Vega-lite Deneb: How to make labels more readable on bubble chart

Anonymous — Tue, 25 Jul 2023 18:01:56 GMT

I have a bubble chart on Power BI that I made using the Deneb visual in Vega-lite. I am new to Vega-lite so I'm still learning. I want each bubble to have a label with the title for that row. However, I want to make it so the labels don't overlap if possible. Is there a way to make the labels not overlap? The labels also overlap the legend on the right. I was also thinking about filtering so that only larger bubbles have a label, but I'm not sure how to do that either.

Here is a screenshot showing how the labels overlap each other and the legend.

Here is my script with some dummy data to show the issue:

{ "$schema": "https://vega.github.io/schema/vega-lite/v5.json", "data": { "name": "dataset" }, "width": 950, "height": 400, "encoding": { "x": { "field": "Date", "type": "temporal", "axis": {"grid": false, "format":"Q%q %Y"} }, "y": { "field": "Prob", "type": "quantitative", "axis": {"title": "prob"} }, "tooltip" : [ {"field":"Title", "type": "nominal"}, {"field":"Group", "type": "nominal"}, {"field":"Section", "type": "nominal"}, {"field":"Amount", "type": "nominal"}, {"field":"ID#", "type":"nominal"}, {"field":"Description", "type":"nominal"} ] }, "layer":[{ "mark":{ "type": "circle", "opacity": 0.8, "stroke": "black", "strokeWidth": 1 }, "encoding": { "size": { "field": "Amount", "type": "quantitative", "title": "", "legend": "", "scale": {"rangeMax": 1000} }, "color": { "field": "Group", "type": "nominal" } } }, { "mark":{ "type": "circle", "opacity": 0.8, "stroke": "black", "strokeWidth": 1 }, "encoding": { "size": { "field": "Amount", "type": "quantitative", "title": "", "legend": "", "scale": {"rangeMax": 1000} }, "color": { "field": "Group", "type": "nominal" } } }, { "mark":{ "type": "text", "align": "left", "baseline": "top", "dx":8, "limit":150, "angle":-25 }, "encoding": { "text":{"field":"Title", "type":"nominal"} }, "transform": [ { "type": "label", "anchor": ["top", "bottom", "right", "left"], "offset": [1], "size": {"signal": "[width + 60, height]"} } ] } ] }

Re: Vega-lite Deneb: How to make labels more readable on bubble chart

dm-p — Tue, 25 Jun 2024 22:24:14 GMT

Hi @Anonymous,

It's not currently possible in Vega-Lite, but Vega has a label transform that can be used to avoid overlapping text marks. Porting this to Vega-Lite is on the roadmap, but the developers have no ETA at this time. If this is something you need, then you'll need to convert your specification to use Vega rather than Vega-Lite.

Regards,

Daniel

topic Re: Vega-lite Deneb: How to make labels more readable on bubble chart in Custom Visuals Development Discussion

Vega-lite Deneb: How to make labels more readable on bubble chart

Re: Vega-lite Deneb: How to make labels more readable on bubble chart