//public void SetSlope(ref List <CEdge > CEdgeLt)
//{
// CGeoFunc.SetSlope(ref CEdgeLt);
//}
/// <summary>Detect the intesection between two edges</summary>
/// <returns >the intersection point</returns>
/// <remarks>the edges have to be set slope before using this function
/// If the two edges overlap, then the IntersectCpt is the point with larger XY coordinate of the two ends of the overlap line segment
/// </remarks>
public void DetectIntersection()
{
CEdge cedge1 = _CEdge1;
CEdge cedge2 = _CEdge2;
cedge1.JudgeAndSetSlope();
cedge2.JudgeAndSetSlope();
CPoint IntersectCpt = null;
CEdge overlapcedge = null;
CEnumIntersectionType penumIntersectionType = CEnumIntersectionType.NoNo;
if (cedge1.blnHasSlope == true && cedge2.blnHasSlope == true) //this is the normal case
{
//if (CCmpMethods.Cmp(cedge1.dblSlope, cedge2.dblSlope)==0) //parallel
if (CCmpMethods.CmpDbl_ConstVerySmall(cedge1.dblSlope, cedge2.dblSlope) == 0) //parallel
{
if (CCmpMethods.CmpDbl_CoordVerySmall(cedge1.dblYIntercept, cedge2.dblYIntercept) == 0) //parallel and with the same YIntercept
{
penumIntersectionType = DetectIntersectionParralel(cedge1, cedge2, out IntersectCpt, out overlapcedge);
}
else //parallel but not with the same YIntercept
{
penumIntersectionType = CEnumIntersectionType.NoNo;
}
}
else //not parallel
{
penumIntersectionType = DetectIntersectionNormal(cedge1, cedge2, out IntersectCpt);
}
}
else if (cedge1.blnHasSlope == true && cedge2.blnHasSlope == false)
{
penumIntersectionType = DetectIntersectionOneNoSlope(cedge1, cedge2, out IntersectCpt);
}
else if (cedge1.blnHasSlope == false && cedge2.blnHasSlope == true)
{
penumIntersectionType = DetectIntersectionOneNoSlope(cedge2, cedge1, out IntersectCpt);
penumIntersectionType = ReverseIntersectionType(penumIntersectionType);
}
else if (cedge1.blnHasSlope == false && cedge2.blnHasSlope == false)
{
if (CCmpMethods.CmpDbl_CoordVerySmall(cedge1.FrCpt.X, cedge2.FrCpt.X) == 0) //parallel and with the same X Coordinate
{
penumIntersectionType = DetectIntersectionParralel(cedge1, cedge2, out IntersectCpt, out overlapcedge);
}
else //parallel but not with the same X Coordinate
{
penumIntersectionType = CEnumIntersectionType.NoNo;
}
}
_enumIntersectionType = penumIntersectionType;
_IntersectCpt = IntersectCpt;
_OverlapCEdge = overlapcedge;
}
public CIntersection(CEdge cedge1, CEdge cedge2, CPoint pIntersectCpt, CEdge pOverlapCEdge,
CEnumIntersectionType penumIntersectionType)
{
_CEdge1 = cedge1;
_CEdge2 = cedge2;
_IntersectCpt = pIntersectCpt;
_OverlapCEdge = pOverlapCEdge;
_enumIntersectionType = penumIntersectionType;
}
/// <summary>
/// QueryMovedPt
/// </summary>
/// <param name="dblRatioforMovePt">the ratio of length1 (start point to target point) to length2 (start point to end point) on a base line</param>
/// <param name="dblLengthforMovePt">the distance of the original point (on the polyline) to the targest point (on the base line)</param>
/// <param name="dblAngleDiffforMovePt">the angle difference of segment1 (target point to original point) and segment2 (target point to end point)</param>
/// <param name="dblProp">t</param>
/// <param name="intID">ID of the original point</param>
/// <returns></returns>
public CPoint QueryMovedPt(double dblRatioforMovePt, double dblLengthforMovePt, double dblAngleDiffforMovePt, double dblProp, int intID)
{
double dblAngle = _dblAxisAngle - dblAngleDiffforMovePt;
CPoint targetcpt = CGeoFunc.GetInbetweenCpt(_FrCpt, _ToCpt, dblRatioforMovePt);
