twpayne/go-polyline

I can't decode a polyline

roskee opened this issue · 1 comments

roskee commented

I don't know what the problem is but decoding the following polyline string generates an ErrEmpty. I tested the polyline on google and it has many points.

polylineStr := "u@g~xkF????CHOf@ETI`Qx@GXKb@CLu@vBk@rAw@lBiAdEcAdDc@vAc@rAKGIGMGKIMIMEO@K@O@sAs@aAa@"

c, _, err := poyline.DecodeCoords([]byte(polylineStr))
// err is ErrEmpty
twpayne commented

This polyline has an odd number of elements, meaning that the final coordinate is not complete. If you paste it into https://developers.google.com/maps/documentation/utilities/polylineutility you will see that, after you click "Decode Polyline", the page adds an extra @@ at the end of the string to correct it. This library only encodes and decodes polylines. It does not correct them.

tl;dr this polyline is not valid.

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