MarkerSymbolizer of MultiLine not orientated in line direction (Mapnik, Mapbox)

Question

What I want:

• drawing orientated arrows on one-directional streets

What I tried so far:

• MarkerSymbolizer: However, the arrows are all looking towards the "east" (right of the screen) instead of the direction of the MultiLineGeometry

Code:

<Rule>
  <LineSymbolizer />
  <MarkersSymbolizer marker-placement="line" file="arrow.png" width="1" />
</Rule>

The data which is rendered here is a MultiLineString.

UPDATE:

The only thing which I am missing right now in my solution posted below (using LinePatternSymbolizer) is that I cannot define spacing and max-error etc like here. Does anyone know if this is possible?

Answer 1

I found the solution to my own question:

Replace the MarkersSymbolizer with LinePatternSymbolizer, see below:

<Rule>
  <MaxScaleDenominator>250</MaxScaleDenominator>
  <LineSymbolizer stroke="#0000ff" stroke-width="84" stroke-linejoin="bevel" stroke-linecap="butt" stroke-opacity="0.5" smooth="1.0" />
  <LinePatternSymbolizer file="arrow.png" width="84" />
</Rule>

see Documentation

A workaround for the missing spacing attribute in LinePatternSymbolizer is so far to adjust the arrow.png image accordingly, e.g. more Spacing around the arrow in the image for a less frequent pattern.