double dblresultLength = (1 - dblProp) * dblLengthforMovePt;
double dblresultX = targetcpt.X + dblresultLength * Math.Cos(dblAngle);
double dblresultY = targetcpt.Y + dblresultLength * Math.Sin(dblAngle);
return(new CPoint(intID, dblresultX, dblresultY));
}
public static bool IsVertexIntersection(CPoint cpt)
{
if (cpt.IncidentCEdge.indexID == cpt.IncidentCEdge.GetLargerAxisAngleCEdge().GetLargerAxisAngleCEdge().indexID)
{
return(false);
}
else
{
return(true);
}
}
///// <summary>
///// 指定点沿着曲线到起点的距离
///// </summary>
///// <param name="pPoint">待计算的点</param>
///// <param name="pPolyline">点所在的曲线</param>
///// <param name="blnasRatio">指定计算相对距离还是绝对距离</param>
///// <returns></returns>
//public double CalDistanceFromStartPoint(IPoint pPoint, bool blnasRatio)
//{
// IPoint outPoint = new PointClass();
// double distanceAlongCurve = 0;//该点在曲线上最近的点距曲线起点的距离
// double distanceFromCurve = 0;//该点到曲线的直线距离
// bool bRightSide = false;
// this.QueryPointAndDistance(esriSegmentExtension.esriNoExtension, pPoint, blnasRatio, outPoint, ref distanceAlongCurve, ref distanceFromCurve, ref bRightSide);
// return distanceAlongCurve;
//}
/// <summary>
///
/// </summary>
/// <param name="distanceAlongCurve"></param>
/// <param name="distanceFromCurve"></param>
/// <param name="bRightSide"></param>
/// <returns>the point</returns>
//public CPoint QueryPointByDistances(double distanceAlongCurve, bool basRatioAlong, double distanceFromCurve, bool bRightSide)
//{
// ILine pNomalLine = new LineClass();
// this._pLine.QueryNormal(esriSegmentExtension.esriExtendEmbedded,
//distanceAlongCurve, basRatioAlong, distanceFromCurve, pNomalLine);
// //this.SetEmpty();
// IPoint outpoint = new PointClass();
// if (bRightSide == true)
// {
// pNomalLine.QueryPoint(esriSegmentExtension.esriNoExtension, 1, true, outpoint);
// }
// else
// {
// pNomalLine.QueryPoint(esriSegmentExtension.esriExtendAtFrom, -1, true, outpoint);
// }
// CPoint cpt = new CPoint(0, outpoint);
// return cpt;
//}
/// <summary>
/// you must setlength before using this function
/// </summary>
public double QueryPtHeight(CPoint querycpt)
{
if (this.blnHasSlope == true)
{
return(Math.Abs(this.dblYIntercept + this.dblSlope * querycpt.X - querycpt.Y) * this.dblValueForDis);
}
else
{
return(Math.Abs(querycpt.X - this.FrCpt.X));
}
}
/// <summary>
/// 通过折线上两节点获取该折线的子折线
/// </summary>
/// <param name="cpt1">需获取的子折线上的终点之一</param>
/// <param name="cpt2">需获取的子折线上的终点之一 2</param>
public CPolyline GetSubPolyline(CPoint cpt1, CPoint cpt2)
{
CPolyline subcpl = GetSubPolyline(cpt1.ID, cpt2.ID);
if (subcpl.FrCpt.Equals2D(cpt1) == false || subcpl.ToCpt.Equals2D(cpt2) == false)
{
MessageBox.Show("there is a problem in GetSubPolyline!");
}
return(subcpl);
}
private bool DetermineIsTouch(CEdge cedge1, CEdge cedge2, ref CPoint IntersectCpt)
{
if (IsOnCEdge(IntersectCpt, cedge1) == false || IsOnCEdge(IntersectCpt, cedge2) == false)
{
return(false);
}
else
{
return(true);
}
}
private static bool IsOnCEdge(CPoint cpt, CEdge cedge)
{
if (CCmpMethods.IsInbetween(cpt.X, cedge.FrCpt.X, cedge.ToCpt.X) == false ||
CCmpMethods.IsInbetween(cpt.Y, cedge.FrCpt.Y, cedge.ToCpt.Y) == false)
{
return(false);
}
else
{
return(true);
}
}
//public CptEdgeDis()
//{
//}
public CptEdgeDis(double dbldis = 0, double dblt = -1, CPoint frcpt = null, CEdge frcedge = null,
CPoint tocpt = null, CEdge tocedge = null, bool blnheight = false)
{
this.GID = _intStaticGID++;
this.dblDis = dbldis;
this.t = dblt;
this.FrCpt = frcpt;
