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#ifndef STIM_NETWORK_H
#define STIM_NETWORK_H
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#include <stdlib.h>
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#include <assert.h>
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#include <sstream>
#include <fstream>
#include <algorithm>
#include <string.h>
#include <math.h>
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#include <stim/math/vector.h>
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#include <stim/visualization/obj.h>
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#include <stim/visualization/cylinder.h>
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#include <ANN/ANN.h>
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#include <boost/tuple/tuple.hpp>
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namespace stim{
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/** This is the a class that interfaces with gl_spider in order to store the currently
* segmented network. The following data is stored and can be extracted:
* 1)Network geometry and centerline.
* 2)Network connectivity (a graph of nodes and edges), reconstructed using ANN library.
*/
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template<typename T>
class network{
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///Each edge is a fiber with two nodes.
///Each node is an in index to the endpoint of the fiber in the nodes array.
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class edge : public cylinder<T>
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{
public:
unsigned v[2]; //unique id's designating the starting and ending
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// default constructor
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edge() : cylinder<T>(){v[1] = -1; v[0] = -1;}
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/// Constructor - creates an edge from a list of points by calling the stim::fiber constructor
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///@param p is an array of positions in space
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edge(std::vector< stim::vec<T> > p) : cylinder<T>(p){}
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/// Copy constructor creates an edge from a fiber
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edge(stim::cylinder<T> f) : cylinder<T>(f) {}
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/// Resamples an edge by calling the fiber resampling function
edge resample(T spacing){
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edge e(cylinder<T>::resample(spacing)); //call the fiber->edge constructor
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e.v[0] = v[0]; //copy the vertex data
e.v[1] = v[1];
return e; //return the new edge
}
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/// Output the edge information as a string
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std::string str(){
std::stringstream ss;
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ss<<"("<<cylinder<T>::size()<<")\tl = "<<length()<<"\t"<<v[0]<<"----"<<v[1];
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return ss.str();
}
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};
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///Node class that stores the physical position of the node as well as the edges it is connected to (edges that connect to it), As well as any additional data necessary.
class vertex : public stim::vec<T>
{
public:
//std::vector<unsigned int> edges; //indices of edges connected to this node.
std::vector<unsigned int> e[2]; //indices of edges going out (e[0]) and coming in (e[1])
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//stim::vec<T> p; //position of this node in physical space.
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//constructor takes a stim::vec
vertex(stim::vec<T> p) : stim::vec<T>(p){}
/// Output the vertex information as a string
std::string str(){
std::stringstream ss;
ss<<"\t(x, y, z) = "<<stim::vec<T>::str();
if(e[0].size() > 0){
ss<<"\t> ";
for(unsigned int o = 0; o < e[0].size(); o++)
ss<<e[0][o]<<" ";
}
if(e[1].size() > 0){
ss<<"\t< ";
for(unsigned int i = 0; i < e[1].size(); i++)
ss<<e[1][i]<<" ";
}
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return ss.str();
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}
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};
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protected:
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std::vector<edge> E; //list of edges
std::vector<vertex> V; //list of vertices.
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public:
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///Returns the number of edges in the network.
unsigned int edges(){
return E.size();
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}
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///Returns the number of nodes in the network.
