myball.cpp

一个小球乱跑的小游戏

// MyBall.cpp : implementation file
//

#include "stdafx.h"
#include "playBall.h"
#include "MyBall.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMyBall

CMyBall::CMyBall()
{
}

CMyBall::CMyBall(CWnd *pParent, UINT id)
{
	m_id = id;
	dx = dy = 5;
	x = y = 0;

	m_pParent = pParent;
}

CMyBall::~CMyBall()
{
}

BEGIN_MESSAGE_MAP(CMyBall, CWnd)
	//{{AFX_MSG_MAP(CMyBall)
	ON_WM_CREATE()
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


int CMyBall::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CWnd::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	CRgn rgn;
	rgn.CreateEllipticRgnIndirect(CRect(0, 0, m_rect.Width(), m_rect.Height()));
	SetWindowRgn((HRGN)rgn, TRUE);

	SetTimer(99, 100 / m_nSpeed, NULL);

	srand(rand());
	dx = rand() % 9 + 1;
	dy = rand() % 9 + 1;
	
	return 0;
}

void CMyBall::OnTimer(UINT nIDEvent)
{
	CRect rectParent;
	m_pParent->GetClientRect(&rectParent);

	if(m_rect.left < rectParent.left ||
		m_rect.right > rectParent.right)
		dx = -dx;
	if(m_rect.top < rectParent.top ||
		m_rect.bottom > rectParent.bottom)
		dy = -dy;
	
	m_rect.OffsetRect(dx, dy);
	
	MoveWindow(&m_rect);

	RedrawWindow();
	CWnd::OnTimer(nIDEvent);
}