CH4-8.rar_下雪_雪景

// 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 struct snow { int x; int y; BOOL exist; }; ///////////////////////////////////////////////////////////////////////////// // canvasFrame IMPLEMENT_DYNCREATE(canvasFrame, CFrameWnd) int i,count; snow drop[50]; 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; mdc1 = new CDC; mdc->CreateCompatibleDC(&dc); mdc1->CreateCompatibleDC(&dc); bgbmp = new CBitmap; snow = new CBitmap; mask = new CBitmap; temp = new CBitmap; bgbmp->m_hObject = (HBITMAP)::LoadImage(NULL,"bground.bmp",IMAGE_BITMAP,rect.right,rect.bottom,LR_LOADFROMFILE); snow->m_hObject = (HBITMAP)::LoadImage(NULL,"snow.bmp",IMAGE_BITMAP,20,20,LR_LOADFROMFILE); mask->m_hObject = (HBITMAP)::LoadImage(NULL,"mask.bmp",IMAGE_BITMAP,20,20,LR_LOADFROMFILE); temp->CreateCompatibleBitmap(&dc,rect.right,rect.bottom); mdc->SelectObject(temp); } canvasFrame::~canvasFrame() { delete bgbmp; delete snow; delete mask; delete temp; delete mdc; delete mdc1; } 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) { if(count<50) { drop[count].x = rand()%rect.right; drop[count].y = 0; drop[count].exist = true; count++; } CClientDC dc(this); mdc1->SelectObject(bgbmp); mdc->BitBlt(0,0,rect.right,rect.bottom,mdc1,0,0,SRCCOPY); for(i=0;i<50;i++) { if(drop[i].exist) { mdc1->SelectObject(mask); mdc->BitBlt(drop[i].x,drop[i].y,20,20,mdc1,0,0,SRCAND); mdc1->SelectObject(snow); mdc->BitBlt(drop[i].x,drop[i].y,20,20,mdc1,0,0,SRCPAINT); if(rand()%2==0) drop[i].x+=3; else drop[i].x-=3; drop[i].y+=10; if(drop[i].y > rect.bottom) { drop[i].x = rand()%rect.right; drop[i].y = 0; } } } dc.BitBlt(0,0,rect.right,rect.bottom,mdc,0,0,SRCCOPY); CFrameWnd::OnTimer(nIDEvent); } int canvasFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CFrameWnd::OnCreate(lpCreateStruct) == -1) return -1; SetTimer(1,0,NULL); return 0; }