// HistogramDlg.cpp : 實現文件
//

#include "stdafx.h"
#include "photoshow.h"
#include "HistogramDlg.h"
#include "MainFrm.h"
#include "photoshowDoc.h"
#include "photoshowView.h"


// CHistogramDlg 對話框

IMPLEMENT_DYNAMIC(CHistogramDlg, CDialog)

CHistogramDlg::CHistogramDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CHistogramDlg::IDD, pParent)
	, m_nLimitLow(0)
	, m_nLimitUp(255)
	, m_nGray(0)
	, m_dPer(0)
{
	memset(m_lCounts, 0, sizeof(long) * 256);
	m_nIsDraging = DT_NULL;
}

CHistogramDlg::~CHistogramDlg()
{
}

void CHistogramDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_HISTOGRAM, m_stiHistogram);
	DDX_Text(pDX, IDC_LIMIT_LOWER, m_nLimitLow);
	DDX_Text(pDX, IDC_LIMIT_UP, m_nLimitUp);
	DDX_Text(pDX, IDC_STATIC_GRAY, m_nGray);
	DDX_Text(pDX, IDC_STATIC_PER, m_dPer);
}


BEGIN_MESSAGE_MAP(CHistogramDlg, CDialog)
	ON_EN_CHANGE(IDC_LIMIT_LOWER, &CHistogramDlg::OnEnChangeLimitLower)
	ON_EN_CHANGE(IDC_LIMIT_UP, &CHistogramDlg::OnEnChangeLimitUp)
	ON_WM_PAINT()
	ON_WM_MOUSEMOVE()
	ON_WM_SETCURSOR()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_BN_CLICKED(IDCANCEL, &CHistogramDlg::OnBnClickedCancel)
END_MESSAGE_MAP()


// CHistogramDlg 消息處理程序

void CHistogramDlg::OnEnChangeLimitLower()
{
    UpdateData(TRUE);

	// 限定取值范圍
	if (m_nLimitLow < 0)
		m_nLimitLow = 0;
	else if (m_nLimitLow > 255)
		m_nLimitLow = 255;

	// 如果下限比上限大，則互換
	if (m_nLimitLow > m_nLimitUp)
	{
		int nTemp = m_nLimitLow;
		m_nLimitLow = m_nLimitUp;
		m_nLimitUp = nTemp;
	}

	Refresh();
	UpdateData(FALSE);
}

void CHistogramDlg::OnEnChangeLimitUp()
{
	UpdateData(TRUE);

	// 限定取值范圍
	if (m_nLimitUp < 0)
		m_nLimitUp = 0;
	else if (m_nLimitUp > 255)
		m_nLimitUp = 255;

	if (m_nLimitLow > m_nLimitUp)
	{
		int nTemp = m_nLimitLow;
		m_nLimitLow = m_nLimitUp;
		m_nLimitUp = nTemp;
	}

	Refresh();
	UpdateData(FALSE);
}

void CHistogramDlg::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	Refresh();
}

void CHistogramDlg::OnMouseMove(UINT nFlags, CPoint point)
{
	CRect rect;
	m_stiHistogram.GetWindowRect(rect);
	if((nFlags&MK_LBUTTON)&&m_nIsDraging){
		int offset=point.x-m_psMove.x;
		if(m_nIsDraging==DT_UP){
			if((offset+m_nLimitUp)<=255){
				if((offset+m_nLimitUp)>=m_nLimitLow)
					m_nLimitUp+=offset;
				else
					m_nLimitUp=m_nLimitLow;
			}
			else
				m_nLimitUp=255;
		}
		else{
			if((offset+m_nLimitLow)>=0){
				if((offset+m_nLimitLow)<=m_nLimitUp)
					m_nLimitLow+=offset;
				else
					m_nLimitLow=m_nLimitUp;
			}
			else
				m_nLimitLow=0;
		}
		UpdateData(FALSE);
		Refresh();
		m_psMove=point;
	}
	else
		m_nIsDraging=DT_NULL;
	ClientToScreen(&point);
	int x=point.x-rect.left-10;
	if(abs(x-m_nLimitUp)>3&&abs(x-m_nLimitLow)>3)
		m_nIsDraging=DT_NULL;
	if(rect.PtInRect(point)){
		if(x>m_nLimitLow && x<=m_nLimitUp){
			m_nGray=x;
			m_dPer=float(m_lCounts[x])/m_nPixelCount*100;
		}
		UpdateData(FALSE);
	}
}

BOOL CHistogramDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
	CRect rect;
	CPoint point;

