/**
* Sum the perimeter of all white leaves in the two specified
* quadrants of the sub quad tree rooted at this node. Since
* this is a grey node, we just recursively call this routine
* on the appropriate children (that may be white nodes).
*
* @param quad1 the first specified quadrant
* @param quad2 the second specified quadrant
* @param size the size of the image represented by this node
* @return the perimeter of the adjacent nodes
*/
public override int sumAdjacent(Quadrant quad1, Quadrant quad2, int size)
{
QuadTreeNode child1 = quad1.child(this);
QuadTreeNode child2 = quad2.child(this);
size = size / 2;
return(child1.sumAdjacent(quad1, quad2, size) + child2.sumAdjacent(quad1, quad2, size));
}
/**
* Compute the perimeter for a black node.
*
* @param size
*/
public override int perimeter(int size)
{
int retval = 0;
// North
QuadTreeNode neighbor = gtEqualAdjNeighbor(QuadTreeNode.NORTH);
if (neighbor == null || neighbor is WhiteNode)
{
retval += size;
}
else if (neighbor is GreyNode)
{
retval += neighbor.sumAdjacent(Quadrant.cSouthEast, Quadrant.cSouthWest, size);
}
else
{
;
}
// East
neighbor = gtEqualAdjNeighbor(QuadTreeNode.EAST);
if (neighbor == null || neighbor is WhiteNode)
{
retval += size;
}
else if (neighbor is GreyNode)
{
retval += neighbor.sumAdjacent(Quadrant.cSouthWest, Quadrant.cNorthWest, size);
}
else
{
;
}
// South
neighbor = gtEqualAdjNeighbor(QuadTreeNode.SOUTH);
if (neighbor == null || neighbor is WhiteNode)
{
retval += size;
}
else if (neighbor is GreyNode)
{
retval += neighbor.sumAdjacent(Quadrant.cNorthWest, Quadrant.cNorthEast, size);
}
else
{
;
}
// West
neighbor = gtEqualAdjNeighbor(QuadTreeNode.WEST);
if (neighbor == null || neighbor is WhiteNode)
{
retval += size;
}
else if (neighbor is GreyNode)
{
retval += neighbor.sumAdjacent(Quadrant.cNorthEast, Quadrant.cSouthEast, size);
}
else
{
;
}
return(retval);
}