（一）如何用ChartDirector绘制滚动图表

ChartDirector是一个非常容易上手的Web图表控件，参照它的JSP例子，简单修改一下就可以创建一系列基于Web的图表。下面跟大家分享用ChartDirector(C++)绘制的可滚动和缩放的图表。下面为大家奉上了源代码，首先解释一下代码的组成部分：

• 初始化：将数据加载到内存，然后初始化CChartViewer；
• CVN_ViewPortChanged消息处理器：用于更新图表和图像映射；
• drawChart：这是创建图表的核心部分。首先用ViewPortManager.getValueAtViewPort获取可见数据范围，然后获取 数据范围中的值。最后用ViewPortManager.syncDateAxisWithViewPort将X轴配置与视图端口同步。

下面是绘制一个可滚动和缩放图表的主要源代码，完整代码请参考ChartDirector MFC项目中的"mfcdemo/simplezoomscroll"

[File: mfcdemo/simplezoomscroll/simplezoomscrollDlg.cpp]

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// simplezoomscrollDlg.cpp : implementation file //   #include "stdafx.h" #include "simplezoomscroll.h" #include "simplezoomscrollDlg.h" #include "chartdir.h" #include <math.h>   #ifdef _DEBUG #define new DEBUG_NEW #endif   ///////////////////////////////////////////////////////////////////////////// // CSimplezoomscrollDlg dialog   // // Constructor // CSimplezoomscrollDlg::CSimplezoomscrollDlg(CWnd* pParent /*=NULL*/)     : CDialog(CSimplezoomscrollDlg::IDD, pParent) {     m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }   // // Destructor // CSimplezoomscrollDlg::~CSimplezoomscrollDlg() {     delete m_ranSeries;     delete m_ChartViewer.getChart(); }   void CSimplezoomscrollDlg::DoDataExchange(CDataExchange* pDX) {     CDialog::DoDataExchange(pDX);     //{{AFX_DATA_MAP(CSimplezoomscrollDlg)     DDX_Control(pDX, IDC_PointerPB, m_PointerPB);     DDX_Control(pDX, IDC_ChartViewer, m_ChartViewer);     //}}AFX_DATA_MAP }   BEGIN_MESSAGE_MAP(CSimplezoomscrollDlg, CDialog)     //{{AFX_MSG_MAP(CSimplezoomscrollDlg)     ON_WM_PAINT()     ON_WM_QUERYDRAGICON()     ON_WM_DESTROY()     ON_BN_CLICKED(IDC_PointerPB, OnPointerPB)     ON_BN_CLICKED(IDC_ZoomInPB, OnZoomInPB)     ON_BN_CLICKED(IDC_ZoomOutPB, OnZoomOutPB)     ON_CONTROL(CVN_ViewPortChanged, IDC_ChartViewer, OnViewPortChanged)     //}}AFX_MSG_MAP END_MESSAGE_MAP()   ///////////////////////////////////////////////////////////////////////////// // CSimplezoomscrollDlg message handlers   // // Initialization // BOOL CSimplezoomscrollDlg::OnInitDialog() {     CDialog::OnInitDialog();       // *** code automatically generated by VC++ MFC AppWizard ***     // Set the icon for this dialog.  The framework does this automatically     //  when the application's main window is not a dialog     SetIcon(m_hIcon, TRUE);         // Set big icon     SetIcon(m_hIcon, FALSE);        // Set small icon           // Load icons to mouse usage buttons     loadButtonIcon(IDC_PointerPB, IDI_PointerPB, 100, 20);      loadButtonIcon(IDC_ZoomInPB, IDI_ZoomInPB, 100, 20);        loadButtonIcon(IDC_ZoomOutPB, IDI_ZoomOutPB, 100, 20);       //     // Initialize member variables     //     m_extBgColor = getDefaultBgColor();     // Default background color       // Load the data     loadData();       // Initialize the CChartViewer     initChartViewer(&m_ChartViewer);       // Trigger the ViewPortChanged event to draw the chart     m_ChartViewer.updateViewPort(true, true);     return TRUE; }   // *** code automatically generated by VC++ MFC AppWizard *** // If you add a minimize button to your dialog, you will need the code below // to draw the icon.  For MFC applications using the document/view model, // this is automatically done for you by the framework. void CSimplezoomscrollDlg::OnPaint() {     if (IsIconic())     {         CPaintDC dc(this); // device context for painting           SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);           // Center icon in client rectangle         int cxIcon = GetSystemMetrics(SM_CXICON);         int cyIcon = GetSystemMetrics(SM_CYICON);         CRect rect;         GetClientRect(&rect);         int x = (rect.Width() - cxIcon + 1) / 2;         int y = (rect.Height() - cyIcon + 1) / 2;           // Draw the icon         dc.DrawIcon(x, y, m_hIcon);     }     else     {         CDialog::OnPaint();     } }   // *** code automatically generated by VC++ MFC AppWizard *** // The system calls this to obtain the cursor to display while the user drags //  the minimized window. HCURSOR CSimplezoomscrollDlg::OnQueryDragIcon() {     return (HCURSOR) m_hIcon; }   // // User clicks on the Pointer pushbutton // void CSimplezoomscrollDlg::OnPointerPB() {     m_ChartViewer.setMouseUsage(Chart::MouseUsageScroll);   }   // // User clicks on the Zoom In pushbutton // void CSimplezoomscrollDlg::OnZoomInPB() {     m_ChartViewer.setMouseUsage(Chart::MouseUsageZoomIn);   }   // // User clicks on the Zoom Out pushbutton // void CSimplezoomscrollDlg::OnZoomOutPB() {     m_ChartViewer.setMouseUsage(Chart::MouseUsageZoomOut);  }   // // The ViewPortChanged event handler. This event occurs if the user scrolls or zooms in or // out the chart by dragging or clicking on the chart. It can also be triggered by calling // CChartViewer.updateViewPort. // void CSimplezoomscrollDlg::OnViewPortChanged() {     if (m_ChartViewer.needUpdateChart())         drawChart(&m_ChartViewer);     if (m_ChartViewer.needUpdateImageMap())         updateImageMap(&m_ChartViewer); }   ///////////////////////////////////////////////////////////////////////////// // CSimplezoomscrollDlg methods   // // Load the data // void CSimplezoomscrollDlg::loadData() {     // In this example, we just use random numbers as data.     m_ranSeries = new RanSeries(127);     m_timeStamps = m_ranSeries->getDateSeries(1827, Chart::chartTime(2007, 1, 1), 86400);     m_dataSeriesA = m_ranSeries->getSeries(1827, 150, -10, 10);     m_dataSeriesB = m_ranSeries->getSeries(1827, 200, -10, 10);     m_dataSeriesC = m_ranSeries->getSeries(1827, 250, -8, 8); }   // // Initialize the CChartViewer // void CSimplezoomscrollDlg::initChartViewer(CChartViewer *viewer) {     // Set the full x range to be the duration of the data     viewer->setFullRange("x", m_timeStamps[0], m_timeStamps[m_timeStamps.len - 1]);       // Initialize the view port to show the latest 20% of the time range     viewer->setViewPortWidth(0.2);     viewer->setViewPortLeft(1 - viewer->getViewPortWidth());       // Set the maximum zoom to 10 points     viewer->setZoomInWidthLimit(10.0 / m_timeStamps.len);       // Initially set the mouse to drag to scroll mode.     m_PointerPB.SetCheck(1);     viewer->setMouseUsage(Chart::MouseUsageScroll); }   // // Draw the chart and display it in the given viewer // void CSimplezoomscrollDlg::drawChart(CChartViewer *viewer) {     // Get the start date and end date that are visible on the chart.     double viewPortStartDate = viewer->getValueAtViewPort("x", viewer->getViewPortLeft());     double viewPortEndDate = viewer->getValueAtViewPort("x", viewer->getViewPortLeft() +         viewer->getViewPortWidth());       // Get the array indexes that corresponds to the visible start and end dates     int startIndex = (int)floor(Chart::bSearch(m_timeStamps, viewPortStartDate));     int endIndex = (int)ceil(Chart::bSearch(m_timeStamps, viewPortEndDate));     int noOfPoints = endIndex - startIndex + 1;       // Extract the part of the data array that are visible.     DoubleArray viewPortTimeStamps = DoubleArray(m_timeStamps.data + startIndex, noOfPoints);     DoubleArray viewPortDataSeriesA = DoubleArray(m_dataSeriesA.data + startIndex, noOfPoints);     DoubleArray viewPortDataSeriesB = DoubleArray(m_dataSeriesB.data + startIndex, noOfPoints);     DoubleArray viewPortDataSeriesC = DoubleArray(m_dataSeriesC.data + startIndex, noOfPoints);       //     // At this stage, we have extracted the visible data. We can use those data to plot the chart.     //       ///////////////////////////////////////////////////////////////////////////////////////     // Configure overall chart appearance.     ///////////////////////////////////////////////////////////////////////////////////////       // Create an XYChart object 600 x 300 pixels in size, with pale blue (0xf0f0ff) background,     // black (000000) rounded border, 1 pixel raised effect.     XYChart *c = new XYChart(600, 300, 0xf0f0ff, 0, 1);     c->setRoundedFrame(m_extBgColor);       // Set the plotarea at (52, 60) and of size 520 x 205 pixels. Use white (ffffff) background.     // Enable both horizontal and vertical grids by setting their colors to grey (cccccc). Set     // clipping mode to clip the data lines to the plot area.     c->setPlotArea(52, 60, 520, 205, 0xffffff, -1, -1, 0xcccccc, 0xcccccc);           // As the data can lie outside the plotarea in a zoomed chart, we need to enable clipping.     