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[BUG]: `axis.layer` / `axis.zerolinelayer`: `'above traces'` do not render above `scattergl` traces

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
55/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
javascript
Área
data-visualization

Línea de trabajo

Start by running the linked CodePen reproductions and tracing how scattergl rendering interacts with the Cartesian axis and zeroline layer settings. Done means zerolinelayer: 'above traces' visibly places the zeroline above scattergl markers, while the documented behavior remains correct for the line-chart example.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

bug
Description:

For Cartesian axes/subplots (for example, those containing scatter traces),
the reference documentation states that:

layer

Parent: layout.xaxis
Type: enumerated , one of ( "above traces" | "below traces" )
Default: "above traces"
Sets the layer on which this axis is displayed. If "above traces", this axis is displayed above all the subplot's traces If "below traces", this axis is displayed below all the subplot's traces, but above the grid lines. Useful when used together with scatter-like traces with cliponaxis set to "false" to show markers and/or text nodes above this axis.

zerolinelayer

Parent: layout.xaxis
Type: enumerated , one of ( "above traces" | "below traces" )
Default: "below traces"
Sets the layer on which this zeroline is displayed. If "above traces", this zeroline is displayed above all the subplot's traces If "below traces", this zeroline is displayed below all the subplot's traces, but above the grid lines. Limitation: "zerolinelayer" currently has no effect if the "zorder" property is set on any trace.

However, this does not work for scattergl.

A WebGL marker remains visually above the zeroline (y = 0) even when:

yaxis: {
  zerolinelayer: 'above traces'
}

is set.

Reproducible example:

https://codepen.io/Lexachoc/pen/xbqdWqm

https://codepen.io/Lexachoc/pen/EaWmLKY (line chart)

Relationship to cliponaxis:

This is separate from the feature request in #8074.

cliponaxis controls whether markers/text are clipped to the subplot's plotting area.

axis.layer / axis.zerolinelayer, on the other hand, control the stacking order of the axis / zeroline relative to traces.

Effect of axis.layer / axis.zerolinelayer: 'above traces':
Image

Effect of axis.layer / axis.zerolinelayer: 'above traces' for line chart (the red line should not be seen):

Image

Effect of cliponaxis: false:
Image

Lenguaje dominante
JavaScript
Estrellas
18.3k
Forks
2k
Merge medio
1 d 19 h
PR fusionados (30 d)
21

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