How to render igraph in R - r

Question

There is dataset with code below. And I need get a graph like in the picture, without changing frame. I tried use rbind to add more hierarchy to data frame in favor to get diagram like in picture. col0 and col1 data is changing debending on data while col2 remains always the same.
df <- data.frame(col0 = c("Cat Dog Wolf", "Cat Dog Wolf", "Cat Dog Wolf"),
col1 = c( "Cat", "Dog", "Wolf"),
col2 = c( "Feline", "Canis", "Canis2"))
df <-rbind(df, data.frame(col0="Cat Dog Wolf", col1 = "Canis2", col2 = "Canis"))
df <-df[c('col1', 'col2')]
names(df) <-c('from', 'to')
abc <-union(df$to, df$from)
g <-graph.data.frame(df, directed = TRUE, vertices = abc)
plot(g, vertex.size = 20, vertex.label.dist = 0.5, vertex.color = "blue",
edge.arrow.size = 0.5, layout = layout.reingold.tilford(g))

Answer 1

You need three edges taken from only two columns ("From" and "To"). But you have three columns in df so you have to choose from them. I created a new column with the names from col1 and col2 pasted together. Then, I chose the first two vertex from the top and rbind the third one.
df <- data.frame(col0 = "Cat Dog Wolf",
col1 = c( "Cat", "Dog", "Wolf"),
col2 = c( "Feline", "Canis", "Canis2"))
df$col1_2 <- paste(df$col2,df$col1)
df <- rbind(df[1:2,c(1,4)],data.frame(col0=df[2,4],col1_2=df[3,4]))
names(df) <-c('from', 'to')
abc <-union(df$to, df$from)
g <-graph.data.frame(df, directed = TRUE, vertices = abc)
plot(g, vertex.size = 20, vertex.label.dist = 0.5, vertex.color = c("lightblue","red","green","white"),
edge.arrow.size = 0.5, layout = layout.reingold.tilford(g))