void CMFCApplication3View::OnDraw(CDC* pDC){ CMFCApplication3Doc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; CPen cpen, pen; pen.CreatePen(PS_DASH, 4, RGB(0, 0, 0));  //建立畫筆 cpen.CreatePen(PS_DASH, 2, RGB(0, 0, 255)); pDC->SelectObject(&cpen);       pDC->SetViewportOrg(200, 345);  //指定原點 pDC->SetTextColor(RGB(255, 0, 0)); CString sPITEX[] = { "-1/2π","","1/2π","π","3/2π","2π","5/2π","3π","7/2π","4π","9/2π","5π" }; for (int n = -1, nTmp = 0; nTmp < 660; n++, nTmp += 60) { pDC->LineTo(60 * n, 0); pDC->LineTo(60 * n, -5); pDC->MoveTo(60 * n, 0); pDC->TextOutA(60 * n - sPITEX[n + 1].GetLength() * 3, 16, sPITEX[n + 1]); } pDC->MoveTo(0, 0); CString sTmp; for (int n = -4, nTmp = 0; nTmp <= 180; n++, nTmp = 60 * n) { pDC->LineTo(0, 60 * n); pDC->LineTo(5, 60 * n); pDC->MoveTo(0, 60 * n); sTmp.Format("%d", -n); pDC->TextOutA(10, 60 * n, sTmp); } double y, radian; pDC->SelectObject(&pen); for (int x = -60; x < 600; x++) { radian = x / ((double)60 * 2)*3.1415; y = sin(radian) * 2 * 60; pDC->MoveTo((int)x, (int)y); pDC->LineTo((int)x, (int)y); } cpen.DeleteObject(); pen.DeleteObject(); // TODO: 在此處為本機數據添加繪制代碼}