/// <summary>
/// Adds a new polygon ONLY if there is a unifications.
/// Assumes current set is distinct.
/// </summary>
/// <param name="pPoly">The polygon to add if there is a union.</param>
public bool AddIfUnify(C2DHoledPolyBase pPoly)
{
var TempSet = new C2DHoledPolyBaseSet();
var UnionSet = new C2DHoledPolyBaseSet();
var grid = new CGrid();
while (Count > 0 && pPoly != null)
{
var pLast = this[Count - 1];
this.RemoveAt(Count - 1);
pLast.GetUnion(pPoly, UnionSet, grid);
if (UnionSet.Count == 1)
{
pPoly = null;
pLast = null;
AddAndUnify(UnionSet[0]);
UnionSet.Clear();
}
else
{
//Debug.Assert(UnionSet.Count == 0);
UnionSet.Clear();
TempSet.Add(pLast);
}
}
this.AddRange(TempSet);
TempSet.Clear();
return(pPoly == null);
}
/// <summary>
/// Adds a new polygon set and looks for a possible unifications.
/// Assumes both sets are distinct.
/// </summary>
/// <param name="pOther">The polygon set to add and possible unify.</param>
public void AddAndUnify(C2DHoledPolyBaseSet pOther)
{
var TempSet = new C2DHoledPolyBaseSet();
while (pOther.Count > 0)
{
var pLast = pOther[pOther.Count - 1];
pOther.RemoveAt(pOther.Count - 1);
if (!AddIfUnify(pLast))
{
TempSet.Add(pLast);
}
}
this.AddRange(TempSet);
}
/// <summary>
/// Basic multiple unification.
/// </summary>
public void UnifyBasic()
{
var TempSet = new C2DHoledPolyBaseSet();
var UnionSet = new C2DHoledPolyBaseSet();
while (Count > 0)
{
var pLast = this[Count - 1];
this.RemoveAt(Count - 1);
var bIntersect = false;
var i = 0;
while (i < Count && !bIntersect)
{
var grid = new CGrid();
this[i].GetUnion(pLast, UnionSet, grid);
if (UnionSet.Count == 1)
{
this[i] = UnionSet[0];
bIntersect = true;
}
else
{
//Debug.Assert(UnionSet.Count == 0);
UnionSet.Clear();
i++;
}
}
if (!bIntersect)
{
TempSet.Add(pLast);
}
}
this.AddRange(TempSet);
}
/// <summary>
/// Gets the boolean operation with the other. e.g. union / intersection.
/// </summary>
/// <param name="Other">The other polygon.</param>
/// <param name="HoledPolys">The set to recieve the result.</param>
/// <param name="bThisInside">The flag to indicate routes inside.</param>
/// <param name="bOtherInside">The flag to indicate routes inside for the other.</param>
/// <param name="grid">The degenerate settings.</param>
public void GetBoolean(C2DPolyBase Other, List <C2DHoledPolyBase> HoledPolys,
bool bThisInside, bool bOtherInside,
CGrid grid)
{
if (BoundingRect.Overlaps(Other.BoundingRect))
{
switch (grid.DegenerateHandling)
{
case CGrid.eDegenerateHandling.None:
{
var Routes1 = new C2DLineBaseSetSet();
var Routes2 = new C2DLineBaseSetSet();
C2DPolyBase.GetRoutes(this, bThisInside, Other, bOtherInside, Routes1, Routes2);
Routes1.ExtractAllOf(Routes2);
if (Routes1.Count > 0)
{
// Add all the joining routes together to form closed routes
Routes1.MergeJoining();
// Set up some temporary polygons.
var Polygons = new List <C2DPolyBase>();
// Turn the routes into polygons.
for (var i = Routes1.Count - 1; i >= 0; i--)
{
if (Routes1[i].IsClosed(true) && Routes1[i].Count > 2)
{
Polygons.Add(new C2DPolyBase());
Polygons[Polygons.Count - 1].CreateDirect(Routes1[i]);
}
else
{
// Debug.Assert(false);
grid.LogDegenerateError();
}
}
// Set up some temporary holed polygons
var NewComPolys = new C2DHoledPolyBaseSet();
// Turn the set of polygons into holed polygons. Not needed for intersection.
