u6_7_2.cpp

《C++ Builder 5程序设计——基础教学篇》程序源代码2.

//-----------------  u6_7_2  ----------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "u6_7_2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
Tf6_7_2 *f6_7_2;
//---------------------------------------------------------------------------
__fastcall Tf6_7_2::Tf6_7_2(TComponent* Owner)
        : TForm(Owner)
{
}
int is_odd;
//---------------------------------------------------------------------------

void __fastcall Tf6_7_2::tmrFlyTimer(TObject *Sender)
{
   if (is_odd % 2 == 1)
   {
      imgFly ->Picture= imgBird1->Picture;
      is_odd = is_odd + 1;
    }
   else
    {
     imgFly->Picture = imgBird2->Picture;
     is_odd = is_odd - 1;
    }
   imgFly->Left = imgFly->Left - 10;
   if(imgFly->Left <= -imgFly->Width)
     imgFly->Left = Width;
}
//---------------------------------------------------------------------------

void __fastcall Tf6_7_2::btnStartClick(TObject *Sender)
{
  imgFly->Left = 300;
  imgFly->Top = 10;
  imgBird1->Visible = false;
  imgBird2->Visible = false;
  tmrFly->Interval = 150;
  is_odd = 1;
}
//---------------------------------------------------------------------------
void __fastcall Tf6_7_2::btnEndClick(TObject *Sender)
{
  Close();
}
//---------------------------------------------------------------------------