//________________________________________________________________________
internal bool Fill(PointSpeedBuffer source)
{
if (source == null)
{
this.m_Count = 0;
return(true);
}
int iCount = source.Count;
if (iCount <= 0)
{
this.m_Count = 0;
return(true);
}
if (iCount > this.m_Capacity)
{
return(false);
}
this.m_Count = iCount;
System.Array.Copy(source.m_Buffer, 0, this.m_Buffer, 0, this.m_Count);
return(true);
}
//________________________________________________________________________
internal void SetAll(PointSpeedBuffer list, CellType value)
{
if (list == null)
{
return;
}
int index = list.Count;
while (--index >= 0)
{
var pt = list.m_Buffer[index];
this.m_Buffer[pt.Row, pt.Column] = value;
}
}
//________________________________________________________________________
private static int FindNextPoint(Matrix matrix, PointSpeedBuffer buffer, Point end, int index, bool first)
{
if ((index + 1) >= buffer.m_Capacity)
{
return(-1);
}
PointSide side = PointSide.None;
Point point = buffer.m_Buffer[index];
Point back = buffer.m_Buffer[index - 1];
Point next;
//-----
if (first)
{
//For speed.
next = point; --next.Row; //Top
if ((next != back) && (buffer.IndexOf(next) >= 0))
{
return(-1);
}
if (next == end)
{
buffer.m_Buffer[index + 1] = next;
return(+1);
}
next = point; ++next.Column; //Right
if ((next != back) && (buffer.IndexOf(next) >= 0))
{
return(-1);
}
if (next == end)
{
buffer.m_Buffer[index + 1] = next;
return(+1);
}
next = point; ++next.Row; //Bottom
if ((next != back) && (buffer.IndexOf(next) >= 0))
{
return(-1);
}
if (next == end)
{
buffer.m_Buffer[index + 1] = next;
return(+1);
}
next = point; --next.Column; //Left
if ((next != back) && (buffer.IndexOf(next) >= 0))
{
return(-1);
}
if (next == end)
{
buffer.m_Buffer[index + 1] = next;
return(+1);
}
}
else
{
next = buffer.m_Buffer[index + 1];
if (point.Column == next.Column)
{
if ((point.Row - 1) == next.Row)
{
side = PointSide.Top;
}
else if ((point.Row + 1) == next.Row)
{
side = PointSide.Bottom;
}
}
else if (point.Row == next.Row)
{
if ((point.Column - 1) == next.Column)
{
side = PointSide.Left;
}
else if ((point.Column + 1) == next.Column)
{
side = PointSide.Right;
}
}
#if (DEBUG)
if (side == PointSide.None)
{
System.Diagnostics.Debugger.Break();
}
#endif
}
//-----Goto next point ...
byte maxRow = (byte)(matrix.m_Size.Row - 2);
byte maxCol = (byte)(matrix.m_Size.Column - 2);
while (true)
{
++side;
next = point.GetSidePoint(side);
if (next == point)
{
return(-1); //side != Top|Right|Bottom|Left
}
//-----Range test ...
if ((next.Row <= 0) || (next.Column <= 0) || (next.Row > maxRow) || (next.Column > maxCol))
{
continue;
}
//-----Is fix ...
if (matrix.m_Buffer[next.Row, next.Column] == CellType.Fix)
{
continue;
}
//-----Exist test ...
if (next == back)
{
continue;
}
#if (DEBUG)
if (buffer.IndexOf(next) >= 0)
{
System.Diagnostics.Debugger.Break();
}
#endif
//----Next point finded ...
buffer.m_Buffer[index + 1] = next;
return(+1);
}
}
//________________________________________________________________________
private void AsyncStart(object state)
{
PointSpeedBuffer pathMin = null;
long version = (long)state;
try
{
if (this.m_Version != version)
{
return;
}
//-----Validation ...
if ((this.m_Matrix.m_Size.Row <= 2) || (this.m_Matrix.m_Size.Column <= 2))
{
return;
}
//-----Find start and end point ...
Point ptStart, ptEnd;
Point ptStartInside, ptEndInside; //For speed.
if (!FindInputAndOutputPoints(this.m_Matrix, out ptStart, out ptStartInside, out ptEnd, out ptEndInside))
{
return;
}
//-----Initialize ....
pathMin = new PointSpeedBuffer((this.m_Matrix.m_Size.Column - 2) * (this.m_Matrix.m_Size.Row - 2));
if ((ptStart == ptEndInside) || (ptStartInside == ptEnd))
{
pathMin.m_Buffer[pathMin.m_Count++] = ptStart;
pathMin.m_Buffer[pathMin.m_Count++] = ptEnd;
return;
}
var matrix = new Matrix(this.m_Matrix);
matrix.ClearWay();
//-----Remove close points. Only for speed and performance.
RemoveClosePoints_Pass1(matrix);
if (
(matrix.m_Buffer[ptStartInside.Row, ptStartInside.Column] == CellType.Fix) ||
(matrix.m_Buffer[ptEndInside.Row, ptEndInside.Column] == CellType.Fix)
)
{
pathMin = null;
return;
}
//-----
var pathCur = new PointSpeedBuffer((this.m_Matrix.m_Size.Column - 2) * (this.m_Matrix.m_Size.Row - 2));
pathMin.m_Count = int.MaxValue;
pathCur.m_Buffer[pathCur.m_Count++] = ptStart;
pathCur.m_Buffer[pathCur.m_Count++] = ptStartInside;
//-----Start ....
--pathCur.m_Count;
int iFront = 1;
while (true)
{
if (this.m_Version != version)
{
return;
}
if (this.m_DebugMode)
{
this.OnResult(new ResultEventArgs(pathCur, false));
System.Threading.Thread.Sleep(SLEEPINDEBUGMODE);
}
if (iFront > 0)
{
++pathCur.m_Count;
}
else
{
pathCur.m_Count += iFront;
if (pathCur.m_Count <= 1)
{
break;
}
}
iFront = FindNextPoint(matrix, pathCur, ptEndInside, pathCur.m_Count - 1, iFront > 0);
if (iFront > 0)
{
if (pathCur.m_Buffer[pathCur.m_Count] == ptEndInside) //Found a true path?
{
if (pathCur.m_Count < (pathCur.m_Capacity - 2))
{
++pathCur.m_Count;
pathCur.m_Buffer[pathCur.m_Count++] = ptEnd;
if (pathCur.m_Count < pathMin.m_Count)
{
pathMin.Fill(pathCur);
this.OnResult(new ResultEventArgs(pathMin, false));
}
if (pathCur.m_Count <= 5)
{
break;
}
iFront = -3;
}
else
{
iFront = -1;
}
}
else
{
iFront = +1;
}
}
else if (pathCur.m_Count <= 2)
{
break;
}
}
}
catch
{
if (System.Threading.Interlocked.Read(ref this.m_Version) != version)
{
return;
}
pathMin = null;
#if (DEBUG)
System.Diagnostics.Debugger.Break();
#endif
}
finally
{
if (System.Threading.Interlocked.Read(ref this.m_Version) == version)
{
if ((pathMin == null) || (pathMin.m_Count <= 1) || (pathMin.m_Count > pathMin.m_Capacity))
{
//-----Not found ...
this.OnResult(new ResultEventArgs(null, true));
}
else
{
//-----Found ...
this.OnResult(new ResultEventArgs(pathMin, true));
}
}
}
}