this.FrCEdge = frcedge;
this.ToCpt = tocpt;
this.ToCEdge = tocedge;
this.blnHeight = blnheight;
}
/// <summary>
/// Initializes a new cedge instance
/// </summary>
/// <param name="eFrCpt">Start cedge vertex index</param>
/// <param name="eToCpt">End cedge vertex index</param>
public CEdge(CPoint eFrCpt, CPoint eToCpt, bool isSetLength = false)
{
this.GID = _intStaticGID++;
_FrCpt = eFrCpt;
_ToCpt = eToCpt;
_intIncrease = eToCpt.Compare(eFrCpt);
if (isSetLength == true)
{
SetLength();
}
}
/// <summary>
/// Initializes a new instance of a triangle
/// </summary>
/// <param name="point1">Vertex 1</param>
/// <param name="point2">Vertex 2</param>
/// <param name="point3">Vertex 3</param>
public CTriangle(int intTID, CPoint point1, CPoint point2, CPoint point3)
{
List <CPoint> cptlt = new List <CPoint>(3);
cptlt.Add(point1);
cptlt.Add(point2);
cptlt.Add(point3);
_CptLt = cptlt;
_intTID = intTID;
FormCEdge(cptlt);
FormPolygon(cptlt);
}
public static void ShowEdgeRelationshipAroundCpt(CPoint cpt)
{
CEdge IncidentCEdge = cpt.IncidentCEdge;
CEdge currentcedge = IncidentCEdge;
Console.WriteLine("-------------------------------start Around Cpt------------------------------");
do
{
CDCEL.ShowEdgeRelationship(currentcedge);
currentcedge = currentcedge.GetLargerAxisAngleCEdge();
} while (IncidentCEdge.dblAxisAngle != currentcedge.dblAxisAngle);
Console.WriteLine("-------------------------------end Around Cpt------------------------------");
}
private CEnumIntersectionType DetectIntersectionParralelIncrease(CEdge cedge1, CEdge cedge2,
out CPoint IntersectCpt, out CEdge overlapcedge)
{
if (CCmpMethods.CmpCptXY(cedge1.ToCpt, cedge2.ToCpt) <= 0) //we compare both x and y so that we can handle two edges which have no slope
{
return(DetectIntersectionParralelIncreaseCEdge2Righter(cedge1, cedge2, out IntersectCpt, out overlapcedge));
}
else
{
CEnumIntersectionType enumIntersectionType =
DetectIntersectionParralelIncreaseCEdge2Righter(cedge2, cedge1, out IntersectCpt, out overlapcedge);
return(ReverseIntersectionType(enumIntersectionType));
}
}
private CEnumIntersectionType DetectIntersectionParralel(CEdge cedge1, CEdge cedge2,
out CPoint IntersectCpt, out CEdge overlapcedge)
{
CEdge auxCEdge1 = cedge1;
bool blnReversed1 = false;
if (CCmpMethods.CmpCptXY(cedge1.FrCpt, cedge1.ToCpt) == 1)
{
auxCEdge1 = new CEdge(cedge1.ToCpt, cedge1.FrCpt);
blnReversed1 = true;
}
CEdge auxCEdge2 = cedge2;
bool blnReversed2 = false;
if (CCmpMethods.CmpCptXY(cedge2.FrCpt, cedge2.ToCpt) == 1)
{
auxCEdge2 = new CEdge(cedge2.ToCpt, cedge2.FrCpt);
blnReversed2 = true;
}
CEnumIntersectionType penumIntersectionType =
DetectIntersectionParralelIncrease(auxCEdge1, auxCEdge2, out IntersectCpt, out overlapcedge);
if (penumIntersectionType == CEnumIntersectionType.FrTo || penumIntersectionType == CEnumIntersectionType.ToFr) //besides, penumIntersectionType coud be CEnumIntersectionType.NoNo or CEnumIntersectionType.Overlap
{
string substr1 = penumIntersectionType.ToString().Substring(0, 2);
string substr2 = penumIntersectionType.ToString().Substring(2, 2);
if (blnReversed1 == true)
{
substr1 = ReverseEnd(substr1);
}
if (blnReversed2 == true)
{
substr2 = ReverseEnd(substr2);
}
string strIntersectionType = substr1 + substr2;
return((CEnumIntersectionType)Enum.Parse(typeof(CEnumIntersectionType), strIntersectionType));
}
return(penumIntersectionType);
}
private bool FindCorrCptInSDByTinNode(ITinNode pTinNode, SortedDictionary <CPoint, CPoint> CptSD, out CPoint outcpt)
