Function getHeddle

getHeddle(d: Drawdown, i: number, j: number): null | boolean
get the value of the heddle at a given location
Parameters
- d: Drawdown
  the drawdown
- i: number
  the weft row
- j: number
  the warp col
Returns null | boolean
the heddle value (true, false or null for unset)
- Defined in draft/draft.ts:300