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Contour.cs
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Contour.cs
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//******************************
// Copyright 2012 Yaqiang Wang,
// yaqiang.wang@gmail.com
//******************************
using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;
#if !NETSTANDARD1_0
using PointF = System.Drawing.PointF;
#else
using PointF = wContour.PointF;
#endif
namespace wContour
{
/// <summary>
/// Contour
/// </summary>
public static class Contour
{
private static List<EndPoint> _endPointList = new List<EndPoint>();
#region Public Contour Methods
/// <summary>
/// Tracing contour lines from the grid data with undefine data
/// </summary>
/// <param name="S0">input grid data</param>
/// <param name="X">X coordinate array</param>
/// <param name="Y">Y coordinate array</param>
/// <param name="nc">number of contour values</param>
/// <param name="contour">contour value array</param>
/// <param name="undefData">Undefine data</param>
/// <param name="borders">borders</param>
/// <param name="S1">data flag array</param>
/// <returns>Contour line list</returns>
public static List<PolyLine> TracingContourLines(double[,] S0, double[] X, double[] Y,
int nc, double[] contour, double undefData, List<Border> borders, int[,] S1)
{
double dx = X[1] - X[0];
double dy = Y[1] - Y[0];
List<PolyLine> contourLines = CreateContourLines_UndefData(S0, X, Y, nc, contour, dx, dy, S1, undefData, borders);
return contourLines;
}
/// <summary>
/// Tracing contour borders of the grid data with undefined data.
/// Grid data are from left to right and from bottom to top.
/// Grid data array: first dimention is Y, second dimention is X.
/// </summary>
/// <param name="S0">grid data</param>
/// <param name="X">x coordinate</param>
/// <param name="Y">y coordinate</param>
/// <param name="S1"></param>
/// <param name="undefData">undefine data</param>
/// <returns>borderline list</returns>
public static List<Border> TracingBorders(double[,] S0, double[] X, double[] Y, ref int[,] S1, double undefData)
{
List<BorderLine> borderLines = new List<BorderLine>();
int m, n, i, j;
m = S0.GetLength(0); //Y
n = S0.GetLength(1); //X
S1 = new int[m, n]; //---- New array (0 with undefine data, 1 with data)
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
if (DoubleEquals(S0[i, j], undefData)) //Undefine data
S1[i, j] = 0;
else
S1[i, j] = 1;
}
}
//---- Border points are 1, undefine points are 0, inside data points are 2
//l - Left; r - Right; b - Bottom; t - Top; lb - LeftBottom; rb - RightBottom; lt - LeftTop; rt - RightTop
int l, r, b, t, lb, rb, lt, rt;
for (i = 1; i < m - 1; i++)
{
for (j = 1; j < n - 1; j++)
{
if (S1[i, j] == 1) //data point
{
l = S1[i, j - 1];
r = S1[i, j + 1];
b = S1[i - 1, j];
t = S1[i + 1, j];
lb = S1[i - 1, j - 1];
rb = S1[i - 1, j + 1];
lt = S1[i + 1, j - 1];
rt = S1[i + 1, j + 1];
if (l > 0 && r > 0 && b > 0 && t > 0 && lb > 0 && rb > 0 && lt > 0 && rt > 0)
S1[i, j] = 2; //Inside data point
if (l + r + b + t + lb + rb + lt + rt <= 2)
S1[i, j] = 0; //Data point, but not more than 3 continued data points together.
//So they can't be traced as a border (at least 4 points together).
}
}
}
//---- Remove isolated data points (up, down, left and right points are all undefine data).
bool isContinue = false;
while (true)
{
isContinue = false;
for (i = 1; i < m - 1; i++)
{
for (j = 1; j < n - 1; j++)
{
if (S1[i, j] == 1) //data point
{
l = S1[i, j - 1];
r = S1[i, j + 1];
b = S1[i - 1, j];
t = S1[i + 1, j];
lb = S1[i - 1, j - 1];
rb = S1[i - 1, j + 1];
lt = S1[i + 1, j - 1];
rt = S1[i + 1, j + 1];
if ((l == 0 && r == 0) || (b == 0 && t == 0)) //Up, down, left and right points are all undefine data
{
S1[i, j] = 0;
isContinue = true;
}
if ((lt == 0 && r == 0 && b == 0) || (rt == 0 && l == 0 && b == 0) ||
(lb == 0 && r == 0 && t == 0) || (rb == 0 && l == 0 && t == 0))
{
S1[i, j] = 0;
isContinue = true;
}
}
}
}
if (!isContinue) //untile no more isolated data point.
