made findComponents work
It took way too long, now onto fixing bridges and articulations
This commit is contained in:
René Fuhry
GitHub
327
Graph.java
Normal file
327
Graph.java
Normal file
@@ -0,0 +1,327 @@
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import java.util.ArrayList;
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import java.util.Arrays;
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public class Graph {
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private Matrix adjazenzMatrix;
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private Matrix distanzMatrix;
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private Matrix wegMatrix;
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private boolean zusammenhaengend;
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private int[] exzentrizitäten;
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private int radius;
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private int durchmesser;
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private ArrayList<Integer> centre;
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private int[][] components;
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private int[][] bridges;
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private int[] articulations;
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public static void main(String[] args) {}
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public Graph(String file) {
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adjazenzMatrix = new Matrix(file);
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calculateDistanzMatrix();
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calculateWegMatrix();
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calculateExzentrizitäten();
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calculateProperties();
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findComponents();
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//findBridges();
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//findArticulations();
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}
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public void calculateDistanzMatrix() {
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distanzMatrix = new Matrix(adjazenzMatrix.getRowLength(), adjazenzMatrix.getColumnLength());
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Matrix potenzMatrix = adjazenzMatrix;
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for(int columnIndex=0; columnIndex < distanzMatrix.getColumnLength(); columnIndex++) {
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for(int rowIndex=0; rowIndex < distanzMatrix.getRowLength(); rowIndex++) {
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if(adjazenzMatrix.getValueAt(rowIndex, columnIndex) == 1) {
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distanzMatrix.insert(rowIndex, columnIndex, 1);
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} else if(columnIndex == rowIndex) {
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distanzMatrix.insert(rowIndex, columnIndex, 0);
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} else {
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distanzMatrix.insert(rowIndex, columnIndex, -1);
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}
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}
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}
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for(int k = 2; k < distanzMatrix.getRowLength(); k++) {
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potenzMatrix = potenzMatrix.multiply(adjazenzMatrix);
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for(int columnIndex=0; columnIndex < distanzMatrix.getColumnLength(); columnIndex++) {
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for(int rowIndex=0; rowIndex < distanzMatrix.getRowLength(); rowIndex++) {
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if(potenzMatrix.getValueAt(rowIndex, columnIndex) != 0 && distanzMatrix.getValueAt(rowIndex, columnIndex) == -1) {
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distanzMatrix.insert(rowIndex, columnIndex, k);
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}
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}
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}
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}
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}
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public void calculateWegMatrix() {
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wegMatrix = new Matrix(adjazenzMatrix.getRowLength(), adjazenzMatrix.getColumnLength());
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Matrix potenzMatrix = adjazenzMatrix;
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for(int columnIndex=0; columnIndex < wegMatrix.getColumnLength(); columnIndex++) {
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for(int rowIndex=0; rowIndex < wegMatrix.getRowLength(); rowIndex++) {
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if(columnIndex == rowIndex) {
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wegMatrix.insert(rowIndex, columnIndex, 1);
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} else if(adjazenzMatrix.getValueAt(rowIndex, columnIndex) > 0 && wegMatrix.getValueAt(rowIndex, columnIndex) == 0) {
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wegMatrix.insert(rowIndex, columnIndex, 1);
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}
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}
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}
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for(int k = 2; k < wegMatrix.getRowLength(); k++) {
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potenzMatrix = potenzMatrix.multiply(adjazenzMatrix);
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for(int columnIndex=0; columnIndex < wegMatrix.getColumnLength(); columnIndex++) {
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for(int rowIndex=0; rowIndex < wegMatrix.getRowLength(); rowIndex++) {
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if(potenzMatrix.getValueAt(rowIndex, columnIndex) != 0) {
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wegMatrix.insert(rowIndex, columnIndex, 1);
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}
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}
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}
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}
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}
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public void calculateExzentrizitäten() {
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exzentrizitäten = new int[distanzMatrix.getRowLength()];
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for(int rowIndex = 0; rowIndex < distanzMatrix.getRowLength(); rowIndex++) {
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int exzentrizität = 0;
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for(int columnIndex = 0; columnIndex < distanzMatrix.getColumnLength(); columnIndex++) {
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if(distanzMatrix.getValueAt(columnIndex, rowIndex) > exzentrizität && rowIndex != columnIndex) {
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exzentrizität = distanzMatrix.getValueAt(columnIndex, rowIndex);
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}
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}
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exzentrizitäten[rowIndex] = exzentrizität;
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}
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}
