Tree TreeBuild(TREE_TYPE inorder[], TREE_TYPE auxorder[], enum TreeOrders auxtype, int len) {
// Caso o comprimento seja 0, não temos o que analisar
if(len < 1) return NULL;
int r;
TREE_TYPE rootval;
Tree left, right;
// Na pre-ordem, o valor da raiz é sempre o primeiro da lista
// Na pós-ordem, esse valor é sempre o último
if(Tree_preOrder == auxtype) {
rootval = auxorder[0];
// Pulando o valor da raiz, será mais fácil obter as sub arvores
auxorder += 1;
} else if(Tree_postOrder == auxtype) {
rootval = auxorder[len - 1];
} else {
// O tipo de ordem auxiliar é inválido, então retornar
return NULL;
}
// Encontra em que posição da lista em-ordem está a raiz
for(r = 0; r < len; ++r) {
if(rootval == inorder[r]) break;
}
// A raiz fica entre a sub-arvore esquerda e a direita na lista em ordem
// Na lista auxiliar, os elementos da sub arvore tambem ficam agrupados
left = TreeBuild(inorder, auxorder, auxtype, r);
right = TreeBuild((inorder + r + 1), (auxorder + r), auxtype, (len - r - 1));
return TreeNodeBuild(rootval, left, right);
}
int main(void) {
char inorder[32] = "ZVCDJNGHI";
char postorder[32] = "ZCJDVHIGN";
char preorder[32] = {0};
int written;
Tree tree = TreeBuild(inorder, postorder, Tree_postOrder, strlen(inorder));
printf("Arvore Resultante\n");
TreePrint(tree);
printf("\n");
printf("ABB: %d\n", TreeIsBST(tree));
printf("\n");
written = TreeTraversal(tree, Tree_preOrder, preorder, 32);
printf("Pre-ordem: %s\n", preorder);
insertionSort(preorder, written);
printf("Ordenado com insertionSort: %s\n", preorder);
printf("\n");
return 0;
}
neBool neTriangleTree::BuildTree(neV3 * _vertices, s32 _vertexCount, neTriangle * tris, s32 triCount, neAllocatorAbstract * _alloc)
{
if (!_vertices || _vertexCount <= 0)
return false;
if (!tris || triCount <= 0)
return false;
if (_alloc)
alloc = _alloc;
else
alloc = &allocDef;
if (triangles.GetTotalSize() > 0)
{
FreeTree();
}
triangles.Reserve(triCount, alloc);
vertices = (neV3*)alloc->Alloc(sizeof(neV3) * _vertexCount);
vertexCount = _vertexCount;
s32 i;
for (i = 0; i < vertexCount; i++)
{
vertices[i] = _vertices[i];
}
for (i = 0; i < triCount; i++)
{
neTriangle * t = triangles.Alloc();
ASSERT(t);
*t = tris[i];
}
nodes.Reserve(sim->sizeInfo.terrainNodesStartCount, alloc, sim->sizeInfo.terrainNodesGrowByCount);
neSimpleArray<s32> triIndex;
triIndex.Reserve(triCount, alloc);
for (i = 0; i < triCount; i++)
{
s32 * j = triIndex.Alloc();
*j = i;
}
neV3 minBound, maxBound;
FindMinMaxBound(this, triIndex, minBound, maxBound);
root.Initialise(this, -2, minBound, maxBound);
//root.Build(triIndex, 0);
TreeBuild(this, -1, triIndex, 0);
s32 nodeUsed = nodes.GetUsedCount();
triIndex.Free();
return true;
}
void TreeBuild(neTriangleTree * tree, s32 nodeIndex, neSimpleArray<s32> & triIndex, s32 level)
{
// if (nodeIndex == 769)
// ASSERT(0);
neV3 maxBound, minBound;
neV3 com;
FindCenterOfMass(tree, triIndex, &com);
s32 i;
if (level > 4)
{
tree->GetNode(nodeIndex).MakeLeaf(triIndex);
return;
}
if (triIndex.GetUsedCount() < 10)
{
tree->GetNode(nodeIndex).MakeLeaf(triIndex);
return;
}
for (i = 0; i < 4; i++)
{
neSimpleArray<s32> sectorTris;
tree->GetNode(nodeIndex).CountTriangleInSector(triIndex, sectorTris, com, i);
if (sectorTris.GetUsedCount())
{
if (sectorTris.GetUsedCount() == triIndex.GetUsedCount())
{
tree->GetNode(nodeIndex).MakeLeaf(triIndex);
return;
}
else
{
FindMinMaxBound(tree, sectorTris, minBound, maxBound);
f32 yMin = minBound[1];
f32 yMax = maxBound[1];
neTreeNode * node = tree->nodes.Alloc();
ASSERT(node);
tree->GetNode(nodeIndex).SelectBound(com, minBound, maxBound, i);
minBound[1] = yMin;
maxBound[1] = yMax;
node->Initialise(tree, nodeIndex, minBound, maxBound);
tree->GetNode(nodeIndex).children[i] = tree->nodes.GetIndex(node);
TreeBuild(tree, tree->GetNode(nodeIndex).children[i], sectorTris, level + 1);
}
}
else
{
tree->GetNode(nodeIndex).children[i] = -1;
}
}
}