LineStyle.dashOffset doesn't have any effect (is ignored in implementation)

[hoelzro]

I was playing with some code to try to create the "marching ants" effect with a line, but changing dashOffset on my line style doesn't appear to affect the way the line is drawn. Here's a minimal example that produces the issue:

import Color exposing (black)
import Graphics.Collage exposing (collage, dashed, segment, traced)
import Graphics.Element exposing (Element)

main : Element
main =
  let styleSansOffset = dashed black
      styleWithOffset = { styleSansOffset | dashOffset = 8 }

      lineSansOffset = traced styleSansOffset <| segment (0, 0) (100, 100)
      lineWithOffset = traced styleWithOffset <| segment (0, 10) (100, 110)

  in collage 300 300 [ lineSansOffset, lineWithOffset ]

and its output:

[jvoigtlaender]

Indeed, dashOffset is completely ignored in Native/Graphics/Collage.js. In fact, the dashOffset field is never accessed in the whole core code base. It might as well not exist.

Clearly an unsupported feature at the moment. Might make sense to remove it from the LineStyle type.

[jvoigtlaender]

Indeed, dashOffset is completely ignored in Native/Graphics/Collage.js. In fact, the dashOffset field is never accessed in the whole core code base. It might as well not exist.

Clearly an unsupported feature at the moment. Might make sense to remove it from the LineStyle type.