MFC 直线 虚线 折线 圆 椭圆 矩形 弧形

****Dlg.h头文件加入：

//为project加入画笔、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构造函数改动：

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---參数：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DC
	DrawLine(&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();
	}
}

定义画图函数：

//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DC
		pDC->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);//每次画图右移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);//每次画图右移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);
}

执行效果：