Graphics::TBitmap* bmp=new Graphics::TBitmap;
    .......//在此處將甜甜圈的影像資料,放到bmp裡;
    .......//記得設定 bmp->Transparent = true; 這樣才有空心的效果;
    // { 如果要並列顯示,請加上這一段,不然就只要Canvas->Draw(x, y, 
    //   bmp),x,y是要秀出的位置;
    int w(b->Width);
    int h(b->Height);        for (int y(0); y < Height; y  = h) 
    {
       for (int x(0); x < Width; x  = w) 
       {
            Canvas->Draw(x, y, bmp);
       }
    }
    // }
    delete bmp;

引言: 因為不會用 CreateEllipticRgn、CombineRgn等API函式製作一個甜甜圈區域 (HRGN),我只能提供上述的方法。方便的話,教一下怎麼做HRGN()

//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
HRGN MyRgn; //甜甜圈區域範圍
HRGN hRgn1 = ::CreateEllipticRgn(0, 0, 200, 200);
HRGN hRgn2 = ::CreateEllipticRgn(20, 20, 180, 180);
//再結合此兩個橢圓形位置與範圍，即為甜甜圈區域
::CombineRgn(MyRgn,hRgn1,hRgn2,RGN_XOR);    //這裡就是要處理的地方...    //完成繪出戒指後，逐一釋放區域物件
::DeleteObject(hRgn1);
::DeleteObject(hRgn2);
::DeleteObject(MyRgn);
}
//---------------------------------------------------------------------------

Graphics::TBitmap *Bmp = new Graphics::TBitmap();  // 請載入原始圖;    void __fastcall TForm1::ButtonClick(TObject *Sender)
{
 Graphics::TBitmap* bmp1=new Graphics::TBitmap;
 byte *ptr1,*ptr2;
 RECT  R;
 HRGN MyRgn = ::CreateEllipticRgn(0, 0, Bmp->Width, Bmp->Height); //甜甜圈區域範圍;
 HRGN hRgn1 = ::CreateEllipticRgn(0, 0, 200, 200);
 HRGN hRgn2 = ::CreateEllipticRgn(20, 20, 180, 180);     //再結合此兩個橢圓形位置與範圍，即為甜甜圈區域;
 ::CombineRgn(MyRgn,hRgn1,hRgn2,RGN_XOR);     bmp1->PixelFormat = pf24bit;
 bmp1->Width       = Bmp->Width;
 bmp1->Height      = Bmp->Height;
 bmp1->Transparent = true;     for(int y=0;yHeight;y  )
 {
   ptr1=(byte *)(bmp1->ScanLine[y]);
   ptr2=(byte *)(Bmp->ScanLine[y]);
   for(int x=0;xWidth;x  )
   {
      if (PtInRegion(MyRgn,x,y))
      {
       ptr1[3*x] = ptr2[3*x];
       ptr1[3*x 1] = ptr2[3*x 1];
       ptr1[3*x 2] = ptr2[3*x 2];
      }
   }
 }     Canvas->Draw(200,200,bmp1);     //完成繪出戒指後，逐一釋放區域物件;
 ::DeleteObject(hRgn1);
 ::DeleteObject(hRgn2);
 ::DeleteObject(MyRgn);
}