旋转ggplot切片热图的上三角 [英] Rotate upper triangle of a ggplot tile heatmap

问题描述

我已经绘制了这样的热图:

I've plotted a heat-map like this:

ggplot(test, aes(start1, start2)) +
  geom_tile(aes(fill = logFC), colour = "gray", size=0.05) +
  scale_fill_gradientn(colours=c("#0000FF","white","#FF0000"), na.value="#DAD7D3")

这将绘制热图的上部三角形.我想绘制的是一个完全相同的三角形，但斜边为x-axis.

This plots the upper triangle of a heatmap. What i'd like to plot is the very same triangle, but having the hypotenuse as the x-axis.

我该怎么做?

修改:添加了可复制的示例

Added reproducible example

library(ggplot2)

# dummy data
df1 <- mtcars[, c("gear","carb", "mpg")]

# normal tile plot
gg1 <- ggplot(df1, aes(gear, carb, fill = mpg)) +
  geom_tile() +
  xlim(c(1, 10)) +
  ylim(c(1, 10)) +
  theme_void() +
  theme(legend.position = "none")

预期的输出(手动旋转):

Expected output (rotated manually):

使用基本图image()的相关帖子: 可视化和旋转矩阵

Related post using base plot image(): Visualising and rotating a matrix

可能的解决方案示例代码在 LDheatmap包中，使用grid.

Possible solution example code is in LDheatmap package using grid.

推荐答案

使用此解决方案将输出裁剪到底部，因此解决方法是添加额外的绘图边距，然后使用grid::viewport()进行旋转:

Using this solution gets the output clipped at the bottom, so workaround would be to add extra plot margins then use grid::viewport() to rotate:

library(ggplot2) #ggplot2_2.2.1
library(grid)

gg1 <- ggplot(df1, aes(gear, carb, fill = mpg)) +
  geom_tile() +
  xlim(c(1, 10)) +
  ylim(c(1, 10)) +
  theme_void() +
  # add extra margins
  theme(legend.position = "none",
        plot.margin = unit(c(1, 1, 1, 1), "cm")) 

# then rotate
print(gg1, vp = viewport(angle = 45))

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