void SquareMaze::bottomRemove(int x, int y, DisjointSets & maze,int & count,int rindex)
{
if (maze.find(rindex) != maze.find(rindex+maze_width))
{
setWall(x, y, 1, false);
maze.setunion(rindex, rindex+maze_width);
count++;
}
}
void SquareMaze::rightRemove(int x, int y, DisjointSets & maze,int & count,int rindex)
{
if (maze.find(rindex) != (maze.find(rindex+1)))
{
setWall(x, y, 0, false);
maze.setunion(rindex, rindex+1);
count++;
}
}
/**
* Finds a minimal spanning tree on a graph.
* THIS FUNCTION IS GRADED.
*
* @param graph - the graph to find the MST of
*
* @todo Label the edges of a minimal spanning tree as "MST"
* in the graph. They will appear blue when graph.savePNG() is called.
*
* @note Use your disjoint sets class from MP 7.1 to help you with
* Kruskal's algorithm. Copy the files into the libdsets folder.
* @note You may call std::sort (http://www.cplusplus.com/reference/algorithm/sort/)
* instead of creating a priority queue.
*/
void GraphTools::findMST(Graph & graph)
{
vector<Edge> eds = graph.getEdges();
sort(eds.begin(), eds.end(),myfunction);
DisjointSets vers;
vector <Vertex> vertex_list = graph.getVertices();
vers.addelements(vertex_list.size());
for (int i = 0; i < eds.size(); i++)
{
Vertex u = eds[i].source;
Vertex v = eds[i].dest;
if (vers.find(u) != vers.find(v))
{
vers.setunion(u,v);
graph.setEdgeLabel(u,v,"MST");
}
}
}
/**
* Finds a minimal spanning tree on a graph.
* THIS FUNCTION IS GRADED.
*
* @param graph - the graph to find the MST of
*
* @todo Label the edges of a minimal spanning tree as "MST"
* in the graph. They will appear blue when graph.savePNG() is called.
*
* @note Use your disjoint sets class from MP 7.1 to help you with
* Kruskal's algorithm. Copy the files into the libdsets folder.
* @note You may call std::sort (http://www.cplusplus.com/reference/algorithm/sort/)
* instead of creating a priority queue.
*/
void GraphTools::findMST(Graph & graph)
{
vector<Edge> theEdges = graph.getEdges();
std::sort(theEdges.begin(), theEdges.end());
DisjointSets theVertexSet;
vector<Vertex> theVertices = graph.getVertices();
theVertexSet.addelements(theVertices.size());
int size = theVertices.size();
int count = 0;
vector<Edge>::iterator iter;
for(iter = theEdges.begin(); iter != theEdges.end(); iter++)
{
if(count == size - 1) break;
if(theVertexSet.find(iter->source) != theVertexSet.find(iter->dest))
{
theVertexSet.setunion(iter->source, iter->dest);
graph.setEdgeLabel(iter->source, iter->dest, "MST");
count++;
}
}
}
void SquareMaze::makeMaze(int width, int height)
{
right.clear();
bottom.clear();
maze_width = width;
maze_height = height;
blocks = maze_width * maze_height;
right.resize(blocks,true);
bottom.resize(blocks,true);
DisjointSets maze;
maze.addelements(blocks);
srand(time(NULL));
//int x, y;
bool rightmost=true, bottommost=true;
int count = 0;
//int rindex;
while (count< (blocks - 1))
{
int rindex = rand() % blocks;
int x = rindex%maze_width;
int y = rindex/maze_width;
if(x==(maze_width-1))
rightmost=true;
else rightmost=false;
if(y==(maze_height-1))
bottommost=true;
else bottommost=false;
if (( rightmost == true ) && ( bottommost == true ))
{
rightmost=rightmost;
}
else if (!rightmost && !bottommost)
{
int action=rand()%3;
if (action == 0)
rightRemove(x,y, maze,count,rindex);
else if (action == 1)
bottomRemove(x,y, maze,count,rindex);
else {
if ((maze.find(rindex) != maze.find(rindex+1)) && (maze.find(rindex) != maze.find(rindex+maze_width))&& (maze.find(rindex+1) != maze.find(rindex+1)))
{
setWall(x, y, 0, false);
setWall(x, y, 1, false);
maze.setunion(rindex, rindex+1);
maze.setunion(rindex, rindex+maze_width);
count+=2;
}
}
}
else if(bottommost)
{
int action=rand()%2;
if (action== 1)rightRemove(x,y, maze,count,rindex);
}
else
{
int action =rand()%2;
if (action == 1)bottomRemove(x,y, maze,count,rindex);
}
}
}
void SquareMaze::makeMaze(int width,int height)
{
width1=width;
height1=height;
int size=width*height;
right.clear();
down.clear();//clearing right and down walls just in case
right=vector<bool>(size, true);//set all walls so they are there we will remove later
down=vector<bool>(size, true);
vector<int> blocks(size);//vector for indicies
// map<int, int> maps;
for(int i=0;i<size; i++)
{
blocks.push_back(i);//pushing back the indidces for the maze
// for(int j=0; j<height1; j++)
// {
// // maps.insert(make_pair(i,j));
// }
}
DisjointSets set;
set.addelements(size);//used to stop cycles from being created
srand(time(0));
// std::random_shuffle(maps.begin(), maps.end());
std::random_shuffle(blocks.begin(), blocks.end());//randomly shuffles indicies so it doesnt create the same maze
// map<int, int>::iterator it;
vector<int> :: iterator it;
for(it=blocks.begin(); it!=blocks.end(); it++)
{
int x=*it%width;//x and y coords for the index
int y=*it/width;
int index=*it; //actual index
if(x!=width1-1 ) //cant go any farther to the right in this case so dont want to do it
{
int index1=index+1;
