mythread.cpp

这是书上的代码

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

#include <vcl.h>
#pragma hdrstop
#include <math.h>
#include "mythread.h"
#include "animatefrm.h"
#pragma package(smart_init)

__fastcall AnimateThread::AnimateThread(bool CreateSuspended)
        : TThread(CreateSuspended)
{
        FreeOnTerminate=true;  //线程结束时自动删除
}
//---------------------------------------------------------------------------
void __fastcall AnimateThread::Execute()
{
        int     num=0;  //当前显示图片的序号
        int     steps=5; //用5步追到鼠标
        long    tick0,tick;
        int     Left,Top;
        POINT   cursorPt; //鼠标位置
        Left=Screen->Width;
        Top=Screen->Height;
        tick0=GetTickCount(); //读计时初值
        while(!aForm->End) {
         tick=GetTickCount(); //读计时当前值
         if(tick-tick0>100) {  //每秒更换图片10次
          aForm->Left=Screen->Width+20; //将窗口移出屏幕
          aForm->Top=Screen->Height+20;
          tick0=tick; //重置计时初值
          for(int i=0;i<IMAGECOUNT;i++)
           if(i==num) aForm->Images[i]->Visible=true;
           else aForm->Images[i]->Visible=false;
          num=(num+1)%IMAGECOUNT;  //num取值范围为0~图片总数-1
          GetCursorPos(&cursorPt);  //读鼠标位置
          //边界调整
          if(cursorPt.x>=Screen->Width-aForm->Width)
           cursorPt.x-=aForm->Width+16;
          if(cursorPt.y>=Screen->Height-aForm->Height)
           cursorPt.y-=aForm->Height+16;
          else cursorPt.y+=16; //避开鼠标热点
          Left+=(cursorPt.x-Left)/steps;
          Top+=(cursorPt.y-Top)/steps;
          aForm->Left=Left; aForm->Top=Top; //将窗口移入相应位置
         }
        }
}

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