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public void calculateProperties() {
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radius = Integer.MAX_VALUE;
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durchmesser = -1;
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zusammenhaengend = true;
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centre = new ArrayList<>(1);
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for(int rowIndex = 0; rowIndex < exzentrizitäten.length; rowIndex++) {
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if(exzentrizitäten[rowIndex] > durchmesser) {
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durchmesser = exzentrizitäten[rowIndex];
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centre.clear();
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centre.add(rowIndex + 1);
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}
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if(exzentrizitäten[rowIndex] < radius) {
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radius = exzentrizitäten[rowIndex];
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}
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if(exzentrizitäten[rowIndex] == durchmesser) {
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centre.add(rowIndex + 1);
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}
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}
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if(durchmesser == 0 && exzentrizitäten.length > 1) {
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zusammenhaengend = false;
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return;
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}
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centre.trimToSize();
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}
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public void findComponents() {
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ArrayList<int[]> tempComponents = new ArrayList<>(1);
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ArrayList<Integer> tempComponent = new ArrayList<>(1);
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int[] component;
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boolean contains;
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for(int rowIndex = 0; rowIndex < wegMatrix.getRowLength(); rowIndex++) {
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for(int columnIndex = 0; columnIndex < wegMatrix.getColumnLength(); columnIndex++) {
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if(wegMatrix.getValueAt(rowIndex, columnIndex) == 1) {
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tempComponent.add(columnIndex + 1);
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}
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}
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component = new int[tempComponent.size()];
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for(int index = 0; index < component.length; index++) {
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component[index] = tempComponent.get(index);
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}
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contains = false;
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for(int index = 0; index < tempComponents.size(); index++) {
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if(Arrays.equals(tempComponents.get(index), component)) {
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contains = true;
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}
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}
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if(!contains) {
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tempComponents.add(component);
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}
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component = null;
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tempComponent.clear();
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}
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components = new int[tempComponents.size()][wegMatrix.getColumnLength()];
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for(int rowIndex = 0; rowIndex < components.length; rowIndex++) {
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components[rowIndex] = tempComponents.get(rowIndex);
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}
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}
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public int[][] findComponents(Matrix matrix) {
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int[][] newComponents;
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ArrayList<int[]> tempComponents = new ArrayList<>(1);
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ArrayList<Integer> tempComponent = new ArrayList<>(1);
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int[] component;
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for(int rowIndex = 0; rowIndex < matrix.getRowLength(); rowIndex++) {
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for(int columnIndex = 0; columnIndex < matrix.getColumnLength(); columnIndex++) {
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if(matrix.getValueAt(rowIndex, columnIndex) == 1) {
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tempComponent.add(columnIndex + 1);
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}
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}
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component = new int[tempComponent.size()];
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for(int index = 0; index < component.length; index++) {
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component[index] = tempComponent.get(index);
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}
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if(tempComponents.contains(component)) {
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continue;
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}
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tempComponents.add(component);
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component = null;
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tempComponent.clear();
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}
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newComponents = new int[tempComponents.size()][matrix.getColumnLength()];
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for(int rowIndex = 0; rowIndex < newComponents.length; rowIndex++) {
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newComponents[rowIndex] = tempComponents.get(rowIndex);
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}
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return newComponents;
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}
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public void findBridges() {
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if(!zusammenhaengend) {
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return;
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}
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ArrayList<int[]> tempBridges = new ArrayList<>(10);
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int[][] newComponents;
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int[] bridge;
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for(int columnIndex = 0; columnIndex < wegMatrix.getColumnLength(); columnIndex++) {
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for(int rowIndex = 0; rowIndex < wegMatrix.getRowLength(); rowIndex++) {
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wegMatrix.insert(rowIndex, columnIndex, 0);
