CStatic 制作漫天繁星动画显示控件

/****************************************************************/ /* */ /* StarWarsCtrl.cpp */ /* */ /* Implementation of the CStarWarsCtrl.cpp class. */ /* */ /* Programmed by Pablo van der Meer */ /* Copyright Pablo Software Solutions 2002 */ /* http://www.pablovandermeer.nl */ /* */ /* Last updated: 26 may 2002 */ /* */ /****************************************************************/ #include "stdafx.h" #include "Stars.h" #include "StarWarsCtrl.h" #include <math.h> #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define getrandom(min,max) ((rand()%(int)(((max)+1)-(min)))+(min)); CStarWarsCtrl::CStarWarsCtrl() { // protected bitmaps to restore the memory DC's m_pOldBitmap = NULL; m_Font.CreateFont(24, 0, 0, 0, FW_BOLD, FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH|FF_SWISS, "Tahoma"); m_nScrollSpeed = 2; m_nStarsSpeed = 30; } CStarWarsCtrl::~CStarWarsCtrl() { if (m_pOldBitmap != NULL) m_MainDC.SelectObject(m_pOldBitmap); } BEGIN_MESSAGE_MAP(CStarWarsCtrl, CStatic) //{{AFX_MSG_MAP(CStarWarsCtrl) ON_WM_PAINT() ON_WM_SIZE() ON_WM_TIMER() //}}AFX_MSG_MAP END_MESSAGE_MAP() /********************************************************************/ /* */ /* Function name : PreSubclassWindow */ /* Description : Initialize some stuff */ /* */ /********************************************************************/ void CStarWarsCtrl::PreSubclassWindow() { CClientDC dc(this); GetClientRect(m_rectClient); // initialize stars for (int i = 0; i < NUM_STARS; i++) { m_StarArray[i].x = getrandom(0, 1024); m_StarArray[i].x -= 512; m_StarArray[i].y = getrandom(0, 1024); m_StarArray[i].y -= 512; m_StarArray[i].z = getrandom(0, 512); m_StarArray[i].z -= 256; } /* m_TextLines.Add("A long time ago"); m_TextLines.Add(""); m_TextLines.Add("in a galaxy far far away"); m_TextLines.Add(""); m_TextLines.Add("this application was programmed by"); m_TextLines.Add(""); m_TextLines.Add("Pablo van der Meer"); m_TextLines.Add(""); m_TextLines.Add("Have fun!"); */ m_nScrollPos = m_rectClient.Height(); // calculate speed so that it scroll the same speed on a different machine DWORD t1 = GetTickCount(); InvalidateCtrl(); DWORD t2 = GetTickCount(); t2 -= t1; // = 50 on my system m_nScrollSpeed = (m_nScrollSpeed * t2)/50; SetTimer(1, 75, NULL); CStatic::PreSubclassWindow(); } /********************************************************************/ /* */ /* Function name : OnPaint */ /* Description : Called when the application makes a request to */ /* repaint a portion of the window. */ /* */ /********************************************************************/ void CStarWarsCtrl::OnPaint() { CPaintDC dc(this); // device context for painting CDC memDC; CBitmap memBitmap; CBitmap* oldBitmap; // to avoid flicker, establish a memory dc, draw to it // and then BitBlt it to the client memDC.CreateCompatibleDC(&dc); memBitmap.CreateCompatibleBitmap(&dc, m_rectClient.Width(), m_rectClient.Height()); oldBitmap = (CBitmap *)memDC.SelectObject(&memBitmap); if (memDC.GetSafeHdc() != NULL) { // first drop the bitmap on the memory dc memDC.BitBlt(0, 0, m_rectClient.Width(), m_rectClient.Height(), &m_MainDC, 0, 0, SRCCOPY); // finally send the result to the display dc.BitBlt(0, 0, m_rectClient.Width(), m_rectClient.Height(), &memDC, 0, 0, SRCCOPY); } memDC.SelectObject(oldBitmap); } /********************************************************************/ /* */ /* Function name : OnSize */ /* Description : The framework calls this member function after */ /* the window�s size has changed. */ /* */ /********************************************************************/ void CStarWarsCtrl::OnSize(UINT nType, int cx, int cy) { CStatic::OnSize(nType, cx, cy); // OnSize automatically gets called during the setup of the control GetClientRect(m_rectClient); // destroy and recreate the main bitmap CClientDC dc(this); if (m_pOldBitmap && m_MainBitmap.GetSafeHandle() && m_MainDC.GetSafeHdc()) { m_MainDC.SelectObject(m_pOldBitmap); m_MainBitmap.DeleteObject(); m_MainBitmap.CreateCompatibleBitmap(&dc, m_rectClient.Width(), m_rectClient.Height()); m_pOldBitmap = m_MainDC.SelectObject(&m_MainBitmap); } } /********************************************************************/ /* */ /* Function name : DoStars */ /* Description : Draw stars */ /* */ /********************************************************************/ void CStarWarsCtrl::DoStars(CDC *pDC) { m_MainDC.SetBkColor(RGB(0,0,0)); m_MainDC.SetTextColor(RGB(255,255,255)); m_MainDC.FillSolidRect(m_rectClient, RGB(0,0,0)); int nFunFactor = 100; int x, y, z; for(int i = 0; i < NUM_STARS; i++) { m_StarArray[i].z = m_StarArray[i].z - m_nStarsSpeed; if (m_StarArray[i].z > 255) { m_StarArray[i].z = -255; } if (m_StarArray[i].z < -255) { m_StarArray[i].z = 255; } z = m_StarArray[i].z + 256; x = (m_StarArray[i].x * nFunFactor / z) + (m_rectClient.Width() / 2); y = (m_StarArray[i].y * nFunFactor / z) + (m_rectClient.Height() / 2); CPen myPen; // create a white pen which luminosity depends on the z position (for 3D effect!) int nColor = 255 - m_StarArray[i].z; myPen.CreatePen(PS_COSMETIC, 1, RGB(nColor,nColor,nColor)); CPen *pOldPen = (CPen *)m_MainDC.SelectObject(&myPen); // draw star m_MainDC.Ellipse(CRect(x, y, x+3, y+3)); m_MainDC.SelectObject(pOldPen); } } /********************************************************************/ /* */ /* Function name : InvalidateCtrl */ /* Description : Draw the Matrix to a bitmap. */ /* */ /********************************************************************/ void CStarWarsCtrl::InvalidateCtrl() { // in case we haven't established the memory dc's CClientDC dc(this); // if we don't have one yet, set up a memory dc for the control if (m_MainDC.GetSafeHdc() == NULL) { m_MainDC.CreateCompatibleDC(&dc); m_MainBitmap.CreateCompatibleBitmap(&dc, m_rectClient.Width(), m_rectClient.Height()); m_pOldBitmap = m_MainDC.SelectObject(&m_MainBitmap); } DoStars(&dc); DoScrollText(&dc); // finally, force redraw InvalidateRect(m_rectClient); } /********************************************************************/ /* */ /* Function name : OnTimer */ /* Description : Update display */ /* */ /********************************************************************/ void CStarWarsCtrl::OnTimer(UINT nIDEvent) { if (nIDEvent == 1) InvalidateCtrl(); CStatic::OnTimer(nIDEvent); } /********************************************************************/ /* */ /* Function name : DoScrollText */ /* Description : Do scrolling text like in the movie 'Star Wars' */ /* */ /********************************************************************/ void CStarWarsCtrl::DoScrollText(CDC *pDC) { int nPosX =0; int nPosY =0; CDC memDC; CBitmap memBitmap; CFont *oldFont; memDC.CreateCompatibleDC(pDC); memBitmap.CreateCompatibleBitmap(pDC, m_rectClient.Width(), m_rectClient.Height());