这是我的条形图的一个简单示例：
x <- data.frame(aa=c(0.2,0.6,0.1), dd = c(1,2,3))
x <- melt(x, "dd")
y <- data.frame(bb=c(0.4,0.5), dd = c(1,2))
y <- melt(y, "dd")
z <- data.frame(cc=c(0.5,0.25,0.1,0.05), dd = c(1,2,3,4))
z <- melt(z, "dd")
x=rbind(x,y,z)
col=c("white","grey","blue","white","red","white","green","blue","green")
ggplot(x, aes(x = variable, y = value)) + geom_bar(stat = "identity", fill = col)
我想知道是否有一种方法可以使我的条具有圆形末端，就像线条的 lineend 选项一样（http://sape.inf.usi.ch/quick-reference/ggplot2/lineend) ?
这是一个示例，其中条形末端为圆形，与几何线(geom_path)，作为一个最小的例子。
df1 <- data.frame( x=c(1,1,2,2,3,3),
y=c(1,7,1,4,1,5),
chr=c("one","one","two","two","three","three") )
ggplot( df1, aes(x,y, col=chr) ) + geom_line( lineend="round", lwd=10 )
