1

我需要更改甘特图中子任务的颜色。我的示例基于GanttDemo2以下数据集和渲染器。在不同的论坛中，我发现了一些与该主题相关的讨论，但我没有找到一个清晰简单的工作示例。特别是我可以更改任务的颜色，但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);
        }
    }
}
4

2 回答 2

4

正如这里所建议的，自定义渲染器可以查询模型以调节getItemPaint(). 在此示例中，子任务是使用给定系列的默认颜色的不同饱和度的调色板呈现的。该方法假设渲染器进行两次传递；应该注意记录依赖关系。

甘特图子任务演示

/** @see https://stackoverflow.com/questions/8938690 */
private static class MyRenderer extends GanttRenderer {

    private static final int PASS = 2; // assumes two passes
    private final List<Color> clut = new ArrayList<Color>();
    private final TaskSeriesCollection model;
    private int row;
    private int col;
    private int index;

    public MyRenderer(TaskSeriesCollection model) {
        this.model = model;
    }

    @Override
    public Paint getItemPaint(int row, int col) {
        if (clut.isEmpty() || this.row != row || this.col != col) {
            initClut(row, col);
            this.row = row;
            this.col = col;
            index = 0;
        }
        int clutIndex = index++ / PASS;
        return clut.get(clutIndex);
    }

    private void initClut(int row, int col) {
        clut.clear();
        Color c = (Color) super.getItemPaint(row, col);
        float[] a = new float[3];
        Color.RGBtoHSB(c.getRed(), c.getGreen(), c.getBlue(), a);
        TaskSeries series = (TaskSeries) model.getRowKeys().get(row);
        List<Task> tasks = series.getTasks(); // unchecked
        int taskCount = tasks.get(col).getSubtaskCount();
        taskCount = Math.max(1, taskCount);
        for (int i = 0; i < taskCount; i++) {
            clut.add(Color.getHSBColor(a[0], a[1] / i, a[2]));
        }
    }
}
于 2012-01-21T01:17:04.097 回答
0

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 的变化更有弹性。

于 2013-08-05T23:46:34.547 回答