ChartDirector 6.1 (Java Edition)

Rotated Line Chart




This example demonstrates swapping the x and y axes to produce a rotated line chart in which the line goes from top to bottom (instead of left to right).

The x and y axes in the example are configured as follows:

For demo purposes, this example uses RanTable to simulate a database table with 4 columns, in which one is a date/time column and the remaining three are data columns. The date/time column is passed to ChartDirector as the x values using Layer.setXData, while the data columns are passed to ChartDirector as y values using Layer.addDataSet.

Source Code Listing

[JSP Version] jspdemo/rotatedline.jsp
<%@page import="ChartDirector.*" %>
<%@page import="java.util.*" %>
<%
//
//    We use a random table to simulate generating 12 months of data
//

// Create the random table object with 4 cols * 12 rows, using 3 as seed
RanTable rantable = new RanTable(3, 4, 12);

// Set the 1st column to be the 12 months of year 2002
rantable.setDateCol(0, new GregorianCalendar(2002, 0, 1).getTime(), 86400 * 30);

// Set the 2nd, 3rd and 4th columns to be random numbers starting from 125, 75, and 100
// respectively. The change between rows is set to -35 to + 35. The minimum value of any cell is 0.
rantable.setCol(1, 125, -35, 35, 0);
rantable.setCol(2, 75, -35, 35, 0);
rantable.setCol(3, 100, -35, 35, 0);

// Get the 1st column (time) as the x data
double[] dataX = rantable.getCol(0);

// Get the 2nd, 3rd and 4th columns as 3 data sets
double[] dataY0 = rantable.getCol(1);
double[] dataY1 = rantable.getCol(2);
double[] dataY2 = rantable.getCol(3);

// Create a XYChart object of size 360 x 400 pixels
XYChart c = new XYChart(360, 400);

// Add a title to the chart
c.addTitle("<*underline=2*>Rotated Line Chart Demo", "Times New Roman Bold Italic", 14);

// Set the plotarea at (60, 75) and of size 190 x 320 pixels. Turn on both horizontal and vertical
// grid lines with light grey color (0xc0c0c0)
c.setPlotArea(60, 75, 190, 320).setGridColor(0xc0c0c0, 0xc0c0c0);

// Add a legend box at (270, 75)
c.addLegend(270, 75);

// Swap the x and y axis to become a rotated chart
c.swapXY();

// Set the y axis on the top side (right + rotated = top)
c.setYAxisOnRight();

// Add a title to the y axis
c.yAxis().setTitle("Throughput (MBytes)");

// Reverse the x axis so it is pointing downwards
c.xAxis().setReverse();

// Add a line chart layer using the given data
LineLayer layer = c.addLineLayer2();
layer.setXData(dataX);
layer.addDataSet(dataY0, 0xff0000, "Server A");
layer.addDataSet(dataY1, 0x338033, "Server B");
layer.addDataSet(dataY2, 0x0000ff, "Server C");

// Set the line width to 2 pixels
layer.setLineWidth(2);

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

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "", "title='[{dataSetName}] {x|mm/yyyy}: {value|0} MByte'")
    ;
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Rotated Line 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/rotatedline.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import ChartDirector.*;

public class rotatedline implements DemoModule
{
    //Name of demo program
    public String toString() { return "Rotated Line 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)
    {
        //
        //    We use a random table to simulate generating 12 months of data
        //

        // Create the random table object with 4 cols * 12 rows, using 3 as seed
        RanTable rantable = new RanTable(3, 4, 12);

        // Set the 1st column to be the 12 months of year 2002
        rantable.setDateCol(0, new GregorianCalendar(2002, 0, 1).getTime(), 86400 * 30);

        // Set the 2nd, 3rd and 4th columns to be random numbers starting from 125, 75, and 100
        // respectively. The change between rows is set to -35 to + 35. The minimum value of any
        // cell is 0.
        rantable.setCol(1, 125, -35, 35, 0);
        rantable.setCol(2, 75, -35, 35, 0);
        rantable.setCol(3, 100, -35, 35, 0);

        // Get the 1st column (time) as the x data
        double[] dataX = rantable.getCol(0);

        // Get the 2nd, 3rd and 4th columns as 3 data sets
        double[] dataY0 = rantable.getCol(1);
        double[] dataY1 = rantable.getCol(2);
        double[] dataY2 = rantable.getCol(3);

        // Create a XYChart object of size 360 x 400 pixels
        XYChart c = new XYChart(360, 400);

        // Add a title to the chart
        c.addTitle("<*underline=2*>Rotated Line Chart Demo", "Times New Roman Bold Italic", 14);

        // Set the plotarea at (60, 75) and of size 190 x 320 pixels. Turn on both horizontal and
        // vertical grid lines with light grey color (0xc0c0c0)
        c.setPlotArea(60, 75, 190, 320).setGridColor(0xc0c0c0, 0xc0c0c0);

        // Add a legend box at (270, 75)
        c.addLegend(270, 75);

        // Swap the x and y axis to become a rotated chart
        c.swapXY();

        // Set the y axis on the top side (right + rotated = top)
        c.setYAxisOnRight();

        // Add a title to the y axis
        c.yAxis().setTitle("Throughput (MBytes)");

        // Reverse the x axis so it is pointing downwards
        c.xAxis().setReverse();

        // Add a line chart layer using the given data
        LineLayer layer = c.addLineLayer2();
        layer.setXData(dataX);
        layer.addDataSet(dataY0, 0xff0000, "Server A");
        layer.addDataSet(dataY1, 0x338033, "Server B");
        layer.addDataSet(dataY2, 0x0000ff, "Server C");

        // Set the line width to 2 pixels
        layer.setLineWidth(2);

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

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='[{dataSetName}] {x|mm/yyyy}: {value|0} MByte'"));
    }

    //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 rotatedline();

        //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);
    }
}