(4L, 3L, 2L, 1L, 4L, 3L, 2L, 1L 
), .Label = c("0.13-0.16", "0.17-0.23", "0.24-0.27", "0.28-1" 
), class = "factor"), variable = structure(c(1L, 1L, 1L, 1L, 
2L, 2L, 2L, 2L), .Label = c("Real queens", "Simulated individuals" 
), class = "factor"), value = c(2L, 2L, 6L, 10L, 0L, 1L, 4L, 
4L), Legend = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L), .Label = c("Real queens", 
"Simulated individuals"), class = "factor")), .Names = c("IR", 
"variable", "value", "Legend"), row.names = c(NA, -8L), class = "data.frame") 
q<- ggplot(data3, aes(x =factor(IR), y = value, fill = Legend, width=.15)) 


##the plot## 
q + geom_bar(position='dodge', colour='black') + ylab('Frequency') + 
     xlab('IR')+scale_fill_grey() + 
     theme(axis.text.x=element_text(colour="black"), 
     axis.text.y=element_text(colour="Black"))+ 
     opts(title='', panel.grid.major = theme_blank(),panel.grid.minor = 
     theme_blank(),panel.border = theme_blank(),panel.background = 
     theme_blank(), axis.ticks.x = theme_blank()) 

我想保持黑色邊框效果

geom_bar(colour='black) 

不具有奇怪的對角線穿過圖例中描繪的方塊。有什麼辦法可以去除那些對角線或刪除對角線？

Answer 1

正如Didzis Elferts提到的，這是一個here（最後一個例子）的例子。

訣竅是疊加兩張圖：第一張圖以所需方式照顧圖例，第二張圖缺少圖例，但爲實際圖本身添加邊框。