putting markers on polylines

[fireofhellx]

right i have made a number of polylines but want to know how i would go about adding a marker to them every 10 meters?

ive been looking around and havent found anything that orks

[geoco...@gmail.com]

Does this help:
http://groups.google.com/group/google-maps-js-api-v3/browse_frm/thread/c03d2ea80174d26d/ef401a98d7334e44?lnk=gst&q=mile+markers+geocodezip#ef401a98d7334e44

-- Larry

[fireofhellx]

yes that is what i need but there is a lot going on in that script
do i just need to get the length of my polylines then put markers on
at a set distance i have found this for calculating the length

google.maps.LatLng.prototype.kmTo = function(a){
var e = Math, ra = e.PI/180;
var b = this.lat() * ra, c = a.lat() * ra, d = b - c;
var g = this.lng() * ra - a.lng() * ra;
var f = 2 * e.asin(e.sqrt(e.pow(e.sin(d/2), 2) + e.cos(b) *
e.cos(c) * e.pow(e.sin(g/2), 2)));
return f * 6378.137;
}





google.maps.Polyline.prototype.inKm = function(n){
var a = this.getPath(n), len = a.getLength(), dist = 0;
for(var i=0; i<len-1; i++){
dist += a.getAt(i).kmTo(a.getAt(i+1));
}
return dist;
}

but it dosent seem to work

On Apr 28, 5:28 pm, "geocode...@gmail.com" <geocode...@gmail.com>
wrote:

> On Apr 28, 9:23 am, fireofhellx <homem...@aol.com> wrote:
>
> > right i have made a number of polylines but want to know how i would go
> > about adding a marker to them every 10 meters?
> > ive been looking around and havent found anything that orks
>

> Does this help:http://groups.google.com/group/google-maps-js-api-v3/browse_frm/threa...
>
>   -- Larry

[Esa]

On Apr 28, 7:44 pm, fireofhellx <homem...@aol.com> wrote:
> yes that is what i need but there is a lot going on in that script
> do i just need to get the length of my polylines then put markers on
> at a set distance i have found this for calculating the length

> but it dosent seem to work

I been using those methods a lot and they work fine for me. The first
one calculates distance between two LatLng points. The second one
makes use of that and iterates through a polyline segments and returns
a cumulated length. Actually I wrote them but never documented them.

If you have a polyline called poly, you can test it by:

alert(poly.inKm());

By using those, you can create a 'milestone function'. See
getPointAtDistance() function in Mike Williams' v2 EPoly library.
http://econym.org.uk/gmap/epoly.htm

The polyline length is measured to the last vertex before milestone
and to the first vertex after milestone. The last part is calculated
by interpolation.

[Esa]

Actually you should use the geometry library functions that were
introduced to api recently
http://code.google.com/apis/maps/documentation/javascript/reference.html#spherical

Still you have to write the milestone function but geometry library
provides you interpolate() function to make it a little bit easier.

[fireofhellx]

ok thank you very much for your help its alot clearer what i need to do thanks

Danny

[Esa]

Ah, sorry. It took me this long to realize that Larry already ported
EPoly to v3.
http://www.geocodezip.com/scripts/v3_epoly.js

[fireofhellx]

ummm ive linked the epoly.js file (the updated one)but cant seem to get the functions to work?

my polyline is called roadpath

ive written var collectables = roadpatht.GetPointsAtDistance(5.00);

but it stops at this line 

[Esa]

That's a marker after each five meters.

[fireofhellx]

yeh i need to make markers a short distance apart prob more like 15 meters apart but i cant seem to get GetPointsAtDistance to work so im a bit stuck here is what i have

my polyline

var roadpath = new google.maps.Polyline({

    path:latlng,

     strokeColor: "#FF0000",

     strokeOpacity: 1.0,

        strokeWeight: 2

});

                                 roadpath.setMap(map);

var pathmark = roadpath.GetPointsAtDistance(15.00);

then i need to use the value of pathmark to place my markers right?

however my script stops when it hits var pathmark = roadpath.GetPointsAtDistance(15.00); and im not sure why any suggestion?

[geoco...@gmail.com]

On Apr 29, 8:58 am, fireofhellx <homem...@aol.com> wrote:
> yeh i need to make markers a short distance apart prob more like 15 meters
> apart but i cant seem to get GetPointsAtDistance to work so im a bit stuck
> here is what i have

It works for me. If you post a link to your map that exhibits the
problem, and time permits, I will take a look and see if I can see
what you are doing differently.

-- Larry

[fireofhellx]

ok ty from line 341 and below is the polyline stuff 

http://dannyw.instantfreesite.net/game.html

i think u may have looked my site before for a different question a week or so back

[geoco...@gmail.com]

On Apr 29, 9:14 am, fireofhellx <homem...@aol.com> wrote:
> ok ty from line 341 and below is the polyline stuffhttp://dannyw.instantfreesite.net/game.html

> i think u may have looked my site before for a different question a week or
> so back

And this is still true:
http://groups.google.com/group/google-maps-js-api-v3/msg/1cb5b623947d56a9

Your map doesn't work for me. I don't see any polylines, makes it
hard to help on your problem.

-- Larry

[fireofhellx]

ok that odd you need to let it use your location because thats how i have designed it 

if u let it use your position you should see the polyline 

i know my code is a mess this is the first big project ive done using javascript in this manor 

[Rossko]

> ok that odd you need to let it use your location because thats how i have
> designed it

That's up to you of course, but your website will not be useable by
people who don't behave the way you tell them.

The problem I can actually see is that you are trying to extend the
Google Maps API with the epoly extension before the API has been
loaded. Load the API before epoly script.

[fireofhellx]

ah i see thank you very much for your help

just to note this project is a university project into the nature of user interaction with mobile apps, and to what extent a user is willing to physically interact within the really world to play within a virtual one, hence the location tracking and the nature of my design 

thank you for your help

[fireofhellx]

this may seem like a silly question but when dose the API finish loading? because i can get markers and polylines to show i thought once you had made the map the api was loaded ?

[Rossko]

> this may seem like a silly question but when dose the API finish loading?

It's not about that, it's about
<script src="javascript/v3_epoly.js" type="text/javascript"></
script>
<script type="text/javascript" src="http://maps.google.com/maps/api/
js?sensor=true"></script>
you can't add an API extension before you have even requested the API
to be extended

> because i can get markers and polylines to show

I can't

[fireofhellx]

oh right i see what u mean sorry im still very new to this 

[fireofhellx]

ty very much it was the fact i have the ve epoly loading before the api works perfect now you have been a big help