littlependlg.cpp

从学案例入手

// LittlePenDlg.cpp : implementation file
//

#include "stdafx.h"
#include "LittlePen.h"
#include "LittlePenDlg.h"

#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()

/////////////////////////////////////////////////////////////////////////////
// CLittlePenDlg dialog

CLittlePenDlg::CLittlePenDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CLittlePenDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CLittlePenDlg)
		// 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 CLittlePenDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CLittlePenDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

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

/////////////////////////////////////////////////////////////////////////////
// CLittlePenDlg message handlers

BOOL CLittlePenDlg::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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CLittlePenDlg::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 CLittlePenDlg::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);
		// 定义一个画笔数组
		CPen pen[8];
		// 创建实线画笔
		pen[0].CreatePen(PS_SOLID, 10, RGB(255, 0, 0));
		// 创建虚线画笔
		pen[1].CreatePen(PS_DASH, 1, RGB(0, 255, 0));
		// 创建点线画笔
		pen[2].CreatePen(PS_DOT, 1, RGB(0, 0, 255));
		// 创建点划线画笔
		pen[3].CreatePen(PS_DASHDOT, 1, RGB(0, 255, 255));
		// 创建双点划线画笔
		pen[4].CreatePen(PS_DASHDOTDOT, 1, RGB(255, 0, 255));
		// 创建空画笔
		pen[5].CreatePen(PS_NULL, 1, RGB(255, 255, 0));
		// 创建内侧实线画笔
		pen[6].CreatePen(PS_INSIDEFRAME, 10, RGB(0, 0, 0));
		// 创建具有刷子属性的几何画笔
		LOGBRUSH lb;
		lb.lbStyle=BS_HATCHED;
		lb.lbColor=RGB(128, 128, 128);
		lb.lbHatch=HS_DIAGCROSS;
		pen[7].CreatePen(PS_GEOMETRIC, 10, &lb);
		// 保存指向设备上下文原有画笔的指针
		CPen *pOldPen;
		// 以实线画笔绘制矩形
		pOldPen=dc.SelectObject(&pen[0]);
		dc.Rectangle(10, 10, 110, 110);
		// 以虚线画笔绘制矩形
		dc.SelectObject(&pen[1]);
		dc.Rectangle(130, 10, 230, 110);
		// 以点线画笔绘制矩形
		dc.SelectObject(&pen[2]);
		dc.Rectangle(250, 10, 350, 110);
		// 以点划线画笔绘制矩形
		dc.SelectObject(&pen[3]);
		dc.Rectangle(370, 10, 470, 110);
		// 以双点划线画笔绘制矩形
		dc.SelectObject(&pen[4]);
		dc.Rectangle(10, 130, 110, 230);
		// 以空画笔绘制矩形，因此该矩形不会被显示出来
		dc.SelectObject(&pen[5]);
		dc.Rectangle(130, 130, 230, 230);
		// 以内侧实线画笔绘制矩形，因此该矩形比使用实线画笔绘制的矩形看起来要小一些
		dc.SelectObject(&pen[6]);
		dc.Rectangle(250, 130, 350, 230);
		// 以具有刷子属性的几何画笔绘制矩形
		dc.SelectObject(&pen[7]);
		dc.Rectangle(370, 130, 470, 230);
		// 恢复设备上下文的原有画笔
		dc.SelectObject(pOldPen);
		// 删除所创建的画笔资源
		for (int i=0; i<8; i++)
			pen[i].DeleteObject();
		
		CDialog::OnPaint();
	}
}

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