if (!(bThisInside && bOtherInside))
{
C2DHoledPolyBase.PolygonsToHoledPolygons(NewComPolys, Polygons);
if (NewComPolys.Count != 1)
{
// Debug.Assert(false);
grid.LogDegenerateError();
}
}
else
{
for (var i = 0; i < Polygons.Count; i++)
{
HoledPolys.Add(new C2DHoledPolyBase(Polygons[i]));
}
}
// Now add them all to the provided set.
for (var i = 0; i < NewComPolys.Count; i++)
{
HoledPolys.Add(NewComPolys[i]);
}
}
}
break;
case CGrid.eDegenerateHandling.RandomPerturbation:
{
var OtherCopy = new C2DPolyBase(Other);
OtherCopy.RandomPerturb();
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
GetBoolean(OtherCopy, HoledPolys, bThisInside, bOtherInside, grid);
grid.DegenerateHandling = CGrid.eDegenerateHandling.RandomPerturbation;
}
break;
case CGrid.eDegenerateHandling.DynamicGrid:
{
var Rect = new C2DRect();
if (this.BoundingRect.Overlaps(Other.BoundingRect, Rect))
{
var dOldGrid = grid.GridSize;
grid.SetToMinGridSize(Rect, false);
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGrid;
GetBoolean(Other, HoledPolys, bThisInside, bOtherInside, grid);
grid.DegenerateHandling = CGrid.eDegenerateHandling.DynamicGrid;
}
}
break;
case CGrid.eDegenerateHandling.PreDefinedGrid:
{
var P1 = new C2DPolyBase(this);
var P2 = new C2DPolyBase(Other);
P1.SnapToGrid(grid);
P2.SnapToGrid(grid);
var V1 = new C2DVector(P1.BoundingRect.TopLeft, P2.BoundingRect.TopLeft);
var dPerturbation = grid.GridSize; // ensure it snaps back to original grid positions.
if (V1.i > 0)
{
V1.i = dPerturbation;
}
else
{
V1.i = -dPerturbation; // move away slightly if possible
}
if (V1.j > 0)
{
V1.j = dPerturbation;
}
else
{
V1.j = -dPerturbation; // move away slightly if possible
}
V1.i *= 0.411923; // ensure it snaps back to original grid positions.
V1.j *= 0.313131; // ensure it snaps back to original grid positions.
P2.Move(V1);
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
P1.GetBoolean(P2, HoledPolys, bThisInside, bOtherInside, grid);
for (var i = 0; i < HoledPolys.Count; i++)
{
HoledPolys[i].SnapToGrid(grid);
}
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGrid;
}
break;
case CGrid.eDegenerateHandling.PreDefinedGridPreSnapped:
{
var P2 = new C2DPolyBase(Other);
var V1 = new C2DVector(this.BoundingRect.TopLeft, P2.BoundingRect.TopLeft);
var dPerturbation = grid.GridSize; // ensure it snaps back to original grid positions.
if (V1.i > 0)
{
V1.i = dPerturbation;
}
else
{
V1.i = -dPerturbation; // move away slightly if possible
}
if (V1.j > 0)
{
V1.j = dPerturbation;
}
else
{
V1.j = -dPerturbation; // move away slightly if possible
}
V1.i *= 0.411923; // ensure it snaps back to original grid positions.
V1.j *= 0.313131; // ensure it snaps back to original grid positions.
P2.Move(V1);
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
GetBoolean(P2, HoledPolys, bThisInside, bOtherInside, grid);
for (var i = 0; i < HoledPolys.Count; i++)
{
HoledPolys[i].SnapToGrid(grid);
}
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGridPreSnapped;
}
break;
}
}
}
/// <summary>
/// Unification by growing shapes of fairly equal size (fastest for large groups).
/// </summary>
/// <param name="grid">The CGrid with the degenerate settings.</param>
public void UnifyProgressive(CGrid grid)
{
// Record the degenerate handling so we can reset.
