[color=800000][/color]
.cpp
#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include "dstring.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
  ox=-1;
  oy=-1;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
  sort=0;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  sort=1;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormMouseDown(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{
  ox=X;
  oy=Y;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormMouseUp(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{
  if(ox>0&&oy>0)
  {
    Canvas->LineTo(X,Y);
  }
  ox=X;
  oy=Y;
  Canvas->MoveTo(ox,oy);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormKeyUp(TObject *Sender, WORD &Key,
      TShiftState Shift)
{
  int X,Y;
  if(Key==VK_BACK)
  {

  }
}
//---------------------------------------------------------------------------
.h
int sort,ox,ox;