ChartDirector 7.0 (Java Edition)

Gradient Multi-Bar Chart




This example demonstrates a multi-bar chart with bar gradient shading and gradient color for plot area background.

Source Code Listing

[JSP Version] jspdemo/gradientmultibar.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 // grey (888888) to black (000000) as background. Set border and grid lines to white (ffffff). c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0x888888, 0x000000), -1, 0xffffff, 0xffffff); // Add a legend box at (50, 25) using horizontal layout. Use 10pt Arial Bold as font, with // transparent background. c.addLegend(50, 25, 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 and 4 pixels 3D depth BarLayer layer = c.addBarLayer2(Chart.Side, 4); layer.addDataSet(data0, 0x66aaee, "Server #1"); layer.addDataSet(data1, 0xeebb22, "Server #2"); layer.addDataSet(data2, 0xcc0000, "Server #3"); // Set bar border to transparent. Use bar gradient lighting with light intensity from 0.75 to 1.75. layer.setBorderColor(Chart.Transparent, Chart.barLighting(0.75, 1.75)); // Configure the bars within a group to touch each others (no gap) layer.setBarGap(0.2, Chart.TouchBar); // 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} on {xLabel}: {value} MBytes/hour'")); %> <!DOCTYPE html> <html> <head> <title>Gradient Multi-Bar 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;"> Gradient Multi-Bar 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>