diff --git a/main.cpp b/main.cpp
index 819b99c..a0d1ded 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,29 +1,82 @@
-// make sure sfml is installed:
-// linux - sudo apt-get install libsfml-dev
-// windows - manual dl from https://www.sfml-dev.org/download.php
-#include <SFML/Graphics.hpp>
+#include <iostream> // cin, cout
+#include <fstream> // ifstream
+#include <cstdlib> // srand, rand
+#include <ctime> // time
+#include <cstring> // strcmp
+#include <vector> // TODO: or use arrays for maximum performance?
 
+#include "Display.h"
+#include "Point.h" // TODO: check if there is a usable SFML or c++ class
 #include "Timing.h"
 
-int main()
+int main (int argc, char **argv)
 {
-    sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
-    sf::CircleShape shape(100.f);
-    shape.setFillColor(sf::Color::Green);
-
-    while (window.isOpen())
+    // read program arguments
+    // -v               mode with enabled visualization
+    // -f <filename>    read random numbers from file
+    // TODO: care a little more <3
+    std::string fileRnd = "";
+    bool vis = false;
+    for (int i = 0; i < argc; ++i)
     {
-        sf::Event event;
-        while (window.pollEvent(event))
-        {
-            if (event.type == sf::Event::Closed)
-                window.close();
-        }
-
-        window.clear();
-        window.draw(shape);
-        window.display();
+        if (strcmp(argv[i], "-v") == 0) vis = true;
+        else if (strcmp(argv[i], "-f") == 0) fileRnd = argv[i + 1];
     }
 
+    int valCount = 10;
+    std::vector<Point> points;
+    if (fileRnd.empty()) // generate random numbers
+    {
+        std::cout << "generating random numbers..." << std::endl;
+        //srand(static_cast <unsigned> (time(0)));
+        srand(static_cast <unsigned> (0)); // fixed seed for testing
+        for (int i = 0; i < valCount; ++i)
+        {
+            float x = static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / WIDTH));
+            float y = static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / HEIGHT));
+            points.push_back(Point(x, y));
+        }
+    }
+    else // read random numbers
+    {
+        std::cout << "reading random numbers from file: " << fileRnd << "..." << std::endl;
+        std::ifstream in(fileRnd.c_str());
+        if (in.is_open())
+        {
+            std::string line;
+            std::getline(in, line); // get first line for explizit valueCount
+            valCount = std::stoi(line);
+            for (int i = 0; i < valCount; ++i)
+            {
+                getline(in, line);
+                //getline(in, line, ','); // could also be used slightly different but includes newlines :/
+                size_t pos = line.find(',');
+                if (pos != std::string::npos)
+                {
+                    float x = std::stof(line.substr(0, pos));
+                    float y = std::stof(line.substr(pos + 1));
+                    points.push_back(Point(x, y));
+                }
+                else
+                {
+                    throw "invalid format!";
+                }
+            }
+        }
+    }
+
+    for (Point& pt : points)
+    {
+        std::cout << "pt: " << pt.x() << ", " << pt.y() << std::endl;
+    }
+
+    if (vis)
+    {
+        Display display;
+        display.show();
+    }
+
+    std::cout << "any key to exit...";
+    std::cin.get();
     return 0;
 }
\ No newline at end of file