VC++ MFC 画图 详解（附源码）

（1）新建 MFC aplication exe 文件：

painttool

（2）在CPaintoo1View类的 OnDraw方法 添加如下代码：

画图程序：

void CPaintoo1View::OnDraw(CDC* pDC)
{
    CPaintoo1Doc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
// TODO: add draw code for native data here
    CPen pen_zuobixi,pen_sinx;
    pen_zuobixi.CreatePen(PS_SOLID,4,RGB(0,0,0));
    pen_sinx.CreatePen(PS_SOLID,2,RGB(0,0,255));
    pDC->SelectObject(&pen_zuobixi);
    //指定原点
    pDC->SetViewportOrg(200,255);
    pDC->SetTextColor(RGB(255,0,0));
    CString sPIText[] = {"-1","0"," 1" , "2","3","4","5","6","7","8","9","10","11"};
    int n= -1;
    int nTemp = 0;
    while(nTemp<=660)
    {    pDC->LineTo(60*n,0);
        pDC->LineTo(60*n,-5);
        pDC->MoveTo(60*n,0);
        pDC->TextOut(60*n-sPIText[n+1].GetLength()*3,16,sPIText[n+1]);
        n++;
        nTemp+=60;
    }
    pDC->MoveTo(0,0);
    CString strTemp;

    for(n=-4,nTemp=0; nTemp<=180; n++,nTemp+=60){
        pDC->LineTo(0,60*n);
        pDC->LineTo(5,60*n);
        pDC->MoveTo(0,60*n);
        strTemp.Format("%d",-n);
        pDC->TextOut(10,60*n,strTemp);
    }
    double y,radian;
    pDC->SelectObject(&pen_sinx);
    for(int x=-60; x<600; x++)
    {
       radian = x/((double)6*2)*Pi;
    y=(radian*(-0.109417*radian+1.936310)+2.399982);
       pDC->MoveTo((int)x,(int)y);
       pDC->LineTo((int)x,(int)y);
    }
    pen_sinx.DeleteObject();

}

运行结果为：