break;
}
//Deal with grid data border points
for (j = 0; j < n; j++) //Top and bottom border points
{
if (S1[0, j] == 1)
{
if (S1[1, j] == 0) //up point is undefine
S1[0, j] = 0;
else
{
if (j == 0)
{
if (S1[0, j + 1] == 0)
S1[0, j] = 0;
}
else if (j == n - 1)
{
if (S1[0, n - 2] == 0)
S1[0, j] = 0;
}
else
{
if (S1[0, j - 1] == 0 && S1[0, j + 1] == 0)
S1[0, j] = 0;
}
}
}
if (S1[m - 1, j] == 1)
{
if (S1[m - 2, j] == 0) //down point is undefine
S1[m - 1, j] = 0;
else
{
if (j == 0)
{
if (S1[m - 1, j + 1] == 0)
S1[m - 1, j] = 0;
}
else if (j == n - 1)
{
if (S1[m - 1, n - 2] == 0)
S1[m - 1, j] = 0;
}
else
{
if (S1[m - 1, j - 1] == 0 && S1[m - 1, j + 1] == 0)
S1[m - 1, j] = 0;
}
}
}
}
for (i = 0; i < m; i++) //Left and right border points
{
if (S1[i, 0] == 1)
{
if (S1[i, 1] == 0) //right point is undefine
S1[i, 0] = 0;
else
{
if (i == 0)
{
if (S1[i + 1, 0] == 0)
S1[i, 0] = 0;
}
else if (i == m - 1)
{
if (S1[m - 2, 0] == 0)
S1[i, 0] = 0;
}
else
{
if (S1[i - 1, 0] == 0 && S1[i + 1, 0] == 0)
S1[i, 0] = 0;
}
}
}
if (S1[i, n - 1] == 1)
{
if (S1[i, n - 2] == 0) //left point is undefine
S1[i, n - 1] = 0;
else
{
if (i == 0)
{
if (S1[i + 1, n - 1] == 0)
S1[i, n - 1] = 0;
}
else if (i == m - 1)
{
if (S1[m - 2, n - 1] == 0)
S1[i, n - 1] = 0;
}
else
{
if (S1[i - 1, n - 1] == 0 && S1[i + 1, n - 1] == 0)
S1[i, n - 1] = 0;
}
}
}
}
//---- Generate S2 array from S1, add border to S2 with undefine data.
int[,] S2 = new int[m + 2, n + 2];
for (i = 0; i < m + 2; i++)
{
for (j = 0; j < n + 2; j++)
{
if (i == 0 || i == m + 1) //bottom or top border
S2[i, j] = 0;
else if (j == 0 || j == n + 1) //left or right border
S2[i, j] = 0;
else
S2[i, j] = S1[i - 1, j - 1];
}
}
//---- Using times number of each point during chacing process.
int[,] UNum = new int[m + 2, n + 2];
for (i = 0; i < m + 2; i++)
{
for (j = 0; j < n + 2; j++)
{
if (S2[i, j] == 1)
{
l = S2[i, j - 1];
r = S2[i, j + 1];
b = S2[i - 1, j];
t = S2[i + 1, j];
lb = S2[i - 1, j - 1];
rb = S2[i - 1, j + 1];
lt = S2[i + 1, j - 1];
rt = S2[i + 1, j + 1];
//---- Cross point with two boder lines, will be used twice.
