Plotly Graphs: Changing the Display Position of Legends (Labels) [Layout]

By default, the legend (label) of Plotly is displayed to the right of the graph.

This can shorten the width of the graph.

To expand the display width of the graph and make it easier to read, I will move the legend.

　

For those who want to know about “Plotly,” please see a previous article first.

The Challenge and Goal

With Plotly, you can display interactive graphs.

However, the layout can sometimes make the graph hard to read.

For example, when displaying a line graph on a smartphone (portrait orientation) with the legend in its initial position.

The graph becomes squeezed due to insufficient screen width.

　

Change the position of the legend to increase the width of the line graph display!

The source code before the change can be checked in this article.

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Changing the Position of the Legend with update_layout

Before Change

After Change

Let’s call update_layout() and change the position of the legend.

　

The width of the graph has slightly increased. The source code for this graph is here.

import pandas as pd
import plotly.graph_objs as go
from plotly.subplots import make_subplots
...
fig.update_layout(legend=dict(x=0.01, y=0.99, xanchor='left', yanchor='top', orientation='h'))
...

Lines 19 to 24 pass arguments in fig.update_layout() to change the position of the legend.

Understanding the Values Passed to legend in update_layout

　

I managed to move it, but I don’t understand the meaning of the values.

　

Let’s explore the values of the legend!

Explanation of Each Item

fig.update_layout(legend=dict(x=0.01, y=0.99, xanchor='left', yanchor='top', orientation='h'))

① : x, y

Represents the X and Y coordinates. The bottom left of the graph is (0, 0) and the top right is (1, 1).

②: xanchor, yanchor

Specifies which part of the legend represents the coordinates specified in ①.

If you pass left and top, the top left of the legend matches the X and Y coordinates.

③: orientation

Aligns the legend horizontally.

Experiment

　

Let’s try changing the items passed to legend and see what happens.

fig.update_layout(legend=dict(x=0.9, y=-0.1, xanchor='left', yanchor='top'))

By changing the values of x, y, the position of the legend changed significantly.

You can set values smaller than 0 and larger than 1 for the coordinates.

And by removing orientation, the legend becomes vertically aligned.

　

We can now freely position the legend!

Reference Links

In solving this challenge, I referred to the following site.

Watching the AI

Python Plotly入門 – レイアウト設定

Plotly Official Website

Legends

Summary

To share the monthly access situation, I use Plotly to create interactive graphs.

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