	GetCursorPos(&point);
	m_stiHistogram.GetWindowRect(rect);
	if (rect.PtInRect(point))
	{
		int x = point.x - rect.left - 10;

		if (abs(x - m_nLimitUp) <= 3 || abs(x - m_nLimitLow) <= 3)
		{
			SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
			return TRUE;
		}
	}

	return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

void CHistogramDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
    CRect rect;
	CPoint oldPoint=point;
	m_stiHistogram.GetWindowRect(rect);
	ClientToScreen(&point);
	int x=point.x-rect.left-10;
	if(abs(x-m_nLimitUp)<=3){
		m_psMove=oldPoint;
		m_nIsDraging=DT_UP;
	}
	else if(abs(x-m_nLimitLow)<=3){
		m_psMove=oldPoint;
		m_nIsDraging=DT_LOW;
	}
}

void CHistogramDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
	m_nIsDraging=DT_NULL;
}

BOOL CHistogramDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	CMainFrame* pMain=(CMainFrame*)AfxGetMainWnd();
	CphotoshowView* pView=(CphotoshowView*)pMain->GetActiveView();
	for(UINT i=0;i<pView->m_nPicWidth*pView->m_nPicHeight;i++){
		int value=pView->m_pImageTempBuffer[i*4];
        m_lCounts[value]++;
	}
	m_nPixelCount=pView->m_nPicWidth*pView->m_nPicHeight;
	return TRUE;
}

void CHistogramDlg::Refresh(void)
{
	CDC* pDC=m_stiHistogram.GetDC();
	CRect rect;
	CDC memDC;
	CBitmap MemBitmap;
	m_stiHistogram.GetClientRect(rect);
	memDC.CreateCompatibleDC(NULL);
	MemBitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());
	memDC.SelectObject(MemBitmap);
	memDC.FillSolidRect(0,0,rect.Width(),rect.Height(),RGB(255,255,255));
	Graphics graph(memDC.GetSafeHdc());
	graph.FillRectangles(&SolidBrush(Color::White),
		&Rect(0,0,rect.Width(),rect.Height()),
		1);
	graph.DrawLine(&Pen(Color::Black),10,10,10,280);
	graph.DrawLine(&Pen(Color::Black),10,10,5,15);
	graph.DrawLine(&Pen(Color::Black),10,10,15,15);
	graph.DrawLine(&Pen(Color::Black),10,280,290,280);
	graph.DrawLine(&Pen(Color::Black),290,280,285,285);
	graph.DrawLine(&Pen(Color::Black),290,280,285,275);
	CString strNum;
	Font font(L"宋體",10);
	strNum=L"0";
	graph.DrawString(strNum,-1,&font,
		PointF(8,290),&SolidBrush(Color::Black));
	for(int i=0;i<256;i+=5){
		if(i%50==0)
			graph.DrawLine(&Pen(Color::Black),10+i,280,10+i,286);
		else if(i%10==0)
			graph.DrawLine(&Pen(Color::Black),10+i,280,10+i,283);
	}
	strNum=L"50";
	graph.DrawString(strNum,-1,&font,
		             PointF(53,290),&SolidBrush(Color::Black));
	strNum=L"100";
	graph.DrawString(strNum,-1,&font,
		             PointF(100,290),&SolidBrush(Color::Black));
	strNum=L"150";
	graph.DrawString(strNum,-1,&font,
		             PointF(150,290),&SolidBrush(Color::Black));
	strNum=L"200";
	graph.DrawString(strNum,-1,&font,
		             PointF(200,290),&SolidBrush(Color::Black));
	Pen pen(Color::Blue);
	pen.SetDashStyle(DashStyleDash);
	graph.DrawLine(&pen,10+m_nLimitLow,280,10+m_nLimitLow,10);
	graph.DrawLine(&pen,10+m_nLimitUp,280,10+m_nLimitUp,10);
	long lMax=0;
	REAL dHeight=0.0;
    for(int i=m_nLimitLow;i<=m_nLimitUp;i++)
		lMax=max(lMax,m_lCounts[i]);
	strNum.Format(L"%d",lMax);
	graph.DrawString(strNum,-1,&font,
		             PointF(10,25),&SolidBrush(Color::Black));
	for (int i=m_nLimitLow;i<= m_nLimitUp;i++){
		dHeight=(REAL)(m_lCounts[i])/lMax*250;
		graph.DrawLine(&Pen(Color::Gray),i+10.0f,280.0f,i+10.0f,280-dHeight);
	}
	pDC->BitBlt(0,0,rect.Width(),rect.Height(),&memDC,0,0,SRCCOPY);
	m_stiHistogram.ReleaseDC(pDC);
}

void CHistogramDlg::OnBnClickedCancel()
{
	// TODO: 在此添加控件通知處理程序代碼
	OnCancel();
}