ChartDirector 7.0 (Java Edition)

Rotated Line Chart




This example demonstrates swapping the x and y axes to produce a rotated line chart in which the line goes from top to bottom (instead of left to right).

The x and y axes in the example are configured as follows:

For demo purposes, this example uses RanTable to simulate a database table with 4 columns, in which one is a date/time column and the remaining three are data columns. The date/time column is passed to ChartDirector as the x values using Layer.setXData, while the data columns are passed to ChartDirector as y values using Layer.addDataSet.

Source Code Listing

[JSP Version] jspdemo/rotatedline.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // // We use a random table to simulate generating 12 months of data // // Create the random table object with 4 cols * 12 rows, using 3 as seed RanTable rantable = new RanTable(3, 4, 12); // Set the 1st column to be the 12 months of year 2002 rantable.setDateCol(0, new GregorianCalendar(2002, 0, 1).getTime(), 86400 * 30); // Set the 2nd, 3rd and 4th columns to be random numbers starting from 125, 75, and 100 // respectively. The change between rows is set to -35 to + 35. The minimum value of any cell is 0. rantable.setCol(1, 125, -35, 35, 0); rantable.setCol(2, 75, -35, 35, 0); rantable.setCol(3, 100, -35, 35, 0); // Get the 1st column (time) as the x data double[] dataX = rantable.getCol(0); // Get the 2nd, 3rd and 4th columns as 3 data sets double[] dataY0 = rantable.getCol(1); double[] dataY1 = rantable.getCol(2); double[] dataY2 = rantable.getCol(3); // Create a XYChart object of size 360 x 400 pixels XYChart c = new XYChart(360, 400); // Add a title to the chart c.addTitle("<*underline=2*>Rotated Line Chart Demo", "Times New Roman Bold Italic", 14); // Set the plotarea at (60, 75) and of size 190 x 320 pixels. Turn on both horizontal and vertical // grid lines with light grey color (0xc0c0c0) c.setPlotArea(60, 75, 190, 320).setGridColor(0xc0c0c0, 0xc0c0c0); // Add a legend box at (270, 75) c.addLegend(270, 75); // Swap the x and y axis to become a rotated chart c.swapXY(); // Set the y axis on the top side (right + rotated = top) c.setYAxisOnRight(); // Add a title to the y axis c.yAxis().setTitle("Throughput (MBytes)"); // Reverse the x axis so it is pointing downwards c.xAxis().setReverse(); // Add a line chart layer using the given data LineLayer layer = c.addLineLayer2(); layer.setXData(dataX); layer.addDataSet(dataY0, 0xff0000, "Server A"); layer.addDataSet(dataY1, 0x338033, "Server B"); layer.addDataSet(dataY2, 0x0000ff, "Server C"); // Set the line width to 2 pixels layer.setLineWidth(2); // Output the chart WebChartViewer viewer = new WebChartViewer(request, "chart1"); viewer.setChart(c, Chart.SVG); // Include tool tip for the chart viewer.setImageMap(c.getHTMLImageMap("", "", "title='[{dataSetName}] {x|mm/yyyy}: {value|0} MByte'") ); %> <!DOCTYPE html> <html> <head> <title>Rotated Line Chart</title> <!-- Include ChartDirector Javascript Library to support chart interactions --> <script type="text/javascript" src="cdjcv.js"></script> </head> <body style="margin:5px 0px 0px 5px"> <div style="font:bold 18pt verdana;"> Rotated Line Chart </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt 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>