It's nearly impossible for us to help with server side code... You didnt even mention what language you use!
We have no knowledge of your OracleDataReader, does that return data in a format compatible with your inPolygon function. Also what exact error did you get? Can you offload the point-in-polygon test to your Oracle Database? (at a guess that is what you are using...) For javascript see http://econym.org.uk/gmap/epoly.htm On 04/05/2009, nive <[email protected]> wrote: > > HI, > > > How to determine if a point is within a polygon. > > I wrote this function > > > Private Function inPolygon(ByVal pA As Double(,), ByVal x As Double, > ByVal y As Double) As Boolean > > '-------------------------------------------------------------------' > 'Point inclusion in polygon test > 'Makes use of the ray-casting algorithim (based on the Jordan > Curve > 'Theorem) to determine if a point is within a polygon. > 'Taken from W Randolph Franklin, > 'http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/ > pnpoly.html > > '-------------------------------------------------------------------' > > Dim i As Integer = 0 > Dim j As Integer = 0 > Dim c As Boolean = False > > j = pA.GetUpperBound(0) > > For i = 0 To pA.GetUpperBound(0) > If ((((pA(i, 1) <= y) And (y < pA(j, 1))) Or ((pA(j, 1) <= > y) And (y < pA(i, 1)))) _ > And (x < (pA(j, 0) - pA(i, 0)) * (y - pA(i, 1)) / (pA(j, > 1) - pA(i, 1)) + pA(i, 0))) Then > c = Not c > End If > j = i > Next > > Return c > > End Function > > > > > > I need to use this function where i am pulling the points from the > databse.I am getting error, can anybody tell me how to do this > > > I was using like this, i am not sure if this is correct wa of doing > or not > > > Dim dr As OracleClient.OracleDataReader = cmd.ExecuteReader > If dr.HasRows Then > xml = "<?xml version=""1.0"" encoding=""iso-8859-1"" ? > >" + vbNewLine > xml += "<markers>" + vbNewLine > While dr.Read() > 'If inPolygon(PollyArray(longitude, latitude), dr > ("longitude"), dr("latitude")) Then > xml += "<marker" > > > Thanks > Nive > > > > > > > -- Barry - www.nearby.org.uk - www.geograph.org.uk - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
