Hi.
I have an existing GLatLng , and a distance, and I want to set a new
point. I'm using an algorithm I found at
http://www.movable-type.co.uk/scripts/latlong.html,
but I cannot get it to work, i've tried different variations of it all
day, but I can't get it to work. This is my current effort:
var R = 6371;
var radius = document.getElementById("radius").value;
var d=parseFloat(radius);
var lat1 = point1.lat() * Math.PI / 180;
var lon1 = point1.lng() * Math.PI / 180;
var brng = 60 * Math.PI / 180;
var lat2 = Math.asin( Math.sin(lat1)*Math.cos(d/R) +
Math.cos(lat1)*Math.sin(d/R)*Math.cos
(brng) );
var lon2 = lon1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos
(lat1),
Math.cos(d/R)-Math.sin(lat1)
*Math.sin(lat2));
lon2 = (lon2+Math.PI)%(2*Math.PI) - Math.PI;
if (!isNaN(lat2) || !isNaN(lon2)){
marker2.setLatLng(new GLatLng(lat2,lon2));
point2 = marker2.getLatLng();
drawCircle(point1, point2, fillColour, fillColour);
}
The site can be found here:
http://22.latest.mapcircle.appspot.com/
(First pick to points, then change the radius to see the code in
action)
Any help really apreaciated.
Thanks!
Odd-R.
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