C++MFC编程笔记day06 MFC向导、MFC绘图类使用

              CDC::FrameRgn

程序示例：

在****view类中，定义一个成员变量：

HMETAFILE m_hMetafile;

//功能实现部分主要代码

void CMFCdrawView::OnDcCwindowdc() 
{
	// TODO: Add your command handler code here
	CWindowDC dc(AfxGetMainWnd());
	dc.TextOut(0,0,"Hello CWindowDC");

}

void CMFCdrawView::OnDcCmetafiledc() 
{
	// TODO: Add your command handler code here
	//创建
	CMetaFileDC dc;
	dc.Create();
	//绘制命令
	dc.TextOut(100,100,"DcCmetafile");
	dc.MoveTo(150,150);
	dc.LineTo(200,200);
	//关闭，并返回句柄
	m_hMetafile= dc.Close();
	CClientDC dc2(this);
	dc2.PlayMetaFile(m_hMetafile);
}

void CMFCdrawView::OnDcCclientdc() 
{
	// TODO: Add your command handler code here
	CClientDC dc(this);
	dc.TextOut(0,0,"Hello CClientDC");
}

void CMFCdrawView::OnDcCdc() 
{
	// TODO: Add your command handler code here
	CDC dc;
	dc.CreateDC("DISPLAY",NULL,NULL,NULL);//打印到屏幕上
	RECT rc={0};
	rc.left=0;rc.right=200;rc.top=0;rc.bottom=100;
	dc.DrawText("hello cdc",&rc,DT_MODIFYSTRING);
	dc.DeleteDC();
}

void CMFCdrawView::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	dc.TextOut(0,20,"Hell0 Paint");
	//使用CMetaFile
	if(m_hMetafile)	dc.PlayMetaFile(m_hMetafile);
	//OnGdiBitmap();
	// Do not call CView::OnPaint() for painting messages
}

void CMFCdrawView::OnGdiBitmap() 
{
	// TODO: Add your command handler code here
	CClientDC dc(this);
	CDC dcBitmap;//内存dc
	dcBitmap.CreateCompatibleDC(&dc);
	CBitmap bmp;//位图对象
	bmp.LoadBitmap(IDB_BITMAP1);//插入的图片资源
	CBitmap*oldbmp=dcBitmap.SelectObject(&bmp);//放入内存dc
	//dc.BitBlt(300,300,110,37,&dcBitmap,0,0,SRCCOPY);//成像
	RECT rc={0};
	GetClientRect(&rc);
	//拉伸成像
	dc.StretchBlt(0,0,rc.right,rc.bottom,&dcBitmap,0,0,101,37,SRCCOPY);
	dcBitmap.SelectObject(oldbmp);
	dcBitmap.DeleteDC();//删除内存dc
	bmp.DeleteObject();//删除位图对象
	
}

void CMFCdrawView::OnGdiBrush() 
{
	// TODO: Add your command handler code here
	//CBrush brush(HS_CROSS,RGB(0,255,0));//普通画刷
	CBitmap bmp;bmp.LoadBitmap(IDB_BITMAP2);
	CBrush brush(&bmp);//位图画刷
	CClientDC dc(this);
	CBrush*oldbrush=dc.SelectObject(&brush);
	dc.RoundRect(50,50,220,220,2,2);
	dc.SelectObject(oldbrush);
	brush.DeleteObject();
	
}

void CMFCdrawView::OnGdiFont() 
{
	// TODO: Add your command handler code here
	CFont font;
	font.CreatePointFont(500,"黑体");
	CClientDC dc(this);
	CFont*oldfont=dc.SelectObject(&font);
	dc.TextOut(150,150,"OnGdiFont");
	dc.SelectObject(oldfont);
	font.DeleteObject();
}

void CMFCdrawView::OnGdiPen() 
{
	// 创建画笔
	CPen pen(PS_SOLID,5,RGB(255,0,0));
	//将画笔选择当前设备
	CClientDC dc(this);
	CPen * oldpen=dc.SelectObject(&pen);
	dc.TextOut(10,10,"OnGdiPen");
	dc.RoundRect(100,100,200,200,2,2);
	dc.SelectObject(oldpen);
	pen.DeleteObject();
	
