Matching axes

[alexcjohnson]

We should allow two (or more) axes to not just share a scaling, but actually force precisely equal range. Use case is plots like this one:

This came up in #272 (comment) but was not addressed in #1522 - opening this as a new issue so we don't forget about it.

[tishihar94]

Hi, any progress with this?

I have two side-by-side scatter plots that are identical, except for the colors of each point (One plot is colored by cluster and the other has a colorscale). It would be great if I could synchronize the zoom/pan so that both the X and Y axis are preserved But I can only get it to synchronize the Y-axis even if I do shared_xaxes=True and shared_yaxes=True.

[alexcjohnson]

We're probably going to need to do this as part of #2372, which is up next, so that the x and y for the same variable can have matched ranges (keeping the diagonal panes diagonal as well). But when we do this it will include matched x and matched y axes as well as x matching y.

[mschilli87]

@alexcjohnson: #2372 was closed via #2505 but this is still open. So is this possible by now and if so how? I have two scatter plots below each other via subplot and I'd like to have the same axes range on both and zoom synchronously. Am I on the right track?

[alexcjohnson]

@mschilli87 I'm afraid matching axes was not included in the initial SPLOM implementation and has not yet been done on its own, so it's correct for this issue to remain open. In the meantime you may be able to listen to plotly_relayout events and issue new Plotly.relayout calls to keep the axes in sync - but be careful about avoiding infinite loops!

[nicolaskruchten]

A few items that come to mind for ideal 'matched' axes:

• category order should match
• histogram auto-binning should align

[etpinard]

Quick question: say we have:

Plotly.newPlot(gd, [{
  y: [1, 2, 1]
}, {
  y: [2, 1, 2, 3],
  xaxis: 'x2'
}, {
  y: [0, 1],
  xaxis: 'x3'
}], {
  grid: {rows: 1, columns: 3},
  xaxis2: {matches: 'x'},
  xaxis3: {matches: 'x'}
})

should the axis autorange be computed using data from the three traces or just the first trace?

I think the former would be pretty cool, but I'd like to confirm.