ChartDirector 7.0 (Java Edition)

Positive Negative Bars




This example demonstrates a bar chart containing positive and negative data, represented by different colors.

In this example, the two colors of the plot area background are configured using background zones, while the bar colors are configured by splitting the bars into two layers.

Source Code Listing

[JSP Version] jspdemo/posnegbar.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // The data for the bar chart double[] data = {-6.3, 2.3, 0.7, -3.4, 2.2, -2.9, -0.1, -0.1, 3.3, 6.2, 4.3, 1.6}; // The labels for the bar chart String[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; // Create a XYChart object of size 500 x 320 pixels XYChart c = new XYChart(500, 320); // Add a title to the chart using Arial Bold Italic font c.addTitle("Productivity Change - Year 2005", "Arial Bold Italic"); // Set the plotarea at (50, 30) and of size 400 x 250 pixels c.setPlotArea(50, 30, 400, 250); // Add a bar layer to the chart using the Overlay data combine method BarLayer layer = c.addBarLayer2(Chart.Overlay); // Select positive data and add it as data set with blue (6666ff) color layer.addDataSet(new ArrayMath(data).selectGEZ(null, Chart.NoValue).result(), 0x6666ff); // Select negative data and add it as data set with orange (ff6600) color layer.addDataSet(new ArrayMath(data).selectLTZ(null, Chart.NoValue).result(), 0xff6600); // Add labels to the top of the bar using 8 pt Arial Bold font. The font color is configured to be // red (0xcc3300) below zero, and blue (0x3333ff) above zero. layer.setAggregateLabelStyle("Arial Bold", 8, layer.yZoneColor(0, 0xcc3300, 0x3333ff)); // Set the labels on the x axis and use Arial Bold as the label font c.xAxis().setLabels(labels).setFontStyle("Arial Bold"); // Draw the y axis on the right of the plot area c.setYAxisOnRight(true); // Use Arial Bold as the y axis label font c.yAxis().setLabelStyle("Arial Bold"); // Add a title to the y axis c.yAxis().setTitle("Percentage"); // Add a light blue (0xccccff) zone for positive part of the plot area c.yAxis().addZone(0, 9999, 0xccccff); // Add a pink (0xffffcc) zone for negative part of the plot area c.yAxis().addZone(-9999, 0, 0xffcccc); // 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='{xLabel}: {value}%'")); %> <!DOCTYPE html> <html> <head> <title>Positive Negative Bars</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;"> Positive Negative Bars </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>