geom_buffer_cn: Plot Buffered Layers for China's Boundary

In ggmapcn: Customizable China Map Visualizations

Plot Buffered Layers for China's Boundary

Description

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 (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

# Plot buffers with specified distances for mainland and ten-segment line
ggplot() +
  geom_buffer_cn(
    mainland_dist = 10000,
    ten_line_dist = 5000
  ) +
  theme_minimal()

ggmapcn documentation built on April 12, 2025, 2:09 a.m.