Question

如何在R googleVis sankey图表中更改节点和链接颜色？并且链接与其始发节点具有相同的颜色？

library(googleVis)
datSK <- data.frame(From=c(rep("A",3), rep("B", 3)),
                To=c(rep(c("X", "Y", "Z"),2)),
                Weight=c(5,7,6,2,9,4))

Sankey <- gvisSankey(datSK, from="From", to="To", weight="Weight",
                 options=list(
                   sankey="{link: {color: { fill: '#d799ae' } },
                        node: { color: { fill: '#a61d4c' },
                        label: { color: '#871b47' } }}"))
plot(Sankey)

Answer 1

只要您必须为来自2个始发节点的链接着色，您就需要2种颜色的链接。你总共有5个节点，所以你需要5种颜色。

让我们用JSON格式创建2个数组，其中包含节点和链接的颜色

colors_link <- c('green', 'blue')
colors_link_array <- paste0("[", paste0("'", colors_link,"'", collapse = ','), "]")

colors_node <- c('yellow', 'lightblue', 'red', 'black', 'brown')
colors_node_array <- paste0("[", paste0("'", colors_node,"'", collapse = ','), "]")

接下来，将该数组插入选项：

opts <- paste0("{
        link: { colorMode: 'source',
                colors: ", colors_link_array ," },
        node: { colors: ", colors_node_array ," }
      }" )

最后，情节图：

plot( gvisSankey(datSK, from="From", to="To", weight="Weight",
                     options=list(
                       sankey=opts)))

请注意，在选项中，colorMode设置为“source”，这意味着您希望为来自原始节点的链接着色。或者，将“target”设置为指定节点的颜色链接

编辑：添加多级桑克的说明

找到如何为多级sankeys分配颜色有点棘手。

我们需要创建其他日期框架：

datSK <- data.frame(From=c(rep("A",3), rep("B", 3), rep(c("X", "Y", "Z"), 2 )),
                To=c(rep(c("X", "Y", "Z"),2), rep("M", 3), rep("N", 3)),
                Weight=c(5,7,6,2,9,4,3,4,5,6, 4,8))

这里我们只需要改变颜色数组。建立情节的命令是一样的让我们假设我们想要节点和链接的这些颜色：

colors_link <- c('green', 'blue', 'yellow', 'brown', 'red')
colors_link_array <- paste0("[", paste0("'", colors_link,"'", collapse = ','), "]")

colors_node <- c('yellow', 'lightblue', 'red', 'black', 'brown', 'green', 'brown')
colors_node_array <- paste0("[", paste0("'", colors_node,"'", collapse = ','), "]")

结果将是：

最棘手的部分是了解如何分配这些颜色：

链接按照它们在数据集（row_wise）中的显示顺序分配

对于节点颜色是在订单图中指定的。
- 从A到X，Y，Z - 绿色
- 从X到M，N - 蓝色
- 从Y到M，N - 黄色
- 从Z到M，N - 棕色
- 从B到X，Y，Z - 红

有关如何格式化sankey图表的更多详细信息：https://developers.google.com/chart/interactive/docs/gallery/sankey

Answer 2

我知道这比较老，但万一其他人陷入困境，我想出了如何进行正确排序并生成一串颜色节点的方法，以便可以为某些标签使用自定义颜色。向@ vadym-b喊出数据并解释顺序。检查一下：

#convert to list combined of source and target for color order
# edges is a dataframe from @vadym-b's answer above
edges <- data.frame(From=c(rep("A",3), rep("B", 3), rep(c("X", "Y", "Z"), 2 )),
                    To=c(rep(c("X", "Y", "Z"),2), rep("M", 3), rep("N", 3)),
                    Weight=c(5,7,6,2,9,4,3,4,5,6, 4,8))

#we have to make the order right - you need a list
# that is a combination of From, To, From, To, From, To
nc.df <- c()
for (i in 1:nrow(edges)) {
  nc.df <- c(nc.df, as.character(edges$From[i]), as.character(edges$To[i]))
}

#the actualy parsing - get the unique list and return
# colors based on what the source or target value is
nodeColor <- sapply(unique(nc.df), function(r) {
  if (grepl('A',r)) return('red')
  if (grepl('B',r)) return('red')
  if (grepl('Z',r)) return('green')
  if (grepl('X',r)) return('green')
  if (grepl('Y',r)) return('purple')
  if (grepl('M',r)) return('blue')
  if (grepl('N',r)) return('blue')
  #return a default color if you like
  return('black')
})

#make a sankey
library(googleVis)

# put the color list in a collapsed string
sankey <- gvisSankey(
  edges, 
  chartid = 'Sankey', 
  from="From", 
  to="To", 
  weight="Weight", 
  options=list(
    sankey = paste0("{
      iterations: 0,
      link: {
        colorMode: 'gradient'
      },
      node: {
        colors: ['",paste(nodeColor,collapse="','"),"']
      }
    }")
  )
)

plot(sankey)

Answer 3

我已经在github上添加了一段代码。

#TOPLOTS[,1] = from ; TOPLOTS[,1] = to
names_pahtwayorder<-unlist(data.frame(t(TOPLOTs[,1:2])))
names_pahtwayorder<-names_pahtwayorder[!duplicated(names_pahtwayorder)]
names(names_pahtwayorder)<-NULL; names_pahtwayorder

https://github.com/SkanderMulder/ExtractIPA/blob/master/functionSankey.r

如何在R googleVis sankey图表中更改节点和链接颜色

3 个答案: