unit2.cpp

多线程实例

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

#include <vcl.h>
#pragma hdrstop

#include "Unit2.h"
#include "Unit1.h"
#pragma package(smart_init)
//---------------------------------------------------------------------------

//   Important: Methods and properties of objects in VCL can only be
//   used in a method called using Synchronize, for example:
//
//      Synchronize(UpdateCaption);
//
//   where UpdateCaption could look like:
//
//      void __fastcall Bubble::UpdateCaption()
//      {
//        Form1->Caption = "Updated in a thread";
//      }
//---------------------------------------------------------------------------

__fastcall Bubble::Bubble(bool CreateSuspended)
        : TThread(CreateSuspended)
{
}
//-----------------------------------------------
__fastcall Bubble::Bubble(TColor mycolor,int XPos,int YPos,bool CreateSuspended)
        : TThread(CreateSuspended)
{
color=mycolor;
X=XPos;
Y2=YPos;
Y1=Y2;
}
//---------------------------------------------------------------------------
void __fastcall Bubble::Execute()
{
        //---- Place thread code here ----
        Form1->Image1->Canvas->Pen->Color=clBlack;
        Form1->Image1->Canvas->MoveTo(X-1,0);
        Form1->Image1->Canvas->LineTo(X-1,260);
        Form1->Image1->Canvas->MoveTo(X+21,0);
        Form1->Image1->Canvas->LineTo(X+21,260);
        while(!Terminated)
        {
          Y1=Y2;
          Y2-=10;
          if(Y2<0)
            Y2=240;
          Synchronize(Paint);
          Sleep(20);
        }
}
//---------------------------------------------------------------------------
void __fastcall Bubble::Paint()
{
Form1->Image1->Canvas->Pen->Color=clWhite;
Form1->Image1->Canvas->Brush->Color=clWhite;
Form1->Image1->Canvas->Ellipse(X,Y1,X+20,Y1+20);
Form1->Image1->Canvas->Pen->Color=color;
Form1->Image1->Canvas->Brush->Color=color;
Form1->Image1->Canvas->Ellipse(X,Y2,X+20,Y2+20);
}
//------------------------------------------