// PointWinDlg.cpp : implementation file
//

#include "stdafx.h"
#include "LineTrans.h"
#include "PointWinDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CPointWinDlg dialog


CPointWinDlg::CPointWinDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CPointWinDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CPointWinDlg)
	m_bLow = 0;
	m_bUp = 0;
	//}}AFX_DATA_INIT
}


void CPointWinDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CPointWinDlg)
	DDX_Text(pDX, IDC_EDIT_LOW, m_bLow);
	DDV_MinMaxByte(pDX, m_bLow, 0, 255);
	DDX_Text(pDX, IDC_EDIT_UP, m_bUp);
	DDV_MinMaxByte(pDX, m_bUp, 0, 255);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CPointWinDlg, CDialog)
	//{{AFX_MSG_MAP(CPointWinDlg)
	ON_EN_KILLFOCUS(IDC_EDIT_LOW, OnKillfocusEDITLow)
	ON_EN_KILLFOCUS(IDC_EDIT_UP, OnKillfocusEDITUp)
	ON_WM_PAINT()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPointWinDlg message handlers

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

	CWnd* pWnd = GetDlgItem(IDC_COORD);
	pWnd->GetClientRect(m_MouseRect);
	pWnd->ClientToScreen(&m_MouseRect);
	
	CRect rect;
	GetClientRect(rect);
	ClientToScreen(&rect);	
	m_MouseRect.top -= rect.top;
	m_MouseRect.left -= rect.left;
	
	// 設置接受鼠標事件的有效區域
	m_MouseRect.top += 25;
	m_MouseRect.left += 10;
	m_MouseRect.bottom = m_MouseRect.top + 255;
	m_MouseRect.right = m_MouseRect.left + 256;
	
	m_iIsDraging = 0;

	return TRUE;
}

void CPointWinDlg::OnKillfocusEDITLow() 
{
	UpdateData(TRUE);
	
	// 判斷是否下限超過上限
	if (m_bLow > m_bUp)
	{
		BYTE bTemp = m_bLow;
		m_bLow = m_bUp;
		m_bUp = bTemp;

		UpdateData(FALSE);
	}

	InvalidateRect(m_MouseRect, TRUE);
}

void CPointWinDlg::OnKillfocusEDITUp() 
{
	UpdateData(TRUE);
	
	// 判斷是否下限超過上限
	if (m_bLow > m_bUp)
	{
		BYTE bTemp = m_bLow;
		m_bLow = m_bUp;
		m_bUp = bTemp;
		
		UpdateData(FALSE);
	}

	InvalidateRect(m_MouseRect, TRUE);
}

void CPointWinDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// 當用戶單擊鼠標左鍵開始拖動
	if(m_MouseRect.PtInRect(point))
	{
		if (point.x == (m_MouseRect.left + m_bLow))
		{		
			// 設置拖動狀態1，拖動下限
			m_iIsDraging = 1;
			::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
		}
		else if (point.x == (m_MouseRect.left + m_bUp))
		{			
			// 設置拖動狀態為2，拖動上限
			m_iIsDraging = 2;
			::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
		}
	}

	CDialog::OnLButtonDown(nFlags, point);
}

void CPointWinDlg::OnMouseMove(UINT nFlags, CPoint point) 
{
	// 判斷當前光標是否在繪制區域
	if(m_MouseRect.PtInRect(point))
	{
		// 判斷是否正在拖動
		if (m_iIsDraging != 0)
		{
			// 判斷正在拖動上限還是下限
			if (m_iIsDraging == 1)
			{
				// 判斷是否下限<上限
				if (point.x - m_MouseRect.left < m_bUp)
				{
					// 更改下限
					m_bLow = (BYTE) (point.x - m_MouseRect.left);
				}
				else
				{
					// 下限拖過上限，設置為上限-1
					m_bLow = m_bUp - 1;					
					// 重設鼠標位置
					point.x = m_MouseRect.left + m_bUp - 1;
				}
			}
			else
			{				
				// 判斷是否上限>下限
				if (point.x - m_MouseRect.left > m_bLow)
				{
					// 更改下限
					m_bUp = (BYTE) (point.x - m_MouseRect.left);
				}
				else
				{
					// 下限拖過上限，設置為下限＋1
					m_bUp = m_bLow + 1;					
					// 重設鼠標位置
					point.x = m_MouseRect.left + m_bLow + 1;
				}
			}
			
