Function elbowSet

Get an elbow set by name.

You can mix and match sets. For example if you need a set of elbows for a box where all borders are thin lines except the bottom which is a thick line, you could:

import {Draw} from 'effect-tree'

const myElbowSet: Draw.ElbowSet = {
  ...Struct.pick(Draw.elbowSet('thin'), ...Draw.topElbows),
  ...Struct.pick(Draw.elbowSet('hThick'), ...Draw.bottomElbows),
}
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And your elbows will be thin, except for the bottom:

   topLeft ┌ ┐ topRight

bottomLeft ┕ ┙ bottomRight
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