图表类 BarChart

/********************************************************************* * BarChart.cpp * implementation of * CChartBar, * CChartData, * CChartPrinter, * CChartGCalc, * CGDIGrid, * * Auther: Hamed.M. * EMail : HamedMosavi @ gmail.com * * CAUTION Disclaimer: * This code is provided as is without any warranty of * any kind. The author is not responsible for whatever * problem or damages that may occur as aresault of using * this code. Use this entirely at your own risk. * So don't try to find me if this code made your dog * Sound like a frog, or burned your car, or even made your * girl/boy friend shout on you. I am not responsible ;) * * ********************************************************************/ /******************************************************************** * History: * * Released : 2007/01/11 * * BugFixes: * 2007/01/11 * unsigned long double converted to -> double * Some scaling bugs fixed * Tooltips added * * 2007/01/15 * Some function changed. * Tooltip updated. * Some comments added. * * 2007/01/20 * Tooltips now behave much like tooltips(!) * * 2007/01/24 * Database connectivity added. * * 2007/01/26 * Tooltip bug fixed (SetCapture added). ********************************************************************/ #include "stdafx.h" #include "BarChart.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif /////////////////////////////////////////////////////////////////////// // CBarChart Class // // Represents a chart control. The chart shows some bars // Each bar has a value. Bars heights will be calculated // Regarding other bars. The bars are able to show a percentage // Instead of a value. The bar with maximum value has 100% and // Percentage of other bars will be calculated in accordance to // This maximum value. // /////////////////////////////////////////////////////////////////////// CBarChart::CBarChart() { m_rctClient = CRect(0, 0, 0, 0); SetBKColor(RGB(240, 240, 240)); m_pBmpBars = NULL; m_pBmpOld = NULL; ShowLabel(TRUE); ShowGrid(TRUE); ShowBarText(1, TRUE); SetAutoScale(FALSE); ShowTooltip(TRUE); m_szTitle = ""; m_szLastErr = ""; } CBarChart::~CBarChart() { if (m_brFrame.GetSafeHandle()) { m_brFrame.DeleteObject(); } if (m_pBmpOld) { m_dcMem.SelectObject(m_pBmpOld); } if (m_pBmpBars) { m_pBmpBars->DeleteObject(); delete m_pBmpBars; m_pBmpBars = NULL; } if (m_dcMem.GetSafeHdc()) { m_dcMem.DeleteDC(); } } BEGIN_MESSAGE_MAP(CBarChart, CWnd) //{{AFX_MSG_MAP(CBarChart) ON_WM_ERASEBKGND() ON_WM_PAINT() ON_WM_MOUSEMOVE() ON_WM_SIZE() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CBarChart message handlers // Creates the child control. // Parameters: // rect : Defines bounding rectangle of the control // pParentWnd : A pointer to the window on which this control will be shown // nControlID : Identifyer of the control // szChartTitle: Defines the title at the bottom of the control, can be a simple description of the chart. BOOL CBarChart::Create(const RECT &rect, CWnd *pParentWnd, UINT nControlID, CString szChartTitle) { if (GetSafeHwnd()) { return FALSE; } m_rctClient = rect; m_szTitle = szChartTitle; BOOL bRes = CWnd::Create( NULL, NULL, WS_CHILD|WS_VISIBLE, rect, pParentWnd, nControlID ); if (TRUE == bRes) { InitToolTips(); } return bRes; } BOOL CBarChart::OnEraseBkgnd(CDC* pDC) { return TRUE; } void CBarChart::OnPaint() { CPaintDC dc(this); GetClientRect(&m_rctClient); if (m_dcMem.GetSafeHdc()) { if (m_bAutoScale) { dc.StretchBlt(0, 0, m_rctClient.Width(), m_rctClient.Height(), &m_dcMem, 0, 