vc++绘图程序（界面+代码）

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();