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Nov 19, 2019
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sankey nodes position #189

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sankey nodes position
Nov 11, 2019
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29 changes: 27 additions & 2 deletions python/sankey-diagram.md
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Expand Up @@ -6,7 +6,7 @@ jupyter:
extension: .md
format_name: markdown
format_version: '1.1'
jupytext_version: 1.1.1
jupytext_version: 1.2.1
kernel_info:
name: python2
kernelspec:
Expand All @@ -22,7 +22,7 @@ jupyter:
name: python
nbconvert_exporter: python
pygments_lexer: ipython3
version: 3.6.7
version: 3.7.3
plotly:
description: How to make Sankey Diagrams in Python with Plotly.
display_as: basic
Expand All @@ -39,6 +39,7 @@ A [Sankey diagram](https://en.wikipedia.org/wiki/Sankey_diagram) is a flow diagr


### Basic Sankey Diagram
Sankey diagrams visualize the contributions to a flow by defining [source](https://plot.ly/python/reference/#sankey-link-source) to represent the source node, [target](https://plot.ly/python/reference/#sankey-link-target) for the target node, [value](https://plot.ly/python/reference/#sankey-link-value) to set the flow volum, and [label](https://plot.ly/python/reference/#sankey-node-label) that shows the node name.

```python
import plotly.graph_objects as go
Expand All @@ -64,6 +65,7 @@ fig.show()
### More complex Sankey diagram

```python inputHidden=false outputHidden=false
import plotly.graph_objects as go
import urllib, json

url = 'https://raw.githubusercontent.com/plotly/plotly.js/master/test/image/mocks/sankey_energy.json'
Expand Down Expand Up @@ -96,6 +98,7 @@ fig.show()
### Style Sankey Diagram

```python
import plotly.graph_objects as go
import urllib, json

url = 'https://raw.githubusercontent.com/plotly/plotly.js/master/test/image/mocks/sankey_energy.json'
Expand Down Expand Up @@ -129,6 +132,28 @@ fig.update_layout(
fig.show()
```

### Define Node Position

The following example sets [node.x](https://plot.ly/python/reference/#sankey-node-x) and `node.y` to place nodes in the specified locations, except in the `snap arrangement` (default behaviour when `node.x` and `node.y` are not defined) to avoid overlapping of the nodes, therefore, an automatic snapping of elements will be set to define the padding between nodes via [nodepad](https://plot.ly/python/reference/#sankey-node-pad). The other possible arrangements are:<font color='blue'> 1)</font> perpendicular <font color='blue'>2)</font> freeform <font color='blue'>3)</font> fixed

```python
import plotly.graph_objects as go

fig = go.Figure(go.Sankey(
arrangement = "snap",
node = {
"label": ["A", "B", "C", "D", "E", "F"],
"x": [0.2, 0.1, 0.5, 0.7, 0.3, 0.5],
"y": [0.7, 0.5, 0.2, 0.4, 0.2, 0.3],
'pad':10}, # 10 Pixels
link = {
"source": [0, 0, 1, 2, 5, 4, 3, 5],
"target": [5, 3, 4, 3, 0, 2, 2, 3],
"value": [1, 2, 1, 1, 1, 1, 1, 2]}))

fig.show()
```

### Reference

See [https://plot.ly/python/reference/#sankey](https://plot.ly/python/reference/#sankey) for more information and options!