codeant-ai-for-open-source[bot] commented on PR #38035:
URL: https://github.com/apache/superset/pull/38035#issuecomment-4039000961
## **Sequence Diagram**
This PR modernizes deck.gl and point-cluster map charts so they can render
on either MapLibre (no key) or Mapbox (API key), handling query results,
clustering, and drawing overlays on the chosen map renderer.
```mermaid
sequenceDiagram
participant User
participant Frontend
participant Backend
participant MapChart
participant MapRenderer
User->>Frontend: Open dashboard or Explore with map chart
Frontend->>Backend: Request chart data with form data (including map
renderer and style)
Backend-->>Frontend: Return query rows with longitude, latitude, and
metrics
Frontend->>MapChart: Transform data into features, bounds and (for
clusters) Supercluster index
MapChart->>MapRenderer: Initialize MapLibre or Mapbox with selected base
style
MapRenderer-->>MapChart: Emit viewport changes (center, zoom, bounds)
MapChart->>MapChart: Compute deck layers or clusters for current viewport
MapChart->>MapRenderer: Draw overlays (deck.gl layers or canvas scatter)
on top of base map
```
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