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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, ValEdit, StdCtrls, Buttons, ExtCtrls, ClipBrd;

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    ValueListEditor1: TValueListEditor;
    GroupBox2: TGroupBox;
    Image1: TImage;
    GroupBox3: TGroupBox;
    BitBtn1: TBitBtn;
    procedure BitBtn1Click(Sender: TObject);
    procedure Image1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.BitBtn1Click(Sender: TObject);
var x,y:integer;
    x4,x3,x2,x1,x0:real;
    z,dvx,dvy:real;
    f:boolean;
begin
if Length(ValueListEditor1.Strings[0])>4 THEN
x4:=StrToFloat(Copy(ValueListEditor1.Strings[0],
5,Length(ValueListEditor1.Strings[0])-4)) else x4:=0;
Form1.Caption:=FloatToStr(x4)+'x^4';

if Length(ValueListEditor1.Strings[1])>4 THEN
x3:=StrToFloat(Copy(ValueListEditor1.Strings[1],
5,Length(ValueListEditor1.Strings[1])-4)) else x3:=0;
Form1.Caption:=Form1.Caption+'+'+FloatToStr(x3)+'x^3';

if Length(ValueListEditor1.Strings[2])>4 THEN
x2:=StrToFloat(Copy(ValueListEditor1.Strings[2],
5,Length(ValueListEditor1.Strings[2])-4)) else x2:=0;
Form1.Caption:=Form1.Caption+'+'+FloatToStr(x2)+'x^2';

if Length(ValueListEditor1.Strings[3])>4 THEN
x1:=StrToFloat(Copy(ValueListEditor1.Strings[3],
5,Length(ValueListEditor1.Strings[3])-4)) else x1:=0;
Form1.Caption:=Form1.Caption+'+'+FloatToStr(x1)+'x^1';

if Length(ValueListEditor1.Strings[4])>4 THEN
x0:=StrToFloat(Copy(ValueListEditor1.Strings[4],
5,Length(ValueListEditor1.Strings[4])-4)) else x0:=0;
Form1.Caption:=Form1.Caption+'+'+FloatToStr(x0)+'x^0';

if Length(ValueListEditor1.Strings[5])>4 THEN
dvx:=StrToFloat(Copy(ValueListEditor1.Strings[5],
5,Length(ValueListEditor1.Strings[5])-4)) else dvx:=1;

if Length(ValueListEditor1.Strings[6])>4 THEN
dvy:=StrToFloat(Copy(ValueListEditor1.Strings[6],
5,Length(ValueListEditor1.Strings[6])-4)) else dvy:=1;


f:=false;
{Image1.Canvas.Pen.Color:=$000000;
Image1.Canvas.CleanupInstance;}
Image1.Picture := NIL;
Image1.Canvas.Pen.Color:=$00FF00;
Image1.Canvas.MoveTo(150,0);
Image1.Canvas.LineTo(150,300);
Image1.Canvas.MoveTo(0,150);
Image1.Canvas.LineTo(300,150);
for x:=-150 to 150 do
  begin
  z:=x / dvx;
  y:=trunc((x4*z*z*z*z+x3*z*z*z+x2*z*z+x1*z+x0) / dvy); {or round?}
  if (y>=-150) and (y<=150) then
    begin
    Image1.Canvas.Pen.Color:=$FF0000;
    if f=false then Image1.Canvas.MoveTo(X+150,Y+150);f:=true;
{    Image1.Canvas.Pixels[X+150,Y+150]:=$FF0000;}
    Image1.Canvas.LineTo(X+150,Y+150);
    end;
  end;
end;

procedure TForm1.Image1Click(Sender: TObject);
var
 Bitmap: TBitmap;
begin
 Bitmap:=Image1.Picture.Bitmap;
 try
   Clipboard.Assign(Bitmap);
 finally
   Bitmap.Free;
 end;
end;

end.					

1:

Bitmap := TBitmap.Create;