Как построить график в с++ builder

#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
#include "math.h"
#include <iostream.h>
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
 
        float f(float x)
        {
          return 2*sin(x)*exp(x/5);
        }
 
void Grafik()
{
 float x1, x2;
 float y1,y2;
 
 float x,y;
 float dx;
 int l, b;
 int w, h;
 float mx, my;
 int x0, y0;
 
 l = 10;
 b = Form1->ClientHeight-20;
 h = Form1->ClientHeight-40;
 w = Form1->Width-20;
 
 x1 = 0;
 x2 = 25;
 dx = 0.01;
 //----------------------
 
 x = x1;
 y1 = f(x);
 y2 = f(x);
  do
  {
   y = f(x);
   if(y < y1) y1 = y;
   if(y > y2) y2 = y;
   x+= dx;
  }while(x <= x2);
 
  my = h/fabs(y2-y1);
  mx = w/fabs(x2 - x1);
 
  x0 = l+fabs(x1*mx);
  y0 = b-fabs(y1*my);
  Form1->Canvas->MoveTo(x0,b);
  Form1->Canvas->LineTo(x0,b-h);
  Form1->Canvas->MoveTo(l,y0);
  Form1->Canvas->LineTo(l+w,y0);
  Form1->Canvas->TextOutA(x0+5,b-h,FloatToStrF(y2,ffGeneral,6,3));
  Form1->Canvas->TextOutA(x0+5,b,FloatToStrF(y1,ffGeneral,6,3));
 
  //Ïîñòðîåíèå ãðàôèêà
  x=x1;
   do
   {
    y=f(x);
    Form1->Canvas->Pixels[x0+x*mx][y0-y*my] = clRed;
    x +=dx;
    }
    while(x<=x2);
}