unsigned int vertices(){
return V.size();
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}
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std::vector<vertex> operator*(T s){
for (unsigned i=0; i< vertices; i ++ ){
V[i] = V[i] * s;
}
return V;
}
std::vector<vertex> operator*(vec<T> s){
for (unsigned i=0; i< vertices; i ++ ){
for (unsigned dim = 0 ; dim< 3; dim ++){
V[i][dim] = V[i][dim] * s[dim];
}
}
return V;
}
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// Returns an average of branching index in the network
double BranchingIndex(){
double B=0;
for(unsigned v=0; v < V.size(); v ++){
B += ((V[v].e[0].size()) + (V[v].e[1].size()));
}
B = B / V.size();
return B;
}
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// Returns an average of fiber/edge lengths in the network
double Lengths(){
stim::vec<T> L;double sumLength = 0;
for(unsigned e = 0; e < E.size(); e++){ //for each edge in the network
L.push_back(E[e].length()); //append the edge length
sumLength = sumLength + E[e].length();
}
double avg = sumLength / E.size();
return avg;
}
// Returns an average of tortuosities in the network
double Tortuosities(){
stim::vec<T> t;
stim::vec<T> id1, id2; // starting and ending vertices of the edge
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double distance;double tortuosity;double sumTortuosity = 0;
for(unsigned e = 0; e < E.size(); e++){ //for each edge in the network
id1 = E[e][0]; //get the edge starting point
id2 = E[e][E[e].size() - 1]; //get the edge ending point
distance = (id1 - id2).len(); //displacement between the starting and ending points
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if(distance > 0){
tortuosity = E[e].length()/ distance ; // tortuoisty = edge length / edge displacement
}
else{
tortuosity = 0;}
t.push_back(tortuosity);
sumTortuosity += tortuosity;
}
double avg = sumTortuosity / E.size();
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return avg;
}
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stim::cylinder<T> get_cylinder(unsigned f){
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return E[f]; //return the specified edge (casting it to a fiber)
}
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//load a network from an OBJ file
void load_obj(std::string filename){
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stim::obj<T> O; //create an OBJ object
O.load(filename); //load the OBJ file as an object
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std::vector<unsigned> id2vert; //this list stores the OBJ vertex ID associated with each network vertex
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unsigned i[2]; //temporary, IDs associated with the first and last points in an OBJ line
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//for each line in the OBJ object
for(unsigned int l = 1; l <= O.numL(); l++){
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std::vector< stim::vec<T> > c; //allocate an array of points for the vessel centerline
O.getLine(l, c); //get the fiber centerline
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edge new_edge = c; //create an edge from the given centerline
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unsigned int I = new_edge.size(); //calculate the number of points on the centerline
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//get the first and last vertex IDs for the line
std::vector< unsigned > id; //create an array to store the centerline point IDs
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O.getLinei(l, id); //get the list of point IDs for the line
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i[0] = id.front(); //get the OBJ ID for the first element of the line
i[1] = id.back(); //get the OBJ ID for the last element of the line
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std::vector<unsigned>::iterator it; //create an iterator for searching the id2vert array
unsigned it_idx; //create an integer for the id2vert entry index
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//find out if the nodes for this fiber have already been created
it = find(id2vert.begin(), id2vert.end(), i[0]); //look for the first node
it_idx = std::distance(id2vert.begin(), it);
if(it == id2vert.end()){ //if i[0] hasn't already been used
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vertex new_vertex = new_edge[0]; //create a new vertex, assign it a position
new_vertex.e[0].push_back(E.size()); //add the current edge as outgoing
new_edge.v[0] = V.size(); //add the new vertex to the edge
V.push_back(new_vertex); //add the new vertex to the vertex list
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id2vert.push_back(i[0]); //add the ID to the ID->vertex conversion list
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}
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else{ //if the vertex already exists
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V[it_idx].e[0].push_back(E.size()); //add the current edge as outgoing
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new_edge.v[0] = it_idx;
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}
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it = find(id2vert.begin(), id2vert.end(), i[1]); //look for the second ID
it_idx = std::distance(id2vert.begin(), it);
if(it == id2vert.end()){ //if i[1] hasn't already been used
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vertex new_vertex = new_edge[I-1]; //create a new vertex, assign it a position
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new_vertex.e[1].push_back(E.size()); //add the current edge as incoming
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new_edge.v[1] = V.size(); //add the new vertex to the edge
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V.push_back(new_vertex); //add the new vertex to the vertex list
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id2vert.push_back(i[1]); //add the ID to the ID->vertex conversion list
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}
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else{ //if the vertex already exists
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V[it_idx].e[1].push_back(E.size()); //add the current edge as incoming
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new_edge.v[1] = it_idx;
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}
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E.push_back(new_edge); //push the edge to the list
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}
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}
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/// Output the network as a string
std::string str(){
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std::stringstream ss;
ss<<"Nodes ("<<V.size()<<")--------"<<std::endl;
for(unsigned int v = 0; v < V.size(); v++){
ss<<"\t"<<v<<V[v].str()<<std::endl;
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}
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ss<<"Edges ("<<E.size()<<")--------"<<std::endl;
for(unsigned e = 0; e < E.size(); e++){
ss<<"\t"<<e<<E[e].str()<<std::endl;
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}
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return ss.str();
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}
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/// This function resamples all fibers in a network given a desired minimum spacing
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/// @param spacing is the minimum distance between two points on the network
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stim::network<T> resample(T spacing){
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stim::network<T> n; //create a new network that will be an exact copy, with resampled fibers
n.V = V; //copy all vertices
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n.E.resize(edges()); //allocate space for the edge list
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//copy all fibers, resampling them in the process
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for(unsigned e = 0; e < edges(); e++){ //for each edge in the edge list
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n.E[e] = E[e].resample(spacing); //resample the edge and copy it to the new network
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}
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return n; //return the resampled network
}
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/// Calculate the total number of points on all edges.
