graph.cpp

#include "graph.h"

Graph::Graph(const int &numberOfNodes) {
	for (int i = 0; i < numberOfNodes; i++) {
		std::vector<bool> row;
		for (int j = 0; j < numberOfNodes; j++) {
			row.emplace_back(false);
		}
		connections.emplace_back(row);
	}
}
void Graph::connectNodes(const int &node1, const int &node2) {
	if (node2 < node1) {
		const int temp = node1;
		const int node1 = node2;
		const int node2 = temp;
	}
	if ((node1 < 1) || (node2 > connections.size())) {
		throw "Node number is bigger than number of nodes or smaller than 1.";
	}
	connections[node1 - 1][node2 - 1] = true;
	connections[node2 - 1][node1 - 1] = true;
}
void Graph::disconnectNodes(const int &node1, const int &node2) {
	if (node2 < node1) {
		const int temp = node1;
		const int node1 = node2;
		const int node2 = temp;
	}
	if ((node1 < 1) || (node2 > connections.size())) {
		throw "Node number is bigger than number of nodes or smaller than 1.";
	}
	connections[node1 - 1][node2 - 1] = false;
	connections[node2 - 1][node1 - 1] = false;
}
void Graph::printAdjacencyMatrix() {
	for (int i = 0; i < connections.size(); i++) {
		for (int j = 0; j < connections.size(); j++) {
			std::cout << connections[i][j] << " ";
		}
		std::cout << std::endl;
	}
	std::cout << std::endl;
}
bool Graph::isPath(const int &node1, const int &node2) {
	if ((node1 < 1) || (node2 > connections.size()) || (node2 < 1) || (node1 > connections.size())) {
		throw "Node number is bigger than number of nodes or smaller than 1.";
	}

	std::vector<int> visited;
	std::vector<int> path;
	return searchPath(node2, node1, &visited);
}
bool Graph::searchPath(const int &node1, const int &node2, std::vector<int> *visitedNodes) {
	if (std::find(visitedNodes->begin(), visitedNodes->end(), node1) == visitedNodes->end()) {
		visitedNodes->emplace_back(node1);
		if (connections[node1 - 1][node2 - 1]) {
			Helper::writeNodeToFile(node2, "exercise3");
			Helper::writeNodeToFile(node1, "exercise3");
			return true;
		}
		for (int i = 0; i < connections[node1 - 1].size(); i++) {
			if (connections[node1 - 1][i]) {
				if (searchPath(i + 1, node2, visitedNodes)) {
					Helper::writeNodeToFile(node1, "exercise3");
					return true;
				} else {
					return false;
				}
			}
		}
		return false;

	}
	return false;
}
bool Graph::isConnected(){
	//Implement for Task2
	return false;
}