Custom Spacing for colors in discrete colorbar-CodePudding

Essentially, I want to make my discrete, binary, colorbar in python matplotlib/seaborn to have custom spacing, so that one color takes up more of the color bar than the other.

I am using seaborn heatmap to plot some binary data I have. Each row contains p different items which were labeled by my binary classifier. Four out of eleven rows belong to Class1 and the other 7 belong to Class0. I would like to have the colorbar help illustrate that breakdown, so that 4/11 of the colorbar is colored the same as Class1.

# make colormap
yellow = (249/255, 231/255, 85/255)
blue = (62/255,11/255, 81/255)
color_list = [yellow, blue]
cmap = ListedColormap(color_list)
    
# plot data
h = sns.heatmap(binary_preds, cmap=cmap, cbar_kws = dict(use_gridspec=False,location="left"))

for i in range(len(binary_preds)   1):
    h.axhline(i, color='white', lw=5)

colorbar = h.collections[0].colorbar
colorbar.set_ticks([.25,.75])
colorbar.set_ticklabels(['Class0', 'Class1'])

## code I would like:
# colorbar.set_spacing([0.37, 63])

Resulting colorbar:

What my code generates:

How I'd like it to be (manually adjusted colorbar spacing):

What I want it to generate (manually adjusted colorbar spacing)

CodePudding user response：

The following approach uses a