如何在ggplot2中将线宽设置为0.5 pt? [英] How to set the line width to 0.5 pt in ggplot2?
问题描述
在ggplot2中,使用 element_text
和参数 size = 6
可以很容易地将字体大小设置为6 pt(对于文本,大小的单位是pt)。但是,我们不能使用带参数 size = 0.5
的 element_line
来设置线宽为0.5 pt(对于line,size没有单位)。那么如何解决这个问题呢?
在 grid
包中,我遇到了类似的问题。代码如下:
library(grid)
grid.rect(width = unit(5,cm ),height = unit(5,cm),gp = gpar(lwd = unit(2,cm)))
,结果是:
显然,线宽与长方形的宽度或高度相比,不是2厘米。
一个lwd单位显然是1/96英寸对于pdf设备,它在行的两边对称扩展
grid.newpage()
网格。 rect(width = unit(1,cm)+ unit(1,mm),
height = unit(1,cm)+ unit(1,mm),
gp = gpar(lwd = 96 / 2.54,alpha = 0.5,linejoin =miter,linejoin = 1))
然而,在Windows系统中,结果是:
In ggplot2, it is easy to use element_text
with argument size=6
to set the font size to 6 pt (For text, size has a unit of pt). However, we cannot use element_line
with argument size=0.5
to set the line width to 0.5 pt (For line, size has no unit). So how to solve this problem?
In grid
package, I meet with the similar question. The code is as following:
library(grid)
grid.rect(width=unit(5, "cm"), height=unit(5, "cm"), gp=gpar(lwd=unit(2, "cm")))
and the result is:
Obviously, the line width is not 2 cm comparing with the width or height of the rectangle.
a lwd unit is obviously 1/96 of an inch for the pdf device, and it extends symmetrically on either side of the line
grid.newpage()
grid.rect(width=unit(1, "cm")+unit(1,"mm"),
height=unit(1, "cm")+unit(1,"mm"),
gp=gpar(lwd=96/2.54, alpha=0.5, linejoin="mitre",linejoin=1))
However, in windows system, the result is:
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