public void LocalMinimaTest1()
{
int[,] matrix = new int[, ]
{
{ 8, 8, 10, 11 },
{ 9, 3, 6, 4 },
{ 10, 7, 12, 21 },
{ 15, 20, 11, 81 }
};
int res = LocalMinima.FindLocalMinimum(matrix);
int expected = 3;
Assert.AreEqual(expected, res);
}
internal static bool AddPath(this Clipper clipper, List <Vector2d> pg, PolyType polyType, float scale,
bool closed)
{
if (!closed)
{
throw new ClipperException("AddPath: Open paths have been disabled.");
}
int highI = pg.Count() - 1;
if (closed)
{
while (highI > 0 && (pg[highI] == pg[0]))
{
--highI;
}
}
while (highI > 0 && (pg[highI] == pg[highI - 1]))
{
--highI;
}
if ((closed && highI < 2) || (!closed && highI < 1))
{
return(false);
}
//create a new edge array ...
List <TEdge> edges = new List <TEdge>(highI + 1);
for (int i = 0; i <= highI; i++)
{
edges.Add(ClipperPool.AllocEdge());
}
bool IsFlat = true;
//1. Basic (first) edge initialization ...
var pg0 = new IntPoint(pg[0].X * scale, pg[0].Y * scale);
var pgHighI = new IntPoint(pg[highI].X * scale, pg[highI].Y * scale);
edges[1].Curr = new IntPoint(pg[1].X * scale, pg[1].Y * scale);
clipper.RangeTest(pg0, ref clipper.m_UseFullRange);
clipper.RangeTest(pgHighI, ref clipper.m_UseFullRange);
clipper.InitEdge(edges[0], edges[1], edges[highI], pg0);
clipper.InitEdge(edges[highI], edges[0], edges[highI - 1], pgHighI);
for (int i = highI - 1; i >= 1; --i)
{
var pgI = new IntPoint(pg[i].X * scale, pg[i].Y * scale);
clipper.RangeTest(pgI, ref clipper.m_UseFullRange);
clipper.InitEdge(edges[i], edges[i + 1], edges[i - 1], pgI);
}
TEdge eStart = edges[0];
//2. Remove duplicate vertices, and (when closed) collinear edges ...
TEdge E = eStart, eLoopStop = eStart;
for (;;)
{
//nb: allows matching start and end points when not Closed ...
if (E.Curr == E.Next.Curr && (closed || E.Next != eStart))
{
if (E == E.Next)
{
break;
}
if (E == eStart)
{
eStart = E.Next;
}
E = clipper.RemoveEdge(E);
eLoopStop = E;
continue;
}
if (E.Prev == E.Next)
{
break; //only two vertices
}
if (closed &&
ClipperBase.SlopesEqual(E.Prev.Curr, E.Curr, E.Next.Curr, clipper.m_UseFullRange) &&
(!clipper.PreserveCollinear ||
!clipper.Pt2IsBetweenPt1AndPt3(E.Prev.Curr, E.Curr, E.Next.Curr)))
{
//Collinear edges are allowed for open paths but in closed paths
//the default is to merge adjacent collinear edges into a single edge.
//However, if the PreserveCollinear property is enabled, only overlapping
//collinear edges (ie spikes) will be removed from closed paths.
if (E == eStart)
{
eStart = E.Next;
}
E = clipper.RemoveEdge(E);
E = E.Prev;
eLoopStop = E;
continue;
}
E = E.Next;
if ((E == eLoopStop) || (!closed && E.Next == eStart))
{
break;
}
}
if ((!closed && (E == E.Next)) || (closed && (E.Prev == E.Next)))
{
return(false);
}
//3. Do second stage of edge initialization ...
E = eStart;
do
{
clipper.InitEdge2(E, polyType);
E = E.Next;
if (IsFlat && E.Curr.Y != eStart.Curr.Y)
{
IsFlat = false;
}
} while (E != eStart);
//4. Finally, add edge bounds to LocalMinima list ...
//Totally flat paths must be handled differently when adding them
//to LocalMinima list to avoid endless loops etc ...
if (IsFlat)
{
if (closed)
{
return(false);
}
}
clipper.m_edges.Add(edges);
bool leftBoundIsForward;
TEdge EMin = null;
//workaround to avoid an endless loop in the while loop below when
//open paths have matching start and end points ...
if (E.Prev.Bot == E.Prev.Top)
{
E = E.Next;
}
for (;;)
{
E = clipper.FindNextLocMin(E);
if (E == EMin)
{
break;
}
if (EMin == null)
{
EMin = E;
}
//E and E.Prev now share a local minima (left aligned if horizontal).
//Compare their slopes to find which starts which bound ...
LocalMinima locMin = new LocalMinima();
locMin.Next = null;
locMin.Y = E.Bot.Y;
if (E.Dx < E.Prev.Dx)
{
locMin.LeftBound = E.Prev;
locMin.RightBound = E;
leftBoundIsForward = false; //Q.nextInLML = Q.prev
}
else
{
locMin.LeftBound = E;
locMin.RightBound = E.Prev;
leftBoundIsForward = true; //Q.nextInLML = Q.next
}
locMin.LeftBound.Side = EdgeSide.esLeft;
locMin.RightBound.Side = EdgeSide.esRight;
if (locMin.LeftBound.Next == locMin.RightBound)
{
locMin.LeftBound.WindDelta = -1;
}
else
{
locMin.LeftBound.WindDelta = 1;
}
locMin.RightBound.WindDelta = -locMin.LeftBound.WindDelta;
E = clipper.ProcessBound(locMin.LeftBound, leftBoundIsForward);
if (E.OutIdx == ClipperBase.Skip)
{
E = clipper.ProcessBound(E, leftBoundIsForward);
}
TEdge E2 = clipper.ProcessBound(locMin.RightBound, !leftBoundIsForward);
if (E2.OutIdx == ClipperBase.Skip)
{
E2 = clipper.ProcessBound(E2, !leftBoundIsForward);
}
if (locMin.LeftBound.OutIdx == ClipperBase.Skip)
{
locMin.LeftBound = null;
}
else if (locMin.RightBound.OutIdx == ClipperBase.Skip)
{
locMin.RightBound = null;
}
clipper.InsertLocalMinima(locMin);
if (!leftBoundIsForward)
{
E = E2;
}
}
return(true);
}