			::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
			UpdateData(FALSE);
			InvalidateRect(m_MouseRect, TRUE);
		}
		else if (point.x == (m_MouseRect.left + m_bLow) || point.x == 
			(m_MouseRect.left + m_bUp))
		{
			::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
		}
	}

	CDialog::OnMouseMove(nFlags, point);
}

void CPointWinDlg::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// 當用戶釋放鼠標左鍵停止拖動
	if (m_iIsDraging != 0)
	{
		m_iIsDraging = 0;
	}

	CDialog::OnLButtonUp(nFlags, point);
}

void CPointWinDlg::OnPaint() 
{
	CString str;

	CPaintDC dc(this);
	
	CWnd* pWnd = GetDlgItem(IDC_COORD);
	CDC* pDC = pWnd->GetDC();
	pWnd->Invalidate();
	pWnd->UpdateWindow();	
	pDC->Rectangle(0,0,330,300);
	
	CPen* pPenRed = new CPen;		
	pPenRed->CreatePen(PS_SOLID,2,RGB(255,0,0));
	CPen* pPenBlue = new CPen;
	pPenBlue->CreatePen(PS_SOLID,2,RGB(0,0, 255));
	CPen* pPenGreen = new CPen;
	pPenGreen->CreatePen(PS_DOT,1,RGB(0,255,0));
	
	// 選中當前紅色畫筆，并保存以前的畫筆
	CGdiObject* pOldPen = pDC->SelectObject(pPenRed);
		
	pDC->MoveTo(10,10);			// 繪制坐標軸	
	pDC->LineTo(10,280);		// 垂直軸	
	pDC->LineTo(320,280);		// 水平軸
		
	str.Format("0");
	pDC->TextOut(10, 281, str);	// 寫坐標	
	str.Format("255");
	pDC->TextOut(265, 281, str);
	pDC->TextOut(11, 25, str);
	
	// 繪制X軸箭頭
	pDC->LineTo(315,275);
	pDC->MoveTo(320,280);
	pDC->LineTo(315,285);
	
	// 繪制X軸箭頭
	pDC->MoveTo(10,10);
	pDC->LineTo(5,15);
	pDC->MoveTo(10,10);
	pDC->LineTo(15,15);
	
	// 更改成綠色畫筆
	pDC->SelectObject(pPenGreen);	
	
	// 繪制窗口上下限
	pDC->MoveTo(m_bLow + 10, 25);
	pDC->LineTo(m_bLow + 10, 280);
	
	pDC->MoveTo(m_bUp + 10, 25);
	pDC->LineTo(m_bUp + 10, 280);
	
	// 更改成藍色畫筆
	pDC->SelectObject(pPenBlue);	
	
	// 繪制坐標值
	str.Format("(%d, %d)", m_bLow, m_bLow);
	pDC->TextOut(m_bLow + 10, 281 - m_bLow, str);
	str.Format("(%d, %d)", m_bUp, m_bUp);
	pDC->TextOut(m_bUp + 10, 281 - m_bUp, str);
	
	// 繪制用戶指定的窗口（注意轉換坐標系）
	pDC->MoveTo(10, 280);
	pDC->LineTo(m_bLow + 10, 280);
	pDC->LineTo(m_bLow + 10, 280 - m_bLow);
	pDC->LineTo(m_bUp + 10, 280 - m_bUp);
	pDC->LineTo(m_bUp + 10, 25);
	pDC->LineTo(265, 25);
	
	// 恢復以前的畫筆
	pDC->SelectObject(pOldPen);	
	
	// 繪制邊緣
	pDC->MoveTo(10,25);
	pDC->LineTo(265,25);
	pDC->LineTo(265,280);
	
	delete pPenRed;
	delete pPenBlue;
	delete pPenGreen;	
}

void CPointWinDlg::OnOK() 
{	
	// 判斷是否下限超過上限
	if (m_bLow > m_bUp)
	{
		BYTE bTemp = m_bLow;
		m_bLow = m_bUp;
		m_bUp = bTemp;
	}

	CDialog::OnOK();
}