arcgis engine 道路接边的代码

实现道路接边的方法有很多种，这里提供其中一种思路和代码示例：

1. 获取道路线要素的几何对象 Geometry
2. 根据要素几何对象 Geometry 获取其两侧的点集合
3. 根据两侧点集合计算道路边缘的点集合
4. 根据点集合生成道路边缘的线要素，并添加到图层中

以下是示例代码：

//获取道路线要素的几何对象
IFeature roadFeature = ...;
IGeometry roadGeometry = roadFeature.ShapeCopy;

//获取道路线要素两侧的点集合
IPointCollection leftPoints = new PolylineClass();
IPointCollection rightPoints = new PolylineClass();
GetSidePoints(roadGeometry as IPolyline, 5, ref leftPoints, ref rightPoints); //这里以5米为例，获取道路左右两侧5米内的点集合

//计算道路边缘的点集合
IPointCollection edgePoints = new PolylineClass();
CalculateEdgePoints(leftPoints, rightPoints, 1, ref edgePoints); //这里以1米为例，计算道路边缘每1米的点集合

//生成道路边缘的线要素，并添加到图层中
IFeatureClass edgeFeatureClass = ...; //道路边缘线要素类
ILineSymbol edgeSymbol = ...; //道路边缘线符号
IFeature edgeFeature = edgeFeatureClass.CreateFeature();
IPolyline edgePolyline = new PolylineClass();
for (int i = 0; i < edgePoints.PointCount - 1; i++)
{
    edgePolyline.FromPoint = edgePoints.get_Point(i);
    edgePolyline.ToPoint = edgePoints.get_Point(i + 1);
    edgeFeature.Shape = edgePolyline;
    edgeFeature.Store();
    DrawLine(edgePolyline, edgeSymbol); //绘制道路边缘线
}

其中，GetSidePoints() 方法用于获取道路线要素两侧的点集合，CalculateEdgePoints() 方法用于计算道路边缘的点集合，DrawLine() 方法用于绘制道路边缘线。这些方法需要根据实际需求进行实现。