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Use vbar_stack when adding 2 vbars to same plot #55

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Merged
merged 2 commits into from
Jun 9, 2025
Merged

Use vbar_stack when adding 2 vbars to same plot #55

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5e44c62
use stack when adding 2 vbars to same plot
gabalafou Jun 6, 2025
5b3df56
vbar_stack
gabalafou Jun 9, 2025
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27 changes: 13 additions & 14 deletions notebooks/06_data_sources.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -295,34 +295,33 @@
"source": [
"from bokeh.plotting import figure, show\n",
"from bokeh.models import ColumnDataSource\n",
"from bokeh.palettes import HighContrast3\n",
"\n",
"# create ColumnDataSource based on DataFrame from the demo data set\n",
"source = ColumnDataSource(monthly_values_df)\n",
"\n",
"# set up the figure\n",
"p = figure(\n",
" height=300,\n",
" x_range=source.data[\"month_name\"], # use the sequence of strings from the \"month_name\" column as categories\n",
" width=750,\n",
")\n",
"\n",
"# create a line renderer with data from the \"freight\" column\n",
"p.vbar(\n",
" x=\"month_name\", # use the sequence of strings from the \"month_name\" column as categories\n",
" top=\"freight\", # use the sequence of values from the \"freight\" column as values\n",
" width=0.9,\n",
" source=source,\n",
")\n",
"# plot values from these columns\n",
"columns = [\"freight\", \"passengers\", \"mail\"]\n",
"\n",
"# create a second line renderer with data from a different column\n",
"p.vbar(\n",
" x=\"month_name\", # use the sequence of strings from the \"month_name\" column as categories\n",
" top=\"passengers\", # use the sequence of values from the \"passengers\" column as values\n",
" # top=\"mail\", # 🔁 use this line instead of the one above to use data from the \"mail\" column\n",
"# use vbar_stack that stacks multiple vbar renderers\n",
"p.vbar_stack(\n",
" columns,\n",
" x=\"month_name\",\n",
" width=0.9,\n",
" color=\"tomato\",\n",
" source=source,\n",
" color=HighContrast3, # use the HighContrast color palette\n",
" legend_label=columns,\n",
")\n",
"\n",
"# move legend to left, to avoid overlap with bars\n",
"p.legend.location = \"top_left\"\n",
"\n",
"show(p)"
]
},
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