private static void combLeft(ref MarchingSquares.GeomPoly polya, ref MarchingSquares.GeomPoly polyb)
{
MarchingSquares.CxFastList <TSVector2> points = polya.Points;
MarchingSquares.CxFastList <TSVector2> points2 = polyb.Points;
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode = points.Begin();
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode2 = points2.Begin();
TSVector2 tSVector = cxFastListNode2.Elem();
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode3 = null;
while (cxFastListNode != points.End())
{
TSVector2 tSVector2 = cxFastListNode.Elem();
bool flag = MarchingSquares.VecDsq(tSVector2, tSVector) < Settings.Epsilon;
if (flag)
{
bool flag2 = cxFastListNode3 != null;
if (flag2)
{
TSVector2 value = cxFastListNode3.Elem();
tSVector = cxFastListNode2.Next().Elem();
TSVector2 a = tSVector2 - value;
TSVector2 b = tSVector - tSVector2;
FP fP = MarchingSquares.VecCross(a, b);
bool flag3 = fP * fP < Settings.Epsilon;
if (flag3)
{
points.Erase(cxFastListNode3, cxFastListNode);
polya.Length--;
cxFastListNode = cxFastListNode3;
}
}
bool flag4 = true;
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode4 = null;
while (!points2.Empty())
{
TSVector2 value2 = points2.Front();
points2.Pop();
bool flag5 = !flag4 && !points2.Empty();
if (flag5)
{
cxFastListNode = points.Insert(cxFastListNode, value2);
polya.Length++;
cxFastListNode4 = cxFastListNode;
}
flag4 = false;
}
cxFastListNode = cxFastListNode.Next();
TSVector2 tSVector3 = cxFastListNode.Elem();
cxFastListNode = cxFastListNode.Next();
bool flag6 = cxFastListNode == points.End();
if (flag6)
{
cxFastListNode = points.Begin();
}
TSVector2 value3 = cxFastListNode.Elem();
TSVector2 value4 = cxFastListNode4.Elem();
TSVector2 a2 = tSVector3 - value4;
TSVector2 b2 = value3 - tSVector3;
FP fP2 = MarchingSquares.VecCross(a2, b2);
bool flag7 = fP2 * fP2 < Settings.Epsilon;
if (flag7)
{
points.Erase(cxFastListNode4, cxFastListNode4.Next());
polya.Length--;
}
break;
}
cxFastListNode3 = cxFastListNode;
cxFastListNode = cxFastListNode.Next();
}
}
public static List <Vertices> DetectSquares(AABB domain, FP cellWidth, FP cellHeight, sbyte[,] f, int lerpCount, bool combine)
{
MarchingSquares.CxFastList <MarchingSquares.GeomPoly> cxFastList = new MarchingSquares.CxFastList <MarchingSquares.GeomPoly>();
List <Vertices> list = new List <Vertices>();
int num = (int)((long)(domain.Extents.x * 2 / cellWidth));
bool flag = num == domain.Extents.x * 2 / cellWidth;
int num2 = (int)((long)(domain.Extents.y * 2 / cellHeight));
bool flag2 = num2 == domain.Extents.y * 2 / cellHeight;
bool flag3 = !flag;
if (flag3)
{
num++;
}
bool flag4 = !flag2;
if (flag4)
{
num2++;
}
sbyte[,] array = new sbyte[num + 1, num2 + 1];
MarchingSquares.GeomPolyVal[,] array2 = new MarchingSquares.GeomPolyVal[num + 1, num2 + 1];
for (int i = 0; i < num + 1; i++)
{
bool flag5 = i == num;
int num3;
if (flag5)
{
num3 = (int)((long)domain.UpperBound.x);
}
else
{
num3 = (int)((long)(i * cellWidth + domain.LowerBound.x));
}
for (int j = 0; j < num2 + 1; j++)
{
bool flag6 = j == num2;
int num4;
if (flag6)
{
num4 = (int)((long)domain.UpperBound.y);
}
else
{
num4 = (int)((long)(j * cellHeight + domain.LowerBound.y));
}
array[i, j] = f[num3, num4];
}
}
for (int k = 0; k < num2; k++)
{
FP fP = k * cellHeight + domain.LowerBound.y;
bool flag7 = k == num2 - 1;
FP y;
if (flag7)
{
y = domain.UpperBound.y;
}
else
{
y = fP + cellHeight;
}
MarchingSquares.GeomPoly geomPoly = null;
for (int l = 0; l < num; l++)
{
FP fP2 = l * cellWidth + domain.LowerBound.x;
bool flag8 = l == num - 1;
FP x;
if (flag8)
{
x = domain.UpperBound.x;
}
else
{
x = fP2 + cellWidth;
}
MarchingSquares.GeomPoly geomPoly2 = new MarchingSquares.GeomPoly();
