Combining Images with Regions (C++Builder)

1.	Start C++ Builder.
2.	In the File menu, choose New Application.
3.	On the Builder toolbar, click the LEADTOOLS tab. If you have used a LEAD VCL control before, the icon appears on the toolbar. Otherwise, refer to Installing VCL before continuing with this tutorial.
4.	Add 2 of the LEAD Main VCL controls to your form. Size and position the controls, as you want them to appear at run time.
5.	Add a button to your form and name it as follows:
	Name	Caption
	btnCombine	Combine
6.	Handle the Form1 OnCreate event, and code FormCreate as follows:

void __fastcall TForm1::FormCreate(TObject *Sender)
{
LEADImage1->Load("r:\\images\\image1.cmp", 0, 1, 1);
LEADImage2->Load ("r:\\images\\image2.cmp", 0, 1, 1);
}

7.	Handle the btnCombine button's OnClick event, and code the btnCombineClick procedure as follows:

void __fastcall TForm1::btnCombineClick(TObject *Sender)
{
   int nDstLeft;
   int nDstTop;
   int nSrcLeft;
   int nSrcTop;
   int nDstWidth;
   int nDstHeight;
   TRect rClientArea;

::GetClientRect ( LEADImage1->Handle, &rClientArea );
   LEADImage1->SetRgnRect ( (int)(rClientArea.right/8), (int)(rClientArea.bottom/8), (int)(rClientArea.right/2), (int)(rClientArea.bottom/2), L_RGN_SET);

   nDstLeft  = (int)(LEADImage1->BitmapWidth /8 );
   nDstTop   = (int)(LEADImage1->BitmapHeight /8 );
   nDstWidth = (int)(LEADImage1->BitmapWidth );
   nDstHeight= (int)(LEADImage1->BitmapHeight );
   nSrcLeft  = 0;
   nSrcTop   = 0;

   LEADImage1->Combine( nDstLeft, nDstTop, nDstWidth, nDstHeight, LEADImage2->Bitmap, nSrcLeft, nSrcTop, CB_OP_ADD + CB_DST_0);
}

8.	Run your program to test it.