ggraph 指定节点的填充和颜色

Question

我已经看到如何从美学中获取节点填充并将颜色设置为在节点周围有黑色边距。但是，如果我尝试指定固定颜色和填充，我只会得到黑色节点。

ggraph(igraph::graph_from_adjacency_matrix(matrix(sample(0:1, 100, replace=TRUE, 
                                                         prob=c(0.8,0.2)), nrow=10), 
                                           mode='undirected', diag=F)) + 
  geom_edge_link(colour = "grey") + 
  geom_node_point(fill = "red", 
                  colour = "black", 
                  size = 10) + 
  theme(legend.position = 'none') +
  theme_graph(background = "white")

在这种情况下如何指定颜色？

Answer 1

默认情况下，它采用实心形状（形状 = 19），其中 'fill' 将毫无意义。指定形状和调整笔触会有所帮助。

ggraph(igraph::graph_from_adjacency_matrix(matrix(sample(0:1, 100, replace=TRUE, 
                                                         prob=c(0.8,0.2)), nrow=10), 
                                           mode='undirected', diag=F)) + 
  geom_edge_link(colour = "grey") + 
  geom_node_point(fill = "red", 
                  colour = "black", 
                  size =10,
                  shape = 21, # Change the shape
                  stroke = 2) + # Specify the width of margin
  theme(legend.position = 'none') +
  theme_graph(background = "white")

ggraph 指定节点的填充和颜色

ggraph specify both fill and colour of nodes

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ggraph