unit2.cpp

<<C++Builder 6实用编程100例>>随书光盘

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

#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 BubbleThread::UpdateCaption()
//      {
//        Form1->Caption = "Updated in a thread";
//      }
//---------------------------------------------------------------------------

__fastcall BubbleThread::BubbleThread(bool CreateSuspended)
        : TThread(CreateSuspended)
{
}
//---------------------------------------------------------------------------
__fastcall BubbleThread::BubbleThread(TColor Mycolor, int XPos, int YPos,
   		bool CreateSuspended) : TThread(CreateSuspended)
{
        color=Mycolor;
        X=XPos;
        Y2=YPos;
        Y1=Y2;
}
//---------------------------------------------------------------------------
void __fastcall BubbleThread::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 BubbleThread::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);
}
//---------------------------------------------------------------------------