/// <summary>
/// when connecting a plotcommit to the child make sure that you will not be
/// located on a lane on which a passed commit is located on.
/// </summary>
/// <remarks>
/// when connecting a plotcommit to the child make sure that you will not be
/// located on a lane on which a passed commit is located on. Otherwise we
/// would have to draw a line through a commit.
/// </remarks>
/// <param name="index"></param>
/// <param name="commit"></param>
/// <param name="nChildren"></param>
private void HandleBlockedLanes(int index, PlotCommit <L> commit, int nChildren)
{
// take care:
int remaining = nChildren;
BitSet blockedPositions = new BitSet();
for (int r = index - 1; r >= 0; r--)
{
PlotCommit rObj = this[r];
if (commit.IsChild(rObj))
{
if (--remaining == 0)
{
break;
}
}
if (rObj != null)
{
PlotLane lane = rObj.GetLane();
if (lane != null)
{
blockedPositions.Set(lane.GetPosition());
}
rObj.AddPassingLane(commit.lane);
}
}
// Now let's check whether we have to reposition the lane
if (blockedPositions.Get(commit.lane.GetPosition()))
{
int newPos = -1;
foreach (int pos in freePositions)
{
if (!blockedPositions.Get(pos))
{
newPos = pos;
break;
}
}
if (newPos == -1)
{
newPos = positionsAllocated++;
}
freePositions.AddItem(Sharpen.Extensions.ValueOf(commit.lane.GetPosition()));
activeLanes.Remove(commit.lane);
commit.lane.position = newPos;
activeLanes.AddItem(commit.lane);
}
}
protected internal override void Enter(int index, PlotCommit <L> currCommit)
{
SetupChildren(currCommit);
int nChildren = currCommit.GetChildCount();
if (nChildren == 0)
{
return;
}
if (nChildren == 1 && currCommit.children[0].ParentCount < 2)
{
// Only one child, child has only us as their parent.
// Stay in the same lane as the child.
//
PlotCommit c = currCommit.children[0];
if (c.lane == null)
{
// Hmmph. This child must be the first along this lane.
//
c.lane = NextFreeLane();
activeLanes.AddItem(c.lane);
}
for (int r = index - 1; r >= 0; r--)
{
PlotCommit rObj = this[r];
if (rObj == c)
{
break;
}
rObj.AddPassingLane(c.lane);
}
currCommit.lane = c.lane;
}
else
{
// More than one child, or our child is a merge.
// Use a different lane.
//
// Process all our children. Especially important when there is more
// than one child (e.g. a commit is processed where other branches
// fork out). For each child the following is done
// 1. If no lane was assigned to the child a new lane is created and
// assigned
// 2. The lane of the child is closed. If this frees a position,
// this position will be added freePositions list.
// If we have multiple children which where previously not on a lane
// each such child will get his own new lane but all those new lanes
// will be on the same position. We have to take care that not
// multiple newly created (in step 1) lanes occupy that position on
// which the
// parent's lane will be on. Therefore we delay closing the lane
// with the parents position until all children are processed.
// The lane on that position the current commit will be on
PlotLane reservedLane = null;
for (int i = 0; i < nChildren; i++)
{
PlotCommit c = currCommit.children[i];
// don't forget to position all of your children if they are
// not already positioned.
if (c.lane == null)
{
c.lane = NextFreeLane();
activeLanes.AddItem(c.lane);
if (reservedLane != null)
{
CloseLane(c.lane);
}
else
{
reservedLane = c.lane;
}
}
else
{
if (reservedLane == null && activeLanes.Contains(c.lane))
{
reservedLane = c.lane;
}
else
{
CloseLane(c.lane);
}
}
}
// finally all children are processed. We can close the lane on that
// position our current commit will be on.
if (reservedLane != null)
{
CloseLane(reservedLane);
}
currCommit.lane = NextFreeLane();
activeLanes.AddItem(currCommit.lane);
// take care: when connecting yourself to your child make sure that
// you will not be located on a lane on which a passed commit is
// located on. Otherwise we would have to draw a line through a
// commit.
int remaining = nChildren;
BitSet blockedPositions = new BitSet();
for (int r = index - 1; r >= 0; r--)
{
PlotCommit rObj = this[r];
if (currCommit.IsChild(rObj))
{
if (--remaining == 0)
{
break;
}
}
if (rObj != null)
{
PlotLane lane = rObj.GetLane();
if (lane != null)
{
blockedPositions.Set(lane.GetPosition());
}
rObj.AddPassingLane(currCommit.lane);
}
}
// Now let's check whether we have to reposition the lane
if (blockedPositions.Get(currCommit.lane.GetPosition()))
{
int newPos = -1;
foreach (int pos in freePositions)
{
if (!blockedPositions.Get(pos))
{
newPos = pos;
break;
}
}
if (newPos == -1)
{
newPos = positionsAllocated++;
}
freePositions.AddItem(currCommit.lane.GetPosition());
currCommit.lane.position = newPos;
}
}
}