使用Plotly在热图单元格上添加矩形面片

import plotly.graph_objects as go

data = [
    go.Heatmap(
        z=[[1, 2, 3],
           [4, 5, 6],
           [7, 8, 9]],
        colorscale='Viridis'
    )
]

layout = go.Layout(
    title='Heatmap with Rectangular Patches',
    xaxis=dict(title='X-axis'),
    yaxis=dict(title='Y-axis')
)

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

fig.add_shape(
    type='rect',
    x0=0, y0=0, x1=1, y1=1,
    fillcolor='rgba(255, 0, 0, 0.2)',
    line=dict(color='rgba(255, 0, 0, 1)', width=2)
)

fig.show()