如何以适当的宽高比保存ggplot2图形? [英] How to save a ggplot2 graphic with the proper aspect ratio?
问题描述
我的问题是关于如何保存ggplot2
图
长宽比.如果我制作一个简单的图形并设置图的尺寸
使用ggsave()
,绘图将占据已保存文件的整个区域.
My question is about how to save a ggplot2
graph in respect with the
aspect ratio. If I make a simple graphic and set the dimension of the plot
with ggsave()
, the plot will occupy the entire area of the saved file.
library(ggplot2)
library(sf)
#> Linking to GEOS 3.7.1, GDAL 2.4.2, PROJ 5.2.0
#> WARNING: different compile-time and runtime versions for GEOS found:
#> Linked against: 3.7.1-CAPI-1.11.1 27a5e771 compiled against: 3.7.0-CAPI-1.11.0
#> It is probably a good idea to reinstall sf, and maybe rgeos and rgdal too
df <- data.frame(
longitude = -47,
latitude = 45
)
p <- ggplot(df, aes(x = longitude, y = latitude)) +
geom_point() +
theme(
plot.background = element_rect(fill = "black")
)
tf <- tempfile(fileext = ".png")
ggsave(tf, p, width = 4, height = 4)
p
在下面的示例中,我将数据转换为sf
对象并绘制
使用geom_sf()
可以使绘图具有一定的宽高比
匹配所选的投影.
In the following example, I transform the data into an sf
object and plot
it using geom_sf()
This cause the plot to have a certain aspect ratio to
match the chosen projection.
df <- st_as_sf(df, coords = c("longitude", "latitude"), crs = 4326)
p <- ggplot(df) +
geom_sf() +
theme(
plot.background = element_rect(fill = "black")
)
tf <- tempfile(fileext = ".png")
但是,将尺寸设置为4 x 4会导致填充物(白色边框)出现在 情节的一面.因此,当 图形被粘贴到PowerPoint演示文稿中(例如).
However, setting the dimensions to 4 x 4 will cause paddings (white borders) to appear on the side of the plot. Hence, these white borders will be present when the graph is pasted into a PowerPoint presentation (for example).
ggsave(tf, p, width = 4, height = 4)
p
您可以打开tf
并在黑色区域周围看到白色填充.
我的问题是,如何找到绘图的正确长宽比,以便为ggsave()
提供适当的尺寸.
You can open tf
and see the white padding around the black area.
My question is about, how can I find the correct aspect ratio of the plot so I can provide appropriate dimensions to ggsave()
.
# Which dimensions to use to respect the aspect ratio of the map?
# ggsave(tf, p, width = xxx, height = yyy)
由 reprex软件包(v0.3.0)于2019-11-28创建 sup>
Created on 2019-11-28 by the reprex package (v0.3.0)
推荐答案
这是我的解决方案,用于删除ggplot2图形周围的边框: https://www.pmassicotte.com/post/removing-borders-around-ggplot2-graphs/
Here is my solution to remove borders around ggplot2 graphs: https://www.pmassicotte.com/post/removing-borders-around-ggplot2-graphs/
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