MFC绘制直角坐标系

 void CMyPicoTestDlg::DrawWave(CDC *pDC,CRect &rectPicture)
 {

     CPen newPen;                  //用于创建新画笔
     CPen *pOldPen;                  //用于存放旧画笔
     CBrush newBrush;              //用于创建新画笔
     CBrush *pOldBrush;            //用于存放旧画笔
         newBrush.CreateSolidBrush(RGB(,,));    //新建黑色画刷
     pOldBrush=pDC->SelectObject(&newBrush); //选择新画刷并将旧画刷的指针保存在pOldBrush
     pDC->Rectangle(rectPicture); //黑色画刷为绘图控件，形成黑色背景
     pDC->SelectObject(pOldBrush);//恢复旧画刷
     newBrush.DeleteObject(); //删除新画刷

     newPen.CreatePen(PS_SOLID,,RGB(,,));  //创建实心画笔，粗度为1，颜色为绿色
     pOldPen=pDC->SelectObject(&newPen);//选择新画笔，并将旧画笔的指针保存在pOldPen
 /************************************************************************/
 /* 坐标轴                                                               */
 /************************************************************************/
 //x轴
     pDC->MoveTo(,rectPicture.Height()/);
     pDC->LineTo(rectPicture.Width(),rectPicture.Height()/);
 //y轴
     pDC->MoveTo(rectPicture.Width()/,);
     pDC->LineTo(rectPicture.Width()/,rectPicture.Height());
 //x轴刻度

     for (int32_t i=rectPicture.Width()/-;i>;i-=)
     {
         pDC->MoveTo(i,rectPicture.Height()/);
         pDC->LineTo(i,rectPicture.Height()/-);
     }
     for (int32_t i=rectPicture.Width()/+;i<rectPicture.Width()+;i+=)
     {
         pDC->MoveTo(i,rectPicture.Height()/);
         pDC->LineTo(i,rectPicture.Height()/-);

     }
 //y轴刻度
     for (int32_t i=rectPicture.Height()/-;i>;i-=)
     {
         pDC->MoveTo(rectPicture.Width()/,i);
         pDC->LineTo(rectPicture.Width()/+,i);
     }
     for (int32_t
          i=rectPicture.Height()/+;i<rectPicture.Height();i+=)
     {
         pDC->MoveTo(rectPicture.Width()/,i);
         pDC->LineTo(rectPicture.Width()/+,i);
     }
     pDC->SelectObject(pOldPen);//恢复旧画笔
     newPen.DeleteObject();//删除新画笔
  }

调用

void CMyPicoTestDlg::OnBnClickedButton2()
{
    // TODO: 在此添加控件通知处理程序代码

    CRect rectPicture;
    m_picDraw.GetClientRect(&rectPicture);
       //绘制坐标系
    DrawWave(m_picDraw.GetDC(), rectPicture);

}