if(set.find(index)!=set.find(index1)) //checking if the one to the right of the index is in the same set
{
setWall(x,y,0,false);//if they are not in the same set we can remove the wall
set.setunion(index, index1); //we connect them so they are in the same set
//works because if we try to remove something in the same set it will create a cycle
}
}
if(y!=height1-1)
{
int index2=index+width1;
if(set.find(index)!= set.find(index2))
{
setWall(x,y,1,false); //do the same for if we want to go down
set.setunion(index, index2);
}
}
}
}
//compute bag affiliation for all vertices
//store result in m_bagindex
void ClusterAnalysis::computeBags() {
const Graph &G = m_C->constGraph();
// Storage structure for results
m_bagindex.init(G);
// We use Union-Find for chunks and bags
DisjointSets<> uf;
NodeArray<int> setid(G); // Index mapping for union-find
#if 0
node* nn = new node[G.numberOfNodes()]; // dito
#endif
// Every cluster gets its index
ClusterArray<int> cind(*m_C);
// We store the lists of cluster vertices
List<node>* clists = new List<node>[m_C->numberOfClusters()];
int i = 0;
// Store index and detect the current leaf clusters
List<cluster> ccleafs;
ClusterArray<int> unprocessedChildren(*m_C); //processing below: compute bags
for(cluster c : m_C->clusters)
{
cind[c] = i++;
if (c->cCount() == 0) ccleafs.pushBack(c);
unprocessedChildren[c] = c->cCount();
}
// Now we run through all vertices, storing them in the parent lists,
// at the same time, we initialize m_bagindex
for(node v : G.nodes)
{
// setid is constant in the following
setid[v] = uf.makeSet();
// Each vertex v gets its own ClusterArray that stores v's bag index per cluster.
// See comment on use of ClusterArrays above
m_bagindex[v] = new ClusterArray<int>(*m_C,DefaultIndex, m_C->maxClusterIndex()+1);//m_C->numberOfClusters());
cluster c = m_C->clusterOf(v);
// Push vertices in parent list
clists[cind[c]].pushBack(v);
}
// Now each clist contains the direct vertex descendants
// We process the clusters bottom-up, compute the chunks
// of the leafs first. At each level, for a cluster the
// vertex lists of all children are concatenated
// (could improve this by having an array of size(#leafs)
// and concatenating only at child1), then the bags are
// updated as follows: chunks may be linked by exactly
// the edges with lca(c) ie the ones in m_lcaEdges[c],
// and bags may be built by direct child clusters that join chunks.
// While concatenating the vertex lists, we can check
// for the vertices in each child if the uf number is the same
// as the one of a first initial vertex, otherwise we join.
// First, lowest level clusters are processed: All chunks are bags
OGDF_ASSERT(!ccleafs.empty());
while (!ccleafs.empty()){
const cluster c = ccleafs.popFrontRet();
Skiplist<int*> cbags; //Stores bag indexes ocurring in c
auto storeResult = [&] {
for (node v : clists[cind[c]]) {
int theid = uf.find(setid[v]);
(*m_bagindex[v])[c] = theid;
if (!cbags.isElement(&theid)) {
cbags.add(new int(theid));
}
// push into list of outer active vertices
if (m_storeoalists && isOuterActive(v, c)) {
(*m_oalists)[c].pushBack(v);
}
}
(*m_bags)[c] = cbags.size(); // store number of bags of c
};
if (m_storeoalists){
//no outeractive vertices detected so far
(*m_oalists)[c].clear();
}
//process leafs separately
if (c->cCount() == 0) {
//Todo could use lcaEdges list here too, see below
for (node u : c->nodes)
{
for(adjEntry adj : u->adjEntries) {
node w = adj->twinNode();
if (m_C->clusterOf(w) == c)
{
uf.link(uf.find(setid[u]),uf.find(setid[w]));
}
}
}
// Now all chunks in the leaf cluster are computed
// update for parent is done in the else case
storeResult();
}
else {
// ?We construct the vertex list by concatenating
// ?the lists of the children to the current list.
// We need the lists for storing the results efficiently.
// (Should be slightly faster than to call clusterNodes each time)
// Bags are either links of chunks by edges with lca==c
// or links of chunk by child clusters.
// Edge links
for(edge e : (*m_lcaEdges)[c]) {
uf.link(uf.find(setid[e->source()]),uf.find(setid[e->target()]));
}
// Cluster links
for(cluster cc : c->children)
{
//Initial id per child cluster cc: Use value of first
//vertex, each time we encounter a different value in cc,
//we link the chunks
//add (*itcc)'s vertices to c's list
ListConstIterator<node> itvc = clists[cind[cc]].begin();
int inid;
if (itvc.valid()) inid = uf.find(setid[*itvc]);
while (itvc.valid())
{
int theid = uf.find(setid[*itvc]);
if (theid != inid)
uf.link(inid,theid);
clists[cind[c]].pushBack(*itvc);
++itvc;
}
}
storeResult();
}
// Now we update the status of the parent cluster and,
// in case all its children are processed, add it to
// the process queue.
if (c != m_C->rootCluster())
{
OGDF_ASSERT(unprocessedChildren[c->parent()] > 0);
unprocessedChildren[c->parent()]--;
if (unprocessedChildren[c->parent()] == 0) ccleafs.pushBack(c->parent());
}
}
// clean up
delete[] clists;
}