ChartDirector 6.1 (Java Edition)

Soft Bar Shading




This example demonstrates using soft lighting effect for bars and gradient color for plot area background. It also demonstrates putting axis ticks in between axis labels, as opposed to at the axis labels.

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 Multi-Bar Chart for another example of soft lighting effect with the light coming from the top direction.

Source Code Listing

[JSP Version] jspdemo/softlightbar.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the bar chart
double[] data = {450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700};

// The labels for the bar chart
String[] labels = {"1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005"};

// Create a XYChart object of size 600 x 360 pixels
XYChart c = new XYChart(600, 360);

// Add a title to the chart using 18pt Times Bold Italic font
c.addTitle("Annual Revenue for Star Tech", "Times New Roman Bold Italic", 18);

// Set the plotarea at (60, 40) and of size 500 x 280 pixels. Use a vertical gradient color from
// light blue (eeeeff) to deep blue (0000cc) as background. Set border and grid lines to white
// (ffffff).
c.setPlotArea(60, 40, 500, 280, c.linearGradientColor(60, 40, 60, 280, 0xeeeeff, 0x0000cc), -1,
    0xffffff, 0xffffff);

// Add a multi-color bar chart layer using the supplied data. Use soft lighting effect with light
// direction from left.
c.addBarLayer3(data).setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Left));

// Set x axis labels using the given labels
c.xAxis().setLabels(labels);

// Draw the ticks between label positions (instead of at label positions)
c.xAxis().setTickOffset(0.5);

// Add a title to the y axis with 10pt Arial Bold font
c.yAxis().setTitle("USD (millions)", "Arial Bold", 10);

// 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);

// Output the chart
String chart1URL = c.makeSession(request, "chart1");

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "", "title='Year {xLabel}: US$ {value}M'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Soft Bar Shading
</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/softlightbar.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class softlightbar implements DemoModule
{
    //Name of demo program
    public String toString() { return "Soft Bar Shading"; }

    //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[] data = {450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700};

        // The labels for the bar chart
        String[] labels = {"1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004",
            "2005"};

        // Create a XYChart object of size 600 x 360 pixels
        XYChart c = new XYChart(600, 360);

        // Add a title to the chart using 18pt Times Bold Italic font
        c.addTitle("Annual Revenue for Star Tech", "Times New Roman Bold Italic", 18);

        // Set the plotarea at (60, 40) and of size 500 x 280 pixels. Use a vertical gradient color
        // from light blue (eeeeff) to deep blue (0000cc) as background. Set border and grid lines
        // to white (ffffff).
        c.setPlotArea(60, 40, 500, 280, c.linearGradientColor(60, 40, 60, 280, 0xeeeeff, 0x0000cc),
            -1, 0xffffff, 0xffffff);

        // Add a multi-color bar chart layer using the supplied data. Use soft lighting effect with
        // light direction from left.
        c.addBarLayer3(data).setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Left));

        // Set x axis labels using the given labels
        c.xAxis().setLabels(labels);

        // Draw the ticks between label positions (instead of at label positions)
        c.xAxis().setTickOffset(0.5);

        // Add a title to the y axis with 10pt Arial Bold font
        c.yAxis().setTitle("USD (millions)", "Arial Bold", 10);

        // 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);

        // Output the chart
        viewer.setChart(c);

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "", "title='Year {xLabel}: US$ {value}M'")
            );
    }

    //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 softlightbar();

        //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);
    }
}