C++开发-绘制正弦曲线

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通过OnDraw函数绘制图形

过程为先绘制两个坐标轴，再绘制正弦曲线的方法。其中将曲线分解为660个像素点，让其看起来更像“曲线”

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));      //建立画笔cpen.CreatePen(PS_DASH, 2, RGB(0, 0, 255));pDC->SelectObject(&cpen);                     pDC->SetViewportOrg(200, 345);       //指定原点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: 在此处为本机数据添加绘制代码}

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