/**
* 绘制圆，该圆随地图状态变化
* @return 圆对象
*/
public Graphic DrawCircle()
{
double mLat = 39.90923;
double mLon = 116.447428;
int lat = (int)(mLat * 1E6);
int lon = (int)(mLon * 1E6);
GeoPoint pt1 = new GeoPoint(lat, lon);
//构建圆
Geometry circleGeometry = new Geometry();
//设置圆中心点坐标和半径
circleGeometry.SetCircle(pt1, 2500);
//设置样式
Symbol circleSymbol = new Symbol();
Symbol.Color circleColor = new Com.Baidu.Mapapi.Map.Symbol.Color(circleSymbol);
circleColor.Red = 0;
circleColor.Green = 255;
circleColor.Blue = 0;
circleColor.Alpha = 126;
circleSymbol.SetSurface(circleColor, 1, 3, new Com.Baidu.Mapapi.Map.Symbol.Stroke(3, new Com.Baidu.Mapapi.Map.Symbol.Color(circleSymbol, Android.Graphics.Color.ParseColor("#FFFF0000").ToArgb())));
//生成Graphic对象
Graphic circleGraphic = new Graphic(circleGeometry, circleSymbol);
return circleGraphic;
}
