vc++绘图程序（界面+代码）

利用vc++编写的绘图界面如下图所示，关于画笔画刷以及颜色控制任何关于VC++程序开发的书籍中都能找到资料。

绘图函数程序如下：

CPaintDC dc(this); // device context for painting
	// TODO: 在此处添加消息处理程序代码
	// 不为绘图消息调用CDialog::OnPaint()

	ADOConn m_ado;
	m_ado.OnnitADOConn();
	_RecordsetPtr m_precord;


	CRect rect;
	GetClientRect(&rect);

	CBrush myBrush;
	myBrush.CreateSolidBrush(RGB(255, 255, 255));//或者myBrush.CreateHatchBrush(HS_CROSS, RGB(55, 0, 0));
	dc.FillRect(&rect, &myBrush);


	CDC *p=this->GetDC();
	CPen pen;
	pen.CreatePen(PS_SOLID,1.7,RGB(0,0,0));

	::SelectObject(p->GetSafeHdc(),pen);

	p->SetBkMode(TRANSPARENT);

	int left=40;
	int right=rect.right-47;
	int top=50;
	int bottom=rect.bottom-80;
	//画坐标轴直线

	p->MoveTo(left,top);
	p->LineTo(left,bottom);
	p->LineTo(right,bottom);
	p->LineTo(right,top);
	p->LineTo(left,top);


	int tempX=(right-left)/10;
	CPen pen1;
	pen1.CreatePen(PS_DASHDOT,1.7,RGB(0,0,0));

	::SelectObject(p->GetSafeHdc(),pen1);

	double startFrc=0;
	double endFrec=0;

	CString sqlt="select * from CanShu where Type='X1'" ;
	m_precord=m_ado.GetRecordSet(_bstr_t(sqlt));
	startFrc=m_precord->GetCollect("Value");

	sqlt="select * from CanShu where Type='X2'" ;
	m_precord=m_ado.GetRecordSet(_bstr_t(sqlt));
	endFrec=m_precord->GetCollect("Value");


	double tempXFrec=(endFrec-startFrc)/10;

	for (int i=0;i<11;i++)
	{

		p->MoveTo(left+tempX*i,bottom);
		p->LineTo(left+tempX*i,top);

		double xlable=startFrc+i*tempXFrec;
		CString s;
		s.Format("%.2f",xlable);
		p->TextOut(left+i*tempX,bottom,s);
	}
	//CString sR;
	//sR.Format("%.2f",endFrec);
	//p->TextOut(left+10*tempX,bottom,sR);



	double topdb=0;
	double downdb=0;

	sqlt="select * from CanShu where Type='Y1'" ;
	m_precord=m_ado.GetRecordSet(_bstr_t(sqlt));
	topdb=m_precord->GetCollect("Value");//最上面的电平值参考电平

	sqlt="select * from CanShu where Type='Y2'" ;
	m_precord=m_ado.GetRecordSet(_bstr_t(sqlt));
	downdb=m_precord->GetCollect("Value");//原点的电平值

	double tempYdb=(topdb-downdb)/10;
	int tempY=(bottom-top)/10;
	for (int j=0;j<10;j++)
	{

		p->MoveTo(left,bottom-j*tempY);
		p->LineTo(right,bottom-j*tempY);

		if (j!=0)
		{
			CString s;
			s.Format("%.2f",downdb+j*tempYdb);
			p->TextOut(left+5,bottom-j*tempY,s);
		}

	}

	CString sT;
	sT.Format("%.2f",topdb);
	p->TextOut(left+5,bottom-10*tempY,sT);
	p->TextOut(left-30,bottom-10*tempY,"Ref");

	CString span;
	span.Format("%.2f",endFrec-startFrc);
	p->TextOut(left+5*tempX,bottom+tempY/3,"");
	p->TextOut(left+5*tempX,bottom+tempY,"SPAN:0 HZ");
	p->TextOut(left+10*tempX,bottom+tempY/3,"s");
	p->TextOut(left,top-20,"dbm");


	//取数据画图
	CPen pen2;
	pen2.CreatePen(PS_SOLID,1.7,RGB(255,0,0));

	::SelectObject(p->GetSafeHdc(),pen2);


	CString sql="select * from data order by Frec asc" ;

	m_precord=m_ado.GetRecordSet(_bstr_t(sql));
	int xData=0;
	int yData=0;
	double Frec=0;
	double Result=0;
	int flag=0;
	//p->MoveTo(left,bottom);
	while (m_ado.m_pRecordSet->adoEOF==0)
	{

		Frec=m_precord->GetCollect("Frec");
		Result=m_precord->GetCollect("Result");

		xData=(right-left)*(Frec-startFrc)/(endFrec-startFrc);
		yData=(bottom-top)*(Result-downdb)/(topdb-downdb);

		if (flag==0)
		{
			p->MoveTo(left+xData,bottom-yData);
			flag=1;
		}
		else
		{
			p->LineTo(left+xData,bottom-yData);

		}
		/*if (Frec==startFrc)
		{
		p->MoveTo(left+xData,bottom-yData);
		}
		else
		p->LineTo(left+xData,bottom-yData);*/

		m_precord->MoveNext();
	}
	m_ado.ExitConnect();