I'm not absolutely sure if I've understood your problem, so here's what I
think you want to do:
You have an marker-icon that is shifted some pixels (!) away from the actual
location you want to point at. When the user clicks on the marker, a line
from your anchor to the actual location shall be drawn. Is this correct?
If this would be the case, I have implemented the following method:
/*
* Calculates the Latitude/Longitude per
* Pixel ratio based on the given zoom.
*
* If you want to speed up things, you might
* replace the formula by an array of constant
* LatLng values, as the ratio isn't depending
* on any factors but the map's scaling. If
* This should change in the future, you would have
* to adjust the formula either way.
*
* @param zoom The zoom value for which you want
* to know the conversion ratio from
* pixel to LatLng
*/
function getLatLngPerPixel(zoom) {
var lng = 360 / (256 * (Math.pow(2,zoom))); //256 is the Map Width (px)
on zoom = 0
var lat = 2 * lng / Math.PI;
return new google.maps.LatLng(lat, lng);
}
This method gives you the "size" of a pixel in Latitude/Longitude
coordinates for a specific map zoom (by the way, you could also fill this
method with a static array containing the precalculated values for each
zoom). Now if you want to draw a line from your location to the anchor, just
get the conversion ratio, take your location as point A of the line, then
calculate point B of the line by multiplying your x/y values with the
corresponding conversion ratio and adding this to the coordinates of your
point A.
--
You received this message because you are subscribed to the Google Groups
"Google Maps JavaScript API v3" 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-js-api-v3?hl=en.
