Data types for 2d sprite packing tool

gistfile1.nim

type
  DataEntry* = object
    k:string # key
    v:int # value
  Rect* = object
    x:int
    y:int
    w:int # width
    h:int # height
    d:seq[DataEntry] # metadata
  AssetGroup* = ref object
    rect:Rect # describes surface that assets are packed on
    name:string
    counter:int # start point for auto-incrementing ids
  Asset* = ref object
    p:Asset # previous version of asset
    i:int # asset id
    g:AssetGroup # group association
    r:seq[Rect] # rectangles: 1st is boundary. 
                # additional are metadata, relative to top-left.