VC双缓冲技术作曲线例子 修正版

// NetCtl.cpp : implementation file // #include "stdafx.h" #include "DrawMapCtl.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CMemUsgesCtl CDrawMapCtl::CDrawMapCtl() { m_iRefreshInterval = 50; m_ForeFontColor = RGB(255, 0, 0); m_ForeColor = RGB(0, 150, 0); m_BackColor = RGB(0, 0, 0); m_FreeColor = RGB(255, 255, 0); m_LableColor = RGB(255, 255, 0); m_UsedColor = RGB(0, 140, 0); memset(m_Rate,0,sizeof(WORD)*RATECOUNT); m_RateCount = 0; } CDrawMapCtl::~CDrawMapCtl() { } BEGIN_MESSAGE_MAP(CDrawMapCtl, CWnd) //{{AFX_MSG_MAP(CMemUsgesCtl) ON_WM_PAINT() ON_WM_CREATE() ON_WM_TIMER() ON_WM_SIZE() ON_WM_SHOWWINDOW() ON_WM_ERASEBKGND() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CMemUsgesCtl message handlers void CDrawMapCtl::OnPaint() { //DrawMapOfTest(); DrawChart(); //CPaintDC dc(this); } int CDrawMapCtl::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CWnd::OnCreate(lpCreateStruct) == -1) return -1; return 0; } void CDrawMapCtl::SetRefreshInterval(int iMs) { m_iRefreshInterval = iMs; SetTimer(100, m_iRefreshInterval, NULL); } void CDrawMapCtl::OnTimer(UINT nIDEvent) { Invalidate(); CWnd::OnTimer(nIDEvent); } void CDrawMapCtl::OnSize(UINT nType, int cx, int cy) { CWnd::OnSize(nType, cx, cy); } void CDrawMapCtl::OnShowWindow(BOOL bShow, UINT nStatus) { CWnd::OnShowWindow(bShow, nStatus); } void CDrawMapCtl::DrawMapOfTest() { CDC memDC; CString strLable; CBitmap memBitmap; CBitmap* pOldBmp = NULL; CString strUsges; CPen BackFreePen; CPen BackUsedPen; CPen *pOldPen = NULL; CPen *pOldMemPen = NULL; CRect rectClient; CPaintDC dc(this); GetClientRect(&rectClient); //draw cpu free usges BackFreePen.CreatePen(PS_SOLID,1, m_FreeColor); memDC.CreateCompatibleDC(&dc); pOldMemPen = memDC.SelectObject(&BackFreePen); memBitmap.CreateCompatibleBitmap(&dc, rectClient.right, rectClient.bottom); pOldBmp = memDC.SelectObject(&memBitmap); int m_iGridHeight = rectClient.Height() / 50; for(int i = 0; i < 50 - (int)(30 / 2); i ++) { memDC.MoveTo(rectClient.left + 12, rectClient.top + i * m_iGridHeight + 12); memDC.LineTo(rectClient.right - 12, rectClient.top + i * m_iGridHeight + 12); } //draw line BackUsedPen.CreatePen(PS_SOLID, 1, m_UsedColor); memDC.SelectObject(&BackUsedPen); for(int j = 0; j < (int)(30 / 2); j ++) //fill used percent { memDC.MoveTo(rectClient.left + 12, rectClient.bottom - j * m_iGridHeight - 12); memDC.LineTo(rectClient.right - 12, rectClient.bottom - j * m_iGridHeight - 12); } strLable = _T("Memory"); memDC.SetBkMode(TRANSPARENT); memDC.SetTextAlign(TA_LEFT); memDC.SetTextColor(m_LableColor); memDC.TextOut(rectClient.left + 40, rectClient.top + 30, strLable); strUsges.Format("%u", 30); strUsges += "%"; memDC.SetTextAlign(TA_LEFT | TA_CENTER); memDC.SetTextColor(m_ForeFontColor); memDC.TextOut(rectClient.left + rectClient.Width() / 2 - 10, rectClient.bottom - 60, strUsges); dc.BitBlt(rectClient.left, rectClient.top, rectClient.right, rectClient.bottom, &memDC, 0, 0, SRCCOPY); memDC.SelectObject(pOldBmp); memDC.SelectObject(pOldMemPen); memDC.DeleteDC(); memBitmap.DeleteObject(); } BOOL CDrawMapCtl::OnEraseBkgnd(CDC* pDC) { return TRUE;//CWnd::OnEraseBkgnd(pDC); } BOOL CDrawMapCtl::Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID) { return CWnd::Create(NULL, NULL, dwStyle, rect, pParentWnd, nID, NULL); } void CDrawMapCtl::Release() { KillTimer(100); } void CDrawMapCtl::DrawChart() { CDC memDC; CString strLable; CBitmap memBitmap; CBitmap* pOldBmp = NULL; CString strUsges; CPen BackFreePen; CPen BackUsedPen; CPen *pOldPen = NULL; CPen *pOldMemPen = NULL; CRect rectClient; CPaintDC dc(this); GetClientRect(&rectClient); memDC.CreateCompatibleDC(&dc); memBitmap.CreateCompatibleBitmap(&dc, rectClient.right, rectClient.bottom); pOldBmp = memDC.SelectObject(&memBitmap); BackFreePen.CreatePen(PS_SOLID,1, m_FreeColor); pOldMemPen = memDC.SelectObject(&BackFreePen); //*** Coordinate(memDC,rectClient); //*** BackUsedPen.CreatePen(PS_SOLID,1, m_UsedColor); memDC.SelectObject(&BackUsedPen); DrawCurve(memDC,rectClient); /* int m_iGridHeight = rectClient.Height() / 50; for(int i = 0; i < 50 - (int)(30 / 2); i ++) { memDC.MoveTo(rectClient.left + 12, rectClient.top + i * m_iGridHeight + 12); memDC.LineTo(rectClient.right - 12, rectClient.top + i * m_iGridHeight + 12); } //draw line BackUsedPen.CreatePen(PS_SOLID, 1, m_UsedColor); memDC.SelectObject(&BackUsedPen); for(int j = 0; j < (int)(30 / 2); j ++) //fill used percent { memDC.MoveTo(rectClient.left + 12, rectClient.bottom - j * m_iGridHeight - 12); memDC.LineTo(rectClient.right - 12, rectClient.bottom - j * m_iGridHeight - 12); } strLable = _T("Memory"); memDC.SetBkMode(TRANSPARENT); memDC.SetTextAlign(TA_LEFT); memDC.SetTextColor(m_LableColor); memDC.TextOut(rectClient.left + 40, rectClient.top + 30, strLable); strUsges.Format("%u", 30); strUsges += "%"; memDC.SetTextAlign(TA_LEFT | TA_CENTER); memDC.SetTextColor(m_ForeFontColor); memDC.TextOut(rectClient.left + rectClient.Width() / 2 - 10, rectClient.bottom - 60, strUsges); */ dc.BitBlt(rectClient.left, rectClient.top, rectClient.right, rectClient.bottom, &memDC, 0, 0, SRCCOPY); memDC.SelectObject(pOldBmp); memDC.SelectObject(pOldMemPen); memDC.DeleteDC(); memBitmap.DeleteObject(); } void CDrawMapCtl::Coordinate(CDC &memDC,const CRect &rectClient) { int i; //***** int iMapLeft,iMapRight,iMapTop,iMapBottom,iDelta1=10,iDelta2=30; iMapLeft=rectClient.left+iDelta2; iMapTop=rectClient.top+iDelta1; iMapRight=rectClient.right-iDelta1; iMapBottom=rectClient.bottom-iDelta2; memDC.MoveTo(iMapLeft,iMapTop); memDC.LineTo(iMapLeft,iMapBottom); //纵坐标 memDC.LineTo(iMapRight,iMapBottom); //横坐标 //******** //纵坐标的箭头 memDC.MoveTo(iMapLeft,iMapTop); memDC.LineTo(iMapLeft-5,iMapTop+10); memDC.MoveTo(iMapLeft,iMapTop); memDC.LineTo(iMapLeft+5,iMapTop+10); //横坐标的箭头 memDC.MoveTo(iMapRight,iMapBottom); memDC.LineTo(iMapRight-10,iMapBottom-5); memDC.MoveTo(iMapRight,iMapBottom); memDC.LineTo(iMapRight-10,iMapBottom+5); //********* int iSumDelta=0,iDelta; //横坐标的分度格 iXParts个分度 int iXParts=30; int iTempX; iDelta=(iMapRight-iMapLeft)/iXParts; for(i=1;i<iXParts;i++) { iSumDelta+=iDelta; iTempX=iMapLeft+iSumDelta; memDC.MoveTo(iTempX,iMapBottom); if(i%2==0) { memDC.LineTo(iTempX,iMapBottom-5); } else { memDC.LineTo(iTempX,iMapBottom-3); } } iSumDelta+=iDelta; iTempX=iMapLeft+iSumDelta; if( (iMapRight-iTempX)>5 ) { memDC.MoveTo(iTempX,iMapBottom); if(i%2==0) { memDC.LineTo(iTempX,iMapBottom-5); } else { memDC.LineTo(iTempX,iMapBottom-3); } } //纵坐标的分度格 iYParts个分度 int iYParts=40; int iTempY; iSumDelta=0; iDelta=(iMapBottom-iMapTop)/iYParts; for(i=1;i<iYParts;i++) { iSumDelta+=iDelta; iTempY=iMapBottom-iSumDelta; memDC.MoveTo(iMapLeft,iTempY); if(i%2==0) { memDC.LineTo(iMapLeft+5,iTempY); } else { memDC.LineTo(iMapLeft+3,iTempY); } } iSumDelta+=iDelta; iTempY=iMapBottom-iSumDelta; if( (iTempY-iMapTop)>5) { memDC.MoveTo(iMapLeft,iTempY); if(i%2==0) { memDC.LineTo(iMapLeft+5,iTempY); } else { memDC.LineTo(iMapLeft+3,iTempY); } } //*****画中间线 iSumDelta=iDelta*iYParts/2; iTempY=iMapBottom-iSumDelta;