How to centre the colorbar of a figure？

[donglx2018]

Description

An inset colorbar can not centred.
The loc parameter has no centering option.

Steps to reproduce

A "Minimal, Complete and Verifiable Example" will make it much easier for maintainers to help you.

import proplot as pplt
import numpy as np

x = np.array([1,2,3,4,5,6])
y = np.array([1, 2])
data = [[np.nan,np.nan,np.nan,np.nan,np.nan,np.nan],[1,2,2,1,3,4]]


with pplt.rc.context({'cmap': 'Grays', 'cmap.levels': 21}):
    # Figure
    fig = pplt.figure(refwidth=2.3, share=False)
    axs = fig.subplots(ncols=1)
    axs.format(xlabel='xlabel', ylabel='ylabel',xlocator=1, ylocator=1, )
    hs=axs[0].pcolor( data, cmap='colorblind', levels=pplt.arange(0, 9,1))
    axs.colorbar(hs, loc='ll',length=12,) 

Expected behavior:
I want the colorbar in the figure to be centred.
Actual behavior:

Proplot version

matplotlib version is 3.3.4
proplot version is 0.9.5

[AWSisco]

I don't think a centered colorbar is currently supported by proplot.

However, I've occasionally used inset_axes and loc='fill' as a hacky way to place colorbars at my own user-specified locations within a subplot. You will lose the frame around your colorbar if you take this route, but maybe it gets you closer to what you're looking for.

import proplot as pplt
import numpy as np

data = [[np.nan,np.nan,np.nan,np.nan,np.nan,np.nan],[1,2,2,1,3,4]]

fig, ax = pplt.subplots(aspect=(1,1))
ax.format(xlabel='xlabel',ylabel='ylabel',xlocator=1,ylocator=1,grid=False)

p = ax.pcolor(data,levels=pplt.arange(0,9,1),cmap='colorblind')

iax = ax.inset_axes([0.15,0.1,0.7,0.05],zoom=False)
iax.colorbar(p,loc='fill',locator=3)

[donglx2018]

@AWSisco Thanks! It works.