ggplot2，拼凑 - 轴标题的一部分被相邻图的边缘遮挡

Question

我有两个折线图，使用 'patchwork' 一个叠在另一个下面。我想要堆栈的通用 y-axis 标题，所以我在两行 charts.After 堆栈的上部添加了 Y-axis 标签我发现，y-axis 标签的下部是被下方折线图的边缘遮挡（如下图绿色和黄色绘图背景所示）。这是代码和结果

# data
x<- 1:256
x
y<- runif(256, 0, 10)
y

data <- data.frame(x,y)
head(data)

# lc1
# Geom properties
lc1<- ggplot(data, aes(x=x, y=y)) + 
  geom_line()

# Scale
lc1<- lc1 +
  expand_limits(x = 0, y = 0) +
  scale_x_continuous(
    expand = c(0, 0),
    breaks = c(0, 32, 64, 96, 128, 160, 192, 224, 256),
    label = NULL
  ) +
  scale_y_continuous(expand = c(0, 0),
                     breaks = c(0, 5, 10))

# Aspect ratio
lc1 <- lc1 + theme(aspect.ratio = 0.15)

# Panel properties
lc1 <- lc1 +
  theme(panel.background = element_blank()) +
  theme(
    panel.grid.minor = element_blank(),
    panel.grid.major = element_blank(),
    legend.position = "none"
  )

# Axes lines, ticks, axis text
lc1 <- lc1 +
  theme(
    axis.line.x = element_line (colour = "grey", size = 0.5),
    axis.line.y = element_line(colour = "black", size = 0.5),
    axis.ticks.x = element_blank(),
    axis.ticks.y = element_line(colour = "black", size = 0.5),
    axis.ticks.length = unit(.15, "cm")
  ) +
  theme(
    axis.text.y = element_text(
      color = "black",
      face = "plain",
      size = 6,
      margin = margin(
        t = 0,
        r = 2,
        b = 0,
        l = 0
      ),
      angle = 0,
      vjust = 0,
      hjust = 0
    )
  )

# Title, caption, axes labels 
lc1<- lc1 + 
  ylab(label = "Y-axis label (unit)") +
  theme(axis.title.x = element_text(
    color = "black",
    size = 10,
    face = "bold",
    hjust = 0
  ))

# Plot margins
lc1 <- lc1 +
  theme(plot.margin = unit(c(-0.55,0,-0.53,0), "cm"))

# plot background
lc1<- lc1 + theme(plot.background = element_rect(fill = "green"))

lc1




# lc2
# Geom properties
lc2<- ggplot(data, aes(x=x, y=y)) + 
  geom_line()

# Scale
lc2<- lc2 +
  expand_limits(x = 0, y = 0) +
  scale_x_continuous(
    expand = c(0, 0),
    breaks = c(0, 32, 64, 96, 128, 160, 192, 224, 256),
    label = NULL
  ) +
  scale_y_continuous(expand = c(0, 0),
                     breaks = c(0, 5, 10))

# Aspect ratio
lc2 <- lc2 + theme(aspect.ratio = 0.15)

# Panel properties
lc2 <- lc2 +
  theme(panel.background = element_blank()) +
  theme(
    panel.grid.minor = element_blank(),
    panel.grid.major = element_blank(),
    legend.position = "none"
  )

# Axes lines, ticks, axis text
lc2 <- lc2 +
  theme(
    axis.line.x = element_line (colour = "grey", size = 0.5),
    axis.line.y = element_line(colour = "black", size = 0.5),
    axis.ticks.x = element_blank(),
    axis.ticks.y = element_line(colour = "black", size = 0.5),
    axis.ticks.length = unit(.15, "cm")
  ) +
  theme(
    axis.text.y = element_text(
      color = "black",
      face = "plain",
      size = 6,
      margin = margin(
        t = 0,
        r = 2,
        b = 0,
        l = 0
      ),
      angle = 0,
      vjust = 0,
      hjust = 0
    )
  )

# Title, caption, axes labels 
lc2<- lc2 + 
  ylab(label = "") +
  theme(axis.title.x = element_text(
    color = "black",
    size = 10,
    face = "bold",
    hjust = 0.5
  ))

# Plot margins
lc2 <- lc2 +
  theme(plot.margin = unit(c(-0.55,0,-0.53,0), "cm"))

# plot background
lc2<- lc2 + theme(plot.background = element_rect(fill = "yellow"))

lc2

# stacking
library(patchwork)

p<- (lc1/lc2)
p

所以我尝试通过将下图表的左边距从 0 减少到 -1 来解决问题，但它并没有改变边距，轴标题仍然被阻止。如果两个图表的左边距都减少到 -1，y-axis 标题，刻度将不再可见，如下图所示。绿色和黄色填充的矩形是绘图背景。

有谁能帮忙看看解决办法吗？任何想法，我还能尝试什么？谢谢！

Answer 1

您可以简单地为组合图设置标题（而不是 lc1 或 lc2）。您需要为 lc1 和 lc2 设置空白 y-labels，就像您已经为 lc2 所做的那样（例如 ylab(label = "")。

p <- (lc1/lc2) + ylab(label = "Y-axis label (unit)")

ggplot2，拼凑 - 轴标题的一部分被相邻图的边缘遮挡

ggplot2, patchwork - part of axis title blocked by margin of neighbouring plot

plot

axis

r

ggplot2

patchwork