1、 点击ResourceView,右键点击Dialog,选Insert Dialog 在属性对话框中将ID改为ID_HIST,对话框名称改为“直方图”
2、 在工具栏中点“插入”-“新建类”,输入类名,并选Base Class为CDialog,Dialog ID为ID_HIST。这样就将对话框和类联系起来了,在该对话框中拖入一Edit控件,将其ID设为IDC_HISTSHOW;
3、 快捷键“Ctrl+W”,出现MFC ClassWizard对话框,在Messages栏中分别选WM_INITDIALOG和WM_Paint,再点击“Add Function”,即将对话框初始化和画图函数加入对话框类之中。
4、 在Hist.h文件“public:”下面输入如下变量定义:
LONG m_lCount[256];
char* m_lpDIBBits;
LONG m_lWidth;
LONG m_lHeight;
int m_iIsDraging;
CDlgIntensity(CWnd* pParent = NULL);
5、 打开Hist.cpp程序,在CHist::OnInitDialog()函数中“// TODO: Add extra initialization here”前将如下代码拷贝进去:
unsigned char* lpSrc;
LONG i;
LONG j;
6、 在“// TODO: Add extra initialization here”后将如下代码拷贝进去:
CWnd* pWnd=GetDlgItem(IDC_HISTSHOW); CRect rect; GetClientRect(rect); ClientToScreen(&rect); for(i=0;i<256;i++) { m_lCount[i]=0; } LONG lLineBytes; lLineBytes=WIDTHBYTES(m_lWidth*8); for(i=0;i<m_lHeight;i++) { for(j=0;j<m_lWidth;j++) { lpSrc=(unsigned char*)m_lpDIBBits+lLineBytes*i+j; m_lCount[*(lpSrc)]++; } } m_iIsDraging=0;
7、在CHist::OnPaint()函数“CPaintDC dc(this);”前将如下代码拷如其中:
CString str;
LONG i;
LONG lMaxCount=0;
LONG m_iLowGray=0;
LONG m_iUpGray=255;
在CHist::OnPaint()函数“// TODO: Add your message handler code here”后将如下代码拷如其中:
CWnd* pWnd=GetDlgItem(IDC_ HISTSHOW); CDC* pDC=pWnd->GetDC(); pWnd->Invalidate(); pWnd->UpdateWindow(); pDC->Rectangle(0,0,330,300); CPen* pPenRed=new CPen; pPenRed->CreatePen(PS_SOLID,1,RGB(255,0,0)); CPen* pPenBlue=new CPen; pPenBlue->CreatePen(PS_SOLID,1,RGB(0,0,255)); CPen* pPenGreen=new CPen; pPenGreen->CreatePen(PS_SOLID,1,RGB(0,255,0)); CGdiObject* pOldPen=pDC->SelectObject(pPenRed); pDC->MoveTo(10,10); pDC->LineTo(10,280); pDC->LineTo(320,280); str.Format("0"); pDC->TextOut(10,283,str); str.Format("50"); pDC->TextOut(60,283,str); str.Format("100"); pDC->TextOut(110,283,str); str.Format("150"); pDC->TextOut(160,283,str); str.Format("200"); pDC->TextOut(210,283,str); str.Format("255"); pDC->TextOut(265,283,str); for(i=0;i<256;i+=5) { if((i&1)==0) { pDC->MoveTo(i+10,280); pDC->LineTo(i+10,284); } else { pDC->MoveTo(i+10,280); pDC->LineTo(i+10,282); } } pDC->MoveTo(315,275); pDC->LineTo(320,280); pDC->LineTo(315,285); pDC->MoveTo(10,10); pDC->LineTo(5,15); pDC->MoveTo(10,10); pDC->LineTo(15,15); for(i=m_iLowGray;i<=m_iUpGray;i++) { if(m_lCount[i]>lMaxCount) { lMaxCount=m_lCount[i]; } } pDC->MoveTo(10,25); pDC->LineTo(14,25); str.Format("%d",lMaxCount); pDC->TextOut(11,26,str); pDC->SelectObject(pPenGreen); pDC->MoveTo(m_iLowGray+10,25); pDC->LineTo(m_iLowGray+10,280); pDC->MoveTo(m_iUpGray+10,25); pDC->LineTo(m_iUpGray+10,280); pDC->SelectObject(pPenBlue); if(lMaxCount>0) { for(i=m_iLowGray;i<=m_iUpGray;i++) { pDC->MoveTo(i+10,280); pDC->LineTo(i+10,281-(int)(m_lCount[i]*256/lMaxCount)); } } pDC->SelectObject(pOldPen); delete pPenRed; delete pPenBlue; delete pPenGreen;
8、点开ResourceView中的Menu,出现IDR_MAINFRAME和 IDR_MY111TYPE,双击IDR_MY111TYPE就出现了程序界面,有文件、编辑、查看、窗口、帮助按钮。点“查看”下面的虚线框右键——点“属性”,输入标题(直方图),和ID(大写英文,如ID_VIEW_HIST),这样就将按钮和程序通过ID联系起来了,点击该按钮,就会执行相应的程序。下面为该按钮添加函数:点Ctrl+W ,出现MFC ClassWizard对话框,选Class name为CMy111View,在Object IDs对应的选项中选中设置的ID(如为ID_VIEW_HIST),在Messages选项中选中COMMAND,然后点击“Add Function”按钮,选默认设置,就为ID_VIEW_HIST添加了相应的函数OnViewHist()。该函数在111View.cpp文件中定义,在函数void CMy111View:: OnViewHist()添加如下代码:
// TODO: Add your command handler code here CMy111Doc* pDoc=GetDocument(); if(pDoc->m_hDIB==NULL) { MessageBox("请先打开一幅256色的BMP图像!","系统提示",MB_ICONINFORMATION|MB_OK); return; } LPSTR lpDIB; LPSTR lpDIBBits; lpDIB=(LPSTR)::GlobalLock((HGLOBAL)pDoc->GetHDIB()); lpDIBBits=::FindDIBBits(lpDIB); if(::DIBNumColors(lpDIB)!=256) { MessageBox("目前只支持查看256色位图灰度直方图!","系统提示",MB_ICONINFORMATION|MB_OK); ::GlobalUnlock((HGLOBAL)pDoc->GetHDIB()); return; } BeginWaitCursor(); CHist dlgPara; dlgPara.m_lpDIBBits=lpDIBBits; dlgPara.m_lWidth=::DIBWidth(lpDIB); dlgPara.m_lHeight=::DIBHeight(lpDIB); // dlgPara.m_iLowGray=0; // dlgPara.m_iUpGray=255; if(dlgPara.DoModal()!=IDOK) { return; } ::GlobalUnlock((HGLOBAL)pDoc->GetHDIB()); EndWaitCursor();