if (l == 1 && r == 1 && b == 1 && t == 1 && ((lb == 0 && rt == 0) || (rb == 0 && lt == 0)))
UNum[i, j] = 2;
else
UNum[i, j] = 1;
}
else
UNum[i, j] = 0;
}
}
//---- Tracing borderlines
PointD aPoint;
IJPoint aijPoint;
BorderLine aBLine = new BorderLine();
List<PointD> pointList = new List<PointD>();
List<IJPoint> ijPList = new List<IJPoint>();
int sI, sJ, i1, j1, i2, j2, i3 = 0, j3 = 0;
for (i = 1; i < m + 1; i++)
{
for (j = 1; j < n + 1; j++)
{
if (S2[i, j] == 1) //Tracing border from any border point
{
pointList = new List<PointD>();
ijPList = new List<IJPoint>();
aPoint = new PointD();
aPoint.X = X[j - 1];
aPoint.Y = Y[i - 1];
aijPoint = new IJPoint();
aijPoint.I = i - 1;
aijPoint.J = j - 1;
pointList.Add(aPoint);
ijPList.Add(aijPoint);
sI = i;
sJ = j;
i2 = i;
j2 = j;
i1 = i2;
j1 = -1; //Trace from left firstly
while (true)
{
if (TraceBorder(S2, i1, i2, j1, j2, ref i3, ref j3))
{
i1 = i2;
j1 = j2;
i2 = i3;
j2 = j3;
UNum[i3, j3] = UNum[i3, j3] - 1;
if (UNum[i3, j3] == 0)
S2[i3, j3] = 3; //Used border point
}
else
break;
aPoint = new PointD();
aPoint.X = X[j3 - 1];
aPoint.Y = Y[i3 - 1];
aijPoint = new IJPoint();
aijPoint.I = i3 - 1;
aijPoint.J = j3 - 1;
pointList.Add(aPoint);
ijPList.Add(aijPoint);
if (i3 == sI && j3 == sJ)
break;
}
UNum[i, j] = UNum[i, j] - 1;
if (UNum[i, j] == 0)
S2[i, j] = 3; //Used border point
//UNum[i, j] = UNum[i, j] - 1;
if (pointList.Count > 1)
{
aBLine = new BorderLine();
aBLine.area = GetExtentAndArea(pointList, ref aBLine.extent);
aBLine.isOutLine = true;
aBLine.isClockwise = true;
aBLine.pointList = pointList;
aBLine.ijPointList = ijPList;
borderLines.Add(aBLine);
}
}
}
}
//---- Form borders
List<Border> borders = new List<Border>();
Border aBorder = new Border();
BorderLine aLine, bLine;
//---- Sort borderlines with area from small to big.
//For inside border line analysis
for (i = 1; i < borderLines.Count; i++)
{
aLine = (BorderLine)borderLines[i];
for (j = 0; j < i; j++)
{
bLine = (BorderLine)borderLines[j];
if (aLine.area > bLine.area)
{
borderLines.RemoveAt(i);
borderLines.Insert(j, aLine);
break;
}
}
}
List<BorderLine> lineList;
if (borderLines.Count == 1) //Only one boder line
{
aLine = (BorderLine)borderLines[0];
if (!IsClockwise(aLine.pointList))
{
aLine.pointList.Reverse();
aLine.ijPointList.Reverse();
}
aLine.isClockwise = true;
lineList = new List<BorderLine>();
lineList.Add(aLine);
aBorder = new Border();
aBorder.LineList = lineList;
borders.Add(aBorder);
}
else //muti border lines
{
for (i = 0; i < borderLines.Count; i++)
{
if (i == borderLines.Count)
break;
aLine = borderLines[i];
if (!IsClockwise(aLine.pointList))
{
aLine.pointList.Reverse();
aLine.ijPointList.Reverse();
}
aLine.isClockwise = true;
lineList = new List<BorderLine>();
lineList.Add(aLine);
//Try to find the boder lines are inside of aLine.
