ChartDirector 7.0 (Java Edition)

Zoom/Scroll with PDF Report




This example is modified from Zooming and Scrolling with Track Line to demonstrate creating a PDF report with multiple charts covering the entire data range.

This example adds two buttons to the web page to download the visible chart image and the complete PDF report. These buttons use JsChartViewer.partialUpdateAsAttachment to generate the download attachment requests.

The code on the server side needs to handle 4 kinds of requests:

MultiPagePDF works by generating a PDF page for chart added to it. The chart can be a MultiChart, and can contain free form CDML text, tables, shape and images. In this way, MultiPagePDF can create complete PDF reports.

In this example, the PDF report is generated as follows:

Source Code Listing

[JSP Version] jspdemo/zoomscrollpdf.jsp
<%@page import="ChartDirector.*, java.util.*" %> <%! // // Create a random table for demo purpose. // private RanTable getRanTable() { RanTable r = new RanTable(127, 4, 1827); r.setDateCol(0, new GregorianCalendar(2015, 0, 1).getTime(), 86400); r.setCol(1, 150, -10, 10); r.setCol(2, 200, -10, 10); r.setCol(3, 250, -8, 8); return r; } // // Initialize the WebChartViewer when the page is first loaded // private void initViewer(WebChartViewer viewer) { // The full x-axis range is from Jan 1, 2007 to Jan 1, 2012 Date startDate = new GregorianCalendar(2015, 0, 1).getTime(); Date endDate = new GregorianCalendar(2020, 0, 1).getTime(); viewer.setFullRange("x", startDate, endDate); // Initialize the view port to show the last 366 days (out of 1827 days) viewer.setViewPortWidth(366.0 / 1827); viewer.setViewPortLeft(1 - viewer.getViewPortWidth()); // Set the maximum zoom to 10 days (out of 1827 days) viewer.setZoomInWidthLimit(10.0 / 1827); } // // Draw an XYChart using data from startX to endX // private XYChart drawXYChart(Date startX, Date endX) { // Obtain the random data table RanTable r = getRanTable(); // Select the data for the visible date range startDate to endDate. It is possible there is no // data point at exactly startDate or endDate. In this case, we also need the data points that // are just outside the visible date range to "overdraw" the line a little bit (the "overdrawn" // part will be clipped to the plot area) In this demo, we do this by adding a one day margin to // the date range when selecting the data. The selected data from the random data table Date[] timeStamps = Chart.NTime(r.getCol(0)); double[] dataSeriesA = r.getCol(1); double[] dataSeriesB = r.getCol(2); double[] dataSeriesC = r.getCol(3); // // 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 of size 640 x 350 pixels XYChart c = new XYChart(640, 350); // Set the plotarea at (55, 50) with width 80 pixels less than chart width, and height 85 pixels // less than chart height. Use a vertical gradient from light blue (f0f6ff) to sky blue (a0c0ff) // as background. Set border to transparent and grid lines to white (ffffff). c.setPlotArea(55, 50, c.getWidth() - 80, c.getHeight() - 85, c.linearGradientColor(0, 50, 0, c.getHeight() - 35, 0xf0f6ff, 0xa0c0ff), -1, Chart.Transparent, 0xffffff, 0xffffff); // As the data can lie outside the plotarea in a zoomed chart, we need enable clipping. c.setClipping(); // Add a legend box at (55, 25) using horizontal layout. Use 8pts Arial Bold as font. Set the // background and border color to Transparent and use line style legend key. LegendBox b = c.addLegend(55, 25, false, "Arial Bold", 8); b.setBackground(Chart.Transparent); b.setLineStyleKey(); // Set the axis stem to transparent c.xAxis().setColors(Chart.Transparent); c.yAxis().setColors(Chart.Transparent); // Add axis title using 10pts Arial Bold Italic font c.yAxis().setTitle("Ionic Temperature (C)", "Arial Bold Italic", 10); //================================================================================ // 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.addLineLayer2(); 