Concise monthly summary for April 2026 focusing on the powsybl-network-viewer feature demo. Overall, delivered a targeted visualization improvement via a feature demo and established solid contribution practices to support ongoing development and onboarding.

Monthly summary for 2026-03 focusing on delivering business value through robust network visualization features, robust rendering fixes, and metadata-driven styling. Highlights include enhancements to the Network Diagram Viewer for clearer visuals and interactive fidelity, robust edge rendering fixes, NAD viewer improvements with adaptive zoom and middle-edge arrows, and metadata/styling improvements in NAD diagrams to support richer styling and easier maintenance.

February 2026: powsybl-network-viewer delivered two user-visible features to improve network visualization and data clarity, plus targeted fixes to enhance zoom-based element visibility. The changes enhance readability for large networks, provide structured voltage/angle metadata, and streamline the developer workflow, enabling faster analysis and onboarding for newNetwork designs.

January 2026 – Delivered key frontend visualization improvements in the powsybl-network-viewer with a focus on compatibility, stability, and maintainability. Implemented NAD viewer updates to align with powsybl-diagram v5.2.0 and enhanced the network area diagram's zoom behavior for a more accurate and responsive user experience. Impact highlights include improved rendering accuracy for transformer edges (including three-winding transformers), metadata-driven edge visibility, and more reliable node dragging. The AdaptiveTextZoom feature was strengthened by moving the visible-area computation to a reusable SVG utility, accompanied by unit tests and correct container sizing to ensure robust zoom across datasets. Top themes: compatibility with diagram updates, bugs fixed, test-driven improvements, and code refactoring for maintainability.

Concise monthly summary for 2025-12 focused on delivering business value and technical excellence for the powsybl-network-viewer project.

October 2025 Monthly Summary focusing on key accomplishments in SLD visualization work across two core repos. This period delivered substantial enhancements to Single Line Diagram styling and labeling, enabling granular, ID-based customization and richer visual information across diagram and Python bindings. No critical bugs fixed this month based on available data; maintenance items were addressed as part of feature work. Key outcomes: - Implemented a Custom Topological Style Provider for SLD in powsybl-diagram to enable granular styling of buses, nodes, and edges based on IDs or topology properties. - Expanded SLD customization in pypowsybl via the SldProfile, adding parameters for custom labels and feeder information, and introducing a styles property to control overall visual appearance. - Updated C++ and Python interfaces to support new SldProfile parameters and style information, ensuring end-to-end consistency across the stack. - Result: improved visualization fidelity, easier data-driven styling, and a better foundation for user-specific dashboards and reports. Technologies/skills demonstrated: - Cross-repo feature delivery and integration (Java, C++, Python bindings) - Extensible styling architecture and SLD customization patterns - Attention to UX details in network diagrams and labeling - Commit-level traceability and documentation alignment

September 2025 monthly summary for powsybl-network-viewer: Focused on stability and reliability improvements, primarily addressing an initialization order bug in NetworkAreaDiagramViewer. The change ensures that instance properties are set before the init method is invoked, preventing premature access and potential startup errors. This work reduces startup risk and contributes to a more robust network visualization experience for users.

July 2025 monthly performance summary for powsybl-diagram and pypowsybl. Key outcomes include delivering two high-value features: (1) Enhanced Single Line Diagram labeling via a custom label provider with new Java classes and unit tests, improving diagram clarity and label customization; (2) Default NadProfile with default labels and descriptions for network area diagrams, exposing defaults via C++, Java methods and Python bindings, with documentation updates. No major bugs fixed in this period. Overall impact: improved diagram readability, faster diagram authoring, and strengthened cross-language usability. Technologies/skills demonstrated: Java, C++, Python bindings, unit testing, multi-repo collaboration, and comprehensive documentation.

June 2025 monthly summary for powsybl-network-viewer: Delivered a focused UX uplift by enhancing map tooltip rendering to reduce occlusion and enabling custom tooltip content rendering via renderPopover. These changes improve the clarity of topology insights and contribute to faster decision-making for network engineers.

May 2025: Fixed right-click coordinate handling in powsybl-network-viewer by removing an unnecessary CTM assignment in onRightClickCallback, ensuring accurate position data and reliable context menu behavior. This UI correctness improvement was implemented in commit ffe829faa9732ee0a21bba050e90fc99bdc44068 with the message 'Fixes coordinates returned by onRightClickCallback (#198)'.

April 2025 performance summary: Focused on Network Area Diagram (NAD) visualization improvements and code-quality refactoring to centralize label rendering. Delivered new customization options for NadProfile, enabling detailed labeling and styling of network elements, and centralized SVG label validation in the diagram module to streamline SVG generation and remove legacy rendering modes. These changes improve diagram readability, reduce maintenance overhead, and improve consistency across visualization components, delivering business value for operators and planners.

March 2025 performance highlights focused on end-user visualization improvements and theming improvements across two repos (pypowsybl and powsybl-diagram).

February 2025 monthly summary for powsybl-network-viewer: No new features were shipped this month. A critical UI bug affecting Network Area Diagram (NAD) button rendering was fixed to ensure SVGs render correctly. The patch corrected the quoting of the SVG file path used in the CSS background-image, eliminating broken visuals and inconsistent button states across environments. This improves UI reliability, user trust, and reduces potential post-release support tickets. The fix is recorded in commit e19bfe451884d179337b0b54cdb2bc8961227de5 with message 'Fixes loading of SVGs, used as background images in NAD buttons (#171)'.

January 2025: Delivered a new API capability in pypowsybl to enhance network area diagram layouts by introducing fixed_positions for get_network_area_diagram. Users can supply a pandas DataFrame with exact coordinates for nodes and legend elements, overriding the default layout algorithm for precise, reproducible visuals. No major bugs reported in this area this month. Impact: clearer, more reliable diagrams for complex networks, enabling production-ready visuals for documentation and reporting. Technologies demonstrated: Python API extension, pandas DataFrame integration, and careful API design for optional advanced layout control (aligned with issue #928).

Monthly summary for 2024-11 focused on delivering a multi-language feature that enhances network area diagram visualization and metadata access, with concrete commit-level work and cross-language binding work across C++, Python, and Java. The work improves data fidelity, speeds up analytics pipelines, and reduces manual integration steps.