Skip to content

Fix colormap handling for Matplotlib 3.11 #4

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
HugoFara wants to merge 3 commits into
base: main
Choose a base branch
from
Open

Fix colormap handling for Matplotlib 3.11 #4

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
d9417c5
Replace matplotlib.cm.get_cmap, removed in Matplotlib 3.11
HugoFara Aug 13, 2026
9e5a8b2
Use Colormap.with_extremes instead of set_under/set_over
HugoFara Aug 13, 2026
a2f8f65
Keep get_cmap's handling of colormap_in=None
HugoFara Aug 13, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
27 changes: 20 additions & 7 deletions src/MNHPy/Panel_Plot.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11,13 +11,28 @@
import matplotlib as mpl
# mpl.use('Agg')
import matplotlib.pyplot as plt
from matplotlib import cm
from matplotlib.colors import ListedColormap
from matplotlib.colors import Colormap, ListedColormap
import numpy as np
import cartopy
import cartopy.feature as cfeature


def get_cmap(colormap_in, lut):
"""Return colormap_in resampled to lut colors

Replaces matplotlib.cm.get_cmap(name, lut), deprecated in Matplotlib 3.7
and removed in 3.11. Both special cases of the original are kept: None
means the rcParams default, and a Colormap instance is returned unchanged.
resampled() returns a new object, so the caller may mutate it without
touching the registered colormap.
"""
if colormap_in is None:
colormap_in = mpl.rcParams['image.cmap']
if isinstance(colormap_in, Colormap):
return colormap_in
return mpl.colormaps[colormap_in].resampled(lut)


class PanelPlot():

def __init__(self, nb_l, nb_c, Lfigsize, bigtitle, bigtitlepad=0.95, titlepad=40, minmaxpad=1.03, timepad=-0.06, lateralminmaxpad=0.86,
Expand Down Expand Up @@ -111,7 +126,7 @@ def addWhitecm(self, colormap_in, nb_level, whiteTop=False):
"""
Add a white color at the top (whiteTop=True) or bottom of the colormap w.r.t. the number of independent colors used
"""
color_map = cm.get_cmap(colormap_in, 256)
color_map = get_cmap(colormap_in, 256)
newcolor_map = color_map(np.linspace(0, 1, 256))
whites = np.array([1, 1, 1, 1]) # RBG code + opacity
if whiteTop:
Expand All @@ -127,11 +142,9 @@ def addColorcm(self, colormap_in):
"""
Assign the last color of the colormap to the values out of range
"""
colormap = cm.get_cmap(colormap_in, 256)
colormap = get_cmap(colormap_in, 256)

colormap.set_under(color=colormap(1./256))
colormap.set_over(color=colormap(1.-1./256))
return(colormap)
return colormap.with_extremes(under=colormap(1./256), over=colormap(1.-1./256))

def set_Title(self, ax, i, title, Lid_overlap, xlab, ylab):
"""
Expand Down