A generic quadtree for storing rectangles, points, and segments with intersection/containment queries, dynamic subtree growth/splitting/merging, and edge-case handling for zero-width/height objects. It is nearly self-contained and can be lifted into any spatial-indexing use case outside GoJS, demonstrating careful tree-balancing and query-optimization craft.

A data-agnostic packing layout that operates on an IBounded interface instead of go.Node, making it usable for arbitrary bounded objects. It implements Wang et al. circle packing, the Matousek-Sharir-Welzl smallest-enclosing-circle algorithm, segment-based perimeter rectangle packing with quadtree collision detection, and skip-fit optimization between non-sequential segments. This is a strong, extensible algorithm module for geometric layout problems.

Computes a scalar intensity field over a viewport using exact Manhattan or chamfer-based approximate Euclidean distance transforms, then renders it through cached Float32Array and ImageData buffers with only changed regions uploaded. The design avoids per-frame allocations and can be adapted to any canvas-based overlay or raster heat-map feature, not just GoJS diagrams.

A sophisticated swimlane graph layout with orthogonal link routing. It uses Tarjan's strongly-connected-components algorithm to isolate cycle blocks, exhaustive branch-and-bound search with admissible pruning for small blocked subgraphs, occupancy-grid placement, and route-shape evaluation for corridors and ports. While GoJS-coupled, it is a drop-in diagram layout that shows exceptional algorithm organization and heuristic tuning.

Builds a live HTML table inspector for GoJS model data, with declarative property descriptors (type, choices, read-only, default value), multi-object union/intersection editing, and static predicates such as showIfNode/showIfLink. It is self-contained and uses a clean configuration-driven design that could serve as a generic model-data property editor in other diagramming or entity-editing applications.