/**
* 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;
}
/**
* 绘制多边形，该多边形随地图状态变化
* @return 多边形对象
*/
public Graphic DrawPolygon()
{
double mLat = 39.93923;
double mLon = 116.357428;
int lat = (int)(mLat * 1E6);
int lon = (int)(mLon * 1E6);
GeoPoint pt1 = new GeoPoint(lat, lon);
mLat = 39.91923;
mLon = 116.327428;
lat = (int)(mLat * 1E6);
lon = (int)(mLon * 1E6);
GeoPoint pt2 = new GeoPoint(lat, lon);
mLat = 39.89923;
mLon = 116.347428;
lat = (int)(mLat * 1E6);
lon = (int)(mLon * 1E6);
GeoPoint pt3 = new GeoPoint(lat, lon);
mLat = 39.89923;
mLon = 116.367428;
lat = (int)(mLat * 1E6);
lon = (int)(mLon * 1E6);
GeoPoint pt4 = new GeoPoint(lat, lon);
mLat = 39.91923;
mLon = 116.387428;
lat = (int)(mLat * 1E6);
lon = (int)(mLon * 1E6);
GeoPoint pt5 = new GeoPoint(lat, lon);
//构建多边形
Geometry polygonGeometry = new Geometry();
//设置多边形坐标
GeoPoint[] polygonPoints = new GeoPoint[5];
polygonPoints[0] = pt1;
polygonPoints[1] = pt2;
polygonPoints[2] = pt3;
polygonPoints[3] = pt4;
polygonPoints[4] = pt5;
polygonGeometry.SetPolygon(polygonPoints);
//设置多边形样式
Symbol polygonSymbol = new Symbol();
Symbol.Color polygonColor = new Com.Baidu.Mapapi.Map.Symbol.Color(polygonSymbol);
polygonColor.Red = 0;
polygonColor.Green = 0;
polygonColor.Blue = 255;
polygonColor.Alpha = 126;
polygonSymbol.SetSurface(polygonColor, 1, 5);
//生成Graphic对象
Graphic polygonGraphic = new Graphic(polygonGeometry, polygonSymbol);
return polygonGraphic;
}