ChartDirector 6.1 (Java Edition)

Background and Wallpaper


      

This example demonstrates some of the background effects supported by ChartDirector.

ChartDirector supports using an image file as the wallpaper of the chart image background with BaseChart.setWallpaper, and as the plot area background with PlotArea.setBackground2.

In addition to wallpapers, ChartDirector supports alternating plot area background colors using PlotArea.setBackground and PlotArea.setAltBgColor.

You can switch the default colors to using a dark background with white lines and text in one step by changing the color palette to a whiteOnBlackPalette using BaseChart.setColors.

Source Code Listing

[JSP Version] jspdemo/background.jsp
<%@page import="ChartDirector.*" %>
<%@page import="javax.servlet.http.*" %>
<%!
// A simple structure to represent a chart image with an image map
private static class ImageWithHotSpot
{
    String imageURL;
    String imageMap;
}

// Function to create the demo charts
ImageWithHotSpot createChart(HttpServletRequest request, int chartIndex)
{
    // The data for the chart
    double[] data = {85, 156, 179.5, 211, 123};
    String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"};

    // Create a XYChart object of size 270 x 270 pixels
    XYChart c = new XYChart(270, 270);

    //Set search path to current JSP directory for loading icon images
    c.setSearchPath(getServletConfig().getServletContext(), request);

    // Set the plot area at (40, 32) and of size 200 x 200 pixels
    PlotArea plotarea = c.setPlotArea(40, 32, 200, 200);

    // Set the background style based on the input parameter
    if (chartIndex == 0) {
        // Has wallpaper image
        c.setWallpaper("tile.gif");
    } else if (chartIndex == 1) {
        // Use a background image as the plot area background
        plotarea.setBackground2("bg.png");
    } else if (chartIndex == 2) {
        // Use white (0xffffff) and grey (0xe0e0e0) as two alternate plotarea background colors
        plotarea.setBackground(0xffffff, 0xe0e0e0);
    } else {
        // Use a dark background palette
        c.setColors(Chart.whiteOnBlackPalette);
    }

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

    // Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
    c.addBarLayer3(data).setBorderColor(-1, 1);

    // Output the chart
    ImageWithHotSpot ret = new ImageWithHotSpot();
    ret.imageURL = c.makeSession(request, "chart" + chartIndex);

    // Include tool tip for the chart
    ret.imageMap = c.getHTMLImageMap("", "", "title='Revenue for {xLabel}: US${value}K'");

    return ret;
}
%>
<%
ImageWithHotSpot chart0 = createChart(request, 0);
ImageWithHotSpot chart1 = createChart(request, 1);
ImageWithHotSpot chart2 = createChart(request, 2);
ImageWithHotSpot chart3 = createChart(request, 3);
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Background and Wallpaper
</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?"+chart0.imageURL)%>'
    usemap="#map0" border="0">
<map name="map0"><%=chart0.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart1.imageURL)%>'
    usemap="#map1" border="0">
<map name="map1"><%=chart1.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart2.imageURL)%>'
    usemap="#map2" border="0">
<map name="map2"><%=chart2.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart3.imageURL)%>'
    usemap="#map3" border="0">
<map name="map3"><%=chart3.imageMap%></map>
</body>
</html>

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

public class background implements DemoModule
{
    //Name of demo program
    public String toString() { return "Background and Wallpaper"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 4; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int chartIndex)
    {
        // The data for the chart
        double[] data = {85, 156, 179.5, 211, 123};
        String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"};

        // Create a XYChart object of size 270 x 270 pixels
        XYChart c = new XYChart(270, 270);

        // Set the plot area at (40, 32) and of size 200 x 200 pixels
        PlotArea plotarea = c.setPlotArea(40, 32, 200, 200);

        // Set the background style based on the input parameter
        if (chartIndex == 0) {
            // Has wallpaper image
            c.setWallpaper("tile.gif");
        } else if (chartIndex == 1) {
            // Use a background image as the plot area background
            plotarea.setBackground2("bg.png");
        } else if (chartIndex == 2) {
            // Use white (0xffffff) and grey (0xe0e0e0) as two alternate plotarea background colors
            plotarea.setBackground(0xffffff, 0xe0e0e0);
        } else {
            // Use a dark background palette
            c.setColors(Chart.whiteOnBlackPalette);
        }

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

        // Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
        c.addBarLayer3(data).setBorderColor(-1, 1);

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

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

    //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 background();

        //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);
        frame.getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT));
        frame.setSize(800, 450);

        // Create the charts and put them in the content pane
        for (int i = 0; i < demo.getNoOfCharts(); ++i)
        {
            ChartViewer viewer = new ChartViewer();
            demo.createChart(viewer, i);
            frame.getContentPane().add(viewer);
        }

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