.cpp

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.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::Button6Click(TObject *Sender)
{
  if(ColorDialog1->Execute())
  {
    TColor pencolor;
    Canvas->Pen->Color=ColorDialog1->Color;
  }          
}
//---------------------------------------------------------------------------

void __fastcall TForm1::RadioButton1Click(TObject *Sender)
{
  Canvas->Pen->Style=psSolid;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton2Click(TObject *Sender)
{
  Canvas->Pen->Style=psDash;        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton3Click(TObject *Sender)
{
  Canvas->Pen->Style=psDot;        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton4Click(TObject *Sender)
{
  Canvas->Pen->Style=psDashDot;        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Edit1Change(TObject *Sender)
{
  Canvas->Pen->Width=StrToInt(Edit1->Text);        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button7Click(TObject *Sender)
{
  if(ColorDialog1->Execute())
  {
    TColor pencolor;
    Canvas->Brush->Color=ColorDialog1->Color;
  }          
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton5Click(TObject *Sender)
{
  Canvas->Brush->Style=bsSolid;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton6Click(TObject *Sender)
{
  Canvas->Brush->Style=bsClear;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton7Click(TObject *Sender)
{
  Canvas->Brush->Style=bsHorizontal;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton8Click(TObject *Sender)
{
  Canvas->Brush->Style=bsVertical;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  sort=0;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
  sort=1;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button3Click(TObject *Sender)
{
  sort=2;        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button4Click(TObject *Sender)
{
  sort=3;        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button5Click(TObject *Sender)
{
  Canvas->Refresh();
}
//---------------------------------------------------------------------------
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)
{
  if (Key==VK_BACK)
  {

  }
}
//---------------------------------------------------------------------------

.h
int sort,ox,oy;