CChartGrid类用来绘制波形区域中的表格，当绘制波形时波形就显示在这些表格上面。它处于该控件的区域，如下图所示： 

CChartGrid类的头文件。

#if !defined(AFX_CHARTGRID_H__ECCBEFF4_2365_49CD_A865_F1B4DD8CA138__INCLUDED_)#define AFX_CHARTGRID_H__ECCBEFF4_2365_49CD_A865_F1B4DD8CA138__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include "ChartObject.h"#include 
     
      class CChartAxis;class CChartGrid : public CChartObject  {    friend CChartAxis;public:    CChartGrid(CChartCtrl* pParent, bool bHoriz);    virtual ~CChartGrid();private:    void Draw(CDC* pDC);    void AddTick(int Position);    void ClearTicks();    std::list
      
        m_vecTickPos;    bool           m_bIsHorizontal;};#endif // !defined(AFX_CHARTGRID_H__ECCBEFF4_2365_49CD_A865_F1B4DD8CA138__INCLUDED_)
      
     

CChartGrid类的源文件。

#include "stdafx.h"#include "ChartGrid.h"#include "ChartAxis.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endifusing namespace std;//// Construction/Destruction//CChartGrid::CChartGrid(CChartCtrl* pParent, bool bHoriz)  : CChartObject(pParent), m_bIsHorizontal(bHoriz), m_vecTickPos(){    m_ObjectColor = RGB(128,128,128);}CChartGrid::~CChartGrid(){}void CChartGrid::AddTick(int Position){    m_vecTickPos.push_back(Position);}void CChartGrid::ClearTicks(){    m_vecTickPos.clear();}void CChartGrid::Draw(CDC *pDC){    if (!m_bIsVisible)        return;    if (!pDC->GetSafeHdc() )        return;    CPen* pOldPen;    CPen NewPen(PS_SOLID,0,m_ObjectColor);    pOldPen = pDC->SelectObject(&NewPen);    list
     
      ::iterator iter = m_vecTickPos.begin();    int ActuPosition = 0;    for (iter; iter!=m_vecTickPos.end(); iter++)    {        ActuPosition = *iter;        if (!m_bIsHorizontal)        {            int ActuX = m_ObjectRect.left;            while (true)            {                if (!Clip(ActuX,ActuPosition))                    break;                pDC->MoveTo(ActuX,ActuPosition);                ActuX += 3;                Clip(ActuX,ActuPosition);                pDC->LineTo(ActuX,ActuPosition);                ActuX += 3;            }        }        else        {            int ActuY = m_ObjectRect.bottom;            while (true)            {                if (!Clip(ActuPosition,ActuY))                    break;                pDC->MoveTo(ActuPosition,ActuY);                ActuY -= 3;                Clip(ActuPosition,ActuY);                pDC->LineTo(ActuPosition,ActuY);                ActuY -= 3;            }        }    }    pDC->SelectObject(pOldPen);    DeleteObject(NewPen);}
     

这里简单说一下，m_bIsHorizontal用来表示轴的水平与垂直，一开始对这个地方的理解有偏差，当为垂直轴的时候死活没办法理解为什么要累加ActuX的值，因为这明明是横向的嘛。后来意识到绘制的是跟纵轴相关的时候，这个地方就特别好理解了。