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首先需要澄清的是，接下来的程序并不完全是尽点力先生所写，很多事参照wince高级编程的书写的，有什么错误还请多多包涵，希望通过解释，能给读者一点帮助，先生最近在做关于将测试到的温度数据，通过万硅电子的无线通信模块，无线传输到开发板上面，然后通过接下来的程序显示出温度变化曲线，希望想做同样实验的人多看一下，这个实验解决了传统的有线通信和曲线画法的难度。 下面我将着重介绍这个画曲线的类，看之前先学习一下C++，知道什么是类，怎样使用类，怎么样声明对象。

 // 2DGraph.cpp : 实现文件
 //

 #include "stdafx.h"
 #include "wenkong.h"
 #include "2DGraph.h"

 // C2DGraph

 IMPLEMENT_DYNAMIC(C2DGraph, CWnd)

 C2DGraph::C2DGraph()
 {
  m_crBackColor =RGB(0,0,0);//控件背景颜色
  m_crGridColor =RGB(0,255,255);//表格边框颜色
  m_crLineColor =(255,0,255);//曲线颜色
  m_crTextColor =(255,0,255);//输出文本颜色

  m_dXMaxValue =100 ;//x轴最大值
  m_dXMinValue =0 ;//x轴最小值
  m_dYMaxValue =100;//Y最大值
  m_dYMinValue =0;//Y最小值
  m_strXCaption =_T("时间轴");
  m_strYCaption =_T("温度");

 m_pOldBitmapGrid = NULL;
 m_pOldBitmapLine = NULL;
 }

  C2DGraph::~C2DGraph()
 {
    if (m_dcGrid.GetSafeHdc()!= NULL)
  {
     m_dcGrid.SelectObject(m_pOldBitmapGrid);
  }

    if(m_dcLine.GetSafeHdc()!= NULL)
    {
   m_dcLine.SelectObject(m_pOldBitmapLine);
    }
 }

  BOOL C2DGraph:: Create(LPCTSTR lpszClassName,LPCTSTR lpszWindowName,double dwStyle,const RECT& rect,CWnd* pParentWnd,UINT nID,CCreateContext* pContext)
 {
   BOOL result;//注册窗类体
   static CString className = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW);//创建窗体类
   result = CWnd::CreateEx(WS_EX_CLIENTEDGE | WS_EX_STATICEDGE,
   className,NULL,dwStyle,
   rect.left,rect.top,rect.right-rect.left,rect.bottom-rect.top,pParentWnd->GetSafeHwnd(),(HMENU)nID);
   return TRUE;
 }

  CPoint C2DGraph::GpToSp(CPoint& point)
 {
  CPoint rPoint;
  CRect rectClient;
  CRect rectLine;

  GetClientRect(rectClient);
  rectLine.left = rectClient.left +20;
  rectLine.right = rectClient.right +20;
  rectLine.top =rectClient.top + 10;
  rectLine.bottom =rectClient.bottom -20;
  rPoint.x = rectLine.left +(point.x / (m_dXMaxValue - m_dXMinValue))*rectLine.Width();
  rPoint.y = rectLine.top +(1-point.y / (10*m_dYMaxValue - 10*m_dYMinValue))*rectLine.Height();
  return rPoint;

 }

 void C2DGraph::InvalidateCtrl()
 {
   CPen *oldPen;
   CPen solidPen(PS_SOLID,0,m_crGridColor);
   CFont xFont,yFont,*oldFont;
   CBrush brushBack;
   brushBack.CreateSolidBrush(m_crBackColor);
   CRect rectClient;
   GetClientRect(rectClient);
   CClientDC dc(this);

   //创建表格设备环境并创建相应缓冲区
   if(m_dcGrid.GetSafeHdc()==NULL)
  {
    m_dcGrid.CreateCompatibleDC(&dc);
    m_bitmapGrid.CreateCompatibleBitmap(&dc,rectClient.Width(),rectClient.Height());
    m_pOldBitmapGrid = m_dcGrid.SelectObject(&m_bitmapGrid);
  }
  

