/// <summary>
/// Initialize a tree node.
/// </summary>
private static SHPTreeNode NodeCreate(double[] padfBoundsMin,
double[] padfBoundsMax)
{
SHPTreeNode psTreeNode;
psTreeNode = new SHPTreeNode();
psTreeNode.nShapeCount = 0;
psTreeNode.panShapeIds = null;
psTreeNode.papsShapeObj = null;
psTreeNode.nSubNodes = 0;
if (padfBoundsMin != null)
{
c.memcpy(psTreeNode.adfBoundsMin, padfBoundsMin, sizeof(double) * 4);
}
if (padfBoundsMax != null)
{
c.memcpy(psTreeNode.adfBoundsMax, padfBoundsMax, sizeof(double) * 4);
}
return(psTreeNode);
}
/************************************************************************/
/* SHPTreeNodeTrim() */
/* */
/* This is the recurve version of SHPTreeTrimExtraNodes() that */
/* walks the tree cleaning it up. */
/************************************************************************/
private static bool NodeTrim(SHPTreeNode psTreeNode)
{
int i;
/* -------------------------------------------------------------------- */
/* Trim subtrees, and free subnodes that come back empty. */
/* -------------------------------------------------------------------- */
for (i = 0; i < psTreeNode.nSubNodes; i++)
{
if (NodeTrim(psTreeNode.apsSubNode[i]))
{
DestroyNode(ref psTreeNode.apsSubNode[i]);
psTreeNode.apsSubNode[i] =
psTreeNode.apsSubNode[psTreeNode.nSubNodes - 1];
psTreeNode.nSubNodes--;
i--; /* process the new occupant of this subnode entry */
}
}
/* -------------------------------------------------------------------- */
/* We should be trimmed if we have no subnodes, and no shapes. */
/* -------------------------------------------------------------------- */
return(psTreeNode.nSubNodes == 0 && psTreeNode.nShapeCount == 0);
}
/************************************************************************/
/* SHPDestroyTreeNode() */
/************************************************************************/
private static void DestroyNode(ref SHPTreeNode psTreeNode)
{
int i;
for (i = 0; i < psTreeNode.nSubNodes; i++)
{
if (psTreeNode.apsSubNode[i] != null)
{
DestroyNode(ref psTreeNode.apsSubNode[i]);
}
}
if (psTreeNode.panShapeIds != null)
{
c.free(ref psTreeNode.panShapeIds);
}
if (psTreeNode.papsShapeObj != null)
{
for (i = 0; i < psTreeNode.nShapeCount; i++)
{
if (psTreeNode.papsShapeObj[i] != null)
{
psTreeNode.papsShapeObj[i] = null;
}
}
c.free(ref psTreeNode.papsShapeObj);
}
c.free(ref psTreeNode);
}
/************************************************************************/
/* SHPTreeCollectShapesIds() */
/* */
/* Work function implementing SHPTreeFindLikelyShapes() on a */
/* tree node by tree node basis. */
/************************************************************************/
public void CollectShapeIds(SHPTreeNode psTreeNode,
double[] padfBoundsMin, double[] padfBoundsMax,
ref int pnShapeCount, ref int pnMaxShapes,
ref int[] ppanShapeList)
{
SHPTree hTree = this; /* do not free! */
int i;
/* -------------------------------------------------------------------- */
/* Does this node overlap the area of interest at all? If not, */
/* return without adding to the list at all. */
/* -------------------------------------------------------------------- */
if (!CheckBoundsOverlap(psTreeNode.adfBoundsMin,
psTreeNode.adfBoundsMax,
padfBoundsMin,
padfBoundsMax,
hTree.nDimension))
{
return;
}
/* -------------------------------------------------------------------- */
/* Grow the list to hold the shapes on this node. */
/* -------------------------------------------------------------------- */
if (pnShapeCount + psTreeNode.nShapeCount > pnMaxShapes)
{
pnMaxShapes = (pnShapeCount + psTreeNode.nShapeCount) * 2 + 20;
ppanShapeList =
SfRealloc(ref ppanShapeList, pnMaxShapes);
}
/* -------------------------------------------------------------------- */
/* Add the local nodes shapeids to the list. */
/* -------------------------------------------------------------------- */
for (i = 0; i < psTreeNode.nShapeCount; i++)
{
ppanShapeList[pnShapeCount++] = psTreeNode.panShapeIds[i];
}
/* -------------------------------------------------------------------- */
/* Recurse to subnodes if they exist. */
/* -------------------------------------------------------------------- */
for (i = 0; i < psTreeNode.nSubNodes; i++)
{
if (psTreeNode.apsSubNode[i] != null)
{
CollectShapeIds(psTreeNode.apsSubNode[i],
padfBoundsMin, padfBoundsMax,
ref pnShapeCount, ref pnMaxShapes,
ref ppanShapeList);
}
}
}
public static void free(ref SHPTreeNode memblock)
{
memblock = null;
}
/************************************************************************/
/* SHPTreeNodeAddShapeId() */
