www.pudn.com > VC_ImageProcessing.rar > DlgHistShow1.cpp, change:2000-01-01,size:4423b


// DlgHistShow1.cpp : implementation file 
// 
 
#include "stdafx.h" 
#include "ImageProcessing.h" 
#include "DlgHistShow1.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CDlgHistShow dialog 
 
 
CDlgHistShow::CDlgHistShow(CWnd* pParent /*=NULL*/) 
	: CDialog(CDlgHistShow::IDD, pParent) 
{ 
	//{{AFX_DATA_INIT(CDlgHistShow) 
		// NOTE: the ClassWizard will add member initialization here 
	//}}AFX_DATA_INIT 
} 
 
 
void CDlgHistShow::DoDataExchange(CDataExchange* pDX) 
{ 
	CDialog::DoDataExchange(pDX); 
	//{{AFX_DATA_MAP(CDlgHistShow) 
		// NOTE: the ClassWizard will add DDX and DDV calls here 
	//}}AFX_DATA_MAP 
} 
 
 
BEGIN_MESSAGE_MAP(CDlgHistShow, CDialog) 
	//{{AFX_MSG_MAP(CDlgHistShow) 
	ON_WM_PAINT() 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CDlgHistShow message handlers 
 
BOOL CDlgHistShow::OnInitDialog()  
{ 
	CDialog::OnInitDialog(); 
	 
	// TODO: Add extra initialization here 
	 
	// 设置直线原图象象素的指针 
	unsigned char * lpSrc; 
 
	// 循环变量 
	int i,j; 
 
	// 获取绘制直方图的标签 
	CWnd* pWnd = GetDlgItem(IDC_DLG_HIST_SHOW); 
 
	// 计算得到直方图 
	// 图象的高度和宽度 
	CSize sizeImage; 
	sizeImage = m_pDib->GetDimensions(); 
 
 
	// 获得图象数据存储的高度和宽度 
	CSize sizeSaveImage; 
	sizeSaveImage = m_pDib->GetDibSaveDim(); 
 
	// 重置计数为0 
	for (i = 0; i < 256; i ++) 
	{ 
		// 清零 
		m_nHist[i] = 0; 
	} 
	 
	// 计算各个灰度值的计数,即得到直方图 
	for (i = 0; i < sizeImage.cy; i ++) 
	{ 
		for (j = 0; j < sizeImage.cx; j ++) 
		{ 
			lpSrc = (unsigned char *)m_pDib->m_lpImage + sizeSaveImage.cx * i + j; 
			 
			// 计数加1 
			m_nHist[*(lpSrc)]++; 
		} 
	} 
 
	return TRUE;  // return TRUE unless you set the focus to a control 
	              // EXCEPTION: OCX Property Pages should return FALSE 
} 
 
void CDlgHistShow::OnPaint()  
{ 
	CPaintDC dc(this); // device context for painting 
	 
	// TODO: Add your message handler code here 
 
 
	// 循环变量 
	int i; 
	// 获取绘制直方图文本框的标签 
	CWnd* pWnd = GetDlgItem(IDC_DLG_HIST_SHOW); 
 
	// 获取设备上下文 
	CDC* pDC = pWnd->GetDC(); 
	pWnd->Invalidate(); 
	pWnd->UpdateWindow(); 
 
	pDC->Rectangle(0, 0, 330, 300); 
 
	// 创建画笔对象 
	CPen* pPenRed = new CPen; 
 
	// 创建红色画笔(用于绘制坐标轴) 
	pPenRed->CreatePen(PS_SOLID, 1, RGB(255,0,0)); 
 
	// 选入红色画笔,并保存以前的画笔 
	CPen* pOldPen = pDC->SelectObject(pPenRed); 
 
	// 绘制坐标轴 
	pDC->MoveTo(10,10); 
	 
	// 绘制垂直轴 
	pDC->LineTo(10, 280); 
 
	// 绘制水平轴 
	pDC->LineTo(320, 280); 
 
	// 绘制X轴刻度值 
	CString strTemp; 
	strTemp.Format("0"); 
	pDC->TextOut(10, 283, strTemp); 
	strTemp.Format("50"); 
	pDC->TextOut(60, 283, strTemp); 
	strTemp.Format("100"); 
	pDC->TextOut(110, 283, strTemp); 
	strTemp.Format("150"); 
	pDC->TextOut(160, 283, strTemp); 
	strTemp.Format("200"); 
	pDC->TextOut(210, 283, strTemp); 
	strTemp.Format("255"); 
	pDC->TextOut(265, 283, strTemp); 
	 
	// 绘制X轴刻度 
	for (i = 0; i < 256; i += 5) 
	{ 
		if ((i & 1) == 0) 
		{ 
			// 10的倍数 
			pDC->MoveTo(i + 10, 280); 
			pDC->LineTo(i + 10, 284); 
		} 
		else 
		{ 
			// 5的奇数倍数 
			pDC->MoveTo(i + 10, 280); 
			pDC->LineTo(i + 10, 282); 
		} 
	} 
	 
	// 绘制X轴箭头 
	pDC->MoveTo(315,275); 
	pDC->LineTo(320,280); 
	pDC->LineTo(315,285); 
	 
	// 绘制Y轴箭头 
	pDC->MoveTo(10,10); 
	pDC->LineTo(5,15); 
	pDC->MoveTo(10,10); 
	pDC->LineTo(15,15); 
 
	// 直方图中最大计数值 
	LONG lMaxCount = 0; 
 
	// 计算最大计数值 
	for (i = 0; i <= 255; i ++) 
	{ 
		// 判断是否大于当前最大值 
		if (m_nHist[i] > lMaxCount) 
		{ 
			// 更新最大值 
			lMaxCount = m_nHist[i]; 
		} 
	} 
	 
	// 输出最大计数值 
	pDC->MoveTo(10, 25); 
	pDC->LineTo(14, 25); 
	strTemp.Format("%d", lMaxCount); 
	pDC->TextOut(11, 26, strTemp); 
	 
	// 声名画笔对象 
	CPen* pPenBlue = new CPen; 
 
	// 创建蓝色画笔(用于绘制直方图) 
	pPenBlue->CreatePen(PS_SOLID, 1, RGB(0,0,255)); 
 
	// 选入蓝色画笔 
	pDC->SelectObject(pPenBlue); 
 
	// 判断是否存在计数值 
	if(lMaxCount > 0){ 
		// 绘制直方图 
		for (i = 0; i <= 255; i ++) 
		{ 
			pDC->MoveTo(i + 10, 280); 
			pDC->LineTo(i + 10, 281 - (int) (m_nHist[i] * 256 / lMaxCount)); 
		} 
	} 
 
	// 恢复以前的画笔 
	pDC->SelectObject(pOldPen);	 
	 
	// 删除新的画笔 
	delete pPenRed; 
	delete pPenBlue; 
}