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我在networkD3包中创建了一个 sankey 图。我想修改节点和链接的颜色和透明度。

我的数据networkD3_data附在最后。

问题一：如何使用自定义调色板修改节点颜色？

我不确定如何使用用户定义的调色板修改颜色。我有必要使用特定于每个节点源的相同调色板来与我拥有的其他图保持一致。

目前，我可以通过定义NodeGroup. 下面的图接近我想要的，但是现在我想自己指定每个源节点的颜色。 

library(networkD3)
sankeyNetwork(Links = networkD3_data$links, Nodes = networkD3_data$nodes, Source = "source", Target = "target", Value = "value", NodeID = "name", NodeGroup="group", fontSize=14)

在此处输入图像描述

?sankeyNetwork说有一个colourScale参数，它采用“字符串指定节点的分类色标”。我认为这意味着我可以将具有所需颜色的列添加到networkD3_data$nodes数据框中并colourScale这样调用：

sankeyNetwork(Links = networkD3_data$links, Nodes = networkD3_data$nodes, Source = "source", Target = "target", Value = "value", NodeID = "name", NodeGroup="group", fontSize=14, colourScale="colors")

但这不起作用，没有情节产生。我搜索了stackoverflow并找到了2014年的答案：here，但我认为这不再有效，因为我在Error: unexpected symbol调用这些提议的解决方案中的任何一个时遇到错误（或者我可能只是不知道如何正确实现它）。

d3.scale.ordinal().range(["#7d3945","#e0677b", "#244457"])
d3.scaleOrdinal().range(["#7d3945","#e0677b", "#244457"])

问题2：是否可以定义源和目标的显示顺序？

那么源从 Source0 到 Source10 并且从 Target11 到 Target47 列出目标？这套在哪里？我知道这对于允许算法以最佳方式定位节点是违反直觉的。

问题 3：如何使用自定义调色板修改链接颜色并更改透明度/不透明度？

我还想使用与源相同的配色方案对从源发出的链接进行颜色编码。我可以通过定义来做到这一点LinkGroup，见下图。我再次接近我想要的，但我只需要指定自己使用的颜色，我不确定在哪里修改它。我还想调整不透明度，使源颜色比链接颜色更纯色。

sankeyNetwork(Links = networkD3_data$links, Nodes = networkD3_data$nodes, Source = "source", Target = "target", Value = "value", NodeID = "name", NodeGroup="group", LinkGroup="group", fontSize=14)

在此处输入图像描述

这是我的数据——dput(networkD3_data)

structure(list(nodes = structure(list(name = c("Source0", "Source1", 
"Source2", "Source3", "Source4", "Source5", "Source6", "Source7", 
"Source8", "Source9", "Source10", "Target11", "Target12", "Target13", 
"Target14", "Target15", "Target16", "Target17", "Target18", "Target19", 
"Target20", "Target21", "Target22", "Target23", "Target24", "Target25", 
"Target26", "Target27", "Target28", "Target29", "Target30", "Target31", 
"Target32", "Target33", "Target34", "Target35", "Target36", "Target37", 
"Target38", "Target39", "Target40", "Target41", "Target42", "Target43", 
"Target44", "Target45", "Target46", "Target47"), group = c("Source0", 
"Source1", "Source2", "Source3", "Source4", "Source5", "Source6", 
"Source7", "Source8", "Source9", "Source10", "Target", "Target", 
"Target", "Target", "Target", "Target", "Target", "Target", "Target", 
"Target", "Target", "Target", "Target", "Target", "Target", "Target", 
"Target", "Target", "Target", "Target", "Target", "Target", "Target", 
"Target", "Target", "Target", "Target", "Target", "Target", "Target", 
"Target", "Target", "Target", "Target", "Target", "Target", "Target"
), colors = c("#9E0142", "#D53E4F", "#F46D43", "#FDAE61", "#FEE08B", 
"#FFFFBF", "#E6F598", "#ABDDA4", "#66C2A5", "#3288BD", "#5E4FA2", 
"#969696", "#969696", "#969696", "#969696", "#969696", "#969696", 
"#969696", "#969696", "#969696", "#969696", "#969696", "#969696", 
"#969696", "#969696", "#969696", "#969696", "#969696", "#969696", 
"#969696", "#969696", "#969696", "#969696", "#969696", "#969696", 
"#969696", "#969696", "#969696", "#969696", "#969696", "#969696", 
"#969696", "#969696", "#969696", "#969696", "#969696", "#969696", 
"#969696")), .Names = c("name", "group", "colors"), row.names = c(NA, 
-48L), class = "data.frame"), links = structure(list(source = c(0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 
3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 
6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 
8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10
), target = c(11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 
23, 13, 18, 15, 11, 12, 24, 21, 25, 26, 27, 19, 28, 16, 22, 29, 
30, 31, 32, 18, 16, 15, 13, 27, 29, 19, 33, 34, 31, 35, 21, 24, 
11, 30, 36, 28, 37, 38, 39, 40, 26, 41, 11, 12, 15, 18, 19, 14, 
13, 16, 27, 34, 20, 22, 25, 12, 27, 16, 18, 13, 11, 12, 11, 14, 
27, 21, 16, 18, 22, 13, 15, 19, 16, 11, 12, 39, 12, 14, 18, 11, 
42, 43, 44, 13, 11, 18, 15, 12, 19, 45, 31, 16, 20, 46, 40, 47, 
11, 12, 18, 16, 14, 19, 15, 11, 12, 16, 13, 18, 14, 34, 31, 15
), value = c(5.8, 3.2, 5, 2.4, 2.5, 2.7, 3.5, 2.5, 3.5, 1.4, 
2.9, 2.4, 1.3, 12.1, 7.4, 5, 11.2, 5.6, 6.4, 8.8, 2.6, 3.5, 7, 
10, 4.5, 6, 6.5, 5.8, 5.4, 6.2, 8.9, 5.5, 4.8, 3.4, 6.5, 5, 4, 
6.4, 7.3, 4.4, 4.2, 1.7, 5.1, 3.6, 6.4, 3.4, 2.5, 2.6, 2.3, 2.3, 
3.2, 1.6, 1.7, 3.7, 8, 4.4, 3.1, 4.1, 5.9, 2.8, 5, 3.2, 3.7, 
3.4, 1.8, 3.2, 1.2, 4.1, 5.2, 4.5, 4.8, 7.1, 7.3, 4.6, 8.4, 3.4, 
5.2, 6.1, 4.3, 4.5, 4.5, 6.5, 2.8, 6.3, 5.3, 8.2, 3.8, 4.3, 4.2, 
3.4, 5.4, 7.9, 1.2, 1.4, 1.4, 6.6, 6.8, 4.2, 2.9, 3.1, 5.3, 2.6, 
3.2, 2.9, 1.7, 1.9, 1.4, 8, 8, 4, 5, 4.3, 2.9, 6.9, 3, 8.7, 4.5, 
4.2, 6.6, 4.4, 2.7, 4.4, 4.3, 2.8), group = c("Source0", "Source0", 
"Source0", "Source0", "Source0", "Source0", "Source0", "Source0", 
"Source0", "Source0", "Source0", "Source0", "Source0", "Source1", 
"Source1", "Source1", "Source1", "Source1", "Source1", "Source1", 
"Source1", "Source1", "Source1", "Source1", "Source1", "Source1", 
"Source1", "Source1", "Source1", "Source1", "Source1", "Source2", 
"Source2", "Source2", "Source2", "Source2", "Source2", "Source2", 
"Source2", "Source2", "Source2", "Source2", "Source2", "Source2", 
"Source2", "Source2", "Source2", "Source2", "Source2", "Source2", 
"Source2", "Source2", "Source2", "Source2", "Source3", "Source3", 
"Source3", "Source3", "Source3", "Source3", "Source3", "Source3", 
"Source3", "Source3", "Source3", "Source3", "Source3", "Source4", 
"Source4", "Source4", "Source4", "Source4", "Source4", "Source5", 
"Source5", "Source5", "Source5", "Source5", "Source5", "Source5", 
"Source5", "Source5", "Source5", "Source5", "Source6", "Source6", 
"Source6", "Source6", "Source7", "Source7", "Source7", "Source7", 
"Source7", "Source7", "Source7", "Source8", "Source8", "Source8", 
"Source8", "Source8", "Source8", "Source8", "Source8", "Source8", 
"Source8", "Source8", "Source8", "Source9", "Source9", "Source9", 
"Source9", "Source9", "Source9", "Source9", "Source9", "Source10", 
"Source10", "Source10", "Source10", "Source10", "Source10", "Source10", 
"Source10", "Source10")), .Names = c("source", "target", "value", 
"group"), row.names = c(NA, -124L), class = "data.frame")), .Names = c("nodes", 
"links"))
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1 回答 1

