Note
Click here to download the full example code
Circular Voronoi Cartogram¶
Population cartogram of US States fitted inside a custom circular boundary.
Build a circular boundary and run the cartogram inside it.
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import carto_flow.data as examples
import carto_flow.voronoi_cartogram as vor
us_states = examples.load_us_census(population=True)
result = vor.create_voronoi_cartogram(
us_states,
weights="Population (Millions)",
boundary="circle",
backend=vor.RasterBackend(resolution=256),
options=vor.VoronoiOptions(n_iter=300, area_cv_tol=0.05),
)
Out:
/home/runner/work/carto-flow/carto-flow/.venv/lib/python3.12/site-packages/shapely/decorators.py:173: DeprecationWarning: The 'resolution' argument is deprecated. Use 'quad_segs' instead
result = func(*args, **kwargs)
Plot the cartogram.
fig, ax = plt.subplots(figsize=(8, 7))
result.plot(
"Population (Millions)",
ax=ax,
cmap="RdYlGn_r",
vmin=0,
vmax=40,
legend=True,
legend_kwds={"shrink": 0.6, "label": "Population (Millions)"},
)
ax.set(title="Cartogram of US States by Population — circular boundary")
ax.axis("off")
plt.tight_layout()
Total running time of the script: ( 0 minutes 1.835 seconds)
Download Python source code: plot_voronoi_custom_boundary.py
Download Jupyter notebook: plot_voronoi_custom_boundary.ipynb