Расчет формулы и построение графика в Builder c++

#include <vcl.h>
#pragma hdrstop
#include <math.h>
#include "lab9.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
void lab(float x,float t)
{
  float e=exp(1.0);
  float X;
  float y=2.23;
  float z=15.221;
  float f=39.374;
  float K;
  float k=0.45;
  int xo,yo;
  float T;
  int r=3;
  float a=pow(x,6)+pow(log(y),2);
  K=pow(a,1/r);
  randomize();
  xo = Form1->PaintBox1->Width;
  xo=0;
  yo = Form1->PaintBox1->Height;
  yo/= 2;
  for(X = x ; X>2.23; X += 5)
  {
  for (T = f;T <= 900.0;  T +=0.001)
     {
       f=((pow(e,x-y))*pow((x-y),(x-y)))/(atan(x)-atan(z))+ K;
       Form1->PaintBox1->Canvas->Pixels[f*k+xo][yo+k]=clBlack;
     }
        Sleep(50);
        Form1->PaintBox1->Canvas->Brush->Color=clWhite;
        Form1->PaintBox1->Canvas->FillRect(Rect(0,0,Form1->PaintBox1->Width,Form1->PaintBox1->Height));
 
   }
   }
//---------------------------------------------------------------------------
 
 
void __fastcall TForm1::DrawClick(TObject *Sender)
{
int X;
X=StrToInt(Edit1->Text);
lab(X,0.0);
}
//---------------------------------------------------------------------------