}

void CMFCdrawView::OnGdiRgn() 
{
	CRgn rgn1,rgn2;
	//创建
	rgn1.CreateEllipticRgn(100,100,300,300);
	rgn2.CreateEllipticRgn(150,100,350,300);
    //几何运算
	rgn1.CombineRgn(&rgn1,&rgn2,RGN_XOR);
	//填充
	CClientDC dc(this);
	CBrush brush(RGB(255,0,0));
	CBrush brush2(RGB(0,0,255));
	dc.FillRgn(&rgn1,&brush);
	//dc.FillRgn(&rgn2,&brush2);
	//填充边框
	dc.FrameRgn(&rgn1,&brush2,5,1);
	//将窗口的区域设置成rgn1
	AfxGetMainWnd()->SetWindowRgn(rgn1,TRUE);
}

2、模拟绘图软件，鼠标点下进行绘图，放开则绘制指定的图形。

新建立 MFC 应用程序，并按照如下操作：

在****view 中，加入成员变量：

    CPoint m_ptBegin;//起点坐标
    CPoint m_ptEnd;//终点坐标
    UINT m_nType;//类型：1-直线，2-距形，3-圆
    BOOL m_bFlag;//是否开始画线

****view中主要实现代码：

//构造函数
CMFCdraw2View::CMFCdraw2View()
{
	// TODO: add construction code here
	m_nType=0;
	m_bFlag=FALSE;
	m_ptBegin=m_ptEnd=0;
}

void CMFCdraw2View::OnDrawElipse() 
{
	// TODO: Add your command handler code here
	m_nType=3;
}

void CMFCdraw2View::OnDrawLine() 
{
	// TODO: Add your command handler code here
	m_nType=1;
}

void CMFCdraw2View::OnDrawRect() 
{
	// TODO: Add your command handler code here
	m_nType=2;
}

void CMFCdraw2View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	m_bFlag=TRUE;//开始绘图
    m_ptBegin=m_ptEnd=point; //确定起点位置 
	CView::OnLButtonDown(nFlags,point);
}


void CMFCdraw2View::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	m_bFlag=FALSE;//结束画线
	CView::OnLButtonUp(nFlags, point);
}

void CMFCdraw2View::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CClientDC dc(this);
	if(m_bFlag)
	{
		//擦线
		DrawShape(&dc,m_ptBegin,m_ptEnd);
		//画线
		DrawShape(&dc,m_ptBegin,point);
		//保存终点位置，为擦线准备
		m_ptEnd=point;
    }
	CView::OnMouseMove(nFlags, point);
}
void CMFCdraw2View::DrawShape(CDC *pDC, CPoint p1, CPoint p2)
{
	//设置绘图模式，R2_NOT与当前画线处颜色相反
	pDC->SetROP2(R2_NOT);
	//设置画刷为透明画刷
	CBrush *pOldBrush=
		(CBrush*)pDC->SelectStockObject(NULL_BRUSH);
	switch (m_nType)
	{
	case 1://直线
		pDC->MoveTo(p1);
		pDC->LineTo(p2);
		break;
	case 2://矩形
		pDC->Rectangle(p1.x,p1.y,p2.x,p2.y);
		break;
	case 3://椭圆
		pDC->Ellipse(p1.x,p1.y,p2.x,p2.y);
		break;
	}
	//恢复默认画刷
	pDC->SelectObject(pOldBrush);
	
}

void CMFCdraw2View::OnUpdateDrawElipse(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetRadio(m_nType==3);//更改选中的状态
}

void CMFCdraw2View::OnUpdateDrawLine(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetRadio(m_nType==1);
}

void CMFCdraw2View::OnUpdateDrawRect(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetRadio(m_nType==2);
}

效果：

C++MFC编程笔记day06 MFC向导、MFC绘图类使用,布布扣,bubuko.com

C++MFC编程笔记day06 MFC向导、MFC绘图类使用

原文：http://blog.csdn.net/pukuimin1226/article/details/38365671