From 3b4a6f74b678b6e0e45085f50fff117ae795146e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Fuhry?= <rene.fuhry@gmail.com>
Date: Fri, 26 May 2023 12:39:54 +0200
Subject: [PATCH] can now create random graphs

---
 src/Graph.java      |  2 +-
 src/Matrix.java     | 24 ++++++++++++++++++++++++
 src/TestGraph.java  | 19 ++++++++++++++-----
 src/TestMatrix.java | 14 ++++++++++----
 4 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/src/Graph.java b/src/Graph.java
index fef94a6..e71ff6d 100644
--- a/src/Graph.java
+++ b/src/Graph.java
@@ -86,6 +86,7 @@ public class Graph {
 
     public void calculateExzentrizitäten() {
         exzentrizitäten = new ArrayList<>(1);
+        connected = true;
 
         for(int rowIndex = 0; rowIndex < distanzMatrix.getRowLength(); rowIndex++) {
             int exzentrizität = 0;
@@ -110,7 +111,6 @@ public class Graph {
         
         radius = Integer.MAX_VALUE;
         diameter = -1;
-        connected = true;
         centre = new ArrayList<>(1);
 
         for(int rowIndex = 0; rowIndex < exzentrizitäten.size(); rowIndex++) {
diff --git a/src/Matrix.java b/src/Matrix.java
index c79aed9..d891d09 100644
--- a/src/Matrix.java
+++ b/src/Matrix.java
@@ -3,6 +3,8 @@ import java.io.IOException;
 import java.util.Random;
 import java.io.FileReader;
 import java.io.FileNotFoundException;
+import java.io.BufferedWriter;
+import java.io.FileWriter;
 
 public class Matrix {
     private int[][] matrix;
@@ -13,6 +15,9 @@ public class Matrix {
 
     public Matrix(int rowLength, int columnLength, boolean random) {
         if(!random) {
+            matrix = new int[rowLength][columnLength];
+            this.rowLength = rowLength;
+            this.columnLength = columnLength;
             return;
         }
         matrix = new int[rowLength][columnLength];
@@ -114,6 +119,25 @@ public class Matrix {
         }
     }
 
+    public void WriteToCsv(String filename) {
+        String s = "";
+
+        try (BufferedWriter bw = new BufferedWriter(new FileWriter(filename))) {
+            for(int columnIndex=0; columnIndex < columnLength; columnIndex++) {
+                s = "";
+                for(int rowIndex=0; rowIndex < rowLength; rowIndex++) {
+                    s += matrix[columnIndex][rowIndex];
+                    if(rowIndex < rowLength - 1) {
+                        s += ";";
+                    }
+                }
+                bw.write(s + "\n");
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
     public String toString() {
         String s = "";
         for(int columnIndex=0; columnIndex < columnLength; columnIndex++) {
diff --git a/src/TestGraph.java b/src/TestGraph.java
index d05dbf0..8d295b4 100644
--- a/src/TestGraph.java
+++ b/src/TestGraph.java
@@ -1,12 +1,13 @@
 public class TestGraph {
     public static void main(String[] args) {
-        test1();
-        test2();
-        test3();
-        test4();
+        // test1();
+        // test2();
+        // test3();
+        // test4();
+        test5();
     }
 
-    static String pathToProgramRoot = "";
+    static String pathToProgramRoot = "/home/rene/projects/Java/graphprogram";
 
 
     /*
@@ -41,4 +42,12 @@ public class TestGraph {
         Graph g = new Graph(pathToProgramRoot + "/csv/art-brck.csv");
         System.out.println(g);
     }
+
+    /*
+     * randomly generated graph with x nodes
+     */
+    public static void test5() {
+        Graph g = new Graph(pathToProgramRoot + "/csv/50n.csv");
+        System.out.println(g);
+    }
 }
\ No newline at end of file
diff --git a/src/TestMatrix.java b/src/TestMatrix.java
index 210da69..c714b6d 100644
--- a/src/TestMatrix.java
+++ b/src/TestMatrix.java
@@ -1,11 +1,12 @@
 public class TestMatrix {
     public static void main(String[] args) {
-        test1();
-        test2();
+        // test1();
+        // test2();
+        createCsv();
     }
 
     public static void test1() {
-        String pathToProgramRoot = "";
+        String pathToProgramRoot = "/home/rene/projects/grpahprogram";
 
         Matrix matrix = new Matrix(pathToProgramRoot + "/csv/graph.csv");
         Matrix scalarProduct;
@@ -22,5 +23,10 @@ public class TestMatrix {
     public static void test2() {
         Matrix bruh = new Matrix(10, 10, true);
         System.out.println(bruh);
-    } 
+    }
+
+    public static void createCsv() {
+        Matrix bruh = new Matrix(50, 50, true);
+        bruh.WriteToCsv("csv/50n.csv");
+    }
 }