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Update Colorizer/ColorizingArtist to work with MultiNorm#30511

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@trygvradtrygvrad commentedSep 3, 2025•
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EDIT: closes#30511

This PR continues the work of#28658 and#28454,#29876, aiming toclose#14168. (Feature request: Bivariate colormapping)

This PR allows Colorizer and ColorizingArtist to work withMultiNorm andBivarColormap andMultivarColormap

i.e. this PR will allow:

importmatplotlib.pyplotaspltimportnumpyasnpimportmatplotlibasmpla=np.arange(12).reshape(3,4)b=np.arange(12).reshape(4,3).Tnorm=mpl.colors.Normalize(vmin=0,vmax=11)col=mpl.colorizer.Colorizer(cmap='BiOrangeBlue',norm=[norm,norm])plt.imshow(col.to_rgba((a,b)))
image

Features not included in this PR:

  • Exposes the functionality provided by MultiNorm together with BivarColormap and MultivarColormap to the plotting functionsaxes.imshow(...),axes.pcolor(...), andaxes.pcolormesh(...)`
  • fig.colorbar() equivalents for BivarColormap and MultivarColormap
  • Examples in the docs

PR checklist

  • new and changed code istested

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Thank you for the feedback@QuLogic and apologies for my sloppy mistakes :)

improved testing for colorizer+multinormApply suggestions from code reviewCo-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>updates based on feedback from@QuLogic
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As I mentioned on the call, I think this looks okay from a low-level point-of-view, but I am at this point uncertain as to the high-level status. I hope someone more familiar with the current state can confirm.

PS,@trygvrad if you have some time to pop in to the call, it would be good to just re-iterate the current state succinctly, as I'm not sure everyone is up-to-speed right now.

@trygvradtrygvrad mentioned this pull requestSep 24, 2025
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@QuLogicQuLogicQuLogic approved these changes

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Feature request: Bivariate colormapping
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