| From | Sent On | Attachments |
|---|---|---|
| atpco81 | Oct 6, 2008 8:21 am | |
| Eric Ayers | Oct 6, 2008 10:07 am | |
| atpco81 | Oct 7, 2008 1:12 am |
| Subject: | Re: draw circle without GWT (radius known) | |
|---|---|---|
| From: | Eric Ayers (zun...@google.com) | |
| Date: | Oct 6, 2008 10:07:25 am | |
| List: | com.googlegroups.google-web-toolkit | |
Hi Giorgio,
It doesn't look like you are using the Google Web Toolkit (GWT),<http://code.google.com/webtoolkit>but straight JavaScript.
Searching the Maps group <http://groups.google.com/group/Google-Maps-API>might be of some help, but keep in mind that the Maps forum has some posting guidelines you should check out before posting a message there.
On Mon, Oct 6, 2008 at 11:21 AM, atpco81 <gpo...@gmail.com> wrote:
Hi all,
I'm a newbie and this could be a very simple question: How could I draw a circle in a maps if I know its center and radius?
I use JS and I do a circle using the distance from two different points as, but I want to use a function like this example: http://maps.forum.nu/gm_sensitive_circle2.html I have been trying to work with this function but it doesn't work!
function drawCircleFromRadius(){
if (circleLine) { map.removeOverlay(circleLine); } var bounds = new GLatLngBounds(); var circlePoints = Array(); centerPoint= center.getPoint(); map.setCenter(centerPoint);
with (Math) { circleRadius= (radius/1000); //km var d = circleRadius/6378.8; // radians var lat1 = (PI/180)* centerPoint.lat(); // radians var lng1 = (PI/180)* centerPoint.lng(); // radians
for (var a = 0 ; a < 361 ; a++ ) { var tc = (PI/180)*a; var y = asin(sin(lat1)*cos(d)+cos(lat1)*sin(d)*cos(tc)); var dlng = atan2(sin(tc)*sin(d)*cos(lat1),cos(d)-sin(lat1)*sin(y)); var x = ((lng1-dlng+PI) % (2*PI)) - PI ; // MOD function var point = new GLatLng(parseFloat(y*(180/PI)),parseFloat(x*(180/ PI))); circlePoints.push(point); bounds.extend(point); }
if (d < 1.5678565720686044) { circle = new GPolygon(circlePoints, '#000000', 2, 1, '#000000', 0.25); } else { circle = new GPolygon(circlePoints, '#000000', 2, 1); } map.addOverlay(circle);
map.setZoom(map.getBoundsZoomLevel(bounds)); } }
Is it a problem of Google API version(I use the v.2.x)? Have you got another examples ?
Cheers Giorgio
-- Eric Z. Ayers - GWT Team - Atlanta, GA USA http://code.google.com/webtoolkit/
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