fontdemodlg.cpp

从学案例入手

// FontDemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "FontDemo.h"
#include "FontDemoDlg.h"

#include <math.h>
#define DegToRnd(x) (x/180.*3.14159)

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFontDemoDlg dialog

CFontDemoDlg::CFontDemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CFontDemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CFontDemoDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CFontDemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CFontDemoDlg)
	DDX_Control(pDX, IDC_LIST1, m_lstFont);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CFontDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CFontDemoDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFontDemoDlg message handlers

// 枚举字体时的回调函数，该函数将系统的所有可用字体及其字符集添加到列表框中，
// 由应用程序提供的参数 lParam 提供了指向该列表框的 CListBox 对象的指针

int WINAPI EnumFontFamProc(const LOGFONTA * lplf, const TEXTMETRICA *lptm, 
						   unsigned long FontType, LPARAM lParam)
{
	CListBox *pList=(CListBox*)lParam;
	CString str;
	// 将当前字体的字体名 (FaceName) 和字符集 (CharSet) 添加到列表框中
	str.Format("FACENAME: %s \tCHARSET: %d", lplf->lfFaceName, lplf->lfCharSet);
	pList->AddString(str);

	return TRUE; // 返回 TRUE 以继续字体枚举的过程，返回 FALSE 将终止字体枚举的过程
}


BOOL CFontDemoDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here


	// 更改列表框所用的字体为 9 磅 (12 象素) 大小的宋体
	static CFont font;
	font.CreatePointFont(90, "宋体");
	m_lstFont.SetFont(&font);
	// 设置列表框的制表符位置为 200 个对话框单位
	m_lstFont.SetTabStops(200);
	// 枚举当前系统的所有可用字体，将指向列表框的 CListBox 对象的指针作为应用程序提供的
	// 参数传递给枚举字体回调函数 EnumFontFamProc
	EnumFontFamilies(::GetDC(GetSafeHwnd()), NULL, EnumFontFamProc, (LPARAM)(&m_lstFont));
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CFontDemoDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CFontDemoDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		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;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		// 获得窗口的客户区设备上下文句柄
		CPaintDC dc(this);
		// 设置字体输出背景为透明
		dc.SetBkMode(TRANSPARENT);

		// 获得设备上下文所使用的当前字体
		LOGFONT lf;
		dc.GetCurrentFont()->GetLogFont(&lf);
		CFont font1, font2;
		CFont *pOldFont; // 保存设备上下文最初使用的字体对象

		// 创建 font1 为 12 象素宋体
		lf.lfCharSet=134;
		lf.lfHeight=-12;
		lf.lfWidth=0;
		strcpy(lf.lfFaceName, "宋体");
		font1.CreateFontIndirect(&lf);

		// 更改当前字体为 20 象素的 Times New Roman，并且向上倾斜 40 度
		lf.lfCharSet=0;
		strcpy(lf.lfFaceName, "Times New Roman");
		lf.lfEscapement=400;
		lf.lfHeight=-20;
		font2.CreateFontIndirect(&lf);
		pOldFont=dc.SelectObject(&font2);
		// 获得字符串 "lfEscapement= 400" 在输出时的宽度和高度
		CSize sz=dc.GetTextExtent("lfEscapement= 400");
		// 计算字符串合适的输出位置
		dc.TextOut(10, 10+int(sz.cx*sin(DegToRnd(40))), "lfEscapement= 400");

		// 将字体输出方向更改为向下倾斜 40 度
		lf.lfEscapement=-400;
		dc.SelectObject(pOldFont);
		font2.DeleteObject();
		font2.CreateFontIndirect(&lf);
		dc.SelectObject(&font2);
		// 计算字符串合适的输出位置
		dc.TextOut(290-int(sz.cx*cos(DegToRnd(40))), 10, "lfEscapement=-400");

		// 将字体输出方向更改为水平方向
		lf.lfEscapement=0;
		dc.SelectObject(pOldFont);
		font2.DeleteObject();
		font2.CreateFontIndirect(&lf);
		dc.SelectObject(&font2);
		// 对称于直线 x=150 输出字符串 "lfEscapement=0"
		sz=dc.GetTextExtent("lfEscapement=0");
		dc.TextOut(150-sz.cx/2, 110, "lfEscapement=0");

		// 更改当前字体为最细的 50 象素大小的宋体
		lf.lfCharSet=134;
		strcpy(lf.lfFaceName, "宋体");
		lf.lfEscapement=0;
		lf.lfWeight=0;
		lf.lfHeight=-50;
		dc.SelectObject(pOldFont);
		font2.DeleteObject();
		font2.CreateFontIndirect(&lf);
		dc.SelectObject(&font2);
		// 输出一个 "细" 字
		dc.TextOut(330, 10, "细");
		// 在旁边使用 12 象素大小的宋体字给出当前字体的重量
		dc.SelectObject(&font1);
		dc.TextOut(395, 29, "lfWeight=0");

		// 更改当前字体为最粗的 50 象素大小的字体
		lf.lfWeight=1000;
		dc.SelectObject(pOldFont);
		font2.DeleteObject();
		font2.CreateFontIndirect(&lf);
		dc.SelectObject(&font2);
		// 输出一个 "粗" 字
		dc.TextOut(330, 80, "粗");
		dc.SelectObject(&font1);
		// 在旁边使用 12 象素大小的宋体字给出当前字体和重量
		dc.TextOut(395, 99, "lfWeight=1000");
		// 恢复设备上下文原有的 GDI 绘图对象
		dc.SelectObject(pOldFont);

		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CFontDemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}