避免闪的类flickerfree

// ParticleTestView.cpp : implementation of the CParticleTestView class // #include "stdafx.h" #include "ParticleTest.h" #include "ParticleTestDoc.h" #include "ParticleTestView.h" #include <math.h> #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CParticleTestView IMPLEMENT_DYNCREATE(CParticleTestView, CView) BEGIN_MESSAGE_MAP(CParticleTestView, CView) //{{AFX_MSG_MAP(CParticleTestView) ON_WM_ERASEBKGND() ON_WM_TIMER() ON_UPDATE_COMMAND_UI(ID_MAPMODE_MM_TEXT, OnUpdateMapmodeMmText) ON_COMMAND(ID_MAPMODE_MM_TEXT, OnMapmodeMmText) ON_COMMAND(ID_MAPMODE_LOENGLISH, OnMapmodeLoenglish) ON_UPDATE_COMMAND_UI(ID_MAPMODE_LOENGLISH, OnUpdateMapmodeLoenglish) ON_COMMAND(ID_MAPMODE_MMHIGHENGLISH, OnMapmodeMmhighenglish) ON_UPDATE_COMMAND_UI(ID_MAPMODE_MMHIGHENGLISH, OnUpdateMapmodeMmhighenglish) ON_COMMAND(ID_FLICKER_OFF, OnFlickerOff) ON_UPDATE_COMMAND_UI(ID_FLICKER_OFF, OnUpdateFlickerOff) ON_COMMAND(ID_FLICKER_ON, OnFlickerOn) ON_UPDATE_COMMAND_UI(ID_FLICKER_ON, OnUpdateFlickerOn) ON_COMMAND(ID_MAPMODE_HIMETRIC, OnMapmodeHimetric) ON_UPDATE_COMMAND_UI(ID_MAPMODE_HIMETRIC, OnUpdateMapmodeHimetric) ON_COMMAND(ID_MAPMODE_LOMETRIC, OnMapmodeLometric) ON_UPDATE_COMMAND_UI(ID_MAPMODE_LOMETRIC, OnUpdateMapmodeLometric) ON_COMMAND(ID_MAPMODE_TWIPS, OnMapmodeTwips) ON_UPDATE_COMMAND_UI(ID_MAPMODE_TWIPS, OnUpdateMapmodeTwips) ON_COMMAND(ID_MAPMODE_ANISOTRIPIC, OnMapmodeAnisotripic) ON_UPDATE_COMMAND_UI(ID_MAPMODE_ANISOTRIPIC, OnUpdateMapmodeAnisotripic) //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CParticleTestView construction/destruction CParticleTestView::CParticleTestView() { m_mapmode = MM_TEXT; m_flickerFlag = FALSE; } CParticleTestView::~CParticleTestView() { m_container.Clean(); } BOOL CParticleTestView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } ///////////////////////////////////////////////////////////////////////////// // CParticleTestView drawing CString MapMode(long mapmode) { switch (mapmode) { case MM_TEXT: return _T("MM_TEXT"); case MM_TWIPS: return _T("MM_TWIPS"); case MM_LOENGLISH: return _T("MM_LOENGLISH"); case MM_HIENGLISH: return _T("MM_HIENGLISH"); case MM_LOMETRIC: return _T("MM_LOMETRIC"); case MM_HIMETRIC: return _T("MM_HIMETRIC"); case MM_ANISOTROPIC: return _T("MM_ANISOTROPIC"); } return _T("???"); } void CParticleTestView::OnDraw(CDC* dc) { CRect bounds; CRect lBounds; GetClientRect(&bounds); lBounds = bounds; if (m_flickerFlag) { dc->DPtoLP(&lBounds); dc->FillSolidRect(lBounds, dc->GetBkColor()); m_container.Draw(dc, bounds); dc->SetTextColor(RGB(255, 255, 255)); dc->SetBkMode(TRANSPARENT); dc->SetTextAlign(TA_LEFT | TA_TOP); dc->TextOut(0, 0, MapMode(dc->GetMapMode())); } else { CMemDC pDC(dc); m_container.Draw(pDC, bounds); pDC->SetTextColor(RGB(255, 255, 255)); pDC->SetBkMode(TRANSPARENT); pDC->SetTextAlign(TA_LEFT | TA_TOP); pDC->TextOut(0, 0, MapMode(pDC->GetMapMode())); } } ///////////////////////////////////////////////////////////////////////////// // CParticleTestView diagnostics #ifdef _DEBUG void CParticleTestView::AssertValid() const { CView::AssertValid(); } void CParticleTestView::Dump(CDumpContext& dc) const { CView::Dump(dc); } CParticleTestDoc* CParticleTestView::GetDocument() // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CParticleTestDoc))); return (CParticleTestDoc*)m_pDocument; } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CParticleTestView message handlers BOOL CParticleTestView::OnEraseBkgnd(CDC* pDC) { if (m_flickerFlag) { return CView::OnEraseBkgnd(pDC); } return