for (j = i + 1; j < borderLines.Count; j++)
{
if (j == borderLines.Count)
break;
bLine = borderLines[j];
if (bLine.extent.xMin > aLine.extent.xMin && bLine.extent.xMax < aLine.extent.xMax &&
bLine.extent.yMin > aLine.extent.yMin && bLine.extent.yMax < aLine.extent.yMax)
{
aPoint = bLine.pointList[0];
if (PointInPolygon(aLine.pointList, aPoint)) //bLine is inside of aLine
{
bLine.isOutLine = false;
if (IsClockwise(bLine.pointList))
{
pointList.Reverse();
bLine.ijPointList.Reverse();
}
bLine.isClockwise = false;
lineList.Add(bLine);
borderLines.RemoveAt(j);
j = j - 1;
}
}
}
aBorder = new Border();
aBorder.LineList = lineList;
borders.Add(aBorder);
}
}
return borders;
}
/// <summary>
/// Create contour lines from the grid data with undefine data
/// </summary>
/// <param name="S0">input grid data</param>
/// <param name="X">X coordinate array</param>
/// <param name="Y">Y coordinate array</param>
/// <param name="nc">number of contour values</param>
/// <param name="contour">contour value array</param>
/// <param name="nx">interval of X coordinate</param>
/// <param name="ny">interval of Y coordinate</param>
/// <param name="S1"></param>
/// <param name="undefData">Undefine data</param>
/// <param name="borders">Border line list</param>
/// <returns>Contour line list</returns>
private static List<PolyLine> CreateContourLines_UndefData(double[,] S0, double[] X, double[] Y,
int nc, double[] contour, double nx, double ny, int[,] S1, double undefData, List<Border> borders)
{
List<PolyLine> contourLineList = new List<PolyLine>();
List<PolyLine> cLineList = new List<PolyLine>();
int m, n, i, j;
m = S0.GetLength(0); //---- Y
n = S0.GetLength(1); //---- X
//---- Add a small value to aviod the contour point as same as data point
double dShift;
dShift = getAbsMinValue(contour) * 0.0000001;
//dShift = contour[0] * 0.0000001;
if (dShift == 0)
dShift = 0.0000001;
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
if (!(DoubleEquals(S0[i, j], undefData)))
//S0[i, j] = S0[i, j] + (contour[1] - contour[0]) * 0.0001;
S0[i, j] = S0[i, j] + dShift;
}
}
//---- Define if H S are border
int[, ,] SB = new int[2, m, n - 1], HB = new int[2, m - 1, n]; //---- Which border and trace direction
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
if (j < n - 1)
{
SB[0, i, j] = -1;
SB[1, i, j] = -1;
}
if (i < m - 1)
{
HB[0, i, j] = -1;
HB[1, i, j] = -1;
}
}
}
Border aBorder;
BorderLine aBLine;
List<IJPoint> ijPList = new List<IJPoint>();
int k, si, sj;
IJPoint aijP, bijP;
for (i = 0; i < borders.Count; i++)
{
aBorder = borders[i];
for (j = 0; j < aBorder.LineNum; j++)
{
aBLine = aBorder.LineList[j];
ijPList = aBLine.ijPointList;
for (k = 0; k < ijPList.Count - 1; k++)
{
aijP = ijPList[k];
bijP = ijPList[k + 1];
if (aijP.I == bijP.I)
{
si = aijP.I;
sj = Math.Min(aijP.J, bijP.J);
SB[0, si, sj] = i;
if (bijP.J > aijP.J) //---- Trace from top
SB[1, si, sj] = 1;
else
SB[1, si, sj] = 0; //----- Trace from bottom
}
else
{
sj = aijP.J;
si = Math.Min(aijP.I, bijP.I);
HB[0, si, sj] = i;
if (bijP.I > aijP.I) //---- Trace from left
HB[1, si, sj] = 0;
else
HB[1, si, sj] = 1; //---- Trace from right
}
}
}
}
//---- Define horizontal and vertical arrays with the position of the tracing value, -2 means no tracing point.
