starfielddlg.cpp

这是个简单的屏幕保护程序有些地方还需大吓门改进一下不过还是可以借鉴的

// StarFieldDlg.cpp : implementation file
//

#include "stdafx.h"
#include "StarField.h"
#include "StarFieldDlg.h"

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

#define WHITE RGB(255,255,255)
#define BLACK RGB(0,0,0)

int width, height;


CStarFieldDlg::CStarFieldDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CStarFieldDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CStarFieldDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CStarFieldDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CStarFieldDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CStarFieldDlg, CDialog)
	//{{AFX_MSG_MAP(CStarFieldDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_TIMER()
	ON_WM_LBUTTONDOWN()
	ON_WM_SIZE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CStarFieldDlg message handlers

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

	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	width = GetSystemMetrics(SM_CXSCREEN);
	height = GetSystemMetrics(SM_CYSCREEN);

	for (int i=1; i<=StarCount; i++)
	{
		Star[i].speed = rand()%10+1;
		Star[i].x = rand()%width;
		Star[i].y = rand()%height;
	}

	MoveWindow(0,0,width,height);

	SetTimer(IDT_TIMER,60,NULL);
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CStarFieldDlg::OnPaint() 
{


	CPaintDC dc(this);
	Cls(&dc);

	if (IsIconic())
	{
		 // device context for painting
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

void CStarFieldDlg::Point(CDC* dc,int x, int y, int Size) 
{
	CPen lPen(PS_SOLID, Size, WHITE);
	dc->SelectObject(&lPen);
	dc->MoveTo(x,y);
	dc->LineTo(x,y);
}

void CStarFieldDlg::Cls(CDC *dc) 
{
	CBrush lSolidBrush(BLACK);
	dc->SelectObject(&lSolidBrush);
	dc->Rectangle(0,0,width,height);
}

void CStarFieldDlg::OnTimer(UINT nIDEvent) 
{
	CClientDC dc(this);
	Cls(&dc);
	
	for (int i=1; i<=StarCount; i++)
	{
		Star[i].y += Star[i].speed;
		if (Star[i].y > height)
		{
			Star[i].x = rand() % width;
			Star[i].y = -Star[i].speed;
			Star[i].speed = rand()%10+1;
		}
		Point(&dc,Star[i].x,Star[i].y,int(Star[i].speed/4)+1);
	}

	CDialog::OnTimer(nIDEvent);
}

HCURSOR CStarFieldDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CStarFieldDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	OnOK();
	CDialog::OnLButtonDown(nFlags, point);
}