Multiple issues with transforms

@etpinard

I’ve been trying to add transforms to multiple trace types with varying degrees of success. Documentation doesn’t make it clear which trace types support transforms. All I know from discussion with @etpinard, is that anything that takes 2d arrays as input doesn’t support them.
react-chart-editor as of now does not prepopulate target/targetsrc:

      "transforms": [
        {
          "type": "filter",
          "target": [],
          "targetsrc": null
        }
      ]

Results:

scatter3d:

filter: many warnings: [.Offscreen-For-WebGL-0x7fef4b0d6800]RENDER WARNING: Render count or primcount is 0.

-> https://codepen.io/etpinard/pen/dgWJZg

scatter3d + marker:’line’

filter: Uncaught (in promise) TypeError: Cannot read property 'slice' of undefined at LinePlot.proto.update

-> https://codepen.io/etpinard/pen/Edmobo

cone, streamtube, scattergeo, table, heatmap (with 1d array input), contour (with 1d array input)

any transforms: as I add them to data, they never get added to fullData

choropleth, scatterternary, scatterpolar, pie:

aggregate: Error while plotting: TypeError: Cannot set property 'type' of undefined at Object.plots.supplyTransformDefaults

pie:

filter: Error: <path> attribute d: Expected number, "MNaN,NaNa189.5,18…".

-> https://codepen.io/etpinard/pen/wYdppB

2d contour histogram:

filter: Error while plotting: TypeError: Cannot read property 'length' of undefined at makeCrossings (plotly-with-meta.js?ab3a:146042)

Edit:
Add this one to the list:

When defining a scatter with just Y defined, and than add an aggregate:
Uncaught TypeError: Cannot set property 'type' of undefined at Object.plots.supplyTransformDefaults
https://codepen.io/dmt0/pen/xJoWoY

This one got fixed in: #3093

Ok. Thanks for the report!

What does targetsrc: null which isn't a plotly.js attribute) do?. I suspect it injects target: [] in the user data, but I would like to confirm

But yeah, we could do better than declaring transforms in the schema for all trace types (including the ones that don't support them yet):

plotly.js/src/plots/attributes.js

Lines 160 to 167 in 7bba266

    
           transforms: { 
        
               _isLinkedToArray: 'transform', 
        
               editType: 'calc', 
        
               description: [ 
        
                   'An array of operations that manipulate the trace data,', 
        
                   'for example filtering or sorting the data arrays.' 
        
               ].join(' ') 
        
           }

yes, in fullData I see target: Array[0]

Most of these problems occur because transforms[i].target: [] turns data arrays into [] during the calc step (as filter transforms are applied using _module.calcTransform) and the trace type module plot method expect empty data array to be associated with visible: false (from the supplyDefault logic) traces.

Note that

Plotly.newPlot(gd, [{
  y: [1, 2, 1, 3],
  transforms: [{
    type: 'filter',
    target: []
  }]
}], {
  showlegend: true
})

has a legend item, whereas

Plotly.newPlot(gd, [{
  y: [],
}], {
  showlegend: true
})

does not, which I believe is correct.

Perhaps, the most robust to handle this would be to make transform items with target: [] (or any other falsy value?) set enable to false similar to how traces with empty data array get visible:false during supplyDefaults.

scatterpolar now looks like:

https://codepen.io/etpinard/pen/YJVYYd

@antoinerg

As far as I can tell, @antoinerg 's #3158 removed the transforms attribute container from all traces that do not support transforms.

set enabled:false when filter target array is empty

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Multiple issues with transforms #2908

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	transforms: {
	_isLinkedToArray: 'transform',
	editType: 'calc',
	description: [
	'An array of operations that manipulate the trace data,',
	'for example filtering or sorting the data arrays.'
	].join(' ')
	}

Multiple issues with transforms #2908

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etpinard commented on Aug 15, 2018

etpinard commented on Aug 15, 2018

dmt0 commented on Aug 16, 2018

etpinard commented on Oct 10, 2018

etpinard commented on Oct 10, 2018

etpinard commented on Oct 30, 2018

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