在Plotly中向甘特图添加自定义标记

import plotly.graph_objects as go

data = [
    go.Bar(
        x=['Task 1', 'Task 2', 'Task 3'],
        y=[1, 2, 3],
        base=[0, 0, 0],
        width=[3, 4, 2],
        orientation='h'
    )
]

layout = go.Layout(
    title='Gantt Chart with Custom Markers',
    yaxis=dict(showgrid=False, showticklabels=False),
    xaxis=dict(showgrid=False),
    barmode='stack'
)

annotations = [
    dict(
        x='Task 1',
        y=1,
        xref='x',
        yref='y',
        text='Custom Marker 1',
        showarrow=True,
        arrowhead=7,
        ax=0,
        ay=-40
    ),
    dict(
        x='Task 2',
        y=2,
        xref='x',
        yref='y',
        text='Custom Marker 2',
        showarrow=True,
        arrowhead=7,
        ax=0,
        ay=-40
    ),
    dict(
        x='Task 3',
        y=3,
        xref='x',
        yref='y',
        text='Custom Marker 3',
        showarrow=True,
        arrowhead=7,
        ax=0,
        ay=-40
    )
]

layout['annotations'] = annotations

fig = go.Figure(data=data, layout=layout)
fig.show()