Google Maps Polygon to WKT

Question

I need to convert a Google Maps polygon object (can has multi paths and holes) to wkt string (multipolygon) at client. Then i'll able to save polygon as geography in Sql Server 2012.

I tried Wicket (https://github.com/arthur-e/Wicket) but it has a bug converting multipolygons.

Is there any ready to use library? Any ideas, please?

Thanks.

Answer 1

I just enabled multipolygon support (Arrays of google.maps.Polygon instances) in Wicket, version 1.0. Clone the "master" branch or download the 1.0 release.

Answer 2

If you can iterate the rings and holes you can do this yourself. Format is pretty simple. Pseudocode:

emit 'MULTIPOLYGON('

for each ring

  if it's not the first ring emit ','

  emit '(' 

  emit '('


    for each point in ring
     if it's not the first point emit ','

     emit X

     emit ' '

     emit Y

     end point loop
  emit ')'


  for each hole in ring

   emit ',('

     for each point in hole

      if it's not the first point emit ','

      emit X

      emit ' '

      emit Y

   end point loop

  emit ')'

  end hole loop

emit ')'

end ring loop

emit ')'