MFC 直线 虚线 折线 圆 椭圆 矩形 弧形

****Dlg.h头文件添加：

//为工程添加画笔、点变量数组public:CPen m_pen[5];CPoint m_point[5];public:void DrawLine(CDC *pDC);void DrawPolyline(CDC *pDC);void DrawPolygon(CDC *pDC);void DrawRect(CDC *pDC);void DrawRoundRect(CDC *pDC);void DrawEllipse(CDC *pDC);void DrawArc(CDC *pDC);void DrawAngleArc(CDC *pDC);

****Dlg.cpp构造函数修改：

CLineTestDlg::CLineTestDlg(CWnd* pParent /*=NULL*/): CDialogEx(CLineTestDlg::IDD, pParent){m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);//初始化画笔、点变量数组m_pen[0].CreatePen(PS_SOLID,1,RGB(255,0,0)); //红色实线，1像素宽---参数：样式、宽度、颜色m_pen[1].CreatePen(PS_SOLID,6,RGB(0,255,0)); //绿色实线，6像素宽m_pen[2].CreatePen(PS_DASH,1,RGB(255,0,0)); //红色虚线，必须为一个像素宽m_pen[3].CreatePen(PS_DOT,1,RGB(0,0,255)); //蓝色点线，必须为一个像素宽m_pen[4].CreatePen(PS_DASHDOTDOT,1,RGB(255,0,0));//红色双点虚线，必须为一个像素宽//绘制多边形的点数组m_point[0].x=10;m_point[0].y=100;m_point[1].x=10;m_point[1].y=120;m_point[2].x=100;m_point[2].y=105;m_point[3].x=170;m_point[3].y=120;m_point[4].x=170;m_point[4].y=100;}

***Dlg.cpp       onpaint函数

void CLineTestDlg::OnPaint(){CPaintDC dc(this); // 用于绘制的设备上下文CBrush brush(RGB(190,190,190));//画刷dc.SelectObject(&brush);//将画刷选入DCDrawLine(&dc);DrawPolyline(&dc);DrawPolygon(&dc);DrawRect(&dc);DrawRoundRect(&dc);DrawEllipse(&dc);DrawArc(&dc);DrawAngleArc(&dc);if (IsIconic()){CPaintDC dc(this); // 用于绘制的设备上下文SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);// 使图标在工作区矩形中居中int cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// 绘制图标dc.DrawIcon(x, y, m_hIcon);}else{CDialogEx::OnPaint();}}

定义绘图函数：

//绘制直线函数void CLineTestDlg::DrawLine(CDC *pDC){CPen *oldPen=pDC->SelectObject(&m_pen[0]);//保存DC原始画笔for(int i=0;i<5;i++){pDC->SelectObject(&m_pen[i]);//将画笔选入DCpDC->MoveTo(20,20+i*15);//设置DC当前点pDC->LineTo(170,20+i*15);//绘制直线}pDC->SelectObject(oldPen);//回复DC原画笔}//绘制折线void CLineTestDlg::DrawPolyline(CDC *pDC){CPen *oldPen=pDC->SelectObject(&m_pen[0]);//保存DC原始画笔for(int i=0;i<5;i++){for(int j=0;j<5;j++){m_point[j].y+=35;//每次下移35个像素}pDC->SelectObject(&m_pen[i]);pDC->Polyline(m_point,5);}pDC->SelectObject(oldPen);}//绘制多边形void CLineTestDlg::DrawPolygon(CDC *pDC){for(int j=0;j<5;j++)m_point[j].y+=75;//数组中的点下移75个像素CPen *oldPen=pDC->SelectObject(&m_pen[0]);//保存DC原始画笔for(int i=0;i<5;i++){for(int j=0;j<5;j++){m_point[j].y+=35;//每次绘制图形下移35个像素}pDC->SelectObject(&m_pen[i]);pDC->Polygon(m_point,5); //绘制多边形}pDC->SelectObject(oldPen);}//绘制矩形void CLineTestDlg::DrawRect(CDC *pDC){CRect rect(150,20,220,80);CPen *oldPen=pDC->SelectObject(&m_pen[0]);for(int i=0;i<5;i++){rect.OffsetRect(80,0);//每次绘图右移80个像素pDC->SelectObject(&m_pen[i]);pDC->Rectangle(&rect);//绘制矩形}pDC->SelectObject(oldPen);}//绘制圆角矩形void CLineTestDlg::DrawRoundRect(CDC *pDC){CRect rect(150,150,220,230);CPen *oldPen=pDC->SelectObject(&m_pen[0]);for(int i=0;i<5;i++){rect.OffsetRect(80,0);//每次绘图右移80个像素pDC->SelectObject(&m_pen[i]);pDC->RoundRect(&rect,CPoint(15,15));}pDC->SelectObject(oldPen);}//绘制椭圆void CLineTestDlg::DrawEllipse(CDC *pDC){CRect rect(150,260,220,310);CPen *oldPen=pDC->SelectObject(&m_pen[0]);for(int i=0;i<5;i++){rect.OffsetRect(80,0);pDC->SelectObject(&m_pen[i]);pDC->Ellipse(&rect);}pDC->SelectObject(oldPen);}//绘制弧线void CLineTestDlg::DrawArc(CDC *pDC){CRect rect(150,400,220,460);CPoint ptStart(170,440);CPoint ptEnd(210,400);CPen *oldPen=pDC->SelectObject(&m_pen[0]);for(int i=0;i<5;i++){rect.OffsetRect(80,0);ptStart+=CPoint(80,0);ptEnd+=CPoint(80,0);pDC->SelectObject(&m_pen[i]);pDC->Arc(&rect,ptStart,ptEnd);}pDC->SelectObject(oldPen);}//绘制直线与弧线void CLineTestDlg::DrawAngleArc(CDC *pDC){CRect rect(150,500,220,560);CPoint ptCenter(185,600);CPoint ptStart(150,630);int r=30;float angleStart=0;float angleEnd=180;CPen *oldPen=pDC->SelectObject(&m_pen[0]);for(int i=0;i<5;i++){rect.OffsetRect(80,0);ptStart+=CPoint(80,0);pDC->MoveTo(ptStart);pDC->SelectObject(&m_pen[i]);pDC->AngleArc(ptCenter.x,ptCenter.y,r,angleStart,angleEnd);}pDC->SelectObject(oldPen);}

运行效果：