// 裁剪Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "裁剪.h"
#include "裁剪Dlg.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()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg dialog

CMyDlg::CMyDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMyDlg)
		// 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);
	ldb = FALSE;
	step = 0;
	top = 20,but = 100,lef = 20,rig = 100;
	lxb = 0,lyb = 0;
	lxe = 50,lye = 50;
}

void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMyDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
	//{{AFX_MSG_MAP(CMyDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON4, OnButton4)
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg message handlers

BOOL CMyDlg::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
	CPaintDC dc(this);
	pic.CreateCompatibleDC(&dc);
	CBitmap * bp1,*obp1;
	bp1 = new CBitmap;
	bp1->LoadBitmap(IDB_B);
	obp1 = pic.SelectObject(bp1);
	obp1->DeleteObject();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CMyDlg::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 CMyDlg::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	if (IsIconic())
	{
		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();
	}
	CDC mdc;
	CBitmap bmp,*bp;
	bmp.LoadBitmap(IDB_B);
	mdc.CreateCompatibleDC(GetDC());
	bp = mdc.SelectObject(&bmp);
	pic.BitBlt(0,0,500,320,&mdc,0,0,SRCCOPY);
	mdc.SelectObject(bp);

	CDC * dc1;
	CWnd * wd1;
	wd1 = this->GetDlgItem(IDC_S);
	dc1 = wd1->GetDC();
	pic.MoveTo(lxb,lyb);
	pic.LineTo(lxe,lye);
	pic.MoveTo(lef,top);
	pic.LineTo(rig,top);
	pic.LineTo(rig,but);
	pic.LineTo(lef,but);
	pic.LineTo(lef,top);
	dc1->BitBlt(1,1,496,309,&pic,0,0,SRCCOPY);
}

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

void CMyDlg::OnButton4() 
{
	// TODO: Add your control notification handler code here
	OnOK();
}

void CMyDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	step = 1;
}

void CMyDlg::OnButton2() 
{
	// TODO: Add your control notification handler code here
	step = 2;
}

void CMyDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(step){
		if(point.x>11&&point.x<508&&point.y>11&&point.y<321){
			ldb = TRUE;
			switch(step){
			case 1:
				top = point.y-12;
				lef = point.x-12;
				break;
			case 2:
				lxb = point.x-12;
				lyb = point.y-12;
				break;
			}
		}
	}	
	CDialog::OnLButtonDown(nFlags, point);
}

void CMyDlg::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(ldb){
		ldb = FALSE;
		int ti;
		switch(step){
		case 1:
			but = point.y-12;
			rig = point.x-12;
			if(but<top){ti = but;but = top;top = ti;}
			if(lef>rig){ti = lef;lef = rig;rig = ti;}
			break;
		case 2:
			lxe = point.x-12;
			lye = point.y-12;
			break;
		}
		Invalidate(FALSE);
	}
	CDialog::OnLButtonUp(nFlags, point);
}

void CMyDlg::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(ldb){
		switch(step){
		case 1:
			but = point.y-12;
			rig = point.x-12;
			break;
		case 2:
			lxe = point.x-12;
			lye = point.y-12;
			break;
		}
		Invalidate(FALSE);
	}
	CDialog::OnMouseMove(nFlags, point);
}

#define LEFT 1
#define RIGHT 2
#define BOTTOM 4
#define TOP 8
int CMyDlg::code(int x,int y){//編碼函數(shù)
	int c = 0;
	if(x<lef)
		c = c|LEFT;
	else if(x>rig)
		c = c|RIGHT;
	if(y>but)
		c = c|BOTTOM;
	else if(y<top)
		c = c|TOP;
	return c;
}

void CMyDlg::OnButton3() 
{
	// TODO: Add your control notification handler code here
	int code1,code2,tcode;
	code1 = code(lxb,lyb);
	code2 = code(lxe,lye);
	int x,y;
	while(code1!=0||code2!=0){
		if((code1&code2)!=0){
			lxb = 0,lyb = 0;
			lxe = 0,lye = 0;
			break;
		}
		tcode = code1;
		if(code1 == 0){
			tcode = code2;
		}
//		float tt = 0.5f;
		if((tcode&LEFT)!=0){//交左邊界
			x = lef;
			y = lyb + (int)(float(lye - lyb)*float(lef-lxb)/float(lxe - lxb));
		}
		else if((tcode&RIGHT)!=0){//右邊界相交
			x = rig;
			y = lyb + int(float(lye - lyb)*float(rig - lxb)/float(lxe - lxb));
		}
		else if((tcode&BOTTOM) != 0){//與下邊界相交
			y = but;
			x = lxb + int(float(lxe - lxb) * float(but - lyb)/float(lye - lyb));
		}
		else if((tcode&TOP)!=0){//與上邊界相交
			y = top;
			x = lxb + int(float(lxe - lxb) * float(top - lyb)/float(lye - lyb));
		}

		if(tcode == code1){
			lxb = x;
			lyb = y;
			code1 = code(x,y);
		}
		else{
			lxe = x;
			lye = y;
			code2 = code(x,y);
		}
	}
//	step = 0;
	Invalidate(FALSE);
}