更改甘特图中子任务颜色的代码

Question

我需要更改甘特图中的子任务的颜色。我的示例基于GanttDemo2以下数据集和渲染器。在不同的论坛上，我找到了与该主题相关的一些讨论，但没有找到一个清晰的简单工作示例。特别是，我可以更改任务的颜色，但是我不知道如何提取子任务。private IntervalCategoryDataset createSampleDataset() {    final TaskSeries s1 = new TaskSeries("Scheduled");    final Task t1 = new Task(        "Design", date(1, Calendar.APRIL, 2001), date(1, Calendar.MAY, 2001));    t1.addSubtask(new Task("Design 1", date(1, Calendar.APRIL, 2001), date(15, Calendar.APRIL, 2001)));    t1.addSubtask(new Task("Design 2", date(16, Calendar.APRIL, 2001), date(25, Calendar.APRIL, 2001)));    t1.addSubtask(new Task("Design 3", date(26, Calendar.APRIL, 2001), date(1, Calendar.MAY, 2001)));    s1.add(t1);    final Task t2 = new Task(        "Proposal", date(1, Calendar.JUNE, 2001), date(1, Calendar.JULY, 2001));    t2.addSubtask(new Task("Proposal 1", date(1, Calendar.JUNE, 2001), date(15, Calendar.JUNE, 2001)));    t2.addSubtask(new Task("Proposal 2", date(16, Calendar.JUNE, 2001), date(25, Calendar.JUNE, 2001)));    t2.addSubtask(new Task("Proposal 3", date(26, Calendar.JUNE, 2001), date(1, Calendar.JULY, 2001)));    s1.add(t2);    final TaskSeriesCollection collection = new TaskSeriesCollection();    collection.add(s1);    return collection;}class MyRenderer extends GanttRenderer {    private static final Color subtask1Color = Color.blue;    private static final Color subtask2Color = Color.cyan;    private static final Color subtask3Color = Color.green;    private static final long serialVersionUID = 1L;    public MyRenderer() {        super();    }    @Override    public Paint getItemPaint(int row, int col) {        System.out.println(row + " " + col + " " + super.getItemPaint(row, col));        if (row == 0) {            return subtask1Color;        } else if (row == 1) {            return subtask2Color;        } else if (row == 2) {            return subtask3Color;        } else {            return super.getItemPaint(row, col);        }    }}

Answer 1

或者，您可以扩展任务并使用线程局部变量来跟踪渲染器访问的最后一项：

private ThreadLocal<Integer> lastSubTask = new ThreadLocal<Integer>();

...

private class MyTask extends Task {

    ...

    public Task getSubtask(int index) {

        lastSubTask.set(index);

        return super.getSubtask(index);

    }

}

...

private class MyRenderer extends GanttRenderer {

    ...

    public Paint getCompletePaint() {

        Integer index = lastSubTask.get();

        return getColorForSubTask(index);

    }

    ...

}

这可能对jfreechart的更改更具弹性。