bitblt.cpp

C＋＋Builder的单个小程许

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

#include <vcl.h>
#pragma hdrstop

#include "BitBlt.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button1Click(TObject *Sender)
{
int i,X0,Y0,RatioX,RatioY;
double MidX,MidY;
const Step=200;
Graphics::TBitmap*Bitmap;
Bitmap=new Graphics::TBitmap;
Bitmap->LoadFromFile("c:\\winnt\\Soap Bubbles.bmp");
X0=Width/2;
Y0=Height/2;
RatioX=Bitmap->Width /Step;
RatioY=Bitmap->Height /Step;
for(i=0;i<=Step;i++)
{
        Sleep(1);
        MidX=RatioX*i*0.5;
        MidY=RatioY*i*0.5;
        BitBlt(Form1->Canvas->Handle,X0-MidX,Y0-MidY,RatioX*i,RatioY*i,Bitmap->Canvas->Handle,X0-MidX,Y0-MidY,SRCCOPY);
}
delete Bitmap;
}
//---------------------------------------------------------------------------