public List <Node> GetNeighbors(Node iNode, bool iCrossCorners, bool iCrossAdjacentPoint)
{
int tX = iNode.x;
int tY = iNode.y;
List <Node> neighbors = new List <Node>();
bool tS0 = false, tD0 = false,
tS1 = false, tD1 = false,
tS2 = false, tD2 = false,
tS3 = false, tD3 = false;
GridPos pos = new GridPos();
if (this.IsWalkableAt(pos.Set(tX, tY - 1)))
{
neighbors.Add(GetNodeAt(pos));
tS0 = true;
}
if (this.IsWalkableAt(pos.Set(tX + 1, tY)))
{
neighbors.Add(GetNodeAt(pos));
tS1 = true;
}
if (this.IsWalkableAt(pos.Set(tX, tY + 1)))
{
neighbors.Add(GetNodeAt(pos));
tS2 = true;
}
if (this.IsWalkableAt(pos.Set(tX - 1, tY)))
{
neighbors.Add(GetNodeAt(pos));
tS3 = true;
}
if (iCrossCorners && iCrossAdjacentPoint)
{
tD0 = true;
tD1 = true;
tD2 = true;
tD3 = true;
}
else if (iCrossCorners)
{
tD0 = tS3 || tS0;
tD1 = tS0 || tS1;
tD2 = tS1 || tS2;
tD3 = tS2 || tS3;
}
else
{
tD0 = tS3 && tS0;
tD1 = tS0 && tS1;
tD2 = tS1 && tS2;
tD3 = tS2 && tS3;
}
if (tD0 && this.IsWalkableAt(pos.Set(tX - 1, tY - 1)))
{
neighbors.Add(GetNodeAt(pos));
}
if (tD1 && this.IsWalkableAt(pos.Set(tX + 1, tY - 1)))
{
neighbors.Add(GetNodeAt(pos));
}
if (tD2 && this.IsWalkableAt(pos.Set(tX + 1, tY + 1)))
{
neighbors.Add(GetNodeAt(pos));
}
if (tD3 && this.IsWalkableAt(pos.Set(tX - 1, tY + 1)))
{
neighbors.Add(GetNodeAt(pos));
}
return(neighbors);
}
public abstract bool IsWalkableAt(GridPos iPos);
public abstract bool SetWalkableAt(GridPos iPos, bool iWalkable);
private static GridPos?jumpLoop(JumpPointParam iParam, int iX, int iY, int iPx, int iPy)
{
GridPos?retVal = null;
Stack <JumpSnapshot> stack = new Stack <JumpSnapshot>();
JumpSnapshot currentSnapshot = new JumpSnapshot();
JumpSnapshot newSnapshot = null;
currentSnapshot.iX = iX;
currentSnapshot.iY = iY;
currentSnapshot.iPx = iPx;
currentSnapshot.iPy = iPy;
currentSnapshot.stage = 0;
stack.Push(currentSnapshot);
while (stack.Count != 0)
{
currentSnapshot = stack.Pop();
switch (currentSnapshot.stage)
{
case 0:
if (!iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY))
{
retVal = null;
continue;
}
else if (iParam.SearchGrid.GetNodeAt(currentSnapshot.iX, currentSnapshot.iY).Equals(iParam.EndNode))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
currentSnapshot.tDx = currentSnapshot.iX - currentSnapshot.iPx;
currentSnapshot.tDy = currentSnapshot.iY - currentSnapshot.iPy;
currentSnapshot.jx = null;
currentSnapshot.jy = null;
if (iParam.CrossCorner)
{
// check for forced neighbors
// along the diagonal
if (currentSnapshot.tDx != 0 && currentSnapshot.tDy != 0)
{
if ((iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - currentSnapshot.tDx, currentSnapshot.iY + currentSnapshot.tDy) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - currentSnapshot.tDx, currentSnapshot.iY)) ||
(iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY - currentSnapshot.tDy) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY - currentSnapshot.tDy)))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
}
// horizontally/vertically
else
{
if (currentSnapshot.tDx != 0)
{
// moving along x
if ((iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY + 1) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + 1)) ||
(iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY - 1) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY - 1)))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
}
else
{
if ((iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + 1, currentSnapshot.iY + currentSnapshot.tDy) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + 1, currentSnapshot.iY)) ||
(iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - 1, currentSnapshot.iY + currentSnapshot.tDy) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - 1, currentSnapshot.iY)))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
}
}
// when moving diagonally, must check for vertical/horizontal jump points
if (currentSnapshot.tDx != 0 && currentSnapshot.tDy != 0)
{
currentSnapshot.stage = 1;
stack.Push(currentSnapshot);
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
// moving diagonally, must make sure one of the vertical/horizontal
// neighbors is open to allow the path
// moving diagonally, must make sure one of the vertical/horizontal
// neighbors is open to allow the path
if (iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY) || iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + currentSnapshot.tDy))
{
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
