A helper routine to generate a cmap and a norm instance which behave similar to contourf's levels and colors arguments.
The quantization levels used to construct the BoundaryNorm
. Value v
is quantized to level i
if lev[i] <= v < lev[i+1]
.
The fill color to use for each level. If extend is "neither" there must be n_level - 1
colors. For an extend of "min" or "max" add one extra color, and for an extend of "both" add two colors.
The behaviour when a value falls out of range of the given levels. See contourf
for details.
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https://matplotlib.org/3.5.1/api/_as_gen/matplotlib.colors.from_levels_and_colors.html