ChartDirector 7.0 (Java Edition)

Track Box with Floating Legend




This sample program demonstrates a track cursor programmed with the following features:

On the server side, the code draws the chart as usual, and outputs both the image and the Javascript Chart Model of the chart.

The trackBoxLegend Javascript function is the routine that draws the track cursor. Its key elements are:

The trackBoxLegend Javascript function is the routine that draws the track cursor. Its key elements are:

Source Code Listing

[JSP Version] jspdemo/trackbox.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // The data for the bar chart double[] data0 = {100, 125, 245, 147, 67}; double[] data1 = {85, 156, 179, 211, 123}; double[] data2 = {97, 87, 56, 267, 157}; String[] labels = {"Mon", "Tue", "Wed", "Thur", "Fri"}; // Create a XYChart object of size 540 x 375 pixels XYChart c = new XYChart(540, 375); // Add a title to the chart using 18pt Times Bold Italic font c.addTitle("Average Weekly Network Load", "Times New Roman Bold Italic", 18); // Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color from // light blue (f9f9ff) to blue (6666ff) as background. Set border and grid lines to white (ffffff). c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0xf9f9ff, 0x6666ff), -1, 0xffffff, 0xffffff); // Add a legend box at (50, 28) using horizontal layout. Use 10pt Arial Bold as font, with // transparent background. c.addLegend(50, 28, false, "Arial Bold", 10).setBackground(Chart.Transparent); // Set the x axis labels c.xAxis().setLabels(labels); // Draw the ticks between label positions (instead of at label positions) c.xAxis().setTickOffset(0.5); // Set axis label style to 8pt Arial Bold c.xAxis().setLabelStyle("Arial Bold", 8); c.yAxis().setLabelStyle("Arial Bold", 8); // Set axis line width to 2 pixels c.xAxis().setWidth(2); c.yAxis().setWidth(2); // Add axis title c.yAxis().setTitle("Throughput (MBytes Per Hour)"); // Add a multi-bar layer with 3 data sets BarLayer layer = c.addBarLayer2(Chart.Side); layer.addDataSet(data0, 0xff0000, "Server #1"); layer.addDataSet(data1, 0x00ff00, "Server #2"); layer.addDataSet(data2, 0xff8800, "Server #3"); // Set bar border to transparent. Use glass lighting effect with light direction from left. layer.setBorderColor(Chart.Transparent, Chart.glassEffect(Chart.NormalGlare, Chart.Left)); // Configure the bars within a group to touch each others (no gap) layer.setBarGap(0.2, Chart.TouchBar); // Create the WebChartViewer object WebChartViewer viewer = new WebChartViewer(request, "chart1"); // Output the chart viewer.setChart(c, Chart.SVG); // Output Javascript chart model to the browser to support tracking cursor viewer.setChartModel(c.getJsChartModel()); %> <!DOCTYPE html> <html> <head> <title>Track Box with Floating Legend</title> <script type="text/javascript" src="cdjcv.js"></script> </head> <body style="margin:5px 0px 0px 5px"> <script type="text/javascript"> // // Use the window load event to set up the MouseMovePlotArea event handler // JsChartViewer.addEventListener(window, 'load', function() { var viewer = JsChartViewer.get('<%=viewer.getId()%>'); // Draw track cursor when mouse is moving over plotarea. Hide it when mouse leaves plot area. viewer.attachHandler(["MouseMovePlotArea", "TouchStartPlotArea", "TouchMovePlotArea", "ChartMove"], function(e) { this.preventDefault(e); // Prevent the browser from using touch events for other actions trackBoxLegend(viewer, viewer.getPlotAreaMouseX(), viewer.getPlotAreaMouseY()); viewer.setAutoHide("all", ["MouseOutPlotArea", "TouchEndPlotArea"]); }); }); // // Draw track box with legend // function trackBoxLegend(viewer, mouseX, mouseY) { // 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 var xValue = c.getNearestXValue(mouseX); // Compute the position of the box. This example assumes a label based x-axis, in which the labeling spacing // is one x-axis unit. So the left and right sides of the box is 0.5 unit from the central x-value. var boxLeft = Math.min(c.getXCoor(xValue - 0.5), c.getXCoor(xValue + 0.5)); var boxWidth = Math.max(0, Math.abs(c.getXCoor(xValue + 0.5) - c.getXCoor(xValue - 0.5)) - 1); var boxTop = plotArea.getTopY(); var boxHeight = Math.max(0, plotArea.getHeight() - 2); // Draw the track box viewer.showTextBox("trackBox", boxLeft, boxTop, JsChartViewer.TopLeft, "", "width:" + boxWidth + "px;height:" + boxHeight + "px;border:solid 1px black;"); // Array to hold the legend entries var legendEntries = []; // Iterate through all layers to build the legend array 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); // Build the legend entry, consist of a colored square box, the name and the data value. var dataColor = dataSet.getDataColor(); var dataValue = dataSet.getValue(xIndex); if ((dataValue != null) && (dataColor != null)) { legendEntries.push("<nobr>" + viewer.htmlRect(7, 7, dataColor) + " " + dataSet.getDataName() + ": " + dataValue.toPrecision(4) + "</nobr> "); } } } // Create the legend by joining the legend entries if (legendEntries.length > 0) { var legend = "<u>" + c.xAxis().getFormattedLabel(xValue) + "</u><br />" + legendEntries.reverse().join("<br />"); // Display the legend at the bottom-right side of the mouse cursor viewer.showTextBox("legend", mouseX + 16, mouseY + 16, JsChartViewer.TopLeft, legend, "border:solid 1px black;background:#ffffcc;padding:3px;font:bold 11px Arial;-webkit-text-size-adjust:100%;"); } } </script> <div style="font-size:18pt; font-family:verdana; font-weight:bold"> Track Box with Floating Legend </div> <hr style="border:solid 1px #000080" /> <div style="font-size:10pt; font-family:verdana; margin-bottom:1.5em"> <a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a> </div> <!-- ****** Here is the chart image ****** --> <%=viewer.renderHTML(response)%> </body> </html>