Plotly vertical line with legend in python

Question

In plotly website, there is example that can use shape function add vertical or horizontal line in plotly.

import plotly.plotly as py
import plotly.graph_objs as go

trace0 = go.Scatter(
    x=[2, 3.5, 6],
    y=[1, 1.5, 1],
    mode='text',
)
data = [trace0]
layout = {
    'xaxis': {
        'range': [0, 7]
    },
    'yaxis': {
        'range': [0, 2.5]
    },
    'shapes': [
        # Line Horizontal
        {
            'type': 'line',
            'x0': 2,
            'y0': 2,
            'x1': 5,
            'y1': 2,
            'line': {
                'color': 'rgb(50, 171, 96)',
                'width': 4,
                'dash': 'dashdot',
            }
        }
    ]
}

fig = {
    'data': data,
    'layout': layout,
}

py.iplot(fig, filename='shapes-lines')

But I wonder if there is any ways to add legend for the horizontal lines.

@Mike_H Is this really a duplicate? OP is asking for legends for shapes, and not the shapes themselves. Your suggested post includes a vertical line to show the median of specified groups. And as you can see, the median is not included in the legend. — vestland
– vestland, Commented Jun 3, 2019 at 11:39

rusiano · Accepted Answer · 2020-06-10 08:08:38Z

2

I think the only option at the moment is to plot it as a Scatter trace.

For example this snippet of code

import plotly.graph_objects as pgo
fig = pgo.Figure()

fig.add_traces([
    pgo.Scatter(
        x=[2, 3.5, 6],
        y=[1, 1.5, 1],
        name='Yet Another Trace'
    ), 
    pgo.Scatter(
        x=[2,5],
        y=[2,2], 
        line={
            'color': 'rgb(50, 171, 96)',
            'width': 4,
            'dash': 'dashdot',
        }, name='Horizontal Line'
    )
])

fig.update_layout(**{
    'xaxis': {
        'range': [0, 7]
    },
    'yaxis': {
        'range': [0, 2.5]
    }
})

fig

generates this result:

answered Jun 10, 2020 at 8:08

rusiano

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