ChartDirector 6.1 (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.*" %>
<%
// 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
String chart1URL = c.makeSession(request, "chart1");

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "",
    "title='{dataSetName} on {xLabel}: {value} MBytes/hour'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Gradient Multi-Bar Chart
</div>
<hr color="#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>
<img src='<%=response.encodeURL("getchart.jsp?"+chart1URL)%>'
    usemap="#map1" border="0">
<map name="map1"><%=imageMap1%></map>
</body>
</html>

[Java Version] javademo/gradientmultibar.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class gradientmultibar implements DemoModule
{
    //Name of demo program
    public String toString() { return "Gradient Multi-Bar Chart"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 1; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int chartIndex)
    {
        // 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
        viewer.setChart(c);

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='{dataSetName} on {xLabel}: {value} MBytes/hour'"));
    }

    //Allow this module to run as standalone program for easy testing
    public static void main(String[] args)
    {
        //Instantiate an instance of this demo module
        DemoModule demo = new gradientmultibar();

        //Create and set up the main window
        JFrame frame = new JFrame(demo.toString());
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);} });
        frame.getContentPane().setBackground(Color.white);

        // Create the chart and put them in the content pane
        ChartViewer viewer = new ChartViewer();
        demo.createChart(viewer, 0);
        frame.getContentPane().add(viewer);

        // Display the window
        frame.pack();
        frame.setVisible(true);
    }
}