CODEWITHSUNDEEP
pythonaltair
user12394113
user12394113

Reputation: 401

Scale only one axis in Altair with interactive plot

I am using Altair 4.1.0 to create interactive plots with Python. I want to be able to zoom in some part of my chart by scaling only one axis, for example only the y-axis while keeping the x-axis fixed. From the documentation I could not find a way to do this. My understanding is that alt.interactive() corresponds to .add_selection(alt.selection_interval(bind='scales')), but still I don't see how to achieve my purpose. Is there any way to do this in Altair?

Upvotes: 1

Views: 2173

Answers (1)

jakevdp
jakevdp

Reputation: 86330

alt.Chart.interactive has bind_x and bind_y arguments which default to True. If you set either of these to False, that scale will not be part of the interaction:

chart.interactive(bind_x=False)

Alternatively, you can do this manually by specifying the encodings you want bound (['x'], ['y'], or ['x', 'y'], which is the default):

chart.add_selection(alt.selection_interval(bind='scales', encodings=['y']))

Upvotes: 2

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