MFC單文檔如何畫正弦曲線

1、MFC單文檔如何畫正弦曲線1 .畫筆類，CPen,惟畫筆類的對(duì)象后，需要調(diào)用 CreatePen(兩數(shù)創(chuàng)建畫 筆。然后將其選入設(shè)備描述表中。pDC->SelectObject();2 .設(shè)置起點(diǎn)坐標(biāo)。在這里調(diào)用一個(gè)函數(shù)來(lái)設(shè)置坐標(biāo)原點(diǎn)。pDC->SetViewportOrg(100,255);3 .調(diào)用 LineTo(point),MoveTo(Point)函數(shù)畫圖。4.刪除創(chuàng)建的畫筆對(duì)象。pen.DeleteObject();以下是今天所寫的畫正弦函數(shù)的圖像。創(chuàng)建一個(gè)單文檔的應(yīng)用程序。并且在VIEW類中的OnDraw(。)函數(shù)里面做消息響應(yīng)。由于調(diào)用了sin()函數(shù)，所以要把mat

2、h.h 頭文件包含進(jìn)來(lái)。 #include "math.h"void CDrawSinXView:OnDraw(CDC* pDC)CDrawSinXDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);/ TODO:add draw code for native data here/ 建立畫筆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->Sel

3、ectObject(&pen_Zuobixi);/ 指定原點(diǎn)pDC->SetViewportOrg(100,255);pDC->SetTextColor(RGB(255,0,0);/ 繪制橫坐標(biāo)兀兀","兀兀"，"2兀兀"，"3兀兀","4兀兀"，"5兀"int n=-1;int nTemp=0;while (nTemp<=660)pDC->LineTo(60*n,0);pDC->LineTo(60*n,-5);pDC->MoveTo(60*

4、n,0);pDC->TextOut(60*n-sPITextn+1.GetLength()*3,16,sPITextn+1);n+;nTemp +=60;pDC->MoveTo(0,0);CString strTemp;/ 繪制縱坐標(biāo)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+)弧度=X坐標(biāo)/曲線寬度*角系數(shù)*兀/Y坐標(biāo)=振幅*曲線寬度*sin(弧度)radian =x/(double)60*2)*PI;y=sin(radian)*2*60;pDC->MoveTo(int)x,(int)y);pDC->Lin