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unsigned total_points(){
unsigned n = 0;
for(unsigned e = 0; e < E.size(); e++)
n += E[e].size();
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return n;
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}
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// gaussian function
float gaussianFunction(float x, float std=25){ return exp(-x/(2*std*std));} // by default std = 25
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// stim 3d vector to annpoint of 3 dimensions
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void stim2ann(ANNpoint &a, stim::vec<T> b){
a[0] = b[0];
a[1] = b[1];
a[2] = b[2];
}
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/// Calculate the average magnitude across the entire network.
/// @param m is the magnitude value to use. The default is 0 (usually radius).
T average(unsigned m = 0){
T M, L; //allocate space for the total magnitude and length
M = L = 0; //initialize both the initial magnitude and length to zero
for(unsigned e = 0; e < E.size(); e++){ //for each edge in the network
M += E[e].integrate(m); //get the integrated magnitude
L += E[e].length(); //get the edge length
}
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return M / L; //return the average magnitude
}
/// This function compares two networks and returns the percentage of the current network that is missing from A.
/// @param A is the network to compare to - the field is generated for A
/// @param sigma is the user-defined tolerance value - smaller values provide a stricter comparison
stim::network<T> compare(stim::network<T> A, float sigma){
stim::network<T> R; //generate a network storing the result of the comparison
R = (*this); //initialize the result with the current network
//generate a KD-tree for network A
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float metric = 0.0; // initialize metric to be returned after comparing the networks
ANNkd_tree* kdt; // initialize a pointer to a kd tree
double **c; // centerline (array of double pointers) - points on kdtree must be double
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unsigned int n_data = A.total_points(); // set the number of points
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c = (double**) malloc(sizeof(double*) * n_data); // allocate the array pointer
for(unsigned int i = 0; i < n_data; i++) // allocate space for each point of 3 dimensions
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c[i] = (double*) malloc(sizeof(double) * 3);
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unsigned t = 0;
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for(unsigned e = 0; e < A.E.size(); e++){ //for each edge in the network
for(unsigned p = 0; p < A.E[e].size(); p++){ //for each point in the edge
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for(unsigned d = 0; d < 3; d++){ //for each coordinate
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c[t][d] = A.E[e][p][d];
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}
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t++;
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}
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}
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//compare each point in the current network to the field produced by A
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ANNpointArray pts = (ANNpointArray)c; // create an array of data points of type double
kdt = new ANNkd_tree(pts, n_data, 3); // build a KD tree using the annpointarray
double eps = 0; // error bound
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ANNdistArray dists = new ANNdist[1]; // near neighbor distances
ANNidxArray nnIdx = new ANNidx[1]; // near neighbor indices // allocate near neigh indices
stim::vec<T> p0, p1;
float m0, m1;
float M = 0; //stores the total metric value
float l; //stores the segment length
float L = 0; //stores the total network length
ANNpoint queryPt = annAllocPt(3);
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for(unsigned e = 0; e < R.E.size(); e++){ //for each edge in A
R.E[e].add_mag(0); //add a new magnitude for the metric
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for(unsigned p = 0; p < R.E[e].size(); p++){ //for each point in the edge
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p1 = R.E[e][p]; //get the next point in the edge
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stim2ann(queryPt, p1);
kdt->annkSearch( queryPt, 1, nnIdx, dists, eps); //find the distance between A and the current network
m1 = 1.0f - gaussianFunction(dists[0], sigma); //calculate the metric value based on the distance
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R.E[e].set_mag(m1, p, 1); //set the error for the second point in the segment
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}
}
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return R; //return the resulting network
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/// Returns the number of magnitude values stored in each edge. This should be uniform across the network.