CGrid.eDegenerateHandling DegenerateHandling = grid.DegenerateHandling;
switch (grid.DegenerateHandling)
{
case CGrid.eDegenerateHandling.RandomPerturbation:
for (var i = 0; i < Count; i++)
{
this[i].RandomPerturb();
}
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
break;
case CGrid.eDegenerateHandling.DynamicGrid:
break;
case CGrid.eDegenerateHandling.PreDefinedGrid:
for (var i = 0; i < Count; i++)
{
this[i].SnapToGrid(grid);
}
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGridPreSnapped;
break;
case CGrid.eDegenerateHandling.PreDefinedGridPreSnapped:
break;
}
var NoUnionSet = new C2DHoledPolyBaseSet();
var PossUnionSet = new C2DHoledPolyBaseSet();
var SizeHoldSet = new C2DHoledPolyBaseSet();
var UnionSet = new C2DHoledPolyBaseSet();
var TempSet = new C2DHoledPolyBaseSet();
var nThreshold = GetMinLineCount();
if (nThreshold == 0)
{
nThreshold = 10; // avoid infinate loop.
}
// Assumed all are size held to start
SizeHoldSet.AddRange(this);
this.Clear();
do
{
// double the threshold
nThreshold *= 3;
// Put all the possible intersects back in this.
this.AddRange(PossUnionSet);
PossUnionSet.Clear();
// Put all the size held that are small enough back (or in to start with)
while (SizeHoldSet.Count > 0)
{
var pLast = SizeHoldSet[SizeHoldSet.Count - 1];
SizeHoldSet.RemoveAt(SizeHoldSet.Count - 1);
if (pLast.GetLineCount() > nThreshold)
{
TempSet.Add(pLast);
}
else
{
this.Add(pLast);
}
}
SizeHoldSet.AddRange(TempSet);
TempSet.Clear();
// Cycle through all popping the last and finding a union
while (Count > 0)
{
var pLast = this[Count - 1];
this.RemoveAt(Count - 1);
var bIntersect = false;
var i = 0;
while (i < Count && !bIntersect)
{
this[i].GetUnion(pLast, UnionSet, grid);
if (UnionSet.Count == 1)
{
var pUnion = UnionSet[UnionSet.Count - 1];
UnionSet.RemoveAt(UnionSet.Count - 1);
if (pUnion.GetLineCount() > nThreshold)
{
RemoveAt(i);
SizeHoldSet.Add(pUnion);
}
else
{
this[i] = pUnion;
i++;
}
bIntersect = true;
}
else
{
if (UnionSet.Count != 0)
{
grid.LogDegenerateError();
}
UnionSet.Clear();
i++;
}
}
if (!bIntersect)
{
var bPosInterSect = false;
for (var j = 0; j < SizeHoldSet.Count; j++)
{
if (pLast.Rim.BoundingRect.Overlaps(
SizeHoldSet[j].Rim.BoundingRect))
{
bPosInterSect = true;
break;
}
}
if (bPosInterSect)
{
PossUnionSet.Add(pLast);
}
else
{
NoUnionSet.Add(pLast);
}
}
}
}while (SizeHoldSet.Count != 0);
this.AddRange(NoUnionSet);
NoUnionSet.Clear();
grid.DegenerateHandling = DegenerateHandling;
}
/// <summary>
/// Returns the boolean result (e.g. union) of 2 shapes. Boolean Operation defined by
/// the inside / outside flags.
/// </summary>
/// <param name="Other">Other polygon.</param>
/// <param name="HoledPolys">Set of polygons to recieve the result.</param>
/// <param name="bThisInside">Does the operation require elements of this INSIDE the other.</param>
/// <param name="bOtherInside">Does the operation require elements of the other INSIDE this.</param>
/// <param name="grid">The grid with the degenerate settings.</param>
public void GetBoolean(C2DHoledPolyBase Other, List <C2DHoledPolyBase> HoledPolys,
bool bThisInside, bool bOtherInside,
CGrid grid)
{
if (_Rim.Lines.Count == 0 || Other.Rim.Lines.Count == 0)
{
return;
}
if (_Rim.BoundingRect.Overlaps(Other.Rim.BoundingRect))
{
switch (grid.DegenerateHandling)
{
case CGrid.eDegenerateHandling.None:
{
var CompleteHoles1 = new List <C2DPolyBase>();
var CompleteHoles2 = new List <C2DPolyBase>();
var Routes1 = new C2DLineBaseSetSet();
