Module marks 

Pure-image set-of-marks overlay.

Numbers every rectangle in boxes on a copy of source and draws a small filled label in the top-left of each rect. Numerals are rendered with an embedded 4x6 bitmap font so the module stays free of fontdue or any platform font APIs.

Structs

ImageRect

Rectangle in image pixels.

MarkBox

One rectangle plus its human-readable label.

Functions

draw_marks

Draw boxes on a copy of source and return the marked image.

marks_for_nodes

Numbered boxes for every node of root whose frame lands inside map.

ocr_label

Map an OCR observation (zero-based) to the oN label the protocol uses.

tree_label

Map an element index from the latest tree to its label.