FALSE; } void CParticleTestView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) { pDC->SetBkColor(RGB(0, 0, 0)); pDC->SetMapMode(m_mapmode); CView::OnPrepareDC(pDC, pInfo); } void CParticleTestView::OnTimer(UINT nIDEvent) { if (nIDEvent == 1) { CRect client; GetClientRect(&client); m_container.Update(client); Invalidate(); } } void CParticleTestView::OnInitialUpdate() { CRect client; CView::OnInitialUpdate(); srand( (unsigned)time( NULL ) ); SetTimer(1, 33, NULL); GetClientRect(&client); m_container.Clean(); m_container.Add(new CParentParticle( CPoint(client.left+client.Width()/2, client.top+client.Height()/2), CPoint(2, -3), RGB(255, 0, 0))); m_container.Add(new CParentParticle( CPoint(client.left+client.Width()/2, client.top+client.Height()/2), CPoint(rand()%3, rand()%7-3), RGB(0, 255, 0))); m_container.Add(new CParentParticle( CPoint(client.left+client.Width()/2, client.top+client.Height()/2), CPoint(rand()%3, rand()%7-3), RGB(100, 100, 255))); m_container.Add(new CParentParticle( CPoint(client.left+client.Width()/2, client.top+client.Height()/2), CPoint(rand()%3, rand()%7-3), RGB(250, 200, 255))); m_container.Add(new CParentParticle( CPoint(client.left+client.Width()/2, client.top+client.Height()/2), CPoint(rand()%3, rand()%7-3), RGB(243, 236, 288))); m_container.Add(new CParentParticle( CPoint(client.left+client.Width()/2, client.top+client.Height()/2), CPoint(rand()%3, rand()%7-3), RGB(255, 255, 255))); } int CParticleContainer::GetSize() const {return m_array.GetSize();} CParticle* CParticleContainer::GetAt(int index) {return m_array.GetAt(index);} void CParticleContainer::RemoveAt(int index) {m_array.RemoveAt(index);} void CParticleContainer::Add(CParticle* value) {m_array.Add(value);} void CParticleContainer::Clean() { for (int i = GetSize()-1; i >= 0; i--) { if (GetAt(i) != NULL) delete GetAt(i); RemoveAt(i); } } void CParticleContainer::Update(const CRect& bounds) { CParticleContainer container; int size = GetSize(); for (int i = 0; i < size; i++) { CParticle* pParticle = GetAt(i); if (pParticle != NULL && pParticle->UpdateTick(bounds, NULL, container)) { RemoveAt(i); delete pParticle; size = GetSize(); continue; } } size = container.GetSize(); for (i = 0; i < size; i++) { Add(container.GetAt(i)); } } void CParticleContainer::Draw(CDC* pDC, const CRect& bounds) { for (int i = 0; i < GetSize(); i++) { CParticle* pParticle = GetAt(i); if (pParticle != NULL) pParticle->Draw(pDC, bounds); } } CParentParticle::CParentParticle(CPoint loc, CPoint velocity, COLORREF color) : CParticle(loc, velocity, color) { m_pen = new CPen(PS_SOLID, 1, color); m_updateTick = 0; } CParentParticle::~CParentParticle() { if (m_pen != NULL) delete m_pen; } double Random() { static double sum = 0.0; static double count = 0.0; double retval = ((double) rand())/((double) RAND_MAX)-0.5; sum += retval; count += 1.0; return retval; } BOOL CParentParticle::UpdateTick(const CRect& bounds, CParticle* parent, CParticleContainer& decayList) { CPoint prev = m_loc; m_loc.x += m_velocity.x; m_loc.y += m_velocity.y; if (m_loc.x >= bounds.right) { m_loc.x = m_loc.x - bounds.right; } if (m_loc.x < bounds.left) { m_loc.x = bounds.right - (m_loc.x - bounds.left); } if (m_loc.y >= bounds.bottom) { m_loc.y = m_loc.y - bounds.bottom; } if (m_loc.y < bounds.top) { m_loc.y = bounds.bottom - (m_loc.y - bounds.top); } m_updateTick++; if (m_updateTick % 10 == 0) { m_velocity.x += (long) (5.0*Random()); m_velocity.y += (long) (5.0*Random()); if (m_velocity.x > 4) m_velocity.x = 4; if