我试图绘制一些高程数据(通常在-90度至90度之间),并且我已经使用了coord_polar
在某种程度上成功。看一下这段代码:
library(ggplot2)
#
r = c(2:8)*20
e = c(-4:9)*10
a = c(0:71)*5
points = expand.grid(r,e,a)
colnames(points) = c("distance", "elevation", "azimuth")
points$elevation[points$elevation <0] = points$elevation + 360
forEle = subset(points, azimuth == 0)
#ele_range =
ggplot(forEle, aes( x=elevation, y=distance))+
geom_point()+
coord_polar(theta = "x", start = -1.5708, direction = -1)+
scale_y_continuous(breaks = c(0:16)*10, limits=c(0, 160)) +
scale_x_continuous(breaks=seq(0, 359, by=30), labels=c(expression(0^degree), expression(30^degree), expression(60^degree), expression(90^degree), expression(60^degree), expression(30^degree), expression(0^degree), expression(-30^degree), expression(-60^degree), expression(-90^degree), expression(-60^degree), expression(-30^degree)), limits=c(0, 360)) +
labs(title = "",
x = "x",
y = "y")+
theme(legend.position="bottom")
我的第一个难点是尝试将负角度映射到图表上(我通过将360度添加到所有负值来实现),但我想知道是否有更好的方法。其次,更重要的是,我想将输出从-90度到90度进行剪裁(或限制),即图表的右侧,但我一直无法做到。非常感谢任何关于这个问题的帮助。
xlim()
函数吗? - metasequoia