如何在 R 中的矢量图上绘制 igraph 对象

Question

我使用 igraph 和 sf 包。

我有一个 igraph 对象，其顶点具有空间坐标 geo_dist_graph。顶点名称和坐标如下所示：

grid_grid <- 
structure(list(coords.x1 = c(15.504078, 15.704078, 15.904078, 
15.104078, 15.304078, 15.504078, 15.704078, 15.104078, 15.304078, 
15.704078, 14.904078, 14.304078, 13.904078, 14.704078, 13.704078, 
14.104078, 14.704078, 14.904078, 13.704078, 13.904078, 14.704078, 
13.704078, 13.904078, 14.304078), 
coords.x2 = c(43.835623, 43.835623, 
43.835623, 44.035623, 44.035623, 44.035623, 44.035623, 44.235623, 
44.235623, 44.235623, 44.435623, 44.635623, 44.835623, 44.835623, 
45.035623, 45.035623, 45.035623, 45.035623, 45.235623, 45.235623, 
45.235623, 45.435623, 45.435623, 45.435623), 
g9.nodes = c(27, 
28, 29, 40, 41, 42, 43, 55, 56, 58, 69, 81, 94, 98, 108, 110, 
113, 114, 123, 124, 128, 138, 139, 141)), 
class = "data.frame", row.names = c("1", 
"2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", 
"14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"
))

该图来自一个简单的平方邻接矩阵：

geo_dist_graph <- 
  structure(c(NA, 1, 1, NA, NA, 1, 1, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, 1, NA, NA, NA, 
1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, 1, 1, NA, NA, NA, NA, 1, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, 
NA, 1, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, 1, NA, 1, NA, NA, 1, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, NA, 1, NA, 
1, NA, 1, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, 1, 1, 1, NA, NA, 1, NA, NA, NA, 1, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, NA, 
NA, 1, NA, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, 1, 1, 1, NA, 1, NA, 1, 1, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, 1, NA, 
1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, 1, 1, NA, NA, NA, NA, 1, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, 1, 1, NA, 1, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, 1, 1, 
NA, NA, NA, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, 1, 1, NA, NA, NA, NA, 1, 1, NA, NA, 1, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, 1, NA, 
NA, 1, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, 1, 1, NA, 1, NA, NA, NA, NA, 1, NA, NA, NA, 1, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, NA, 1, 
NA, NA, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, 1, NA, NA, 1, NA, NA, NA, 1, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, NA, 
NA, 1, NA, 1, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, 1, NA, 1, 1, NA, NA, 1, NA, NA, 1, 1, 1, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA, NA, 1, 1, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, 1, 1, NA, NA, 1, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, 
1, NA, 1, NA, 1, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, 1, NA, NA, NA, 1, NA, NA, 1, NA), 
.Dim = c(24L, 
24L))

colnames(geo_dist_graph) <- grid_grid$g9.nodes
row.names(geo_dist_graph) <- grid_grid$g9.nodes

geo_dist_graph <- graph_from_adjacency_matrix(geo_dist_graph, mode = "upper", diag = F)

这样连接的空间坐标：

V(geo_dist_graph)$x <- 
  grid_grid$coords.x1[match(V(geo_dist_graph)$name, grid_grid$g9.nodes)]

V(geo_dist_graph)$y <- 
  grid_grid$coords.x2[match(V(geo_dist_graph)$name, grid_grid$g9.nodes)]

当使用 plot 函数时，该图在 space 中正确绘制。但是当我尝试添加像这样的底图时 plot(map_crop_sp, add = T)，地图并没有显示在图形后面，但也没有错误消息。

地图是矢量图，不知道重要不重要。这是用于创建它的代码。

map <- st_read("ne_10m_coastline/ne_10m_coastline.shp")
map_crop <- st_crop(map, xmin = 13.304078, ymin = 43.635623, xmax = 16.503846, ymax = 45.60185)
map_crop_sp <- as(map_crop, Class = "Spatial")

Answer 1

回答

由于 igraph 应该在地图的顶部，所以我将其绘制在第二位。我还添加了 rescale = F:

plot(map_crop_sp)
plot(geo_dist_graph, add = T, rescale = F)

理由

我输入了 ?plot.igraph。从那里，我找到了 ?igraph.plotting。似乎绘制一个 igraph 对象会重新缩放它（plot(..., rescale = TRUE):

Logical constant, whether to rescale the coordinates to the [-1,1]x-1,1 interval. This parameter is not implemented for tkplot.

Defaults to TRUE, the layout will be rescaled.

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