Plotly：如何在我的 Sankey 图列上写文本？

Question

我构建了一个 Sankey diagram using plotly。我想给列命名，给每个列一个列标题，如下面的红色文本：

如何写这些栏目标题？

Answer 1

您可以使用注释添加文本，使用 0, 1, 2 的 x 值将 xref 设置为 "x"，并使用 1.05 的 y 值yref 设置为 "paper"，如纸张坐标。这将确保注释位于图上方。

import plotly.graph_objects as go

fig = go.Figure(data=[go.Sankey(
    node = dict(
      pad = 15,
      thickness = 20,
      line = dict(color = "black", width = 0.5),
      label = ["A1", "A2", "B1", "B2", "C1", "C2"],
      color = "blue"
    ),
    link = dict(
      source = [0, 1, 0, 2, 3, 3], # indices correspond to labels, eg A1, A2, A1, B1, ...
      target = [2, 3, 3, 4, 4, 5],
      value = [8, 4, 2, 8, 4, 2]
  ))])

layout={
      
     }

for x_coordinate, column_name in enumerate(["column 1","column 2","column 3"]):
  fig.add_annotation(
          x=x_coordinate,
          y=1.05,
          xref="x",
          yref="paper",
          text=column_name,
          showarrow=False,
          font=dict(
              family="Courier New, monospace",
              size=16,
              color="tomato"
              ),
          align="center",
          )

fig.update_layout(
  title_text="Basic Sankey Diagram", 
  xaxis={
  'showgrid': False, # thin lines in the background
  'zeroline': False, # thick line at x=0
  'visible': False,  # numbers below
  },
  yaxis={
  'showgrid': False, # thin lines in the background
  'zeroline': False, # thick line at x=0
  'visible': False,  # numbers below
  }, plot_bgcolor='rgba(0,0,0,0)', font_size=10)

fig.show()

Answer 2

您似乎更喜欢 parcats 图而不是桑基图。但是如果你真的想用 sankey 来做这件事，对 Derek O 的答案稍作修改就可以避免生成你需要隐藏的轴。只需使用 xref="paper" 并将 x 值分布在 0 到 1 的范围内：

import plotly.graph_objects as go

fig = go.Figure(data=[go.Sankey(
    node = dict(
      pad = 15,
      thickness = 20,
      line = dict(color = "black", width = 0.5),
      label = ["A1", "A2", "B1", "B2", "C1", "C2"],
      color = "blue"
    ),
    link = dict(
      source = [0, 1, 0, 2, 3, 3], # indices correspond to labels, eg A1, A2, A1, B1, ...
      target = [2, 3, 3, 4, 4, 5],
      value = [8, 4, 2, 8, 4, 2]
  ))])

cols = ["column 1","column 2","column 3"]
for x_coordinate, column_name in enumerate(cols):
  fig.add_annotation(
          x=x_coordinate / (len(cols) - 1),
          y=1.05,
          xref="paper",
          yref="paper",
          text=column_name,
          showarrow=False,
          font=dict(
              family="Courier New, monospace",
              size=16,
              color="tomato"
              ),
          align="center",
          )

fig.show()

Plotly：如何在我的 Sankey 图列上写文本？

Plotly: how to write a text over my Sankey diagram columns?

plotly

sankey-diagram

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