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Mermaid.js and GraphViz Diagram Renderers

Module

Web

Status

IMPLEMENTED

Description

Reusable diagram rendering components - Mermaid.js renderer for flowcharts/sequence diagrams with theme support, and GraphViz DOT renderer using WASM (@viz-js/viz) for graph visualizations with multiple engine support (dot, neato, fdp, etc.).

Implementation Details

  • Feature directory: src/Web/StellaOps.Web/src/app/shared/components/visualization/
  • Components:
    • graphviz-renderer (src/Web/StellaOps.Web/src/app/shared/components/visualization/graphviz-renderer.component.ts)
    • mermaid-renderer (src/Web/StellaOps.Web/src/app/shared/components/visualization/mermaid-renderer.component.ts)
  • Source: Feature matrix scan

E2E Test Plan

  • Setup:
    • Log in with a user that has appropriate permissions
    • Navigate to the relevant page/section where this feature appears
    • Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
  • Core verification:
    • Verify the visualization renders correctly with sample data
    • Verify interactive elements (hover tooltips, click-to-drill-down) work
    • Verify the visualization handles empty/minimal data gracefully
  • Edge cases:
    • Verify graceful handling when backend API is unavailable (error state)
    • Verify responsive layout at different viewport sizes
    • Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)