var Routes2 = new C2DLineBaseSetSet();
GetRoutes(this, bThisInside, Other, bOtherInside, Routes1, Routes2,
CompleteHoles1, CompleteHoles2, grid);
Routes1.ExtractAllOf(Routes2);
if (Routes1.Count > 0)
{
Routes1.MergeJoining();
var Polygons = new List <C2DPolyBase>();
for (var i = Routes1.Count - 1; i >= 0; i--)
{
C2DLineBaseSet pRoute = Routes1[i];
if (pRoute.IsClosed(true))
{
Polygons.Add(new C2DPolyBase());
Polygons[Polygons.Count - 1].CreateDirect(pRoute);
}
else
{
// Debug.Assert(false);
grid.LogDegenerateError();
}
}
var NewComPolys = new C2DHoledPolyBaseSet();
PolygonsToHoledPolygons(NewComPolys, Polygons);
NewComPolys.AddKnownHoles(CompleteHoles1);
NewComPolys.AddKnownHoles(CompleteHoles2);
if (!bThisInside && !bOtherInside && NewComPolys.Count != 1)
{
// Debug.Assert(false);
grid.LogDegenerateError();
}
HoledPolys.AddRange(NewComPolys);
NewComPolys.Clear();
}
}
break;
case CGrid.eDegenerateHandling.RandomPerturbation:
{
var OtherCopy = new C2DHoledPolyBase(Other);
OtherCopy.RandomPerturb();
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
GetBoolean(OtherCopy, HoledPolys, bThisInside, bOtherInside, grid);
grid.DegenerateHandling = CGrid.eDegenerateHandling.RandomPerturbation;
}
break;
case CGrid.eDegenerateHandling.DynamicGrid:
{
var Rect = new C2DRect();
if (_Rim.BoundingRect.Overlaps(Other.Rim.BoundingRect, Rect))
{
//double dOldGrid = CGrid::GetGridSize();
grid.SetToMinGridSize(Rect, false);
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGrid;
GetBoolean(Other, HoledPolys, bThisInside, bOtherInside, grid);
grid.DegenerateHandling = CGrid.eDegenerateHandling.DynamicGrid;
}
}
break;
case CGrid.eDegenerateHandling.PreDefinedGrid:
{
var P1 = new C2DHoledPolyBase(this);
var P2 = new C2DHoledPolyBase(Other);
P1.SnapToGrid(grid);
P2.SnapToGrid(grid);
var V1 = new C2DVector(P1.Rim.BoundingRect.TopLeft, P2.Rim.BoundingRect.TopLeft);
var dPerturbation = grid.GridSize; // ensure it snaps back to original grid positions.
if (V1.i > 0)
{
V1.i = dPerturbation;
}
else
{
V1.i = -dPerturbation; // move away slightly if possible
}
if (V1.j > 0)
{
V1.j = dPerturbation;
}
else
{
V1.j = -dPerturbation; // move away slightly if possible
}
V1.i *= 0.411923; // ensure it snaps back to original grid positions.
V1.j *= 0.313131; // ensure it snaps back to original grid positions.
P2.Move(V1);
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
P1.GetBoolean(P2, HoledPolys, bThisInside, bOtherInside, grid);
for (var i = 0; i < HoledPolys.Count; i++)
{
HoledPolys[i].SnapToGrid(grid);
}
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGrid;
}
break;
case CGrid.eDegenerateHandling.PreDefinedGridPreSnapped:
{
var P2 = new C2DHoledPolyBase(Other);
var V1 = new C2DVector(_Rim.BoundingRect.TopLeft, P2.Rim.BoundingRect.TopLeft);
var dPerturbation = grid.GridSize;
if (V1.i > 0)
{
V1.i = dPerturbation;
}
else
{
V1.i = -dPerturbation; // move away slightly if possible
}
if (V1.j > 0)
{
V1.j = dPerturbation;
}
else
{
V1.j = -dPerturbation; // move away slightly if possible
}
V1.i *= 0.411923; // ensure it snaps back to original grid positions.
V1.j *= 0.313131; // ensure it snaps back to original grid positions.
P2.Move(V1);
grid.DegenerateHandling = CGrid.eDegenerateHandling.None;
GetBoolean(P2, HoledPolys, bThisInside, bOtherInside, grid);
for (var i = 0; i < HoledPolys.Count; i++)
{
HoledPolys[i].SnapToGrid(grid);
}
grid.DegenerateHandling = CGrid.eDegenerateHandling.PreDefinedGridPreSnapped;
}
break;
} // switch
}
}
