如何在R中的visNetwork包中指定節點的位置

Question

我想將節點的位置固定在（1,0），（0,1），（ - 1,0），（0，-1）和（0,0）。 但是，它不起作用，我的Java知識是零（似乎， 這里是Java代碼的問題）。

有人可以幫忙嗎？ 這是一個例子：

require(visNetwork, quietly = TRUE)
nodes <- data.frame(id = 1:5)
                    # x = c(1, 0, -1, 0, 0), 
                    # y = c(0, 1, 0, -1, 0))
edges <- data.frame(from = c(1,2), to = c(1,3))

visNetwork(nodes, edges, width = "100%") %>%
  visNodes(x = c(1, 0, -1, 0, 0), 
           y = c(0, 1, 0, -1, 0), fixed = TRUE, physics = TRUE) %>%
  visOptions(highlightNearest = TRUE) %>%
  visInteraction(navigationButtons = TRUE, dragNodes = FALSE, 
                 dragView = FALSE, zoomView = FALSE) %>%
  visEdges(arrows = 'from')

Answer 1

你可以做到

coords <- matrix(ncol=2, byrow=T, data=c(
  1,0,
  0,1,
  -1,0,
  0,-1,
  0,0))
opts <- . %>% visOptions(highlightNearest = TRUE) %>%
  visInteraction(navigationButtons = TRUE, dragNodes = FALSE, 
                 dragView = FALSE, zoomView = FALSE) %>%
  visEdges(arrows = 'from') 

visNetwork(nodes, edges, width = "100%") %>%
  visIgraphLayout(layout = "layout.norm", layoutMatrix = coords) %>% 
  opts

要么

nodes$x <- c(1, 0, -1, 0, 0)*100
nodes$y <- c(0, 1, 0, -1, 0)*100
visNetwork(nodes, edges, width = "100%") %>% 
  visNodes(fixed = TRUE) %>% 
  opts

如有必要coords[,2] <- coords[,2]*-1使用coords[,2] <- coords[,2]*-1翻轉垂直軸。