Translation of I.1 from Nature of Code to openFrameworks

main.cpp

#include "ofMain.h"
#include "testApp.h"

int main( ){
  ofSetupOpenGL(1024,768,OF_WINDOW);
  ofRunApp(new testApp());
}

testApp.cpp

#include "testApp.h"
#include <ofGraphics.h>

void testApp::setup(){
  ofBackground(255);
  ofSetColor(0);
}

void testApp::update(){
  w.step();
}

void testApp::draw(){
  w.display();
}

testApp.h

#pragma once

#include "ofMain.h"
#include "Walker.h"

class testApp : public ofBaseApp{

 public:
  Walker w;
  void setup();
  void update();
  void draw();

};

Walker.h

#ifndef mySketch_Walker_h
#define mySketch_Walker_h

class Walker {
  int x;
  int y;
  
public:
  Walker() {
    x = ofGetWidth() / 2;
    y = ofGetHeight() / 2;
  }
  
  void step() {
    int choice = ofRandom(4);
    if (choice == 0) {
      x++;
    }
    else if (choice == 1) {
      x--;
    }
    else if (choice == 2) {
      y++;
    }
    else if (choice == 3) {
      y--;
    }
  }
  
  void display() {
    ofRect(x, y, 1, 1);
  }
};

#endif