我正在测试在 ggplot2 中构建双 y 轴图的函数。它有效,但我无法从输入图形中获取一些元素。我用两个数据框 Base1
和 Base2
构建了这两个图(我在最后一部分添加了 dput()
版本):
library(ggplot2)
library(scales)
library(gtable)
#Graph 1
g1<-ggplot(Base1, aes(x = Month, y = value, fill = variable)) +
geom_bar(stat="identity",colour="black",size=1) +
scale_y_continuous(labels = comma,breaks=pretty_breaks(n=7),
limits=c(0,max(Base1$value,na.rm=T))) +
theme(axis.text.x=element_text(angle=90,colour="grey20",face="bold",size=12),
axis.text.y=element_text(colour="grey20",face="bold",hjust=1,vjust=0.8,size=15),
axis.title.x=element_text(colour="grey20",face="bold",size=16),
axis.title.y=element_text(colour="grey20",face="bold",size=16)) +
xlab('Month')+ylab('')+ ggtitle("My graph") +
theme(plot.title = element_text(lineheight=3, face="bold", color="black",size=24)) +
theme(legend.text=element_text(size=14),
legend.title=element_text(size=14)) +
scale_fill_manual(name = "variable",
label = "Power",
values = "#FF6C91")
第二个:
#Graph2
colors=c("red","darkgreen")
g2<-ggplot(Base2, aes(x=Month, y=value, color=variable))+
geom_line(aes(group=variable),size=1.3) +
geom_point(size=3.8, shape=21, fill="white") +
scale_color_manual(values=colors)+ ggtitle("My graph")
有了这两个图形,我使用了下一个函数两个来制作双 y 轴图:
double_axis_graph <- function(graf1,graf2){
graf1 <- graf1
graf2 <- graf2
gtable1 <- ggplot_gtable(ggplot_build(graf1))
gtable2 <- ggplot_gtable(ggplot_build(graf2))
par <- c(subset(gtable1[['layout']], name=='panel', select=t:r))
graf <- gtable_add_grob(gtable1, gtable2[['grobs']][[which(gtable2[['layout']][['name']]=='panel')]],
par['t'],par['l'],par['b'],par['r'])
ia <- which(gtable2[['layout']][['name']]=='axis-l')
ga <- gtable2[['grobs']][[ia]]
ax <- ga[['children']][[2]]
ax[['widths']] <- rev(ax[['widths']])
ax[['grobs']] <- rev(ax[['grobs']])
ax[['grobs']][[1]][['x']] <- ax[['grobs']][[1]][['x']] - unit(1,'npc') + unit(0.15,'cm')
graf <- gtable_add_cols(graf, gtable2[['widths']][gtable2[['layout']][ia, ][['l']]], length(graf[['widths']])-1)
graf <- gtable_add_grob(graf, ax, par['t'], length(graf[['widths']])-1, par['b'])
return(graf)
}
所以,当我用它来构建双轴图时,结果显示了双轴,但我无法从输入图形中获取其他元素作为完整的图例;此外,当我加入图表时,只显示其中一个,而另一个丢失。我应用了具有下一个结果的函数:
plot(double_axis_graph(g1,g2))
在这种情况下,条形图形 (
g1
) 消失了,我无法使用 g2
中的元素完成图例。两个轴工作正常。在第二次测试中,我得到了这个结果:plot(double_axis_graph(g2,g1))
在这种情况下,我丢失了来自
g2
的系列,并且图例没有来自 g1
的元素。我想完成功能以显示图形中所有系列的图例中的图形和元素。我的数据帧的 dput()
版本是下一个:Base1<-structure(list(Month = c("m11", "m12", "m13", "m14", "m15", "m16"
), variable = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = "Power", class = "factor"),
value = c(28101696.45, 28606983.44, 30304944, 32583849.36,
34791542.82, 40051050.24)), .Names = c("Month", "variable",
"value"), row.names = c(NA, -6L), class = "data.frame")
Base2<-structure(list(Month = c("m11", "m12", "m13", "m14", "m15", "m16",
"m11", "m12", "m13", "m14", "m15", "m16"), variable = structure(c(1L,
1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("Index1",
"Index2"), class = "factor"), value = c(0.044370892419913, 0.0437161234641523,
0.0516857394621815, 0.0495793011485982, 0.0506456741259283, 0.0314653057147897,
0.0299405579124744, 0.0296145768664101, 0.0269727649059507, 0.0250663815369419,
0.0233469715385275, 0.0201801611981898)), .Names = c("Month",
"variable", "value"), row.names = c(NA, -12L), class = "data.frame")
非常感谢您的帮助!
最佳答案
解决方案的第一步:
g1.1 <- g1 + theme_bw() + theme(legend.position="top")
g2.1 <- g2 + theme_bw() + theme(panel.grid=element_blank()) +
theme(panel.background = element_rect(fill = NA))
plot(double_axis_graph(g1.1,g2.1))
现在我们需要修复:
并在 Hadley's wrath 中幸存下来,因为它做了根本上有缺陷的事情。
关于r - 在ggplot2中构建双y轴图的函数,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/25727596/