   //设置背景颜色
   m_dcGrid.SetBkColor(m_crBackColor);
   m_dcGrid.FillRect(rectClient,&brushBack);

   //画边框
   oldPen = m_dcGrid.SelectObject(&solidPen);
   m_dcGrid.MoveTo(rectClient.left +20,rectClient.top +10);
   m_dcGrid.LineTo(rectClient.right -10,rectClient.top +10);
   m_dcGrid.LineTo(rectClient.right -10,rectClient.bottom -20);
   m_dcGrid.LineTo(rectClient.left +20,rectClient.bottom -20);
   m_dcGrid.LineTo(rectClient.left +20,rectClient.top +10);

   //还原GDI对象
   m_dcGrid.SelectObject(oldPen);

   //创建Y轴字
   yFont.CreateFont(14,0,900,0,300,FALSE,FALSE,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH | FF_SWISS,_T("宋体"));

   //创建X轴字体
   xFont.CreateFont(14,0,0,0,300,FALSE,FALSE,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH | FF_SWISS,_T("宋体"));

   //画Y坐标标题
   m_dcGrid.SetTextColor(m_crTextColor);
   oldFont = m_dcGrid.SelectObject(&yFont);
   m_dcGrid.ExtTextOut(rectClient.left +2,(rectClient.top +rectClient.bottom)/2 +5,ETO_CLIPPED,NULL,m_strYCaption,wcslen(m_strYCaption),NULL);
  

   //画Y坐标最大值
   CString strTmp;
   strTmp.Format(_T("%.2f"),m_dYMaxValue);
   m_dcGrid.ExtTextOut(rectClient.left +5,rectClient.top +40,ETO_CLIPPED,NULL,strTmp,strTmp.GetLength(),NULL);

   //画Y坐标最小值
   strTmp.Format(_T("%.2f"),m_dYMinValue);
   m_dcGrid.ExtTextOut(rectClient.left +5,rectClient.bottom -18,ETO_CLIPPED,NULL,strTmp,strTmp.GetLength(),NULL);

   //还原GDI对象
   m_dcGrid.SelectObject(oldPen);

   //画X坐标标题
   oldFont = m_dcGrid.SelectObject(&xFont);
   m_dcGrid.ExtTextOut((rectClient.left +rectClient.right)/2 -5, rectClient.bottom -18,ETO_CLIPPED,NULL,m_strXCaption,wcslen(m_strXCaption),NULL);
  

   //画X坐标最大值
   strTmp.Format(_T("%.2f"),m_dXMaxValue);
   m_dcGrid.ExtTextOut(rectClient.right -40,rectClient.bottom -18,ETO_CLIPPED,NULL,strTmp,strTmp.GetLength(),NULL);

  //画X坐标最小值
  strTmp.Format(_T("%.2f"),m_dXMinValue);
  m_dcGrid.ExtTextOut(rectClient.left +20,rectClient.bottom -18,ETO_CLIPPED,NULL,strTmp,strTmp.GetLength(),NULL);

  //还原GDI对象
  m_dcGrid.SelectObject(oldPen);

 //创建画线设备环境并创建相应缓冲区
 if(m_dcLine.GetSafeHdc()==NULL)
 {
   m_dcLine.CreateCompatibleDC(&dc);
   m_bitmapLine.CreateCompatibleBitmap(&dc,rectClient.Width(),rectClient.Height());
   m_pOldBitmapLine =m_dcLine.SelectObject(&m_bitmapLine);
 }

   m_dcLine.SetBkColor(m_crBackColor);
   m_dcLine.FillRect(rectClient,&brushBack);

 //删除创建的GDI对象
 solidPen.DeleteObject();
 xFont.DeleteObject();
 yFont.DeleteObject();
 brushBack.DeleteObject();