double[,] S = new double[m, n - 1], H = new double[m - 1, n];
double w; //---- Tracing value
int c;
//ArrayList _endPointList = new ArrayList(); //---- Contour line end points for insert to border
for (c = 0; c < nc; c++)
{
w = contour[c];
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
if (j < n - 1)
{
if (S1[i, j] != 0 && S1[i, j + 1] != 0)
{
if ((S0[i, j] - w) * (S0[i, j + 1] - w) < 0) //---- Has tracing value
S[i, j] = (w - S0[i, j]) / (S0[i, j + 1] - S0[i, j]);
else
S[i, j] = -2;
}
else
S[i, j] = -2;
}
if (i < m - 1)
{
if (S1[i, j] != 0 && S1[i + 1, j] != 0)
{
if ((S0[i, j] - w) * (S0[i + 1, j] - w) < 0) //---- Has tracing value
H[i, j] = (w - S0[i, j]) / (S0[i + 1, j] - S0[i, j]);
else
H[i, j] = -2;
}
else
H[i, j] = -2;
}
}
}
cLineList = Isoline_UndefData(S0, X, Y, w, nx, ny, ref S, ref H, SB, HB, contourLineList.Count);
contourLineList.AddRange(cLineList);
}
//---- Set border index for close contours
PolyLine aLine;
//ArrayList pList = new ArrayList();
PointD aPoint;
for (i = 0; i < borders.Count; i++)
{
aBorder = borders[i];
aBLine = aBorder.LineList[0];
for (j = 0; j < contourLineList.Count; j++)
{
aLine = contourLineList[j];
if (aLine.Type == "Close")
{
aPoint = aLine.PointList[0];
if (PointInPolygon(aBLine.pointList, aPoint))
aLine.BorderIdx = i;
}
contourLineList.RemoveAt(j);
contourLineList.Insert(j, aLine);
}
}
return contourLineList;
}
/// <summary>
/// Create contour lines
/// </summary>
/// <param name="S0">input grid data array</param>
/// <param name="X">X coordinate array</param>
/// <param name="Y">Y coordinate array</param>
/// <param name="nc">number of contour values</param>
/// <param name="contour">contour value array</param>
/// <param name="nx">Interval of X coordinate</param>
/// <param name="ny">Interval of Y coordinate</param>
/// <returns></returns>
private static List<PolyLine> CreateContourLines(double[,] S0, double[] X, double[] Y, int nc, double[] contour, double nx, double ny)
{
List<PolyLine> contourLineList = new List<PolyLine>(), bLineList = new List<PolyLine>(), lLineList = new List<PolyLine>(),
tLineList = new List<PolyLine>(), rLineList = new List<PolyLine>(), cLineList = new List<PolyLine>();
int m, n, i, j;
m = S0.GetLength(0); //---- Y
n = S0.GetLength(1); //---- X
//---- Define horizontal and vertical arrays with the position of the tracing value, -2 means no tracing point.
double[,] S = new double[m, n - 1], H = new double[m - 1, n];
double dShift;
dShift = contour[0] * 0.00001;
if (dShift == 0)
dShift = 0.00001;
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
S0[i, j] = S0[i, j] + dShift;
}
double w; //---- Tracing value
int c;
for (c = 0; c < nc; c++)
{
w = contour[c];
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
{
if (j < n - 1)
{
if ((S0[i, j] - w) * (S0[i, j + 1] - w) < 0) //---- Has tracing value
S[i, j] = (w - S0[i, j]) / (S0[i, j + 1] - S0[i, j]);
else
S[i, j] = -2;
}
if (i < m - 1)
{
if ((S0[i, j] - w) * (S0[i + 1, j] - w) < 0) //---- Has tracing value
H[i, j] = (w - S0[i, j]) / (S0[i + 1, j] - S0[i, j]);
else
H[i, j] = -2;
}
}
}
bLineList = Isoline_Bottom(S0, X, Y, w, nx, ny, ref S, ref H);
lLineList = Isoline_Left(S0, X, Y, w, nx, ny, ref S, ref H);
tLineList = Isoline_Top(S0, X, Y, w, nx, ny, ref S, ref H);
rLineList = Isoline_Right(S0, X, Y, w, nx, ny, ref S, ref H);
cLineList = Isoline_Close(S0, X, Y, w, nx, ny, ref S, ref H);
contourLineList.AddRange(bLineList);
contourLineList.AddRange(lLineList);
contourLineList.AddRange(tLineList);
contourLineList.AddRange(rLineList);
contourLineList.AddRange(cLineList);
}
return contourLineList;
}
/// <summary>
/// Cut contour lines with a polygon. Return the polylines inside of the polygon
/// </summary>
/// <param name="alinelist">polyline list</param>
/// <param name="polyList">border points of the cut polygon</param>
/// <returns>Inside Polylines after cut</returns>
private static List<PolyLine> CutContourWithPolygon(List<PolyLine> alinelist, List<PointD> polyList)
{
List<PolyLine> newLineList = new List<PolyLine>();
int i, j, k;
PolyLine aLine = new PolyLine(), bLine = new PolyLine();
List<PointD> aPList = new List<PointD>();
double aValue;
string aType;
bool ifInPolygon;
PointD q1, q2, p1, p2, IPoint;
Line lineA, lineB;
EndPoint aEndPoint = new EndPoint();
_endPointList = new List<EndPoint>();
if (!IsClockwise(polyList)) //---- Make cut polygon clockwise
polyList.Reverse();
for (i = 0; i < alinelist.Count; i++)
{
aLine = alinelist[i];
aValue = aLine.Value;
aType = aLine.Type;
aPList = new List<PointD>(aLine.PointList);
ifInPolygon = false;
List<PointD> newPlist = new List<PointD>();
//---- For "Close" type contour,the start point must be outside of the cut polygon.
