Hi bizpo-
It seems to work for me. I uploaded my code here:
http://google-maps-api-for-flash.googlegroups.com/web/DebugFlashMapsPointInPoly.mxml?gsc=RRWQyxYAAAD3Hzn0FBZSEfFTrE2o08CK57an5Fe8QJeePd7zpGv9tg
- pamela
On Fri, Nov 21, 2008 at 12:00 PM, bizpo <[EMAIL PROTECTED]> wrote:
>
> This routine (see below) seems to work well for a 'directions'
> polyline with a high vertex count but seems to break with a simple
> poly line with 2. Am I doing something wrong? Thanks
>
> // Get the point X metres along the polyline, updating the step
> description
> private function getPointAtDistance(metres:Number):LatLng {
>
> if (metres == 0) return polyline.getVertex(0);
> if (metres < 0) return null;
> var dist:Number=0;
> var olddist:Number=0;
> for (var i:uint=1; (i < polyline.getVertexCount() && dist <
> metres); i++) {
> olddist = dist;
> dist +=
> polyline.getVertex(i).distanceFrom(polyline.getVertex
> (i-1));
> }
> if (dist < metres) {return null;}
> var p1:LatLng= polyline.getVertex(i-2);
> var p2:LatLng= polyline.getVertex(i-1);
> var m:Number = (metres-olddist)/(dist-olddist);
>
> // Use linear interpolation on the last bit
> return new LatLng(p1.lat() + (p2.lat()-p1.lat())*m,
> p1.lng() + (p2.lng()-p1.lng())*m);
> }
>
> On Nov 18, 5:55 pm, "pamela (Google Employee)" <[EMAIL PROTECTED]>
> wrote:
> > Hi bizpo-
> >
> > I believe that Mike William's EPoly extension for the JS API has a
> function
> > that will calculate this for you - GetPointAtDistance. You can convert
> this
> > function into AS3 for your own use. It may only work for non-geodesic
> > polylines, however; I haven't tested that myself. Here's the page for the
> > extension:http://econym.googlepages.com/epoly.htm
> >
> > - pamela
> >
> > On Wed, Nov 19, 2008 at 9:48 AM, bizpo <[EMAIL PROTECTED]> wrote:
> >
> > > How does one calculate the LatLng of points along a geodesic Polyline
> > > connecting two points. I'd like to move a marker along this smooth
> > > line that follows the curve of the earth. If that is not possible -
> > > how could you calculate it along a straight line connecting two
> > > points. Thank You.
> >
>
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