/************************************************************************/
private static bool NodeAddShapeId(
SHPTreeNode psTreeNode, SHPObject psObject,
int nMaxDepth, int nDimension)
{
int i;
/* -------------------------------------------------------------------- */
/* If there are subnodes, then consider wiether this object */
/* will fit in them. */
/* -------------------------------------------------------------------- */
if (nMaxDepth > 1 && psTreeNode.nSubNodes > 0)
{
for (i = 0; i < psTreeNode.nSubNodes; i++)
{
if (CheckObjectContained(psObject, nDimension,
psTreeNode.apsSubNode[i].adfBoundsMin,
psTreeNode.apsSubNode[i].adfBoundsMax))
{
return(NodeAddShapeId(psTreeNode.apsSubNode[i],
psObject, nMaxDepth - 1,
nDimension));
}
}
}
/* -------------------------------------------------------------------- */
/* Otherwise, consider creating four subnodes if could fit into */
/* them, and adding to the appropriate subnode. */
/* -------------------------------------------------------------------- */
#if MAX_SUBNODE_QUAD
else if (nMaxDepth > 1 && psTreeNode.nSubNodes == 0)
{
double[] adfBoundsMinH1 = new double[4], adfBoundsMaxH1 = new double[4];
double[] adfBoundsMinH2 = new double[4], adfBoundsMaxH2 = new double[4];
double[] adfBoundsMin1 = new double[4], adfBoundsMax1 = new double[4];
double[] adfBoundsMin2 = new double[4], adfBoundsMax2 = new double[4];
double[] adfBoundsMin3 = new double[4], adfBoundsMax3 = new double[4];
double[] adfBoundsMin4 = new double[4], adfBoundsMax4 = new double[4];
SplitBounds(psTreeNode.adfBoundsMin,
psTreeNode.adfBoundsMax,
adfBoundsMinH1, adfBoundsMaxH1,
adfBoundsMinH2, adfBoundsMaxH2);
SplitBounds(adfBoundsMinH1, adfBoundsMaxH1,
adfBoundsMin1, adfBoundsMax1,
adfBoundsMin2, adfBoundsMax2);
SplitBounds(adfBoundsMinH2, adfBoundsMaxH2,
adfBoundsMin3, adfBoundsMax3,
adfBoundsMin4, adfBoundsMax4);
if (CheckObjectContained(psObject, nDimension,
adfBoundsMin1, adfBoundsMax1) ||
CheckObjectContained(psObject, nDimension,
adfBoundsMin2, adfBoundsMax2) ||
CheckObjectContained(psObject, nDimension,
adfBoundsMin3, adfBoundsMax3) ||
CheckObjectContained(psObject, nDimension,
adfBoundsMin4, adfBoundsMax4))
{
psTreeNode.nSubNodes = 4;
psTreeNode.apsSubNode[0] = NodeCreate(adfBoundsMin1,
adfBoundsMax1);
psTreeNode.apsSubNode[1] = NodeCreate(adfBoundsMin2,
adfBoundsMax2);
psTreeNode.apsSubNode[2] = NodeCreate(adfBoundsMin3,
adfBoundsMax3);
psTreeNode.apsSubNode[3] = NodeCreate(adfBoundsMin4,
adfBoundsMax4);
/* recurse back on this node now that it has subnodes */
return(NodeAddShapeId(psTreeNode, psObject,
nMaxDepth, nDimension));
}
}
#else // MAX_SUBNODE_QUAD
/* -------------------------------------------------------------------- */
/* Otherwise, consider creating two subnodes if could fit into */
/* them, and adding to the appropriate subnode. */
/* -------------------------------------------------------------------- */
else if (nMaxDepth > 1 && psTreeNode.nSubNodes == 0)
{
double[] adfBoundsMin1 = new double[4], adfBoundsMax1 = new double[4];
double[] adfBoundsMin2 = new double[4], adfBoundsMax2 = new double[4];
SplitBounds(psTreeNode.adfBoundsMin, psTreeNode.adfBoundsMax,
adfBoundsMin1, adfBoundsMax1,
adfBoundsMin2, adfBoundsMax2);
if (CheckObjectContained(psObject, nDimension,
adfBoundsMin1, adfBoundsMax1))
{
psTreeNode.nSubNodes = 2;
psTreeNode.apsSubNode[0] = NodeCreate(adfBoundsMin1,
adfBoundsMax1);
psTreeNode.apsSubNode[1] = NodeCreate(adfBoundsMin2,
adfBoundsMax2);
return(NodeAddShapeId(psTreeNode.apsSubNode[0], psObject,
nMaxDepth - 1, nDimension));
}
else if (CheckObjectContained(psObject, nDimension,
adfBoundsMin2, adfBoundsMax2))
{
psTreeNode.nSubNodes = 2;
psTreeNode.apsSubNode[0] = NodeCreate(adfBoundsMin1,
adfBoundsMax1);
psTreeNode.apsSubNode[1] = NodeCreate(adfBoundsMin2,
adfBoundsMax2);
return(NodeAddShapeId(psTreeNode.apsSubNode[1], psObject,
nMaxDepth - 1, nDimension));
}
}
#endif // MAX_SUBNODE_QUAD
/* -------------------------------------------------------------------- */
/* If none of that worked, just add it to this nodes list. */
/* -------------------------------------------------------------------- */
psTreeNode.nShapeCount++;
psTreeNode.panShapeIds =
SfRealloc(ref psTreeNode.panShapeIds,
psTreeNode.nShapeCount);
psTreeNode.panShapeIds[psTreeNode.nShapeCount - 1] = psObject.nShapeId;
if (psTreeNode.papsShapeObj != null)
{
psTreeNode.papsShapeObj =
SfRealloc(ref psTreeNode.papsShapeObj,
psTreeNode.nShapeCount);
psTreeNode.papsShapeObj[psTreeNode.nShapeCount - 1] = null;
}
return(true);
}
