Графика и симметричное отображение

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
#include<fstream.h>
#include "U_lab5.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
class Koord {
public :
int x;
int y;
};
const int K=100;
int i=0;
Koord mast[K];
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::FormCreate(TObject *Sender)
{
Image1->Canvas->Brush->Color = clWhite;
Image1->Canvas->FillRect(Rect(0,0,Image1->Width, Image1->Height));
}
 
//---------------------------------------------------------------------------
void __fastcall TForm1::Image1MouseDown(TObject *Sender,
      TMouseButton Button, TShiftState Shift, int X, int Y)
{
if (Shift.Contains(ssLeft)) {
mast[i].x = X;
mast[i].y = Y;
Image1->Canvas->Brush->Color = clWhite;
Image1->Canvas->TextOutA(X, Y+5, i);
Image1->Canvas->Brush->Color = clRed;
Image1->Canvas->Ellipse(X-3, Y-3, X+3, Y+3);
i++;
}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
if(i>0) {
int j=0;
for(j=0; j<i-1; j++){
Image1->Canvas->Pen->Color=clGreen;
Image1->Canvas->MoveTo(mast[j].x, mast[j].y);
Image1->Canvas->LineTo(mast[j+1].x, mast[j+1].y);
}
Image1->Canvas->MoveTo(mast[j].x, mast[j].y);
Image1->Canvas->LineTo(mast[0].x, mast[0].y);
}
if(i<=1) ShowMessage("Не хватает точек!");
}
//---------------------------------------------------------------------------
 
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Image1Click(TObject *Sender)
{
Image1->Canvas->MoveTo(286,10);
Image1->Canvas->LineTo(286,567);  
Image1->Canvas->MoveTo(10,286);
Image1->Canvas->LineTo(567,286);
}
//---------------------------------------------------------------------------