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Add safe_contourf_or_pcolormesh fallback function to improve plotting robustness #18

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Merged
llsuo merged 1 commit into from
Jun 13, 2025
Merged

Add safe_contourf_or_pcolormesh fallback function to improve plotting robustness #18

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19 changes: 15 additions & 4 deletions lib/plotting_functions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -684,13 +684,13 @@ def make_polar_plot(wks, case_nickname, base_nickname,
d2 = d2.sel(lat=slice(domain[2],domain[3]))
dif = dif.sel(lat=slice(domain[2],domain[3]))
pct = pct.sel(lat=slice(domain[2],domain[3]))

# add cyclic point to the data for better-looking plot
d1_cyclic, lon_cyclic = add_cyclic_point(d1, coord=d1.lon)
d2_cyclic, _ = add_cyclic_point(d2, coord=d2.lon) # since we can take difference, assume same longitude coord.
dif_cyclic, _ = add_cyclic_point(dif, coord=dif.lon)
pct_cyclic, _ = add_cyclic_point(pct, coord=pct.lon)

# -- deal with optional plotting arguments that might provide variable-dependent choices

# determine levels & color normalization:
Expand Down Expand Up @@ -798,6 +798,16 @@ def make_polar_plot(wks, case_nickname, base_nickname,
levs_diff = np.unique(np.array(levelsdiff))
levs_pctdiff = np.unique(np.array(levelspctdiff))

def safe_contourf_or_pcolormesh(ax, lons, lats, data, cmap, norm, levels=None, extend="both", transform=None):
try:
img = ax.contourf(lons, lats, data, levels=levels, cmap=cmap, norm=norm, extend=extend, transform=transform)
except Exception as e:
print(f"[contourf failed: {e}] Switching to pcolormesh.")
for coll in list(ax.collections):
coll.remove()
img = ax.pcolormesh(lons, lats, data, cmap=cmap, norm=norm, transform=transform)
return img

if len(levs) < 2:
img1 = ax1.contourf(lons, lats, d1_cyclic, transform=ccrs.PlateCarree(), colors="w", norm=norm1, extend = "both")
ax1.text(0.4, 0.4, empty_message, transform=ax1.transAxes, bbox=props)
Expand All @@ -806,8 +816,9 @@ def make_polar_plot(wks, case_nickname, base_nickname,
ax2.text(0.4, 0.4, empty_message, transform=ax2.transAxes, bbox=props)
else:
img1 = ax1.contourf(lons, lats, d1_cyclic, transform=ccrs.PlateCarree(), cmap=cmap1, norm=norm1, levels=levels1, extend = "both")
img2 = ax2.contourf(lons, lats, d2_cyclic, transform=ccrs.PlateCarree(), cmap=cmap1, norm=norm1, levels=levels1, extend = "both")

#img2 = ax2.contourf(lons, lats, d2_cyclic, transform=ccrs.PlateCarree(), cmap=cmap1, norm=norm1, levels=levels1, extend = "both")
img2 = safe_contourf_or_pcolormesh(ax2, lons, lats, d2_cyclic,transform=ccrs.PlateCarree(), cmap=cmap1, norm=norm1, levels=levels1, extend="both", )

if len(levs_pctdiff) < 2:
img3 = ax3.contourf(lons, lats, pct_cyclic, transform=ccrs.PlateCarree(), colors="w", norm=pctnorm, transform_first=True)
ax3.text(0.4, 0.4, empty_message, transform=ax3.transAxes, bbox=props)
Expand Down
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