LAB 4 Loan

void setup() {
  size(800, 550);
  background(0);
  draw_text(20, 40);
  draw_line(10, 5);
  calculat(150,80);
}

void calculat(int X,int Y){
  //set base value
  float beginBalance = 6000;
  float interestRPM =0.12/12; // IRPM is interestRatePerMonth because rate is 12 per year so per month is 12/12
  float interest =0;
  float payment =beginBalance*(interestRPM/(1-pow(1+interestRPM,-12)));
  float prinCipal = 0;
  float endingBalance =0;
  float sumInterest =0;
  int count = 1;

  while(count<=12){
    interest = interestRPM*beginBalance;
    prinCipal = payment - interest;
    endingBalance = beginBalance - prinCipal;
    sumInterest = sumInterest + interest;
 
    text(nf(+beginBalance,3,1),X,Y);
    text(nf(+interest,2,1),X+130,Y);
    text(nf(+prinCipal,3,1),X+220,Y);
    text(nf(+endingBalance,3,1),X+350,Y);
    text(nf(+sumInterest,3,1),X+530,Y);
    beginBalance = endingBalance;
    Y += 40;
    count ++ ;
  }
}
 




// function draw every text
void draw_text(int X, int Y) {
  int month=1;// set base value month
  textSize(16);
  fill(255, 0, 0);
  text("Month      BeginningBalance        Interest      Principal         EndingBalance                  InterestSum", X, Y);
  text_month(X+20,Y+40,month);
}

// function draw line
void draw_line(int X, int Y) {
  line_holizon(X, Y);
  line_vertical(X, Y);
}

// draw line vertical
void line_vertical(int X, int Y) {
  stroke(0, 0, 200);
  line(X+70, 0, X+70, 550);
  line(X+250, 0, X+250, 550);
  line(X+340, 0, X+340, 550);
  line(X+440, 0, X+440, 550);
  line(X+640, 0, X+640, 550);
}

// draw line holizon
void line_holizon(int X, int Y) {
  while (Y<550) {
    stroke(255);
    line(0, Y, 800, Y);
    Y+=40;
  }
}

// function draw number month
void text_month(int X,int Y,int month){
  fill(255);
  while(month<=12){
    text(month,X,Y);
    Y+=40;
    month++;
  }
}