I want to show the validity of some contracts. Every contract may be in different versions. The chart works almost, but I have some problems:
- Labels are not aligned with the contract
- The bar width is not sufficient (especially whith chart with more contracts)
- the gab between the contracts is big; the space between the contracts is wasted (should be used for bar width)
I think the reason for this mess is because I populate the dataset in a way the gantt chart doesn't expect.
Code: Select all
package demo;
import java.awt.Paint;
import java.util.Calendar;
import java.util.Date;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.renderer.category.GanttRenderer;
import org.jfree.data.category.IntervalCategoryDataset;
import org.jfree.data.gantt.Task;
import org.jfree.data.gantt.TaskSeries;
import org.jfree.data.gantt.TaskSeriesCollection;
import org.jfree.data.time.SimpleTimePeriod;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
public class GanttDemo3 extends ApplicationFrame {
public GanttDemo3(String title) {
super(title);
JPanel chartPanel = createDemoPanel();
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
setContentPane(chartPanel);
}
/**
* Creates a sample dataset for a Gantt chart.
*
* @return The dataset.
*/
public static IntervalCategoryDataset createDataset() {
TaskSeries s1 = new TaskSeries("1");
s1.add(new Task("Contrakt 1", new SimpleTimePeriod(date(1, Calendar.JANUARY, 2005), date(31, Calendar.JUNE, 2005))));
TaskSeries s2 = new TaskSeries("2");
s2.add(new Task("Contrakt 1", new SimpleTimePeriod(date(1, Calendar.JULY, 2005), date(1, Calendar.FEBRUARY, 2006))));
TaskSeries s3 = new TaskSeries("3");
s3.add(new Task("Contrakt 2", new SimpleTimePeriod(date(1, Calendar.JANUARY, 2005), date(1, Calendar.FEBRUARY, 2006))));
TaskSeries s4 = new TaskSeries("4");
s4.add(new Task("Contrakt 3", new SimpleTimePeriod(date(1, Calendar.JANUARY, 2005), date(1, Calendar.FEBRUARY, 2006))));
TaskSeriesCollection collection = new TaskSeriesCollection();
collection.add(s1);
collection.add(s2);
collection.add(s3);
collection.add(s4);
return collection;
}
/**
* Utility method for creating <code>Date</code> objects.
*
* @param day the date.
* @param month the month.
* @param year the year.
*
* @return a date.
*/
private static Date date(int day, int month, int year) {
Calendar calendar = Calendar.getInstance();
calendar.set(year, month, day);
Date result = calendar.getTime();
return result;
}
/**
* Creates a chart.
*
* @param dataset the dataset.
*
* @return The chart.
*/
private static JFreeChart createChart(IntervalCategoryDataset dataset) {
JFreeChart chart = ChartFactory.createGanttChart("Contract Version Validity Demo", // chart title
"", // domain axis label
null, // range axis label
dataset, // data
false, // include legend
true, // tooltips
false // urls
);
CategoryPlot plot = (CategoryPlot) chart.getPlot();
MyGanttRenderer renderer = new MyGanttRenderer();
plot.setRenderer(renderer);
plot.getDomainAxis().setMaximumCategoryLabelWidthRatio(10.0f);
renderer.setDrawBarOutline(false);
return chart;
}
/**
* Creates a panel for the demo (used by SuperDemo.java).
*
* @return A panel.
*/
public static JPanel createDemoPanel() {
JFreeChart chart = createChart(createDataset());
return new ChartPanel(chart);
}
/**
* Starting point for the demonstration application.
*
* @param args ignored.
*/
public static void main(String[] args) {
GanttDemo3 demo = new GanttDemo3("Gantt Chart Demo 3");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
static class MyGanttRenderer extends GanttRenderer {
public MyGanttRenderer() {
super();
}
public Paint getItemPaint(int row, int column) {
return DefaultDrawingSupplier.DEFAULT_PAINT_SEQUENCE[column];
}
}
}
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