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@logankopas
Description
This is likely a similar issue to plotly/plotly.js#6199
Plotly version: 6.2.0
Minimal Example
import plotly.graph_objects as go
import pandas as pd
import datetime
data = [
{"date": datetime.date(2025,7,20), "net_sales": 23.34, "gross_sales": 32.98},
{"date": datetime.date(2025,7,21), "net_sales": 45.21, "gross_sales": 68.12},
{"date": datetime.date(2025,7,22), "net_sales": 12.98, "gross_sales": 34.54},
{"date": datetime.date(2025,7,23), "net_sales": 41.32, "gross_sales": 45.32},
]
df = pd.DataFrame.from_records(data)
def make_figure(df, width=None):
fig = go.Figure()
fig.add_trace(go.Bar(
x=df['date'],
y=df['net_sales'],
xperiod=24*60*60*1000,
xperiod0=df['date'].min(),
xperiodalignment="middle"
))
fig.add_trace(go.Bar(
x=df['date'],
y=df['gross_sales'],
xperiod=24*60*60*1000,
xperiod0=df['date'].min(),
xperiodalignment="middle"
))
fig.update_layout(
xaxis={
'ticklabelmode': 'period',
'tickmode': 'auto',
'dtick': 24*60*60*1000,
'range': (df['date'].min(), df['date'].max() + datetime.timedelta(days=1))
})
fig.show(renderer="browser")
make_figure(df)
make_figure(df[0:1])
When plotting a bar chart of aggregated timeseries data, strange behaviour happens when there's only 1 data point or group. When there are multiple bars each bar is displayed as one would expect (first screenshot below), but when there's only a single data point the bar is invisible, and specifically the bar width is set to 1ms or 0.5px (second screenshot).
Image Image