unsigned nmags(){
return E[0].nmags();
}
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// split a string in text by the character sep
stim::vec<T> split(std::string &text, char sep)
{
stim::vec<T> tokens;
std::size_t start = 0, end = 0;
while ((end = text.find(sep, start)) != std::string::npos) {
tokens.push_back(atof(text.substr(start, end - start).c_str()));
start = end + 1;
}
tokens.push_back(atof(text.substr(start).c_str()));
return tokens;
}
// load a network in text file to a network class
void load_txt(std::string filename)
{
std::vector <std::string> file_contents;
std::ifstream file(filename);
std::string line;
std::vector<unsigned> id2vert; //this list stores the vertex ID associated with each network vertex
//for each line in the text file, store them as strings in file_contents
while (std::getline(file, line))
{
std::stringstream ss(line);
file_contents.push_back(ss.str());
}
unsigned int numEdges = atoi(file_contents[0].c_str()); //number of edges in the network
unsigned int I = atoi(file_contents[1].c_str()) ; //calculate the number of points3d on the first edge
unsigned int count = 1; unsigned int k = 2; // count is global counter through the file contents, k is for the vertices on the edges
// for each edge in the network.
for (unsigned int i = 0; i < numEdges; i ++ )
{
// pre allocate a position vector p with number of points3d on the edge p
std::vector< stim::vec<T> > p(0, I);
// for each point on the nth edge
for (unsigned int j = k; j < I + k; j++)
{
// split the points3d of floats with separator space and form a float3 position vector out of them
p.push_back(split(file_contents[j], ' '));
}
count += p.size() + 1; // increment count to point at the next edge in the network
I = atoi(file_contents[count].c_str()); // read in the points3d at the next edge and convert it to an integer
k = count + 1;
edge new_edge = p; // create an edge with a vector of points3d on the edge
E.push_back(new_edge); // push the edge into the network
}
unsigned int numVertices = atoi(file_contents[count].c_str()); // this line in the text file gives the number of distinct vertices
count = count + 1; // this line of text file gives the first verrtex
// push each vertex into V
for (unsigned int i = 0; i < numVertices; i ++)
{
vertex new_vertex = split(file_contents[count], ' ');
V.push_back(new_vertex);
count += atoi(file_contents[count + 1].c_str()) + 2; // Skip number of edge ids + 2 to point to the next vertex
}
} // end load_txt function
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// strTxt returns a string of edges
std::string
strTxt(std::vector< stim::vec<T> > p)
{
std::stringstream ss;
std::stringstream oss;
for(unsigned int i = 0; i < p.size(); i++){
ss.str(std::string());
for(unsigned int d = 0; d < 3; d++){
ss<<c[i][d];
}
ss < "\n"
}
return ss.str();
}
// removes specified character from string
void removeCharsFromString(std::string &str, char* charsToRemove ) {
for ( unsigned int i = 0; i < strlen(charsToRemove); ++i ) {
str.erase( remove(str.begin(), str.end(), charsToRemove[i]), str.end() );
}
}
//exports network to txt file
void
to_txt(std::string filename)
{
std::ofstream ofs;
ofs.open(filename, std::ofstream::out | std::ofstream::app);
int num;
ofs << (E.size()).str() << "\n";
for(unsigned int i = 0; i < E.size(); i++)
{
std::string str;
ofs << (E[i].size()).str() << "\n";
str = E[i].strTxt();
ofs << str << "\n";
}
for(int i = 0; i < V.size(); i++)
{
std::string str;
str = V[i].str();
removeCharsFromString(str, "[],");
ofs << str << "\n";
}
ofs.close();
}
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}; //end stim::network class
}; //end stim namespace
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#endif
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