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wegMatrix.insert(columnIndex, rowIndex, 0);
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bridge = new int[2];
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bridge[0] = columnIndex + 1;
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bridge[1] = rowIndex + 1;
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newComponents = findComponents(wegMatrix);
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System.out.println(Arrays.toString(bridge));
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if(!components.equals(newComponents) && !tempBridges.contains(bridge)) {
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System.out.println("bruh");
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tempBridges.add(bridge);
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}
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bridge = null;
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wegMatrix.insert(rowIndex, columnIndex, 1);
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wegMatrix.insert(columnIndex, rowIndex, 1);
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}
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}
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bridges = new int[tempBridges.size()][2];
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for(int rowIndex = 0; rowIndex < bridges.length; rowIndex++) {
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bridges[rowIndex] = tempBridges.get(rowIndex);
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}
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}
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public void findArticulations() {
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if(!zusammenhaengend) {
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return;
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}
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ArrayList<Integer> tempArticulations = new ArrayList<>(10);
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int[][] newComponents;
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for(int i = 0; i < wegMatrix.getRowLength(); i++) {
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for(int rowIndex = 0; rowIndex < wegMatrix.getRowLength(); rowIndex++) {
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for(int columnIndex = 0; columnIndex < wegMatrix.getColumnLength(); columnIndex++) {
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wegMatrix.insert(rowIndex, i, 0);
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wegMatrix.insert(i, columnIndex, 0);
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}
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}
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/*
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* need to figure out what removing a node means
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*/
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newComponents = findComponents(wegMatrix);
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if(!components.equals(newComponents)) {
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tempArticulations.add(i + 1);
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}
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for(int rowIndex = 0; rowIndex < wegMatrix.getRowLength(); rowIndex++) {
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for(int columnIndex = 0; columnIndex < wegMatrix.getColumnLength(); columnIndex++) {
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wegMatrix.insert(rowIndex, i, 1);
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wegMatrix.insert(i, columnIndex, 1);
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}
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}
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}
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articulations = new int[tempArticulations.size()];
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for(int rowIndex = 0; rowIndex < articulations.length; rowIndex++) {
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articulations[rowIndex] = tempArticulations.get(rowIndex);
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}
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}
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public String toString() {
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String s = "";
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s += "Adjazenzmatrix:\n" + adjazenzMatrix + "\nDistanzmatrix:\n" + distanzMatrix + "\nWegmatrix:\n" + wegMatrix;
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if(!zusammenhaengend) {
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s += "\nExzentrizitäten/Radius/Durchmesser: Kein zusammenhängender Graph";
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} else {
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s += "\nExzentrizitäten: " + Arrays.toString(exzentrizitäten) + "\nRadius: " + radius + "\nDurchmesser: " + durchmesser;
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}
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s += "\nZentrum: ";
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if(zusammenhaengend) {
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s += centre;
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} else {
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s += "Kein zusammenhängender Graph";
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}
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s += "\nKomponente: {";
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for(int rowIndex = 0; rowIndex < components.length; rowIndex++) {
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if(components[rowIndex] != null) {
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s += Arrays.toString(components[rowIndex]);
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if(rowIndex < components.length - 1) {
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if(components[rowIndex + 1] != null) {
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s += ",";
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}
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}
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}
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}
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s += "}";
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s += "\nBrücken: {";
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if(bridges != null) {
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for(int rowIndex = 0; rowIndex < bridges.length; rowIndex++) {
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if(bridges[rowIndex] != null) {
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s += Arrays.toString(bridges[rowIndex]);
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if(rowIndex < bridges.length - 1) {
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if(bridges[rowIndex + 1] != null) {
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s += ",";
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}
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}
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}
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}
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}
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s += "}";
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s += "\nArtikulationen: " + Arrays.toString(articulations);
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return s;
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}
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}
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