{
CPoint tincpt = new CPoint(pTinNode);
bool isFound = CptSD.TryGetValue(tincpt, out outcpt);
if (isFound == false)
{
Console.WriteLine("cannot find a point" + tincpt.X + " " + tincpt.Y
+ " " + " of a TinNode in: " + this.ToString() + ".cs ");
double dblOriginaldblVerySmall = CConstants.dblVerySmallCoord;
do
{
CConstants.dblVerySmallCoord = CConstants.dblVerySmallCoord * 10;
isFound = CptSD.TryGetValue(tincpt, out outcpt);
} while (isFound == false);
CConstants.dblVerySmallCoord = dblOriginaldblVerySmall;
}
return(isFound);
}
/// <summary>
/// Makes a planar checks for if the points is spatially equal to another point.
/// </summary>
/// <param name="other">Point to check against</param>
/// <returns>True if X and Y values are the same</returns>
public bool Equals2D(CPoint other)
{
return(CCmpMethods.ConvertCmpToBool(CCmpMethods.CmpCptYX(this, other)));
}
/// <summary>
///
/// </summary>
/// <param name="cpt"></param>
/// <param name="newcedge">newcedge should have a twin edge</param>
public static void InsertCEdgeAtCpt(CPoint cpt, CEdge newcedge)
{
var SmallerAxisAngleCEdge = FindSmallerAxisAngleCEdgebyCEdge(cpt, newcedge, false);
InsertCEdgeBySmaller(SmallerAxisAngleCEdge, newcedge);
}
public CPolyline(int intID, CPoint cpt1, CPoint cpt2, bool blnSetPolyline = false)
: this(intID, CHelpFunc.MakeLt <CPoint>(cpt1, cpt2), blnSetPolyline)
{
}
/// <summary>
/// Makes a planar checks for if the points is spatially equal to another point.
/// </summary>
/// <param name="other">Point to check against</param>
/// <returns>True if X and Y values are the same</returns>
public bool Equals2D(CPoint other, double dblVerySmall)
{
return(CCmpMethods.ConvertCmpToBool(CCmpMethods.CmpCptYX(this, other)));
}
private CEnumIntersectionType DetectIntersectionParralelIncreaseCEdge2Righter(CEdge cedge1, CEdge cedge2,
out CPoint IntersectCpt, out CEdge overlapcedge)
{
IntersectCpt = null;
overlapcedge = null;
if (CCmpMethods.CmpCptXY(cedge1.ToCpt, cedge2.FrCpt) == -1) //we compare both x and y so that we can handle two edges haveing no slope
{
return(CEnumIntersectionType.NoNo);
}
else if (CCmpMethods.CmpCptXY(cedge1.ToCpt, cedge2.FrCpt) == 0) //we compare both x and y so that we can handle two edges haveing no slope
{
IntersectCpt = cedge1.ToCpt;
return(CEnumIntersectionType.ToFr);
}
else // if (CCmpMethods.CmpXY(cedge1.ToCpt, cedge2.FrCpt) == 1) //we compare both x and y so that we can handle two edges haveing no slope
{
CPoint frcpt = null;
if (CCmpMethods.CmpCptXY(cedge1.FrCpt, cedge2.FrCpt) == 1) //we compare both x and y so that we can handle two edges haveing no slope
{
frcpt = cedge1.FrCpt;
}
else
{
frcpt = cedge2.FrCpt;
}
//overlapcedge = new CEdge(frcpt, cedge1.ToCpt); //to save memory, we don't record the overlapcedge
IntersectCpt = cedge1.ToCpt;
return(CEnumIntersectionType.Overlap);
}
}
///// <summary>whether a point is in cedge (we already know that the point is on the line that goes through the cedge)</summary>
///// <returns> -1, nonsense,
///// 1, this point is not on the Edge
///// 2, this point is the FrCpt
///// 3, this point is in the Edge
///// 4, this point is the ToCpt</returns>
///// <remarks></remarks>
/// <summary>
///
/// </summary>
/// <param name="cpt"></param>
/// <param name="cedge"></param>
/// <returns> "No", "Fr", "In", "To"</returns>
public static string InCEdge(CPoint cpt, CEdge cedge)
{
//we test both x and y. if we only test one coordinate, we may get wrong result.
