/**
* 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);
}
}
}
}