if (aType == "Close" && PointInPolygon(polyList, aPList[0]))
{
bool isAllIn = true;
int notInIdx = 0;
for (j = 0; j < aPList.Count; j++)
{
if (!PointInPolygon(polyList, aPList[j]))
{
notInIdx = j;
isAllIn = false;
break;
}
}
if (!isAllIn)
{
List<PointD> bPList = new List<PointD>();
for (j = notInIdx; j < aPList.Count; j++)
bPList.Add(aPList[j]);
for (j = 1; j < notInIdx; j++)
bPList.Add(aPList[j]);
bPList.Add(bPList[0]);
aPList = bPList;
}
}
p1 = new PointD();
for (j = 0; j < aPList.Count; j++)
{
p2 = aPList[j];
if (PointInPolygon(polyList, p2))
{
if (!ifInPolygon && j > 0)
{
lineA = new Line();
lineA.P1 = p1;
lineA.P2 = p2;
q1 = polyList[polyList.Count - 1];
IPoint = new PointD();
for (k = 0; k < polyList.Count; k++)
{
q2 = polyList[k];
lineB = new Line();
lineB.P1 = q1;
lineB.P2 = q2;
if (IsLineSegmentCross(lineA, lineB))
{
IPoint = GetCrossPoint(lineA, lineB);
aEndPoint.sPoint = q1;
aEndPoint.Point = IPoint;
aEndPoint.Index = newLineList.Count;
_endPointList.Add(aEndPoint); //---- Generate _endPointList for border insert
break;
}
q1 = q2;
}
newPlist.Add(IPoint);
aType = "Border";
}
newPlist.Add(aPList[j]);
ifInPolygon = true;
}
else
{
if (ifInPolygon)
{
lineA = new Line();
lineA.P1 = p1;
lineA.P2 = p2;
q1 = polyList[polyList.Count - 1];
IPoint = new PointD();
for (k = 0; k < polyList.Count; k++)
{
q2 = polyList[k];
lineB = new Line();
lineB.P1 = q1;
lineB.P2 = q2;
if (IsLineSegmentCross(lineA, lineB))
{
IPoint = GetCrossPoint(lineA, lineB);
aEndPoint.sPoint = q1;
aEndPoint.Point = IPoint;
aEndPoint.Index = newLineList.Count;
_endPointList.Add(aEndPoint);
break;
}
q1 = q2;
}
newPlist.Add(IPoint);
bLine.Value = aValue;
bLine.Type = aType;
bLine.PointList = newPlist;
newLineList.Add(bLine);
ifInPolygon = false;
newPlist = new List<PointD>();
aType = "Border";
}
}
p1 = p2;
}
if (ifInPolygon && newPlist.Count > 1)
{
bLine.Value = aValue;
bLine.Type = aType;
bLine.PointList = newPlist;
newLineList.Add(bLine);
}
}
return newLineList;
}
/// <summary>
/// Cut contour lines with a polygon. Return the polylines inside of the polygon
/// </summary>
/// <param name="alinelist">polyline list</param>
/// <param name="aBorder">border for cutting</param>
/// <returns>Inside Polylines after cut</returns>
private static List<PolyLine> CutContourLines(List<PolyLine> alinelist, Border aBorder)
{
List<PointD> pointList = aBorder.LineList[0].pointList;
List<PolyLine> newLineList = new List<PolyLine>();
int i, j, k;
PolyLine aLine, bLine;
List<PointD> aPList = new List<PointD>();
double aValue;
string aType;
bool ifInPolygon;
PointD q1, q2, p1, p2, IPoint;
Line lineA, lineB;
EndPoint aEndPoint = new EndPoint();
_endPointList = new List<EndPoint>();
if (!IsClockwise(pointList)) //---- Make cut polygon clockwise
pointList.Reverse();
for (i = 0; i < alinelist.Count; i++)
{
aLine = alinelist[i];
aValue = aLine.Value;
aType = aLine.Type;
aPList = new List<PointD>(aLine.PointList);
ifInPolygon = false;
List<PointD> newPlist = new List<PointD>();
//---- For "Close" type contour,the start point must be outside of the cut polygon.