else if (iParam.CrossAdjacentPoint)
{
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
}
else //if (!iParam.CrossCorner)
{
// check for forced neighbors
// along the diagonal
if (currentSnapshot.tDx != 0 && currentSnapshot.tDy != 0)
{
if ((iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY + currentSnapshot.tDy) && iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + currentSnapshot.tDy) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY)) ||
(iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY + currentSnapshot.tDy) && iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + currentSnapshot.tDy)))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
}
// horizontally/vertically
else
{
if (currentSnapshot.tDx != 0)
{
// moving along x
if ((iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + 1) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - currentSnapshot.tDx, currentSnapshot.iY + 1)) ||
(iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY - 1) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - currentSnapshot.tDx, currentSnapshot.iY - 1)))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
}
else
{
if ((iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + 1, currentSnapshot.iY) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + 1, currentSnapshot.iY - currentSnapshot.tDy)) ||
(iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - 1, currentSnapshot.iY) && !iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX - 1, currentSnapshot.iY - currentSnapshot.tDy)))
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
}
}
// when moving diagonally, must check for vertical/horizontal jump points
if (currentSnapshot.tDx != 0 && currentSnapshot.tDy != 0)
{
currentSnapshot.stage = 3;
stack.Push(currentSnapshot);
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
// moving diagonally, must make sure both of the vertical/horizontal
// neighbors is open to allow the path
if (iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY) && iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + currentSnapshot.tDy))
{
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
}
retVal = null;
break;
case 1:
currentSnapshot.jx = retVal;
currentSnapshot.stage = 2;
stack.Push(currentSnapshot);
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
break;
case 2:
currentSnapshot.jy = retVal;
if (currentSnapshot.jx != null || currentSnapshot.jy != null)
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
// moving diagonally, must make sure one of the vertical/horizontal
// neighbors is open to allow the path
if (iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY) || iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + currentSnapshot.tDy))
{
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
else if (iParam.CrossAdjacentPoint)
{
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
retVal = null;
break;
case 3:
currentSnapshot.jx = retVal;
currentSnapshot.stage = 4;
stack.Push(currentSnapshot);
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
break;
case 4:
currentSnapshot.jy = retVal;
if (currentSnapshot.jx != null || currentSnapshot.jy != null)
{
retVal = new GridPos(currentSnapshot.iX, currentSnapshot.iY);
continue;
}
// moving diagonally, must make sure both of the vertical/horizontal
// neighbors is open to allow the path
if (iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX + currentSnapshot.tDx, currentSnapshot.iY) && iParam.SearchGrid.IsWalkableAt(currentSnapshot.iX, currentSnapshot.iY + currentSnapshot.tDy))
{
newSnapshot = new JumpSnapshot();
newSnapshot.iX = currentSnapshot.iX + currentSnapshot.tDx;
newSnapshot.iY = currentSnapshot.iY + currentSnapshot.tDy;
newSnapshot.iPx = currentSnapshot.iX;
newSnapshot.iPy = currentSnapshot.iY;
newSnapshot.stage = 0;
stack.Push(newSnapshot);
continue;
}
retVal = null;
break;
}
}
return(retVal);
}
public abstract Node GetNodeAt(GridPos iPos);
public override bool IsWalkableAt(int iX, int iY)
{
GridPos pos = new GridPos(iX, iY);
return(IsWalkableAt(pos));
}
public override Node GetNodeAt(int iX, int iY)
{
GridPos pos = new GridPos(iX, iY);
return(GetNodeAt(pos));
}
public override bool SetWalkableAt(GridPos iPos, bool iWalkable)
{
return(SetWalkableAt(iPos.x, iPos.y, iWalkable));
}
public override bool IsWalkableAt(GridPos iPos)
{
return(m_nodePool.Nodes.ContainsKey(iPos));
}
public override Node GetNodeAt(GridPos iPos)
{
return(m_nodePool.GetNode(iPos));
}