message2dlg.cpp

这是用VC编写的一个画圆和画方的小程序!还不是很完善!

// message2Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "message2.h"
#include "message2Dlg.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()

/////////////////////////////////////////////////////////////////////////////
// CMessage2Dlg dialog

CMessage2Dlg::CMessage2Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMessage2Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMessage2Dlg)
		// 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 CMessage2Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMessage2Dlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMessage2Dlg, CDialog)
	//{{AFX_MSG_MAP(CMessage2Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_KEYDOWN()
	ON_WM_KEYUP()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMessage2Dlg message handlers

BOOL CMessage2Dlg::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
	
	shape=CRect(100,100,200,200);
	m_chshape  = 'r';
	brushape.CreateSolidBrush(RGB(0,0,0));
	m_bstain = false;
    nflag =0;	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CMessage2Dlg::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 CMessage2Dlg::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
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMessage2Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
void CMessage2Dlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	Invalidate();
	CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}

void CMessage2Dlg::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	CWindowDC dc(this);
	m_bstain=TRUE;
	char ischar=char(nChar);
	dc.SelectObject(brushape);
	switch(ischar)
	{
		case 'r':
	    	case 'R':
			m_chshape='r';
			dc.Rectangle(&shape);
			break;
		case 'e':
	    	case 'E':
		    	m_chshape='e';
		    	dc.Ellipse(&shape);
		    	break;
	}	
	CDialog::OnKeyUp(nChar, nRepCnt, nFlags);
}

void CMessage2Dlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if (m_bstain)
	{
		m_nx=point.x-oldpoint.x;
		m_ny=point.y-oldpoint.y;
		m_bmove=FALSE; 
	}//以上几句代码暂时注释掉，在后面图形的移动中，要使用它们。
	if (Pinside(point))
		Invalidate();	
	CDialog::OnLButtonDown(nFlags, point);
}



void CMessage2Dlg::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if ( Pinside(point) && m_bstain)
	{
		switch(nflag)
		{
		case 0:
			brushape.Detach();
			brushape.CreateSolidBrush(RGB(0,0,0));
			nflag++;
			OnKeyUp(m_chshape, 1, 0);
			break;
		case 1:
			brushape.Detach();
			brushape.CreateSolidBrush(RGB(255,0,0));
			nflag++;
			OnKeyUp(m_chshape, 1, 0);
			break;
		case 2:
			brushape.Detach();
			brushape.CreateSolidBrush(RGB(0,255,0));
			nflag++;
			OnKeyUp(m_chshape, 1, 0);
			break;
		case 3:
			brushape.Detach();
			brushape.CreateSolidBrush(RGB(0,0,255));
			nflag++;
			OnKeyUp(m_chshape, 1, 0);
			break;
		case 4:
			brushape.Detach();
			brushape.CreateStockObject(NULL_BRUSH);
			OnKeyUp(m_chshape, 1, 0);
			nflag=0;
			break;
		}
	}
	
	TRACE("\n%d\n",point.x);
	TRACE("%d",point.y);	
	CDialog::OnLButtonUp(nFlags, point);
}

bool CMessage2Dlg::Pinside(CPoint point)
{
	CRgn rgn;
	if (m_chshape=='e')
		rgn.CreateEllipticRgnIndirect(&shape);
	else if (m_chshape=='r')
		rgn.CreateRectRgnIndirect(&shape);

	if (rgn.PtInRegion(point))
		return TRUE;
	else 
		return FALSE;

}
RECT CMessage2Dlg::Rfromp(CPoint point)
{
    RECT shape;
	shape.bottom=point.y+40;
	shape.top=point.y-40;
	shape.left=point.x-40;
	shape.right=point.x+40;
	return shape;
}


void CMessage2Dlg::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if ((nFlags & MK_LBUTTON))
	{

	if (Pinside(point))
		{
			Invalidate();
			m_bmove=TRUE;
			CPoint chpoint;
			chpoint.x=point.x-m_nx;
			chpoint.y=point.y-m_ny;
			shape=Rfromp(chpoint);
		}
	}
	CDialog::OnMouseMove(nFlags, point);
}