/// <summary> 提取断面中对应的边坡对象。在某些断面中，可能根本就不会画出边坡线，此时返回 null </summary>
/// <param name="left">true 表示提取左边的边坡， false 表示提取右边的边坡</param>
/// <returns></returns>
public SlopeLine GetSlopeLine(bool left)
{
var xdata = XData;
var db = DocMdf.acDataBase;
if (left)
{
if (xdata.LeftSlopeExists)
{
var pl = xdata.LeftSlopeHandle.GetDBObject <Polyline>(db);
var retainingWall = xdata.LeftRetainingWallType != RetainingWallType.无
? xdata.LeftRetainingWallHandle.GetDBObject <Polyline>(db)
: null;
var slp = new SlopeLine(DocMdf, pl, this, onLeft: true, isFill: xdata.LeftSlopeFill.Value,
retainingWallType: xdata.LeftRetainingWallType, retainingWall: retainingWall);
return(slp);
}
}
else
{
if (xdata.RightSlopeExists)
{
var pl = xdata.RightSlopeHandle.GetDBObject <Polyline>(db);
var retainingWall = xdata.RightRetainingWallType != RetainingWallType.无
? xdata.RightRetainingWallHandle.GetDBObject <Polyline>(db)
: null;
var slp = new SlopeLine(DocMdf, pl, this, onLeft: false, isFill: xdata.RightSlopeFill.Value,
retainingWallType: xdata.RightRetainingWallType, retainingWall: retainingWall);
return(slp);
}
}
return(null);
}
/// <summary> 搜索边坡线 </summary>
/// <param name="leftFill">左边边坡为填方还是挖方</param>
/// <param name="rightFill">右边边坡为填方还是挖方</param>
private bool FindSlopes(Extents3d extSection, out Polyline leftSlope, out bool leftFill, out Polyline rightSlope, out bool rightFill)
{
leftSlope = null;
rightSlope = null;
leftFill = false;
rightFill = false;
var res = DocMdf.acEditor.SelectCrossingWindow(
pt1: extSection.MinPoint,
pt2: extSection.MaxPoint,
filter: SlopeLine.Filter);
if (res.Status == PromptStatus.OK)
{
var lines = res.Value.GetObjectIds().Select(id => id.GetObject(OpenMode.ForRead)).OfType <Polyline>().ToList();
var lefts =
lines.Where(l => SlopeLine.IsSlopeLineLayer(l.Layer, left: true)).ToArray();
if (lefts.Length > 0)
{
// 从多个边坡线中搜索某个端点距离中轴线中心最近的那一条
var slp = GetClosestPolyLine(lefts, _MiddlePt);
// 当界面图形缩得太小时，有可以会把其他断面中的挡墙误加进来，
// 此时通过挡墙多段线中的某点是否位于此断面的Extends范围之内来确定它是否真是本断面的挡墙
if (slp != null && extSection.Contains(slp.StartPoint))
{
leftSlope = slp as Polyline;
leftFill = slp.Layer == Options_LayerNames.LayerName_Slope_Left_Fill;
}
}
var rights =
lines.Where(l => SlopeLine.IsSlopeLineLayer(l.Layer, left: false)).ToArray();
if (rights.Length > 0)
{
// 从多个边坡线中搜索某个端点距离中轴线中心最近的那一条
var slp = GetClosestPolyLine(rights, _MiddlePt);
if (slp != null && extSection.Contains(slp.StartPoint))
{
rightSlope = slp as Polyline;
rightFill = slp.Layer == Options_LayerNames.LayerName_Slope_Right_Fill;
}
}
}
// 对于一个横断面而言，可以没有边坡线，即不进行挖填
return(true);
}
/// <summary>
/// 计算道路横断面的某一侧中，从路面中心到边坡外边缘的范围内，属于填方的区域在 AutoCAD 几何中的 X 范围
/// </summary>
/// <param name="sec"></param>
/// <param name="left"></param>
/// <param name="slp"> 某一侧边坡，其值可能为null，表示此侧没有边坡线 </param>
/// <param name="cGround"></param>
/// <param name="db"></param>
/// <param name="edgeXleft">此侧边坡的填方左边界</param>
/// <param name="edgeXright">此侧边坡的填方右边界</param>
/// <returns>如果没有填方区域，则返回 false </returns>
public bool GetFillSlopeXRange(bool left, SlopeLine slp, CompositeCurve2d cGround, Database db,
out double edgeXleft, out double edgeXright)
{
edgeXleft = 0.0;
edgeXright = 0.0;
var centerFill = IsCenterFill();
var slopeFill = slp == null || slp.XData.FillCut;
if (!centerFill && (slp == null || !slopeFill))
{
return(false);
}
// 确定进行搜索的左右边界：路基边缘（或边坡脚） 到 道路中线
double roadEdge = left ? LeftRoadEdge.X : RightRoadEdge.X;
double slopeEdge = roadEdge; // 边坡的坡脚的 X 值
if (slp != null && slp.XData.Slopes.Count > 0)
{
var data = slp.XData;
slopeEdge = data.Slopes[data.Slopes.Count - 1].OuterPoint.X;
}
if (centerFill && slopeFill)
{
// 道路中心与边坡均为填方
double edgeX1 = CenterX;
edgeXleft = Math.Min(edgeX1, slopeEdge);
edgeXright = Math.Max(edgeX1, slopeEdge);
}
else
{
// 说明 坡脚与道路中心这二者中有一个为挖方，另一个为填方
var roadSurfHandle = left ? LeftRoadSurfaceHandle : RightRoadSurfaceHandle;
var roadSurf = roadSurfHandle.GetDBObject <Polyline>(db);
var cRoad = roadSurf.Get2dLinearCurve();
var inters = new CurveCurveIntersector2d(cRoad, cGround);
double iX;
if (inters.NumberOfIntersectionPoints > 0)
{
iX = inters.GetIntersectionPoint(0).X;
}
else
{
// 这种情况极少会出现，但测试中确实会有，即自然地面线与挖方坡底边沟相交，而不与路面相交
iX = roadEdge;
}
// 自然地面与路面的交点
var roadWidth = Math.Abs((roadEdge - CenterX));
var innerRatio = Math.Abs((iX - CenterX) / roadWidth);
if ((centerFill && innerRatio > 0.5))
{
// 靠道路中心为填方，边坡为挖方
if (left)
{
edgeXleft = iX;
edgeXright = CenterX;
}
else
{
edgeXleft = CenterX;
edgeXright = iX;
}
}
else if (!centerFill && innerRatio <= 0.5)
{
// 靠道路中心为挖方，边坡为填方
if (left)
{
edgeXleft = slopeEdge;
edgeXright = iX;
}
else
{
edgeXleft = iX;
edgeXright = slopeEdge;
}
}
else
{
// 填方区域太小
return(false);
}
}
return(true);
}