This function creates a ggplot2 layer for displaying buffered areas around China's boundaries, including both the mainland boundary and the ten-segment line. Buffers with user-defined distances are generated around each boundary, providing flexibility in projection and appearance.
Usage
geom_buffer_cn(
mainland_dist = 20000,
ten_line_dist = NULL,
crs = "+proj=aeqd +lat_0=35 +lon_0=105 +ellps=WGS84 +units=m +no_defs",
color = NA,
fill = "#D2D5EB",
...
)Arguments
- mainland_dist
Numeric. The buffer distance (in meters) for the mainland boundary.
- ten_line_dist
Numeric. The buffer distance (in meters) for each segment of the ten-segment line. If not specified, it defaults to the same value as
mainland_dist.- crs
Character. The coordinate reference system (CRS) for the projection. Defaults to "+proj=aeqd +lat_0=35 +lon_0=105 +ellps=WGS84 +units=m +no_defs". Users can specify other CRS strings to customize the projection (e.g., "+proj=merc" for Mercator).
- color
Character. The border color for the buffer area. Default is
NA(transparent).- fill
Character. The fill color for the buffer area. Default is
"#D2D5EB".- ...
Additional parameters passed to
geom_sf.
Value
A ggplot2 layer displaying buffered areas around China's boundaries, with customizable buffer distances for the mainland boundary and the ten-segment line, using the specified projection.
Examples
if (FALSE) { # \dontrun{
# Plot buffers with specified distances for mainland and ten-segment line
ggplot() +
geom_buffer_cn(
mainland_dist = 10000,
ten_line_dist = 5000
) +
theme_minimal()
} # }