if (aType == "Close" && PointInPolygon(pointList, (PointD)aPList[0]))
{
bool isAllIn = true;
int notInIdx = 0;
for (j = 0; j < aPList.Count; j++)
{
if (!PointInPolygon(pointList, (PointD)aPList[j]))
{
notInIdx = j;
isAllIn = false;
break;
}
}
if (!isAllIn)
{
List<PointD> bPList = new List<PointD>();
for (j = notInIdx; j < aPList.Count; j++)
bPList.Add(aPList[j]);
for (j = 1; j < notInIdx; j++)
bPList.Add(aPList[j]);
bPList.Add(bPList[0]);
aPList = bPList;
}
}
p1 = new PointD();
for (j = 0; j < aPList.Count; j++)
{
p2 = aPList[j];
if (PointInPolygon(pointList, p2))
{
if (!ifInPolygon && j > 0)
{
lineA = new Line();
lineA.P1 = p1;
lineA.P2 = p2;
q1 = pointList[pointList.Count - 1];
IPoint = new PointD();
for (k = 0; k < pointList.Count; k++)
{
q2 = pointList[k];
lineB = new Line();
lineB.P1 = q1;
lineB.P2 = q2;
if (IsLineSegmentCross(lineA, lineB))
{
IPoint = GetCrossPoint(lineA, lineB);
aEndPoint.sPoint = q1;
aEndPoint.Point = IPoint;
aEndPoint.Index = newLineList.Count;
_endPointList.Add(aEndPoint); //---- Generate _endPointList for border insert
break;
}
q1 = q2;
}
newPlist.Add(IPoint);
aType = "Border";
}
newPlist.Add(aPList[j]);
ifInPolygon = true;
}
else
{
if (ifInPolygon)
{
lineA = new Line();
lineA.P1 = p1;
lineA.P2 = p2;
q1 = pointList[pointList.Count - 1];
IPoint = new PointD();
for (k = 0; k < pointList.Count; k++)
{
q2 = pointList[k];
lineB = new Line();
lineB.P1 = q1;
lineB.P2 = q2;
if (IsLineSegmentCross(lineA, lineB))
{
IPoint = GetCrossPoint(lineA, lineB);
aEndPoint.sPoint = q1;
aEndPoint.Point = IPoint;
aEndPoint.Index = newLineList.Count;
_endPointList.Add(aEndPoint);
break;
}
q1 = q2;
}
newPlist.Add(IPoint);
bLine = new PolyLine();
bLine.Value = aValue;
bLine.Type = aType;
bLine.PointList = newPlist;
newLineList.Add(bLine);
ifInPolygon = false;
newPlist = new List<PointD>();
aType = "Border";
}
}
p1 = p2;
}
if (ifInPolygon && newPlist.Count > 1)
{
bLine = new PolyLine();
bLine.Value = aValue;
bLine.Type = aType;
bLine.PointList = newPlist;
newLineList.Add(bLine);
}
}
return newLineList;
}
/// <summary>
/// Smooth Polylines
/// </summary>
/// <param name="aLineList">Polyline list</param>
/// <returns>Polyline list after smoothing</returns>
public static List<PolyLine> SmoothLines(List<PolyLine> aLineList)
{
return SmoothLines(aLineList, 0.05f);
}
/// <summary>
/// Smooth Polylines
/// </summary>
/// <param name="aLineList">Polyline list</param>
/// <param name="step">B-Spline scan step (0 - 1)</param>
/// <returns>Polyline list after smoothing</returns>
public static List<PolyLine> SmoothLines(List<PolyLine> aLineList, float step)
{
List<PolyLine> newLineList = new List<PolyLine>();
int i;
PolyLine aline;
List<PointD> newPList = new List<PointD>();