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 (ff33333), green (008800) // and blue (3333cc) layer.setXData(timeStamps); layer.addDataSet(dataSeriesA, 0xff3333, "Alpha"); layer.addDataSet(dataSeriesB, 0x008800, "Beta"); layer.addDataSet(dataSeriesC, 0x3333cc, "Gamma"); //================================================================================ // Configure axis scale and labelling //================================================================================ // Set the x-axis scale c.xAxis().setDateScale(startX, endX); // // In this demo, the time range can be from a few years to a few days. We demonstrate how to set // up different date/time format based on the time range. // // If all ticks are yearly aligned, then we use "yyyy" as the label format. c.xAxis().setFormatCondition("align", 360 * 86400); c.xAxis().setLabelFormat("{value|yyyy}"); // If all ticks are monthly aligned, then we use "mmm yyyy" in bold font as the first label of a // year, and "mmm" for other labels. c.xAxis().setFormatCondition("align", 30 * 86400); c.xAxis().setMultiFormat(Chart.StartOfYearFilter(), "<*font=bold*>{value|mmm yyyy}", Chart.AllPassFilter(), "{value|mmm}"); // If all ticks are daily algined, then we use "mmm dd<*br*>yyyy" in bold font as the first // label of a year, and "mmm dd" in bold font as the first label of a month, and "dd" for other // labels. c.xAxis().setFormatCondition("align", 86400); c.xAxis().setMultiFormat(Chart.StartOfYearFilter(), "<*block,halign=left*><*font=bold*>{value|mmm dd<*br*>yyyy}", Chart.StartOfMonthFilter(), "<*font=bold*>{value|mmm dd}"); c.xAxis().setMultiFormat2(Chart.AllPassFilter(), "{value|dd}"); // For all other cases (sub-daily ticks), use "hh:nn<*br*>mmm dd" for the first label of a day, // and "hh:nn" for other labels. c.xAxis().setFormatCondition("else"); c.xAxis().setMultiFormat(Chart.StartOfDayFilter(), "<*font=bold*>{value|hh:nn<*br*>mmm dd}", Chart.AllPassFilter(), "{value|hh:nn}"); return c; } // // Draw the chart // private void drawChart(WebChartViewer viewer) { // Determine the visible x-axis range Date viewPortStartDate = Chart.NTime(viewer.getValueAtViewPort("x", viewer.getViewPortLeft())); Date viewPortEndDate = Chart.NTime(viewer.getValueAtViewPort("x", viewer.getViewPortRight())); // Draw the XYChart XYChart c = drawXYChart(viewPortStartDate, viewPortEndDate); // Add a title to the chart using 18 pts Times New Roman Bold Italic font c.addTitle(" PDF Report Demonstration", "Times New Roman Bold Italic", 18); if (viewer.isAttachmentRequest()) { // Output as PNG attachment viewer.setChart(c, Chart.PNG); } else { // Output the chart viewer.setChart(c, Chart.SVG); // Output Javascript chart model to the browser to support tracking cursor viewer.setChartModel(c.getJsChartModel()); } } // // Create a multi-page PDF Report // private byte[] createPdfReport(WebChartViewer viewer) { // The MultiPagePDF object can create PDF from multiple pages, each with one chart object. Since // a chart object can contain text (eg. using BaseChart.addText) and other charts (eg. using // MultiChart), that means each page can contain text and multiple charts. MultiPagePDF doc = new MultiPagePDF(); // Page configuration - A4 = 210 x 297mm. The PDF default is 96 dpi (dot per inch), so the A4 // size is equal to 794 x 1123 dots. String pageConfig = "pagewidth = 794; pageheight = 1123"; // In this example, we include a cover page with only text. This is by creating an empty pie // chart with text only. PieChart firstPage = new PieChart(720, 960); firstPage.addText(360, 320, "<*size=50*>ChartDirector<*br*><*size=30*>PDF Report Demonstration<*/*>", "Arial Bold", 30, 0x000000, Chart.Center); firstPage.setOutputOptions(pageConfig); doc.addPage(firstPage); // We include 2 charts per page, with each chart showing one year of data. Each page will also // have a header and page number int startYear = Chart.JCalendar(viewer.getValueAtViewPort("x", 0)).get(Calendar.YEAR); int endYear = Chart.JCalendar(viewer.getValueAtViewPort("x", 1) - 1).get(Calendar.YEAR); int pageNumber = 0; for(int yyyy = startYear; yyyy < endYear + 1; yyyy += 2) { // This chart is the page. MultiChart m = new MultiChart(760, 920); // Use addTitle to add a header m.addTitle("ChartDirector PDF Report Demonstration", "Arial Bold", 20); // Create the first chart XYChart c = drawXYChart(new GregorianCalendar(yyyy, 0, 1).getTime(), new GregorianCalendar( yyyy + 1, 0, 1).getTime()); m.addChart((m.getWidth() - c.getWidth()) / 2, 100, c); c.addTitle("Year " + yyyy); XYChart c2 = null; if (yyyy < endYear) { // Create the second chart c2 = drawXYChart(new GregorianCalendar(yyyy + 1, 0, 1).getTime(), new GregorianCalendar( yyyy + 2, 0, 1).getTime()); c2.addTitle("Year " + (yyyy + 1)); m.addChart((m.getWidth() - c2.getWidth()) / 2, 500, c2); } // Add the page number pageNumber = pageNumber + 1; m.addTitle(Chart.BottomCenter, String.valueOf(pageNumber), "Arial Bold", 8); m.setOutputOptions(pageConfig); doc.addPage(m); } // Output the PDF report return doc.outPDF2(); } %> <% // Create the WebChartViewer object WebChartViewer viewer = new WebChartViewer(request, "chart1"); if (viewer.isPartialUpdateRequest()) { // Is a partial update request. out.clear(); if ("report".equals(request.getParameter("download"))) { // Download PDF report viewer.streamChart(response, createPdfReport(viewer), "chartdirector_report.pdf", true); return; } // Draw the chart and perform a partial response. drawChart(viewer); viewer.partialUpdateChart(response); return; } // // If the code reaches here, it is a full page request. // // In this exapmle, we just need to initialize the WebChartViewer and draw the chart. initViewer(viewer); drawChart(viewer); %> <!DOCTYPE html> <html> <head> <title>PDF Report Demonstration</title> <script type="text/javascript" src="cdjcv.js"></script> <style type="text/css"> .chartButton { font:12px Verdana; border-bottom:#000000 1px solid; padding:5px; cursor:pointer;} .chartButtonSpacer { font:12px Verdana; border-bottom:#000000 1px solid; padding:5px;} .chartButton:hover { box-shadow:inset 0px 0px 0px 2px #444488; } .chartButtonPressed { background-color: #CCFFCC; } </style> </head> <body style="margin:0px;"> <script type="text/javascript"> // // Execute the following initialization code after the web page is loaded // JsChartViewer.addEventListener(window, 'load', function() { // Update the chart when the view port has changed (eg. when the user zooms in using the mouse) var viewer = JsChartViewer.get('<%=viewer.getId()%>'); viewer.attachHandler("ViewPortChanged", viewer.partialUpdate); // Draw track cursor when mouse is moving over plotarea. Hide it when mouse leaves plot area. viewer.attachHandler(["MouseMovePlotArea", "TouchStartPlotArea", "TouchMovePlotArea", "PostUpdate", "ChartMove"], function(e) { this.preventDefault(e); // Prevent the browser from using touch events for other actions trackLineLabel(viewer, viewer.getPlotAreaMouseX()); viewer.setAutoHide("all", ["MouseOutPlotArea", "TouchEndPlotArea"]); }); }); // // Draw track line with data labels // function trackLineLabel(viewer, mouseX) { // Remove all previously drawn tracking object viewer.hideObj("all"); // The chart and its plot area var c = viewer.getChart(); var plotArea = c.getPlotArea(); // Get the data x-value that is nearest to the mouse, and find its pixel coordinate. var xValue = c.getNearestXValue(mouseX); var xCoor = c.getXCoor(xValue); // Draw a vertical track line at the x-position viewer.drawVLine("trackLine", xCoor, plotArea.getTopY(), plotArea.getBottomY(), "black 1px dotted"); // Draw a label on the x-axis to show the track line position viewer.showTextBox("xAxisLabel", xCoor, plotArea.getBottomY() + 4, JsChartViewer.Top, c.xAxis().getFormattedLabel(xValue, "mmm dd, yyyy"), "font:bold 11px