Dear Larry,
I have actually stream down the codes to only one
circle. Below is the codes.
function createPolygon(polygon, html) {
var infoHtml = html;
polys.push(polygon);
GEvent.addListener(polygon, "click", function(overlaylatlng) {
if(overlaylatlng){
map.openInfoWindow(overlaylatlng, infoHtml);
}
});
}
function drawCircle(point, radius, map) {
var d2r = Math.PI / 180; // degrees to radians
var r2d = 180 / Math.PI; // radians to degrees
var earthsradius = 3963; // 3963 is the radius of the earth in miles
var points = 64;
// find the raidus in lat/lon
var rlat = (radius / earthsradius) * r2d;
var rlng = rlat / Math.cos(point.lat() * d2r);
var extp = new Array();
for (var i=0; i < points+1; i++) // one extra here makes sure we connect
the
{
var theta = Math.PI * (i / (points/2));
ex = point.lng() + (rlng * Math.cos(theta)); // center a + radius x *
cos(theta)
ey = point.lat() + (rlat * Math.sin(theta)); // center b + radius y *
sin(theta)
extp.push(new GPoint(ex, ey));
}
return extp;
}
// Display the map, with some controls and set the initial location
var map = new GMap2(document.getElementById("map"));
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(0,0),8);
var color =["#000000", "#800000","#F00000", "#008000", "#00F000",
"#000080", "#0000F0","#808000", "#F0F000", "#008080"];
for (var i=1; i < 2; i++) {
createPolygon(new GPolygon(drawCircle(new GLatLng(0,0), (10-i)*10,
map), color[i], 10,i/10, color[i], i/10), "polygon "+ i);
map.addOverlay(polys[polys.length-1]);
}
On Sun, Aug 22, 2010 at 10:57 PM, [email protected] <[email protected]
> wrote:
> On Aug 22, 7:13 am, ss ss <[email protected]> wrote:
> > Dear Larry,
> > How about version 3 can I use is it?
>
> Sure.
>
> > How to use it?
>
> Just like v2, read the documentation, just be wary, it is similar to
> v2 but not the same.
>
> > Ok in that example I notice there is two line one is inside the thick one
> > how to avoid it.
>
> I'm not sure what you mean by that. The arguments of the polygon
> constructor are documented. Where is your map that shows the behavior
> that you don't want and what have you tried to fix it?
>
> -- Larry
>
> > Below is the code
> > createPolygon(new GPolygon(drawCircle(new GLatLng(0,0), (10-i)*10, map),
> > color[i], 10,i/10, color[i], i/10), "polygon "+ i);
> >
> > Ok about the second question for now to know the lat long I will split
> the
> > string for e.g. POINT(103.92508506774902 1.461838406932495). So I am
> > wondering is there any other better method? Thank you.
> >
> > On Sun, Aug 22, 2010 at 9:36 PM, [email protected]
> > <[email protected]>wrote:
> >
> > > On Aug 22, 3:05 am, ss <[email protected]> wrote:
> > > > Dear All,
> > > > I can read this value from my database for a circle geo
> > > > fence. Thus I also have a radius value. What is the best method to
> > > > draw a perfect circle as I have gone to this sitehttp://
> > >www.geocodezip.com/overlappingPolygons.aspbutthe curve is not
> > > > smooth?
> >
> > > In v2 you can't really draw a "perfect circle", the approximation used
> > > in that page is a 32 sided polygon:
> > > var points = 32;
> >
> > > The more points, the closer to a circle it will be, but the more time
> > > it will take to draw.
> >
> > > > Any idea the format I am reading is for
> > > > e.g.POINT(103.92508506774902 1.461838406932495).
> >
> > > That shouldn't have anything to do with the circle. Or is this a
> > > second question?
> >
> > > -- Larry
> >
> > > --
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