ggplot2图例到底部和水平 [英] ggplot2 legend to bottom and horizontal

问题描述

如何将ggplot2图例移动到图的底部并水平旋转?

How can I move a ggplot2 legend to the bottom of the plot and turn it horizontally?

示例代码:

library(reshape2) # for melt
df <- melt(outer(1:4, 1:4), varnames = c("X1", "X2"))
p1 <- ggplot(df, aes(X1, X2)) + geom_tile(aes(fill = value))
p1 + scale_fill_continuous(guide = guide_legend())

所需(近似)结果:

推荐答案

如果要移动图例的位置，请使用以下代码:

If you want to move the position of the legend please use the following code:

library(reshape2) # for melt
df <- melt(outer(1:4, 1:4), varnames = c("X1", "X2"))
p1 <- ggplot(df, aes(X1, X2)) + geom_tile(aes(fill = value))
p1 + scale_fill_continuous(guide = guide_legend()) +
    theme(legend.position="bottom")

这应该给您想要的结果.

This should give you the desired result.

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