Graphing Data w/ C++ using FLTK

while (!inFile.eof()){
    vector.clear();
    getline (inFile,line);
    if ( line.substr(0,time_check.length()) == time_check ){
        getline (inFile,line);}

//find lines that begin with 41    
        if ( line.substr(0,line_check.length()) == line_check ) {// if the line starts with "41"
        substr = line.substr(line_check.length());//str.substr(line_check.length()) is the series of stuff after the "41"
//splits into digits/numbers 

    for (i=2; i <= substr.length()+1; i+= 2){
        subsubstr = line.substr(i,2);//str.substr(i,1)are individual stuff in this case ONLY
        //stores separated stuff into vector [unknown type]
       vector.push_back( subsubstr );
    }

//START OF DATA TYPE 11
    if (vector.at(0) == num){
        cout << "ok it's throttle position"<< "\n";

        //determining A (3rd 4th digits after 41)
        string dummy = vector.at(1);
        truck.convertA(dummy);
        printf("%.2f \n", truck.position());

    } //END OF DATA TYPE 11

//START OF DATA TYPE 10
    if (vector.at(0) == num2){
        cout << "ok it's MAF"<< "\n";

        //determining A (3rd 4th digits after 41)
        string dummy2 = vector.at(1);
        truck.convertB(dummy2);

        //determning B (5th 6th digits after 41) if there are any
        string dummy3 = vector.at(2);
        truck.convertC(dummy3);
        printf("%.2f \n", truck.flowrate());



//END OF DATA TYPE 10



//////////////////////////////////////////   END CODE FROM PREVIOUS    //////////////////////////////////////////////////////////


////////////////////////////////////////// CODE OF GRAPH /////////////////////////////////////////////////////////////////////////


//open gui window
        
        Window win(Point(100, 100), 600, 400, "Graph of Data");
        win.show();
        

//axis for graph 1 - > throttle position 

        //const int time1= 1;
        //const int time2= 10;


        /*
        class Scale{
            int cbase;
            int vbase;
            double scale;
        public:
            Scale(int b, int vb, double s): cbase(b), vbase(vb), scale(s){}
            int operator()(int v) const{return cbase + (v-vbase)*scale;}
        };
        */


   Axis xAxis1(Axis::x, Point(100,350),280, 10, "time");
   xAxis1.label.set_color(Color::black);
   win.attach(xAxis1);
 //win.wait_for_button();
 
   
   Axis yAxis1(Axis::y, Point(100,350),280, 10, "throttle position");
   yAxis1.set_color(Color::black);
   yAxis1.label.set_color(Color::black);
   win.attach(yAxis1);
 //  win.wait_for_button();


 Open_polyline position;

 Text position_label(Point(20,position.point(0).y),"THROTTLE");
 position.set_color(Color::red);
 position_label.set_color(Color::red); 

 
  win.attach(position);
  gui_main();