ChartDirector 6.1 (Java Edition)

Soft Multi-Bar Chart




This example demonstrates a multi-bar chart with soft lighting effects for bars and gradient color for plot area background.

Soft lighting is a special shading effect that look like gradient coloring. In this example, soft lighting effect is applied to the bars with the light coming from the left direction.

See Soft Bar Shading for another example of soft lighting effect with the light coming from the left direction.

Source Code Listing

[JSP Version] jspdemo/softmultibar.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
// light red (ffdddd) to dark red (880000) as background. Set border and grid lines to white
// (ffffff).
c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0xffdddd, 0x880000), -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, 0xffff00, "Server #1");
layer.addDataSet(data1, 0x00ff00, "Server #2");
layer.addDataSet(data2, 0x9999ff, "Server #3");

// Set bar border to transparent. Use soft lighting effect with light direction from top.
layer.setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Top));

// 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">
    Soft 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/softmultibar.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class softmultibar implements DemoModule
{
    //Name of demo program
    public String toString() { return "Soft 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 light red (ffdddd) to dark red (880000) as background. Set border and grid
        // lines to white (ffffff).
        c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0xffdddd, 0x880000),
            -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, 0xffff00, "Server #1");
        layer.addDataSet(data1, 0x00ff00, "Server #2");
        layer.addDataSet(data2, 0x9999ff, "Server #3");

        // Set bar border to transparent. Use soft lighting effect with light direction from top.
        layer.setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Top));

        // 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 softmultibar();

        //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);
    }
}