ggplot2中轴触摸的像素丢失 [英] Missing pixel where the axes touch in ggplot2

问题描述

我注意到ggplot2在x轴和y轴之间留了一个小间隙。
考虑以下代码：

I've noticed that ggplot2 leaves a small gap between the x and the y axes. Consider the following code:

require(ggplot2, quietly=TRUE)

axisLines = element_line(color="black", size = 2)

p= ggplot(BOD, aes(x=Time, y=demand)) + geom_line() +
  theme(axis.line.x = axisLines,
        axis.line.y = axisLines,
        panel.background = element_blank())
p

结果显示图形中难看的缺失角（带有红色圆圈）。

The result shows the ugly "missing corner" in graphs (emphasized with a red circle).

我还没有看到没有这样做的ggplot示例发生（但是，有很多例子可以做到这一点，例如 https://rpubs.com/Koundy/71792）。

I have not seen a ggplot example where this doesn't happen (however, lots of examples where it does, e.g https://rpubs.com/Koundy/71792).

我尝试在轴上添加geom_vline或geom_hline，但是由于它们在图形区域之外，因此它们无法填补空白。

I tried adding a geom_vline or geom_hline over the axes, but they don't fill the gap, since it's outside of the graph area.

如果有人能解决这个问题，我将非常感谢手动添加点或稍微移动轴。

I would be greatly thankful if anybody had a solution to this, e.g. manually adding the dot or shifting the axes slightly.

推荐答案

尝试更改换行符。 lineend = square 似乎有效

axisLines = element_line(color="black", size = 2, lineend = "square")
p= ggplot(BOD, aes(x=Time, y=demand)) + geom_line() +
  theme(axis.line.x = axisLines,
        axis.line.y = axisLines,
        panel.background = element_blank())
p

请参见 http：//docs.ggplot2。 org / 0.9.3.1 / geom_path.html 有关 lineend

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