r - 可视化 iGraph 和标签对齐
问题描述
编码
library(igraph)
g <- graph.tree(n = 2 ^ 3 - 1, children = 2)
node_labels <- c("", "Group A", "Group B", "(1)Text", "(2)I am a longer text", "(3)I am a long long long text", "(4)X")
lay = layout.reingold.tilford(g)
plot(g,
vertex.size = 4, # node size
vertex.color = '#C4D8E2', # node color
vertex.label = node_labels, # node labels
vertex.label.dist = 5, # node label size
vertex.label.font = 2, # node label type (bold)
vertex.label.degree=0.0,
margin=c(0,0,0,0),
layout=-lay[, 2:1]
)
给了我一个带有标签的图表。如何对齐标签 1 .. 4,它们左对齐,在圆圈旁边而不是中心对齐?从我的角度来看,第 3 项是正确的。切换到 ggraph 将是另一种选择,但在这里旋转标签不起作用。
解决方案
这里是计算代码:
library(igraph)
g <- graph.tree(n = 2 ^ 3 - 1, children = 2)
node_labels <- c("", "Group A", "Group B", "(1)Text", "(2)I am a longer text", "(3)I am a long long long text", "(4)X")
lay = layout.reingold.tilford(g)
t1 <- sapply(as.vector( node_labels), FUN = strwidth,units='in')
t2 <- (t1 - min(t1))/ (max(t1) - min(t1))*3+0.9
plot(g,
vertex.size = 4, # node size
vertex.color = '#C4D8E2', # node color
vertex.label = node_labels, # node labels
vertex.label.dist = t2, # node label size
vertex.label.font = 2, # node label type (bold)
vertex.label.degree=0.0,
margin=c(0,0,0,0),
layout=-lay[, 2:1]
)
这有点好,但我不能完美地做到这一点。