Detailed orientation change in instructions

Open Source Routing Engine
1

Hi,

I’m trying to understand how the instructions where produced. I want to return every single changing in direction in every curve of a way to the user within the instructions. This could be interesting for blind or visually impaired users. E.g. with this [1] description a blind user would, in best case, just walk 180m along the path he is currently on.
I haven’t found it in the code right now, but I think this is due to simplification, right? If someone can point me to the right place in the code, so that I can change the instructions to my intended level of detail, I would be really thankful.

Best Regards,
Philipp

[1] https://graphhopper.com/maps/?point=51.031375,13.743719&point=51.030606,13.742759&locale=en-US&vehicle=foot&weighting=fastest&elevation=true&layer=OpenStreetMap

2

We currently decide to create instructions only when properties of the edges change, this is too simplistic and needs improvement (see the various issues on github). See the code in Path.calcInstructions

3

The instructions are calculated in Path class.

See from line 552 for the turns calculation.

Emux