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颜色调色板由colourScale参数确定。它应该是一个字符串，其中包含用于定义调色板的有效 D3 代码。在使用 D3v4+ 的当前版本中networkD3，语法d3.scaleOrdinal().range(["#7d3945", "#e0677b", "#244457"])是有效的，但可以缩短为d3.scaleOrdinal(["#7d3945", "#e0677b", "#244457"]). 还有其他可能性，请参见此处。您选择/定义的调色板中的颜色数量必须等于或大于数据中定义的唯一组的总数，否则它将循环回到调色板的开头以将颜色分配给更多组。数据中定义的第一组将被分配调色板中的第一种颜色，依此类推。

NodeGroup和参数分别定义了您的和data.framesLinkGroup中列的名称，它们定义了每个节点/链接的组值。节点和链接都将根据它们的组值和基于正在使用的调色板分配的颜色进行着色。NodesLinks

将iteration参数设置为 0 将有效地阻止放置算法运行，因此您的节点将按照它们在原始数据中的顺序进行排序。正如您所指出的，这基本上违背了 sankeyNetwork 的主要目的。

使用您发布的数据...

library(networkD3)

colors <- paste(networkD3_data$nodes$colors, collapse = '", "')
colorJS <- paste('d3.scaleOrdinal(["', colors, '"])')

sankeyNetwork(Links = networkD3_data$links, Nodes = networkD3_data$nodes, 
              Source = 'source', Target = 'target', Value = 'value', 
              NodeID = 'name', NodeGroup = "group", LinkGroup = "group",
              colourScale = colorJS,
              iterations = 0)

透明度/不透明度可以通过在 D3 调色板中设置 RGBA 颜色来实现，但您需要使用十进制 RGB 表示法（据我所知）。您需要将 like#ff0043转换为d3.rgb(255,0,67,0.5)，其中最后一个数字是一个介于 0 和 1 之间的数字，用于定义不透明度的级别。例如...

colors <- paste(sapply(networkD3_data$nodes$colors, function(x) { paste0("d3.rgb(", paste(c(col2rgb(x), 0.5), collapse = "," ), ")") }), collapse = ", ")
colorJS <- paste0('d3.scaleOrdinal([', colors, '])')
sankeyNetwork(Links = networkD3_data$links, Nodes = networkD3_data$nodes,
              Source = 'source', Target = 'target', Value = 'value',
              NodeID = 'name', NodeGroup = "group", LinkGroup = "group",
              colourScale = colorJS,
              iterations = 0)
于 2017-10-10T13:00:19.293 回答