IPoint IntersectPointExtendedTo(IPolyline pPolyline, IPolygon pCirclePoly)
{
ICurve pCurve;
ILine pLine;
IPolyline pPLine;
ITopologicalOperator pTopoOpt;
IGeometryCollection pGeoCol;
pCurve = pPolyline;
pLine = new Line();
double gridWidth = _mapTemplate.Width * _scale / 100.0;
pCurve.QueryTangent(esriSegmentExtension.esriExtendTangentAtTo, 1, true, gridWidth * 1.1, pLine);
pPLine = new Polyline() as IPolyline;
IPointCollection pPnts = pPLine as IPointCollection;
IClone pClone = pLine.FromPoint as IClone;
pPnts.AddPoint(pClone.Clone() as IPoint);
pClone = pLine.ToPoint as IClone;
pPnts.AddPoint(pClone.Clone() as IPoint);
pTopoOpt = pPLine as ITopologicalOperator;
pGeoCol = new GeometryBag() as IGeometryCollection;
pGeoCol =
pTopoOpt.Intersect(pCirclePoly, esriGeometryDimension.esriGeometry0Dimension) as IGeometryCollection;
if (pGeoCol.GeometryCount == 0)
{
return(null);
}
return(pGeoCol.Geometry[0] as IPoint);
}
private static void QueryTangent([NotNull] IPolyline polyline,
double distanceAlong,
[NotNull] ILine templateLine)
{
const bool asRatio = true;
const double length = 1.0;
polyline.QueryTangent(esriSegmentExtension.esriNoExtension, distanceAlong,
asRatio, length, templateLine);
}
private double GetAngle(IPolyline pPolyline)
{
//IPolycurve pPolycurve;
ILine pTangentLine = new ESRI.ArcGIS.Geometry.Line();
pPolyline.QueryTangent(esriSegmentExtension.esriNoExtension, 0.5, true, pPolyline.Length, pTangentLine);
Double radian = pTangentLine.Angle;
//Double angle = radian * 180 / Math.PI;
//// 如果要设置正角度执行以下方法
//while (angle < 0)
//{
// angle = angle + 360;
//}
//// 返回角度
//return angle;
// 返回弧度
return radian;
}
/// <summary>
/// 获取线的角度（弧度）
/// </summary>
/// <params name="pPolyline">线</params>
/// <returns></returns>
private static double GetAngle(IPolyline pPolyline)
{
//IPolycurve pPolycurve;
ILine pTangentLine = new Line();
pPolyline.QueryTangent(esriSegmentExtension.esriNoExtension, 0.5, true, pPolyline.Length, pTangentLine);
Double radian = pTangentLine.Angle;
//Double angle = radian * 180 / Math.PI;
//// 如果要设置正角度执行以下方法
//while (angle < 0)
//{
// angle = angle + 360;
//}
//// 返回角度
//return angle;
// 返回弧度
return(radian);
}