Lots of everything including the kitchen sink. Shows multiple axes using the clone method and both square and radial grids. As new enties are created, they're likely to be added to this page.
Events here are turned off by default. Objects register a handler for hits (click events) and/or select (enter/over/out) with the base schematic, which dispatches events as they occur. Callbacks (with a simple reference counter) are used to make sure images are loaded before rendering. Greyscale is an expensive image-based operation intended to be used one-time prior to rendering to a static representation. The deubg window also shows some text measurement calculations, used to size bounding boxes, set offsets, etc.