c->setClipping();       // Add a top title to the chart using 15 pts Times New Roman Bold Italic font, with a light blue     // (ccccff) background, black (000000) border, and a glass like raised effect.     c->addTitle("Simple Zooming and Scrolling", "timesbi.ttf", 15         )->setBackground(0xccccff, 0x0, Chart::glassEffect());       // Add a legend box at the top of the plot area with 9pts Arial Bold font with flow layout.     c->addLegend(50, 33, false, "arialbd.ttf", 9)->setBackground(Chart::Transparent, Chart::Transparent);       // Set axes width to 2 pixels     c->yAxis()->setWidth(2);     c->xAxis()->setWidth(2);       // Add a title to the y-axis     c->yAxis()->setTitle("Price (USD)", "arialbd.ttf", 9);       ///////////////////////////////////////////////////////////////////////////////////////     // Add data to chart     ///////////////////////////////////////////////////////////////////////////////////////       //     // In this example, we represent the data by lines. You may modify the code below to use other     // representations (areas, scatter plot, etc).     //       // Add a line layer for the lines, using a line width of 2 pixels     LineLayer *layer = c->addLineLayer();     layer->setLineWidth(2);       // In this demo, we do not have too many data points. In real code, the chart may contain a lot     // of data points when fully zoomed out - much more than the number of horizontal pixels in this     // plot area. So it is a good idea to use fast line mode.     layer->setFastLineMode();       // Now we add the 3 data series to a line layer, using the color red (ff0000), green     // (00cc00) and blue (0000ff)     layer->setXData(viewPortTimeStamps);     layer->addDataSet(viewPortDataSeriesA, 0xff0000, "Product Alpha");     layer->addDataSet(viewPortDataSeriesB, 0x00cc00, "Product Beta");     layer->addDataSet(viewPortDataSeriesC, 0x0000ff, "Product Gamma");       ///////////////////////////////////////////////////////////////////////////////////////     // Configure axis scale and labelling     ///////////////////////////////////////////////////////////////////////////////////////           // Set the x-axis as a date/time axis with the scale according to the view port x range.     viewer->syncDateAxisWithViewPort("x", c->xAxis());       // In this demo, we rely on ChartDirector to auto-label the axis. We ask ChartDirector to ensure     // the x-axis labels are at least 75 pixels apart to avoid too many labels.     c->xAxis()->setTickDensity(75);       ///////////////////////////////////////////////////////////////////////////////////////     // Output the chart     ///////////////////////////////////////////////////////////////////////////////////////       delete viewer->getChart();     viewer->setChart(c); }   // // Update the image map // void CSimplezoomscrollDlg::updateImageMap(CChartViewer *viewer) {     // Include tool tip for the chart     if (0 == viewer->getImageMapHandler())     {         viewer->setImageMap(viewer->getChart()->getHTMLImageMap("", "",             "title='[{dataSetName}] {x|mmm dd, yyyy}: USD {value|2}'"));     } }   ///////////////////////////////////////////////////////////////////////////// // General utilities   // // Get the default background color // int CSimplezoomscrollDlg::getDefaultBgColor() {     LOGBRUSH LogBrush;     HBRUSH hBrush = (HBRUSH)SendMessage(WM_CTLCOLORDLG, (WPARAM)CClientDC(this).m_hDC,         (LPARAM)m_hWnd);     ::GetObject(hBrush, sizeof(LOGBRUSH), &LogBrush);     int ret = LogBrush.lbColor;     return ((ret & 0xff) << 16) | (ret & 0xff00) | ((ret & 0xff0000) >> 16); }   // // Load an icon resource into a button // void CSimplezoomscrollDlg::loadButtonIcon(int buttonId, int iconId, int width, int height) {     GetDlgItem(buttonId)->SendMessage(BM_SETIMAGE, IMAGE_ICON, (LPARAM)::LoadImage(         AfxGetResourceHandle(), MAKEINTRESOURCE(iconId), IMAGE_ICON, width, height,         LR_DEFAULTCOLOR));  }

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