Hi,
I am trying to get started using http://econym.googlepages.com/eshapes.htm.
1) Does anyone know which algorithm is being used to draw the shapes?
2) My problem is that the function definition has the following
signature
GPolygon.Shape = function(point,r1,r2,r3,r4,rotation,vertexCount,
strokeColour,strokeWeight,Strokepacity,fillColour,fillOpacity,opts,tilt)
where r1, r2, r3 & r4 are in meters but I do not have any clue about
what they really represent! I know that point is the center GLatLng
object and I understand the rest parameters. My problem is that I want
to calculate the r1, r2, r3 & r4 parameters dynamically from GLatLng
objects which I use.
So firstly, I must understand what they represent in order to perform
any calculation.
Any help will be appreciated.
Thanks in advance
Nikos
p.s. If someone can help me I provide the full code snippet:
GPolygon.Shape = function(point,r1,r2,r3,r4,rotation,vertexCount,
strokeColour,strokeWeight,Strokepacity,fillColour,fillOpacity,opts,tilt)
{
var rot = -rotation*Math.PI/180;
var points = [];
var latConv = point.distanceFrom(new GLatLng(point.lat()
+0.1,point.lng()))*10;
var lngConv = point.distanceFrom(new
GLatLng(point.lat(),point.lng()+0.1))*10;
var step = (360/vertexCount)||10;
var flop = -1;
if (tilt) {
var I1=180/vertexCount;
} else {
var I1=0;
}
for(var i=I1; i<=360.001+I1; i+=step) {
var r1a = flop?r1:r3;
var r2a = flop?r2:r4;
flop = -1-flop;
var y = r1a * Math.cos(i * Math.PI/180);
var x = r2a * Math.sin(i * Math.PI/180);
var lng = (x*Math.cos(rot)-y*Math.sin(rot))/lngConv;
var lat = (y*Math.cos(rot)+x*Math.sin(rot))/latConv;
points.push(new GLatLng(point.lat()+lat,point.lng()+lng));
}
return (new
GPolygon(points,strokeColour,strokeWeight,Strokepacity,fillColour,fillOpacity,opts))
}
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