Hi everyone,

It's been a long time since I post last time. For your help, I make some progress in learning R. I meet a new problem when drawing. How to turn the auxiliary line inside a circle into dashed line？At the same time, is it possible to use the function to count the number of points in the circle?

Thank you for your effort and time on this problem in advance.

```
data1<-data.frame(x=c(26.4,28.4,29.7,24.9,25.1,23.6,21.6,30),
y=c(17.1,16.9,17.8,18.5,19.5,19.8,16.8,30),
z=c(17.8,13.5,20.9,20.8,15,10.2,9.3,9.9))
library(ggplot2)
library(ggforce)
circles<-data.frame(
x0=23.6,
y0=19.8,
r=10
)
``` r
p<-ggplot(data = data1)+
geom_point(aes(x=x,y=y,size=z),color="black",shape=1)+
geom_circle(aes(x0=x0,y0=y0,r=r),
data = circles,
color = "red",
alpha=0.05,
linetype="dashed")
p
p1<-p+annotate("segment", x = 13.6, xend = 33.6, y = 19.8, yend = 19.8,size = 1,color='blue')+annotate("segment", x = 23.6, xend = 23.6, y = 9.8, yend = 29.8,size = 1,color='blue')
p1
```

^{Created on 2023-02-09 with reprex v2.0.2}