 }

 void C2DGraph::DrawPoints()
 {

  CPen *oldPen;
  CRect rectCleanUp;
  CPoint points[2];
  CPoint point_old;
  CPen penLine;

  //创建画笔
  penLine.CreatePen(PS_SOLID,0,m_crLineColor);

  //得到绘图区域
  CRect rectClient;
  GetClientRect(rectClient);

  m_dcLine.FillSolidRect(rectClient,m_crBackColor);
  int i =0;
  oldPen =m_dcLine.SelectObject(&penLine);

  if(m_dcLine.GetSafeHdc()==NULL)
  {
    return;
  }
 

 //绘制曲线
  if(m_lstPointsY.GetCount()==0)
  {
   ;
  }

 //如果是一个点
 else if(m_lstPointsY.GetCount()==1)
    {
  POSITION pos =m_lstPointsY.GetHeadPosition();
  points[0].x =0;//表示第一个点
  points[0].y =m_lstPointsY.GetAt(pos);
  points[0] =GpToSp(points[0]);//转换成屏幕坐标
  m_dcLine.SetPixel(points[0],m_crLineColor);
  }
 else //如果多余或等于两个点
   {
  POSITION pos =m_lstPointsY.GetHeadPosition();
  points[0].y =m_lstPointsY.GetNext(pos);
  points[0].x =0;//表示第一个点
  point_old =points[0];
  i=0;
  while(TRUE)
  {
   if(pos==NULL)
      {
     break;
      }
   points[1] =point_old;
   points[0].y =m_lstPointsY.GetNext(pos);
   points[0].x =i+1;
   point_old =points[0];
   points[0] =GpToSp(points[0]);
   points[1] =GpToSp(points[1]);
   //绘制曲线
   m_dcLine.MoveTo(points[1].x,points[1].y);
   m_dcLine.LineTo(points[0].x,points[0].y);
   i++;
   }
  }
  m_dcLine.SelectObject(oldPen);
  //删除画笔ＧＤＩ对象
  penLine.DeleteObject();
 }

 void C2DGraph::OnPaint()
 {
    CPaintDC dc(this);
    CRect rectClient;
    GetClientRect(rectClient);
    CDC memDC;
    CBitmap memBitmap;
    CBitmap* oldBitmap;

    memDC.CreateCompatibleDC(&dc);
    memBitmap.CreateCompatibleBitmap(&dc,rectClient.Width(),rectClient.Height());
    oldBitmap =(CBitmap *)memDC.SelectObject(&memBitmap);

    //更新背景显示
    InvalidateCtrl();
    //画点
    DrawPoints();
    //将m_dcGrid和m_dcLine绘制到控件上
    if(memDC.GetSafeHdc()!=NULL)
    {
   memDC.BitBlt(0,0,rectClient.Width(),rectClient.Height(),&m_dcGrid,0,0,SRCCOPY);
   memDC.BitBlt(0,0,rectClient.Width(),rectClient.Height(),&m_dcLine,0,0,SRCPAINT);
   dc.BitBlt(0,0,rectClient.Width(),rectClient.Height(),&memDC,0,0,SRCCOPY);

    }
    memDC.SelectObject(oldBitmap);

 //删除内存位图GDI对象
    memBitmap.DeleteObject();
    //删除内存绘图环境
    memDC.DeleteDC();
 } void C2DGraph::AppendPoint(double dwPointY)//在末尾添加一个点
 {
   m_lstPointsY.AddTail(dwPointY);
   //更新显示
   Invalidate();
 }

  void C2DGraph::DeleteFirstPoint()
 {
 if(m_lstPointsY.GetCount()>0)
    {
    m_lstPointsY.RemoveHead();
    }
   //更新显示
  Invalidate();
 }

 BEGIN_MESSAGE_MAP(C2DGraph, CWnd)
 ON_WM_PAINT()

 END_MESSAGE_MAP()

// C2DGraph 消息处理程序