本章节将对绘制弧线、绘制圆以及多边形进行说明。

弧线由Arc类定义，一条弧线由起点、中点和终点三个点确定位置。

示例代码如下：

/// 坐标点
List<BMFCoordinate> coordinates = List(3);
coordinates[0] = BMFCoordinate(40.065, 116.224);
coordinates[1] = BMFCoordinate(40.125, 116.404);
coordinates[2] = BMFCoordinate(40.065, 116.504);

/// 构造ArcLine
BMFArcline arcline = BMFArcline(
        coordinates: coordinates,
        lineDashType: BMFLineDashType.LineDashTypeNone,
        width: 6,
        color: Colors.blue);

/// 添加arcLine
myMapController?.addArcline(arcline);

绘制效果如图：

圆由BMFCircle类定义，开发者可以通过BMFCircle类设置圆心位置、半径(米)、边框以及填充颜色。

示例代码如下：

/// 构造圆
BMFCircle circle = BMFCircle(
        center: BMFCoordinate(40.048, 116.404),
        radius: 5000,
        width: 6,
        strokeColor: Colors.green,
        fillColor: Colors.amber,
        lineDashType: BMFLineDashType.LineDashTypeSquare);

/// 添加圆
myMapController?.addCircle(circle)

绘制效果如图：

实例代码如下：

  // 多边形镂空图形：
  List<BMFHollowShape> hollowShapes = []; // 图形数据模型 
  List<BMFCoordinate> coordinates = List(4);// 经纬度数据 
 
  coordinates[0] = BMFCoordinate(40.055056, 116.309102); 
  coordinates[1] = BMFCoordinate(40.055056, 116.307102); 
  coordinates[2] = BMFCoordinate(40.057056, 116.307102); 
  coordinates[3] = BMFCoordinate(40.057056, 116.309102); 
 
  BMFHollowShape polygonHollowShape = 
    BMFHollowShape.polygon(coordinates: coordinates); 
  hollowShapes.add(polygonHollowShape); 
 
  _circle0.updateHollowShapes(hollowShapes);

  // 圆形镂空图形
  List<BMFHollowShape> hollowShapes = [];// 图形数据模型 
  BMFHollowShape circleHollowShape = 
    BMFHollowShape.circle(center: _circle0.center, radius: 100); 
  hollowShapes.add(circleHollowShape); 
  _circle0.updateHollowShapes(hollowShapes);

显示的效果如下：

circle更新接口

多边形由BMFPolygon类定义。开发者可以通过BMFPolygon来设置多边形的位置、边框和填充颜色。一个多边形是一组Latlng点按照传入顺序连接而成的封闭图形。

示例代码如下：

/// 坐标点
List<BMFCoordinate> coordinates = List(5);
    coordinates[0] = BMFCoordinate(39.965, 116.204);
    coordinates[1] = BMFCoordinate(39.865, 116.204);
    coordinates[2] = BMFCoordinate(39.865, 116.304);
    coordinates[3] = BMFCoordinate(39.905, 116.254);
    coordinates[4] = BMFCoordinate(39.965, 116.304);

/// 构造Polygon
BMFPolygon polygon = BMFPolygon(
        coordinates: coordinates,
        strokeColor: Colors.blue, 
        width: 4, 
        fillColor: Colors.brown);

/// 添加polygon
myMapController?.addPolygon(polygon);

绘制效果如图：

示例代码如下：

  // 多边形镂空图形：
  List<BMFHollowShape> hollowShapes1 = []; // 图形数据模型 
  List<BMFCoordinate> coordinates1 = List(5); 
  coordinates1[0] = BMFCoordinate(39.925, 116.525); 
  coordinates1[1] = BMFCoordinate(39.885, 116.525); 
  coordinates1[2] = BMFCoordinate(39.885, 116.575); 
  coordinates1[3] = BMFCoordinate(39.925, 116.575); 
  coordinates1[4] = BMFCoordinate(39.945, 116.550); 
 
  BMFHollowShape polygonHollowShape1 = 
    BMFHollowShape.polygon(coordinates: coordinates1); 
  hollowShapes1.add(polygonHollowShape1); 
 
  _polygon1.updateHollowShapes(hollowShapes1); 

///圆形镂空图形： 
  BMFCoordinate center1 = BMFCoordinate(39.920, 116.550);// 中心点坐标 
  BMFHollowShape circleHollowShape1 = 
    BMFHollowShape.circle(center: center1, radius: 1500); 
  hollowShapes1.add(circleHollowShape1); 
  _polygon1.updateHollowShapes(hollowShapes1);

显示的效果如下：

polygon更新接口