// for example, there is an intersection that is actually in an edge, and this edge is almost vertical.
// if we only test the x coordinate, then we will get that the intersection is the end (on the boundary) of this edge
// because we use dblVerysmall to judge
//cedge.SetLength();
int intCompareX = CCmpMethods.CmpThreeCoord(cpt.X, cedge.FrCpt.X, cedge.ToCpt.X);
int intCompareY = CCmpMethods.CmpThreeCoord(cpt.Y, cedge.FrCpt.Y, cedge.ToCpt.Y);
//the result is a result of a 6*6 matrix
string strInCEdge = "";
if (intCompareX == 1 || intCompareX == 5 || intCompareY == 1 || intCompareY == 5) //this point is not on the Edge
{
strInCEdge = "No";
}
else if (intCompareX == 3 || intCompareY == 3) //this point is in the Edge
{
strInCEdge = "In";
}
else // if (intCompareX, intCompareY = 0, 2, 4), //this point is one of the ends of the Edge
{
if (intCompareX == 0)
{
if (intCompareY == 0 || intCompareY == 2)
{
strInCEdge = "Fr";
}
else //if (intCompareY==4)
{
strInCEdge = "To";
}
}
else if (intCompareX == 2)
{
if (intCompareY == 0 || intCompareY == 2)
{
strInCEdge = "Fr";
}
else //if (intCompareY==4) //unfortunately, this can happen!!!
{
//MessageBox.Show("This cannot happen! InCEdge!"); //
strInCEdge = "In";
}
}
else //if (intCompareX == 4)
{
if (intCompareY == 0 || intCompareY == 4)
{
strInCEdge = "To";
}
else //if (intCompareY==2)
{
//MessageBox.Show("This cannot happen! InCEdge!");
strInCEdge = "In";
}
}
}
return(strInCEdge);
}
//public CEdge GetEdgeIncrease()
//{
// int intCompare = CCmpMethods.Cmp(_FrCpt, _ToCpt);
// if (intCompare<=0)
// {
// return this;
// }
// else
// {
// return new CEdge (_ToCpt,_FrCpt);
// }
//}
public double CalInbetweenCptProportion(CPoint cpt)
{
return(CGeoFunc.CalInbetweenCptProportion(cpt, _FrCpt, _ToCpt));
}
public CPolyline(int intID, CPoint cpt, bool blnSetPolyline = false)
: this(intID, CHelpFunc.MakeLt(cpt), blnSetPolyline)
{
}
/// <summary>
///the intersection of two line segments. The two segments both have slope and not parrallel
/// </summary>
private CEnumIntersectionType DetectIntersectionNormal(CEdge cedge1, CEdge cedge2, out CPoint IntersectCpt)
{
IntersectCpt = new CPoint(-1); //the intersection of the two lines, not the two line segments
IntersectCpt.X = (cedge2.dblYIntercept - cedge1.dblYIntercept) / (cedge1.dblSlope - cedge2.dblSlope);
IntersectCpt.Y = IntersectCpt.X * cedge1.dblSlope + cedge1.dblYIntercept;
return(DetermineIntersectCase(cedge1, cedge2, ref IntersectCpt));
}
/// <summary>
///
/// </summary>
/// <param name="cedge1"></param>
/// <param name="cedge2"></param>
/// <param name="IntersectCpt"></param>
/// <returns></returns>
private CEnumIntersectionType DetermineIntersectCase(CEdge cedge1, CEdge cedge2, ref CPoint IntersectCpt)
{
string strInCEdge1 = InCEdge(IntersectCpt, cedge1);
string strInCEdge2 = InCEdge(IntersectCpt, cedge2);
