childview.cpp

这是MFC Windows程序设计（第2版）

// ChildView.cpp : implementation of the CChildView class
//

#include "stdafx.h"
#include "GridDemo.h"
#include "ChildView.h"
#include "SettingsDialog.h"

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

/////////////////////////////////////////////////////////////////////////////
// CChildView

CChildView::CChildView()
{
	m_cx = 8;
	m_cy = 8;
	m_nWeight = 4;
}

CChildView::~CChildView()
{
}

BEGIN_MESSAGE_MAP(CChildView,CWnd )
	//{{AFX_MSG_MAP(CChildView)
	ON_WM_PAINT()
	ON_COMMAND(ID_OPTIONS_GRID_SETTINGS, OnOptionsGridSettings)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChildView message handlers

BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs) 
{
	if (!CWnd::PreCreateWindow(cs))
		return FALSE;

	cs.dwExStyle |= WS_EX_CLIENTEDGE;
	cs.style &= ~WS_BORDER;
	cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS, 
		::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1), NULL);

	return TRUE;
}

void CChildView::OnPaint() 
{
    CRect rect;
    GetClientRect (&rect);

    int nShade = m_nWeight * 32;
    if (nShade != 0)
        nShade--;

    CPaintDC dc (this);
    CPen pen (PS_SOLID, 1, RGB (nShade, nShade, nShade));
    CPen* pOldPen = dc.SelectObject (&pen);

    int x;
    for (int i=1; i<m_cx; i++) {
        x = (rect.Width () * i) / m_cx;
        dc.MoveTo (x, 0);
        dc.LineTo (x, rect.Height ());
    }

    int y;
    for (i=1; i<m_cy; i++) {
        y = (rect.Height () * i) / m_cy;
        dc.MoveTo (0, y);
        dc.LineTo (rect.Width (), y);
    }

    dc.SelectObject (pOldPen);
}

void CChildView::OnOptionsGridSettings() 
{
    CSettingsDialog dlg;

    dlg.m_cx = m_cx;
    dlg.m_cy = m_cy;
    dlg.m_nWeight = m_nWeight;

    if (dlg.DoModal () == IDOK) {
        m_cx = dlg.m_cx;
        m_cy = dlg.m_cy;
        m_nWeight = dlg.m_nWeight;
        Invalidate ();
    }
}