Feature: colourbar, symmetric about zero

[rpnaut]

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Problem description

Using the GUI of psyplot is somehow frustating for quantities you want to visualize with a range symmetric about zero. There is no colourbar with white at the center and useful colors at the left and right end.

Expected

Extend the colourbars by those of ncview. That would be really advantageous.

[Chilipp]

hey @rpnaut. Are you using the psyplot-gui? Then this is actually already possible

roundedsym.mp4

or via script, e.g.

sp.update(bounds="roundedsym", cmap="RdBu")

there is also the "red_white_blue" cmap, if you like.

You can should add your own colormaps using the 'colors.cmaps' rcParam, e.g. via

cat >> ~/.config/psyplot/psyplotrc.yml << EOF

colors.cmaps: 
  rgb: ['r', 'g', 'b']

EOF

and then `sp.update(cmap="rgb")