Arial;color:#FFFFFF;background-color:#000000;padding:0px 3px"); // Iterate through all layers to draw the data labels for (var i = 0; i < c.getLayerCount(); ++i) { var layer = c.getLayerByZ(i); // The data array index of the x-value var xIndex = layer.getXIndexOf(xValue); // Iterate through all the data sets in the layer for (var j = 0; j < layer.getDataSetCount(); ++j) { var dataSet = layer.getDataSetByZ(j); // Get the color and position of the data label var color = dataSet.getDataColor(); var yCoor = c.getYCoor(dataSet.getPosition(xIndex), dataSet.getUseYAxis()); // Draw a track dot with a label next to it for visible data points in the plot area if ((yCoor != null) && (yCoor >= plotArea.getTopY()) && (yCoor <= plotArea.getBottomY()) && (color != null)) { viewer.showTextBox("dataPoint" + i + "_" + j, xCoor, yCoor, JsChartViewer.Center, viewer.htmlRect(7, 7, color)); viewer.showTextBox("dataLabel" + i + "_" + j, xCoor + 5, yCoor, JsChartViewer.Left, dataSet.getValue(xIndex).toPrecision(4), "padding:0px 3px;font:bold 11px Arial;" + "background-color:" + color + ";color:#FFFFFF;-webkit-text-size-adjust:100%;"); } } } } // // This method is called when the user clicks on the Pointer, Zoom In or Zoom Out buttons // function setMouseMode(mode) { var viewer = JsChartViewer.get('<%=viewer.getId()%>'); if (mode == viewer.getMouseUsage()) mode = JsChartViewer.Default; // Set the button color based on the selected mouse mode document.getElementById("scrollButton").className = "chartButton" + ((mode == JsChartViewer.Scroll) ? " chartButtonPressed" : ""); document.getElementById("zoomInButton").className = "chartButton" + ((mode == JsChartViewer.ZoomIn) ? " chartButtonPressed" : ""); document.getElementById("zoomOutButton").className = "chartButton" + ((mode == JsChartViewer.ZoomOut) ? " chartButtonPressed" : ""); // Set the mouse mode viewer.setMouseUsage(mode); } </script> <form method="post" id="ZoomScrollPDF" runat="server"> <table cellspacing="0" cellpadding="0" style="border:black 1px solid;"> <tr> <td align="right" colspan="2" style="background:#000088; color:#ffff00; padding:0px 4px 2px 0px;"> <a style="color:#FFFF00; font:italic bold 10pt Arial; text-decoration:none" href="http://www.advsofteng.com/"> Advanced Software Engineering </a> </td> </tr> <tr valign="top"> <td style="width:130px; background:#c0c0ff;"> <div style="width:130px"> <!-- The following table is to create 3 cells for 3 buttons to control the mouse usage mode. --> <table style="width:100%; padding:0px; border:0px; border-spacing:0px;"> <tr> <td class="chartButton" id="scrollButton" onclick="setMouseMode(JsChartViewer.Scroll)" ontouchstart="this.onclick(event); event.preventDefault();"> <img src="scrollew.gif" style="vertical-align:middle" alt="Drag" />&nbsp;&nbsp;Drag to Scroll </td> </tr> <tr> <td class="chartButton" id="zoomInButton" onclick="setMouseMode(JsChartViewer.ZoomIn)" ontouchstart="this.onclick(event); event.preventDefault();"> <img src="zoomInIcon.gif" style="vertical-align:middle" alt="Zoom In" />&nbsp;&nbsp;Zoom In </td> </tr> <tr> <td class="chartButton" id="zoomOutButton" onclick="setMouseMode(JsChartViewer.ZoomOut)" ontouchstart="this.onclick(event); event.preventDefault();"> <img src="zoomOutIcon.gif" style="vertical-align:middle" alt="Zoom Out" />&nbsp;&nbsp;Zoom Out </td> </tr> </table> <div style="margin-top:30px; text-align:center"> <input type="button" value="Download Chart" style="width:100%;height:2em" onclick="JsChartViewer.get('<%=viewer.getId()%>').partialUpdateAsAttachment('download=chart');" /> <input type="button" value="PDF Report" style="margin-top:5px; width:100%;height:2em" onclick="JsChartViewer.get('<%=viewer.getId()%>').partialUpdateAsAttachment('download=report');" /> </div> </div> </td> <td style="border-left:black 1px solid; padding:10px 5px 0px 5px;"> <!-- ****** Here is the chart image ****** --> <%=viewer.renderHTML(response)%> </td> </tr> </table> </form> </body> </html>