c++ builder 怎么使用AlphaBlend函数啊

paopaotan 2010-11-11 02:16:46

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周药师 2010-11-11

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掉了一行了



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



#include <vcl.h>

#pragma hdrstop



#include "Unit1.h"

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

#pragma package(smart_init)

#pragma resource "*.dfm"

TForm1 *Form1;

Byte  Transparency ; //透明度

Graphics::TBitmap *Bit,*BitBack;

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

__fastcall TForm1::TForm1(TComponent* Owner)

	: TForm(Owner)

{

}

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

void __fastcall TForm1::FormCreate(TObject *Sender)

{

  BitBack =new  Graphics::TBitmap();

  BitBack->LoadFromFile("c:\\1.bmp");

  Brush->Bitmap = BitBack;





  Bit =new Graphics::TBitmap();

  Bit->LoadFromFile("c:\\2.bmp");

}

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

void __fastcall TForm1::Button2Click(TObject *Sender)

{

   TBlendFunction	Blend;

   Blend.BlendOp = AC_SRC_OVER;

   Blend.BlendFlags = 0;

   Blend.AlphaFormat = 0;

   Transparency = 100 ;  //透明度

   Blend.SourceConstantAlpha = Transparency;  //设置透明度

   ::AlphaBlend(Canvas->Handle,

					 10,

					 10,

					 Bit->Width + 10,

					 Bit->Height + 10,

					 Bit->Canvas->Handle,

					 0,

					 0,

					 Bit->Width,

					 Bit->Height,

                     Blend

					 );

}

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

void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)

{

  delete Bit;

  delete BitBack;

}

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

周药师 2010-11-11

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



#include <vcl.h>

#pragma hdrstop



#include "Unit1.h"

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

#pragma package(smart_init)

#pragma resource "*.dfm"

TForm1 *Form1;

Byte  Transparency ; //透明度

Graphics::TBitmap *Bit,*BitBack;

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

__fastcall TForm1::TForm1(TComponent* Owner)

	: TForm(Owner)

{

}

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

void __fastcall TForm1::FormCreate(TObject *Sender)

{

  BitBack =new  Graphics::TBitmap();

  BitBack->LoadFromFile("c:\\1.bmp");

  Brush->Bitmap = BitBack;





  Bit =new Graphics::TBitmap();

  Bit->LoadFromFile("c:\\2.bmp");

}

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

void __fastcall TForm1::Button2Click(TObject *Sender)

{

   Transparency = 255 ;

   TBlendFunction	Blend;

   Blend.BlendOp = AC_SRC_OVER;

   Blend.BlendFlags = 0;

   Blend.AlphaFormat = 0;

   ::AlphaBlend(Canvas->Handle,

					 10,

					 10,

					 Bit->Width + 10,

					 Bit->Height + 10,

					 Bit->Canvas->Handle,

					 0,

					 0,

					 Bit->Width,

					 Bit->Height,

                     Blend

					 );

}

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

void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)

{

  delete Bit;

  delete BitBack;

}

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