//to save memory, we always use the original points if the intersection overlaps an original point
//we set the intersection to null if there is no intersection
if (strInCEdge1 == "No" || strInCEdge2 == "No")
{
IntersectCpt = null;
}
else if (strInCEdge1 == "Fr")
{
IntersectCpt = cedge1.FrCpt;
}
else if (strInCEdge1 == "To")
{
IntersectCpt = cedge1.ToCpt;
}
else //if(strInCEdge1 == "In")
{
if (strInCEdge2 == "Fr")
{
IntersectCpt = cedge2.FrCpt;
}
else if (strInCEdge2 == "To")
{
IntersectCpt = cedge2.ToCpt;
}
else //if(strInCEdge2 == "In")
{
//IntersectCpt = IntersectCpt;
}
}
if (strInCEdge1 == "No" || strInCEdge2 == "No")
{
return(CEnumIntersectionType.NoNo); //do we really need do this seperately?
}
else
{
string strIntersectionType = strInCEdge1 + strInCEdge2;
return((CEnumIntersectionType)Enum.Parse(typeof(CEnumIntersectionType), strIntersectionType));
}
}
/// <summary>Detect the intesection between two edges</summary>
private CEnumIntersectionType DetectIntersectionOneNoSlope(CEdge cedge, CEdge cedgeNoSlope, out CPoint IntersectCpt)
{
IntersectCpt = new CPoint(-1); //the intersection of the two lines, not the two line segments
IntersectCpt.X = cedgeNoSlope.FrCpt.X;
IntersectCpt.Y = IntersectCpt.X * cedge.dblSlope + cedge.dblYIntercept;
return(DetermineIntersectCase(cedge, cedgeNoSlope, ref IntersectCpt));
}
public void SetOuterFaceCptlt(bool clockwise = true, bool blnIdentical = true, CPoint StartPositionCpt = null)
{
this.CptLt = GetOuterCptEb(clockwise, blnIdentical, StartPositionCpt).ToList();
}
public IEnumerable <CPoint> GetOuterCptEb(bool clockwise = true, bool blnIdentical = true, CPoint StartPositionCpt = null)
{
var pOuterCmptCEdge = _OuterCmptCEdge;
if (pOuterCmptCEdge == null)
{
throw new ArgumentException("Super face does not have an outer ring!");
}
if (StartPositionCpt != null)
{
pOuterCmptCEdge = TraverseToGetCorrectCEdgeComponent(pOuterCmptCEdge, StartPositionCpt);
}
if (clockwise == true) //for an outer path, the edges are stored counter-clockwise in DCEL
{
foreach (var cpt in TraverseToGetCptEb(pOuterCmptCEdge, false))
{
yield return(cpt);
}
}
else
{
foreach (var cpt in TraverseToGetCptEb(pOuterCmptCEdge, true))
{
yield return(cpt);
}
}
if (blnIdentical == true)
{
yield return(pOuterCmptCEdge.FrCpt);
}
}
public CEdge DetectCloestLeftCorrectCEdge(CPoint cpt)
{
CGeoFunc.DetectCloestLeftCEdge(cpt, _pEdgeGrid);
return(CGeoFunc.GetCorrectEdge(cpt));
}
/// <summary>
///
/// </summary>
/// <param name="cedgeComponent"></param>
/// <param name="blnNext"></param>
/// <returns></returns>
private static CEdge TraverseToGetCorrectCEdgeComponent(CEdge cedgeComponent, CPoint cpt)
{
var currentcedge = cedgeComponent;
do
{
if (CCmpMethods.CmpCptYX(currentcedge.FrCpt, cpt) == 0)
{
return(currentcedge);
}
currentcedge = currentcedge.cedgeNext;
} while (currentcedge.GID != cedgeComponent.GID);
throw new ArgumentException("we cannot find an appropriate edge!");
}