如何在 R(自定义线型)中为图形定义更多线型? [英] How to define more line types for graphs in R (custom linetype)?
问题描述
在 R 中定义了 6 种线型,定义为dashed"、longdash"和longdash".... .>
There are 6 line types defined for plots in R defined as "dashed", "longdash" ... Link
How can I define more types if I have more that 6 series to plot ? The graph lines can be distinguished based on colour in the soft copy but is not suitable for black and white printing.
Are there more options available or do I need to define them based on combining lines and points as in the reference link?
plot(x, type = "b", pch = 0, lty = "dotted")
Some google search suggested that patterns of on/off can also be specified with strings of 2, 4, 6, or 8 characters (non-zero hexadecimal characters, 1–9 and a–f) and the pre-set styles are "dashed" = "44", "dotted" = "13", "dotdash" = "1343", "longdash" = "73", "twodash" = "2262".
But seems it will be a lot of hit and trial to use this to define new line types which will be distinguishable on B&W printing.
Edit :
If points and line styles are combined, how can I define the set of line types in such a way that they can be input as
plot(DF, ..., col = 1:ncol(DF), lty = 1:ncol(DF))
# where DF is the set of data to be plotted.
Thanks a lot.
As you have mentioned in your link, legal values are the strings "blank", "solid", "dashed", "dotted", "dotdash", "longdash", and "twodash". Alternatively, the numbers 0 to 6 can be used (0 for "blank", 1 for "solid", ...).
Moreover, one can also use strings that define the linetype with up to 8 hexadecimal digits (each digit specifying the length of interleaved lines and gaps).
Here an example , using linetype
aes in ggplot2
equivalent to lty
in base R. This way you can get more than the 6 predefined types.
library(ggplot2)
d=data.frame(lt=c("blank", "solid", "dashed", "dotted",
"dotdash", "longdash", "twodash", "1F",
"F1", "4C88C488", "12345678"))
ggplot() +
scale_x_continuous(name="", limits=c(0,1), breaks=NULL) +
scale_y_discrete(name="linetype") +
scale_linetype_identity() +
geom_segment(data=d, mapping=aes(x=0, xend=1, y=lt, yend=lt, linetype=lt))
Explanation:
"1F": dash length 1, gap length F (15)
"F1": dash length F (15), gap length 1
"4C88C488": dash (4), gap (C=12), dash (8), gap (8), dash (C=12), ...
"12345678": dash (1), gap (2), dash (3), gap (4), ...
PS: the solution is adopted from this link.
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