0, m_rctMemPic.Width(), m_rctMemPic.Height(), SRCCOPY); } else { dc.BitBlt(0, 0, m_rctClient.Width(), m_rctClient.Height(), &m_dcMem, 0, 0, SRCCOPY); } } else { RedrawChart(&dc); } } // Prints the content of the child control (WYSIWYG) // Parameters: // bCompatible : // Default is set to FALSE // Set this TRUE if you have any difficaulty printing your chart. // It's defined since some printers might not be able to print DDB // Bitmaps, setting this to TRUE force the function to use DIB instead. void CBarChart::Print(BOOL bCompatible) { CClientDC dc(this); m_printer.Print(&dc, &m_dcMem, m_pBmpBars, (CString)AfxGetAppName() + (CString)" - " + (CString)m_szTitle, m_rctMemPic, m_bAutoScale, bCompatible); } void CBarChart::RedrawChart(CDC* pDC) { if (!m_dcMem.GetSafeHdc()) { m_dcMem.CreateCompatibleDC(pDC); } // Deselect and destroy old bitmap, and create a new one ResetBitmap(pDC); Refresh(); } void CBarChart::ResetBitmap(CDC* pDC) { // Deselect and destroy old bitmap if (m_pBmpOld) { m_dcMem.SelectObject(m_pBmpOld); } if (m_pBmpBars) { m_pBmpBars->DeleteObject(); delete m_pBmpBars; m_pBmpBars = NULL; } // Re create bitmap m_rctMemPic.top = 0; m_rctMemPic.left = 0; m_rctMemPic.bottom = m_bars.GetBarHeight(); m_rctMemPic.right = m_bars.GetBarWidth(); if (m_rctMemPic.Width()<m_rctClient.Width()) { m_rctMemPic.right = m_rctClient.Width(); } if (m_rctMemPic.Height()<m_rctClient.Height()) { m_rctMemPic.bottom = m_rctClient.Height(); } m_pBmpBars = new CBitmap; m_pBmpBars->CreateCompatibleBitmap(pDC, m_rctMemPic.right, m_rctMemPic.bottom); m_pBmpOld = (CBitmap*)m_dcMem.SelectObject(m_pBmpBars); } // Sets/Resets the scale capability // Parameters: // bAutoScale : // If set to TRUE force the chart to scale itself to the parent // Window, regardless of it's initial bounding rectangle. // If set to FALSE returns the size of the chart to the original // Bounding rectangle. // Note that chart saves it's initial state of creation. void CBarChart::SetAutoScale(BOOL bAutoScale) { m_bAutoScale = bAutoScale; } // Sets the color of the background rectangle of the chart // Parameters: // colorBK : // The color in COLORREF format(eg.RGB(250,250,250)) void CBarChart::SetBKColor(COLORREF colorBK) { // Reset background color m_colorBK = colorBK; // Reset frame brush if (m_brFrame.GetSafeHandle()) { m_brFrame.DeleteObject(); } m_brFrame.CreateSolidBrush(DifColor(colorBK, CHART_BORDER_DARKNESS)); // Reset grid m_grid.SetColor(DifColor(colorBK, 50)); // Redraw window, if it is created if (GetSafeHwnd()) { Invalidate(); } } // Adds a bar to the chart // Parameters: // udValue : Value of the bar // szLabel : Label of the bar, will be shown under the bar // color : Color of the bar. This color will be used to create a gradient. // bRepaint: If set to TRUE, forces the chart to show changes on the screen // Default is set to false. It is recommended to set it to true just // For last Add bar of the chart, so the chart won't be forced to // Show changes every time a single bar is added. void CBarChart::AddBar(double udValue, CString szLabel, COLORREF color, BOOL bRepaint) { m_bars.AddBar(udValue, szLabel, color); if (bRepaint) { CClientDC dc(this); RedrawChart(&dc); Invalidate(); } } // Shows/Hides the labels under the chart control // Parameters: // bShow : Set to TRUE to show labels // bRedraw: If set to TRUE, forces the chart to show changes on the screen // Default is set to false. void CBarChart::ShowLabel(BOOL bShow, BOOL bRedraw) { m_bars.ShowLabel(bShow); if(bRedraw) { Refresh(); } } // Shows/Hides the grid behind t