MFC图形界面绘制坐标系及正弦曲线

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项目名：XOY2

void CXOY2View::OnDraw(CDC* pDC)

{

CXOY2Doc* pDoc = GetDocument();

ASSERT_VALID(pDoc);

if (!pDoc)

return;

CRect rectClient;

GetClientRect(rectClient);

pDC->SetMapMode(MM_ANISOTROPIC);

pDC->SetWindowExt(1000,1000);

pDC->SetViewportExt(rectClient.right,-rectClient.bottom);

pDC->SetViewportOrg(rectClient.right/2,rectClient.bottom/2);

pDC->MoveTo(-500,0);

pDC->LineTo(500,0);//绘制X轴

pDC->LineTo(490,10);

pDC->MoveTo(500,0);

pDC->LineTo(490,-10);//绘制x轴箭头

for(int i=-5;i<=5;i++)

{

pDC->MoveTo(100*i,-5);

pDC->LineTo(100*i,5);

CString Str;

Str.Format(_T("%d"),i);

if(i!=0)

{

pDC->TextOut(100*i-5,-10,Str);

}

}//绘制X轴坐标尺

pDC->MoveTo(0,-500);

pDC->LineTo(0,500);//绘制Y轴

pDC->LineTo(-10,490);

pDC->MoveTo(0,500);

pDC->LineTo(10,490);//绘制y轴箭头

for(int i=-5;i<=5;i++)

{

pDC->MoveTo(-5,100*i);

pDC->LineTo(5,100*i);

CString Str;

Str.Format(_T("%d"),i);

pDC->TextOut(-20,100*i-5,Str);

}//绘制Y轴坐标尺

pDC->TextOut(490,-40,_T("X"));

pDC->TextOut(-40,490,_T("Y"));​



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);

double y,radian; 

pDC->SelectObject(&pen_sinx);

for(int x=-500;x<500;x++)

{

   //弧度=X坐标/曲线宽度*角系数*π

   //Y坐标=振幅*曲线宽度*sin(弧度)

radian =x/((double)314.159)*3.14159;

y=sin(radian)*100;

pDC->MoveTo((int)x,(int)y);

pDC->LineTo((int)x,(int)y);

}

pen_sinx.DeleteObject();

pen_Zuobixi.DeleteObject();

}

运行结果如下：​