int num5 = MarchingSquares.MarchSquare(f, array, ref geomPoly2, l, k, fP2, fP, x, y, lerpCount);
bool flag9 = geomPoly2.Length != 0;
if (flag9)
{
bool flag10 = combine && geomPoly != null && (num5 & 9) != 0;
if (flag10)
{
MarchingSquares.combLeft(ref geomPoly, ref geomPoly2);
geomPoly2 = geomPoly;
}
else
{
cxFastList.Add(geomPoly2);
}
array2[l, k] = new MarchingSquares.GeomPolyVal(geomPoly2, num5);
}
else
{
geomPoly2 = null;
}
geomPoly = geomPoly2;
}
}
bool flag11 = !combine;
List <Vertices> result;
if (flag11)
{
List <MarchingSquares.GeomPoly> listOfElements = cxFastList.GetListOfElements();
foreach (MarchingSquares.GeomPoly current in listOfElements)
{
list.Add(new Vertices(current.Points.GetListOfElements()));
}
result = list;
}
else
{
for (int m = 1; m < num2; m++)
{
int n = 0;
while (n < num)
{
MarchingSquares.GeomPolyVal geomPolyVal = array2[n, m];
bool flag12 = geomPolyVal == null;
if (flag12)
{
n++;
}
else
{
bool flag13 = (geomPolyVal.Key & 12) == 0;
if (flag13)
{
n++;
}
else
{
MarchingSquares.GeomPolyVal geomPolyVal2 = array2[n, m - 1];
bool flag14 = geomPolyVal2 == null;
if (flag14)
{
n++;
}
else
{
bool flag15 = (geomPolyVal2.Key & 3) == 0;
if (flag15)
{
n++;
}
else
{
FP fP3 = n * cellWidth + domain.LowerBound.x;
FP y2 = m * cellHeight + domain.LowerBound.y;
MarchingSquares.CxFastList <TSVector2> points = geomPolyVal.GeomP.Points;
MarchingSquares.CxFastList <TSVector2> points2 = geomPolyVal2.GeomP.Points;
bool flag16 = geomPolyVal2.GeomP == geomPolyVal.GeomP;
if (flag16)
{
n++;
}
else
{
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode = points.Begin();
while (MarchingSquares.Square(cxFastListNode.Elem().y - y2) > Settings.Epsilon || cxFastListNode.Elem().x < fP3)
{
cxFastListNode = cxFastListNode.Next();
}
TSVector2 tSVector = cxFastListNode.Next().Elem();
bool flag17 = MarchingSquares.Square(tSVector.y - y2) > Settings.Epsilon;
if (flag17)
{
n++;
}
else
{
bool flag18 = true;
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode2;
for (cxFastListNode2 = points2.Begin(); cxFastListNode2 != points2.End(); cxFastListNode2 = cxFastListNode2.Next())
{
bool flag19 = MarchingSquares.VecDsq(cxFastListNode2.Elem(), tSVector) < Settings.Epsilon;
if (flag19)
{
flag18 = false;
break;
}
}
bool flag20 = flag18;
if (flag20)
{
n++;
}
else
{
MarchingSquares.CxFastListNode <TSVector2> cxFastListNode3 = cxFastListNode.Next().Next();
bool flag21 = cxFastListNode3 == points.End();
if (flag21)
{
cxFastListNode3 = points.Begin();
}
while (cxFastListNode3 != cxFastListNode)
{
cxFastListNode2 = points2.Insert(cxFastListNode2, cxFastListNode3.Elem());
cxFastListNode3 = cxFastListNode3.Next();
bool flag22 = cxFastListNode3 == points.End();
if (flag22)
{
cxFastListNode3 = points.Begin();
}
geomPolyVal2.GeomP.Length++;
}
fP3 = n + 1;
while (fP3 < num)
{
MarchingSquares.GeomPolyVal geomPolyVal3 = array2[(int)((long)fP3), m];
bool flag23 = geomPolyVal3 == null || geomPolyVal3.GeomP != geomPolyVal.GeomP;
if (flag23)
{
fP3 += 1;
}
else
{
geomPolyVal3.GeomP = geomPolyVal2.GeomP;
fP3 += 1;
}
}
fP3 = n - 1;
while (fP3 >= 0)
{
MarchingSquares.GeomPolyVal geomPolyVal4 = array2[(int)((long)fP3), m];
bool flag24 = geomPolyVal4 == null || geomPolyVal4.GeomP != geomPolyVal.GeomP;
if (flag24)
{
fP3 -= 1;
}
else
{
geomPolyVal4.GeomP = geomPolyVal2.GeomP;
fP3 -= 1;
}
}
cxFastList.Remove(geomPolyVal.GeomP);
geomPolyVal.GeomP = geomPolyVal2.GeomP;
n = (int)((long)((cxFastListNode.Next().Elem().x - domain.LowerBound.x) / cellWidth)) + 1;
}
}
}
}
}
}
}
}
}
List <MarchingSquares.GeomPoly> listOfElements = cxFastList.GetListOfElements();
foreach (MarchingSquares.GeomPoly current2 in listOfElements)
{
list.Add(new Vertices(current2.Points.GetListOfElements()));
}
result = list;
}
return(result);
}