Performance problem

[chofi]

Hi,

I'm using JFreeChart 1.0.13 for a research project. I discovered a performance problem while using a large XYTaskDataset in an XYBarChart.

I am trying to make a huge kind of Gantt chart, and if the tasks created have all different descriptions, the chart behaves really slow.

I found a workaround for that, if all the tasks have the same description, it works fine. So I created my own Task class that inherits from Task, and added another field to keep the information I need. Is there a problem if all my tasks have the same description? I played a little bit with the graph and everything seems to work fine, but I am not sure.

Does anybody know why do I have this problem?

Here is the code to create the dataset, containing tasks with the same description.

Thank you.

Regards,

Sofia

createTasks method:

Code: Select all

private TaskSeriesCollection createTasks() {
    TaskSeriesCollection localTaskSeriesCollection = new TaskSeriesCollection();
    TaskSeries localTaskSeries3;
    for (int i = 0; i < 3000; i++) {
      localTaskSeries3 = new TaskSeries("Team" + i);
      Calendar c = GregorianCalendar.getInstance();
      c.setTime(startDate);
      c.setTime(new Date());
      Date start = c.getTime();
      c.add(Calendar.MILLISECOND, 10);
      Date end = c.getTime();
      Task t = new MyTask("T3a"+i, start, end);
      tasks.add(localTaskSeries3);
      localTaskSeries3.add(t);
      c.add(Calendar.MILLISECOND, 10);
      start = c.getTime();
      c.add(Calendar.MILLISECOND, 10);
      end = c.getTime();
      t = new MyTask("T3b"+i, start, end);
      localTaskSeries3.add(t);
      c.add(Calendar.MILLISECOND, 10);
      start = c.getTime();
      c.add(Calendar.MILLISECOND, 10);
      end = c.getTime();
      t = new MyTask("T3c"+i, start, end);
      localTaskSeries3.add(t);
      localTaskSeriesCollection.add(localTaskSeries3);
    }
    return localTaskSeriesCollection;
  }

MyTask class:

Code: Select all

class MyTask extends Task {
    private static final long serialVersionUID = -8059327823133382306L;
    private String name;
    
    public MyTask(String description, Date start, Date end) {
      super("task", start, end);
      this.name = description;
      // TODO Auto-generated constructor stub
    }
    
    public MyTask(String description, TimePeriod duration) {
      super("task", duration);
      this.name = description;
    }
    
    public String getName(){
      return name;
    }
    
    @Override
    public String toString() {
      return super.toString() + " " + name;
    }
    
  }