canvasframe.cpp

《Visual C++游戏设计入门》的配套代码

// canvasFrame.cpp : implementation file
//
#define DIRECTINPUT_VERSION 0x0700
#include "stdafx.h"
#include "canvasr.h"
#include "canvasFrame.h"

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

/////////////////////////////////////////////////////////////////////////////
// canvasFrame

IMPLEMENT_DYNCREATE(canvasFrame, CFrameWnd)

LPDIRECTINPUT7  pDI;        //声明 DirectInput 对象指针
LPDIRECTINPUTDEVICE7  pDKB; //声明输入装置对象指针
HRESULT         result;     //声明 HRESULT 类型变量
char buffer[256];           //设定缓冲区
int x,y;                    //声明贴图坐标
canvasFrame::canvasFrame()
{
	Create(NULL,"绘图窗口");
	CClientDC dc(this);
	int width = dc.GetDeviceCaps(HORZRES);
	int height = dc.GetDeviceCaps(VERTRES);
	GetWindowRect( &rect );
	width = ( width - ( rect.right - rect.left ))/2 ;
	height = (height - (rect.bottom - rect.top ))/2 ;
	MoveWindow( width , height , (rect.right - rect.left ) , (rect.bottom - rect.top ) ,true);
	GetClientRect(&rect);
	mdc = new CDC;
	mdc->CreateCompatibleDC(&dc);
	ball = new CBitmap;
	ball->m_hObject = (HBITMAP)::LoadImage(NULL,"ball.bmp",IMAGE_BITMAP,81,81,LR_LOADFROMFILE); //载入图文件
	mdc->SelectObject(ball);
	x = ((rect.right-rect.left) - 81)/2;    //设定小球起点 X 坐标
	y = ((rect.bottom-rect.top) - 81)/2;    //设定小球起点 Y 坐标
}

canvasFrame::~canvasFrame()
{
	delete ball;
	delete mdc;
	pDKB->Release();
	pDI->Release();
}


BEGIN_MESSAGE_MAP(canvasFrame, CFrameWnd)
	//{{AFX_MSG_MAP(canvasFrame)
	ON_WM_CREATE()
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// canvasFrame message handlers

int canvasFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
		return -1;
	HINSTANCE hinst = AfxGetInstanceHandle();  //取得应用程序的 handle
	result = DirectInputCreateEx(hinst, DIRECTINPUT_VERSION, 
        IID_IDirectInput7, (void**)&pDI, NULL); //建立 DirectInput 对象
	if(result != DI_OK)
		MessageBox("建立 DirectInput 对象失败!");
	result = pDI->CreateDeviceEx(GUID_SysKeyboard, IID_IDirectInputDevice7,
        (void**)&pDKB, NULL); //建立输入装置对象
	if(result != DI_OK)
		MessageBox("建立键盘输入装置失败!");
	result = pDKB->SetDataFormat(&c_dfDIKeyboard);
	if(result != DI_OK)
		MessageBox("设定数据格式失败!");
	result = pDKB->SetCooperativeLevel(m_hWnd, 
                   DISCL_BACKGROUND | DISCL_NONEXCLUSIVE);  //设定协调层级
	if(result != DI_OK)
		MessageBox("设定程序协调层级失败!");
	result = pDKB->Acquire();   //取用输入装置
	if(result != DI_OK)
		MessageBox("取用输入装置失败!");
	SetTimer(1,0,NULL);
	// TODO: Add your specialized creation code here
	return 0;
}

void canvasFrame::OnTimer(UINT nIDEvent) 
{
	CFrameWnd::OnTimer(nIDEvent);
	CClientDC dc(this);                   
	dc.BitBlt(x,y,81,81,mdc,0,0,SRCCOPY); 
    result = pDKB->GetDeviceState(sizeof(buffer),(LPVOID)&buffer);  //取得键盘状态
    if(result != DI_OK)
		MessageBox("取得键盘状态失败!");
	if(buffer[DIK_RIGHT] & 0x80)    //判断右键是否被按下
		if(x+80 > rect.right)       //判断是否碰到右边缘
			x = rect.right - 60;
		else
			x+=20;
	if(buffer[DIK_LEFT] & 0x80)     //判断左键是否被按下
		if(x-20 < -21)              //判断是否碰到左边缘
			x = -21;
		else
			x-=20;
	if(buffer[DIK_UP] & 0x80)       //判断上键是否被按下
		if(y-20 < -21)              //判断是否碰到上边缘
			y = -21;
		else
			y-=20;
	if(buffer[DIK_DOWN] & 0x80)     //判断下键是否被按下
		if(y+80 > rect.bottom)      //判断是否碰到下边缘
			y = rect.bottom-60;
		else
			y+=20;
	if(buffer[DIK_ESCAPE] & 0x80)   //判断Esc键是否被按下
	{
		KillTimer(1);               //删除定时器
		PostMessage(WM_CLOSE);      //结束程序
	}
}