sbqlei.cpp

采用定时器编写的简单示波器 很有参考价值

// sbqlei.cpp : implementation file
//

#include "stdafx.h"
#include "sbq.h"
#include "sbqlei.h"
#include "math.h"

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

#define PI 3.1415926535897932384626433832795
/////////////////////////////////////////////////////////////////////////////
// sbqlei

int zhenfu;                //振幅
double pinlv;              //频率
int xiangwei;              //相位

CRect	m_rectCurve;
CPen    m_PenCurve;
CPen    m_Penjixian;
CBrush  m_BkBrush;
//CBrush  m_CurveBrush;
CDC* pDC;

sbqlei::sbqlei()
{
	m_BkBrush.CreateSolidBrush(RGB(0,0,0));               //黑色背景刷
	m_Penjixian.CreatePen(PS_SOLID,1,RGB(255,255,255));   //画格子的笔
	m_PenCurve.CreatePen(PS_SOLID,2,RGB(0,255,0));        //画波形的笔
    
	zhenfu = 80;            //振幅
	pinlv=3.5;              //频率
	xiangwei=0;             //相位
}

sbqlei::~sbqlei()
{
}


BEGIN_MESSAGE_MAP(sbqlei, CStatic)
	//{{AFX_MSG_MAP(sbqlei)
	ON_WM_PAINT()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// sbqlei message handlers

void  sbqlei::DrawBack(CDC *pDC)            //刷背景和格子         
{
    CPen *pBcpen;
	LPRECT lpRect;
	lpRect = m_rectCurve;
	pDC->FillRect(&m_rectCurve,&m_BkBrush); //刷背景
	pBcpen=pDC->SelectObject(&m_Penjixian);
for(int t = 0; t<9; t++)                    //画竖线
	{
		pDC->MoveTo(t*(lpRect->right - lpRect->left)/8,0);
		pDC->LineTo(t*(lpRect->right - lpRect->left)/8,lpRect->bottom - lpRect->top);
	}
	for(int r = 0; r<5; r++)                //画横线
	{
		pDC->MoveTo(0,r*(lpRect->bottom - lpRect->top)/4);
		pDC->LineTo(lpRect->right - lpRect->left,r*(lpRect->bottom - lpRect->top)/4);
	}
	pBcpen->DeleteObject();                 //删除画笔
}

void sbqlei::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	// TODO: Add your message handler code here

    DrawBack(&dc);
	//DrawCurve(&dc);

	// Do not call CStatic::OnPaint() for painting messages
}

BOOL sbqlei::OnEraseBkgnd(CDC* pDC)         //自动填充背景
{
	// TODO: Add your message handler code here and/or call default
	CRect rect;
	GetClientRect(&rect);
	pDC->FillRect(&rect,&m_BkBrush);        //刷背景
	m_rectCurve = rect;	
	return CStatic::OnEraseBkgnd(pDC);
}


void sbqlei::DrawCurve(CDC *pDC,int s)            //画波形
{
				CPen *pBcpen;
				LPRECT lpRect;
				lpRect = m_rectCurve;
				pDC->FillRect(&m_rectCurve,&m_BkBrush);  //填充背景
				pBcpen=pDC->SelectObject(&m_Penjixian);
				for(int t = 0; t<9; t++)                 //画竖线
				{
					pDC->MoveTo(t*(lpRect->right - lpRect->left)/8,0);
					pDC->LineTo(t*(lpRect->right - lpRect->left)/8,lpRect->bottom - lpRect->top);
				}
				for(int r = 0; r<5; r++)                  //画横线
				{
					pDC->MoveTo(0,r*(lpRect->bottom - lpRect->top)/4);
					pDC->LineTo(lpRect->right - lpRect->left,r*(lpRect->bottom - lpRect->top)/4);
				}
				CPen *pCurvepen;
				pCurvepen=pDC->SelectObject(&m_PenCurve);
				for(int u = 0;u<(lpRect->right - lpRect->left);u++)  //画波形
				{
					pDC->MoveTo(u-1,-zhenfu*sin(pinlv*(u-1)*2*PI/500+s/10)+(lpRect->bottom-lpRect->top)/2);
					pDC->LineTo(u,-zhenfu*sin(pinlv*u*2*PI/500+s/10)+(lpRect->bottom-lpRect->top)/2);
				}	
}