GoogleMap中擴充圖形的畫法

最近在幫一個朋友在GoogleMap上畫扇形，GoogleMap本身不提供這種畫法，所以需要自己去實現，無賴原來學過的數學也忘記的差不多了，只能求助網路。

國外有一個高手寫了一個擴充，地址是：http://econym.org.uk/gmap/eshapes.htm

但裡面沒有扇形的畫法，在此基礎上自己增加了扇形的畫法：

GPolyline擴充方法：

 1 GPolyline.Sector = function(point, radius, sDegree, eDegree, colour, weight, opacity,opts) {
 2     var points = [];
 3     var step = ((eDegree - sDegree) / 10) || 10;
 4         
 5     points.push(point);
 6     for(var i=sDegree;i<eDegree + 0.001;i+=step){
 7         points.push(EOffsetBearing(point,radius,i));                                  
 8     }
 9     points.push(point);
10         
11     return new GPolyline(points, colour, weight, opacity, opts);
12 }

GPolygon擴充方法：

 1 GPolygon.Sector = function(point, radius, sDegree, eDegree, strokeColour, strokeWeight,Strokepacity, fillColour, fillOpacity, opts) {
 2         var points = [];
 3         var step = ((eDegree - sDegree) / 10) || 10;
 4         
 5         points.push(point);
 6         for(var i=sDegree;i<eDegree + 0.001;i+=step){
 7             points.push(EOffsetBearing(point,radius,i));                                  
 8         }
 9         points.push(point);
10         
11         return new GPolygon(points, strokeColour, strokeWeight,Strokepacity, fillColour, fillOpacity, opts);
12     }

使用方法見Demo，是：http://files.cnblogs.com/liongis/eshapes.rar