// drawLineView.h : interface of the CDrawLineView class
//
/////////////////////////////////////////////////////////////////////////////
#include <afxmt.h>

#if !defined(AFX_DRAWLINEVIEW_H__4E81C72C_AC7A_46F7_AEC0_D20264EFB297__INCLUDED_)
#define AFX_DRAWLINEVIEW_H__4E81C72C_AC7A_46F7_AEC0_D20264EFB297__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#define THREAD_NUM 3//线程个数

typedef struct{
 int m_nID;//标识是第几个启动的线程
 HWND m_hWnd;//为了画图，需传入视图类CDrawLineView的窗口句柄
}PARAM;

UINT DrawLine(LPVOID);//线程入口函数

class CDrawLineView : public CView
{
protected: // create from serialization only
 CDrawLineView();
 DECLARE_DYNCREATE(CDrawLineView)

// Attributes
public:
 CDrawLineDoc* GetDocument();
// Operations
public:

// Overrides
 // ClassWizard generated virtual function overrides
 //{{AFX_VIRTUAL(CDrawLineView)
 public:
 virtual void OnDraw(CDC* pDC);  // overridden to draw this view
 virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
 protected:
 //}}AFX_VIRTUAL

// Implementation
public:
 virtual ~CDrawLineView();

protected:

// Generated message map functions
protected:
 //{{AFX_MSG(CDrawLineView)
 afx_msg void OnDrawLineThread();
 afx_msg void OnUpdateDrawLineThread(CCmdUI* pCmdUI);
 afx_msg void OnDrawLineTimer();
 afx_msg void OnUpdateDrawLineTimer(CCmdUI* pCmdUI);
 //}}AFX_MSG
 DECLARE_MESSAGE_MAP()
public:
 CWinThread *m_pThread[THREAD_NUM];//创建线程后，产生的线程指针
public:
};

// drawLineView.cpp : implementation of the CDrawLineView class
//

#include "stdafx.h"
#include "drawLine.h"

#include "drawLineDoc.h"
#include "drawLineView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

////////////////////////////////////////////////////////////////////////////
// CDrawLineView

IMPLEMENT_DYNCREATE(CDrawLineView, CView)

BEGIN_MESSAGE_MAP(CDrawLineView, CView)
 //{{AFX_MSG_MAP(CDrawLineView)
 ON_COMMAND(ID_DRAW_LINE_THREAD, OnDrawLineThread)
 ON_UPDATE_COMMAND_UI(ID_DRAW_LINE_THREAD, OnUpdateDrawLineThread)
 ON_COMMAND(ID_DRAW_LINE_TIMER, OnDrawLineTimer)
 ON_UPDATE_COMMAND_UI(ID_DRAW_LINE_TIMER, OnUpdateDrawLineTimer)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView construction/destruction

CDrawLineView::CDrawLineView()
{
 // TODO: add construction code here
 for(int i=0;i<THREAD_NUM;i++){
  m_pThread[i]=NULL;//指向线程的批针初始化为零
 }
}

CDrawLineView::~CDrawLineView()
{
}

BOOL CDrawLineView::PreCreateWindow(CREATESTRUCT& cs)
{
 // TODO: Modify the Window class or styles here by modifying
 //  the CREATESTRUCT cs

 return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView drawing

void CDrawLineView::OnDraw(CDC* pDC)
{
 CDrawLineDoc* pDoc = GetDocument();
 ASSERT_VALID(pDoc);
 // TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView message handlers

void CDrawLineView::OnDrawLineThread()
{
 PARAM *m_pParam[THREAD_NUM]={NULL,NULL,NULL};//传入线种入口函数
                                              //的参数，初始化为空
 for(int i=0;i<THREAD_NUM;i++){
  
  m_pThread[i]=NULL;
  m_pParam[i]=new PARAM;
  memset((void*)m_pParam[i],0,sizeof(PARAM));//将为入口函数参数分配
               //的内存全部置0值
  //写入线程ID和窗口句柄
  m_pParam[i]->m_nID=i;
  m_pParam[i]->m_hWnd=GetSafeHwnd();
  //启动线程
  m_pThread[i]=AfxBeginThread(DrawLine,(LPVOID)(m_pParam[i]));
 }
}

void CDrawLineView::OnUpdateDrawLineThread(CCmdUI* pCmdUI)
{
 // TODO: Add your command update UI handler code here
 //若线程全部启动，菜单转为灰色（不可用）
 pCmdUI->Enable(m_pThread[0]==NULL&&
   m_pThread[1]==NULL&&
   m_pThread[2]==NULL);
}

void CDrawLineView::OnDrawLineTimer()
{
 // TODO: Add your command handler code here
 
}

void CDrawLineView::OnUpdateDrawLineTimer(CCmdUI* pCmdUI)
{
 // TODO: Add your command update UI handler code here
 
}

//定义入口函数
UINT DrawLine(LPVOID pParam)
{
 PARAM *m_pParam=(PARAM*)pParam;
 CBrush m_Brush;
 CWnd m_Wnd;
 CDC *m_Dc;

 //根据线程ID产生对应颜色的画刷
 if(m_pParam->m_nID==0)
 {
  m_Brush.CreateSolidBrush(RGB(255,0,0));
 }else if(m_pParam->m_nID==1){
  m_Brush.CreateSolidBrush(RGB(0,255,0));
 }else{
  m_Brush.CreateSolidBrush(RGB(0,0,255));
 }
 
 //根据窗口句柄，得到CDC
 m_Wnd.Attach(m_pParam->m_hWnd);
 m_Dc=m_Wnd.GetDC();
 CBrush *m_pOldBrush=(CBrush*)m_Dc->SelectObject(&m_Brush);
 
 //重复画矩形，每次前进一个像素
 for(int i=1;i<300;i++){
  m_Dc->Rectangle(10,35+m_pParam->m_nID*50,10+i,55+m_pParam->m_nID*50);
  Sleep(100);//让线程暂停100ms，是为了可以明显的看到三个线程是同时执行的
       //(至少我的肉眼看来是这样的，实际并非如此)
 }

 m_Dc->SelectObject(m_pOldBrush);
 m_Wnd.Detach();
 return 0;
}//DrawLine

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