canvasframe.cpp

《Visual C++游戏设计入门》的配套代码

// canvasFrame.cpp : implementation file
//

#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)
int vx=-5,x=700,i,b,g,r;
canvasFrame::canvasFrame()
{
	Create(NULL,"绘图窗口",WS_OVERLAPPEDWINDOW,CRect(0,0,800,300));
	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);
	//以下程序代码建立各个要用的 DC
	mdc = new CDC;
	mdc1 = new CDC;
	mdc2 = new CDC;
	mdc->CreateCompatibleDC(&dc);
	mdc1->CreateCompatibleDC(&dc);
	mdc2->CreateCompatibleDC(&dc);
	//以下程序代码建立与加载要用的位图对象
	car = new CBitmap;
	forest = new CBitmap;
	mask = new CBitmap;
	temp = new CBitmap;
	dark = new CBitmap;
	car->m_hObject = (HBITMAP)::LoadImage(NULL,"car.bmp",IMAGE_BITMAP,112,64,LR_LOADFROMFILE);
	forest->m_hObject = (HBITMAP)::LoadImage(NULL,"forest.bmp",IMAGE_BITMAP,800,300,LR_LOADFROMFILE);
	mask->m_hObject = (HBITMAP)::LoadImage(NULL,"mask.bmp",IMAGE_BITMAP,800,300,LR_LOADFROMFILE);
	temp->CreateCompatibleBitmap(&dc,rect.right,rect.bottom);
	dark->CreateCompatibleBitmap(&dc,112,64);
	mdc->SelectObject(temp);   //设定 mdc 中存储的位图
	car->GetObject(sizeof(BITMAP),&bm);
	px = new unsigned char[bm.bmHeight*bm.bmWidthBytes];
	car->GetBitmapBits(bm.bmHeight*bm.bmWidthBytes,px);
	mdc2->SelectObject(dark);  //设定 mdc2 中存储的位图
}

canvasFrame::~canvasFrame()
{
	delete mdc;
	delete mdc1;
	delete mdc2;
	delete car;
	delete forest;
	delete mask;
	delete dark;
	delete temp;
	delete px;
}

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

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

void canvasFrame::OnTimer(UINT nIDEvent) 
{
	CFrameWnd::OnTimer(nIDEvent);
	CClientDC dc(this);
	mdc->BitBlt(0,0,800,300,mdc1,0,0,WHITENESS);
	mdc1->SelectObject(car);
	mdc->BitBlt(x,160,112,64,mdc1,0,0,SRCCOPY);
	mdc1->SelectObject(mask);
	mdc2->BitBlt(0,0,112,64,mdc1,x,160,SRCCOPY);
	dark->GetObject(sizeof(BITMAP),&bm);
	unsigned char *px1 = new unsigned char[bm.bmHeight*bm.bmWidthBytes];
	dark->GetBitmapBits(bm.bmHeight*bm.bmWidthBytes,px1);
	for(i=0;i<bm.bmHeight*bm.bmWidthBytes;i+=3)
	{
		if(px[i] != 255 && px[i+1] != 255 && px[i+2] !=255)
		{
			b = px[i] & px1[i];
			g = px[i+1] & px1[i+1];
			r = px[i+2] & px1[i+2];
			if(b == 0 && g==0 && r==0)
			{
				mdc->TextOut(300,50,"车子在树林中...");
				break;
			}
		}
	}
	delete px1;
	mdc->BitBlt(0,0,800,300,mdc1,0,0,SRCAND);
	mdc1->SelectObject(forest);
	mdc->BitBlt(0,0,800,300,mdc1,0,0,SRCPAINT);
	dc.BitBlt(0,0,800,300,mdc,0,0,SRCCOPY);
	if(x<-112)           //判断车子是否已完全没入窗口中
		KillTimer(nIDEvent);   //停止定时器
	x+=vx;               //计算下一次的贴图坐标
}

int canvasFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
		return -1;
	SetTimer(1,0,NULL);
	return 0;
}