更改甘特图中子任务颜色的代码 [英] Code for changing the color of subtasks in Gantt Chart
问题描述
我需要更改 甘特图.我的示例基于 GanttDemo2
与以下数据集和渲染器.在不同的论坛中,我发现了一些与此主题相关的讨论,但我没有找到一个清晰的工作示例.特别是我可以改变任务的颜色,但我不知道如何提取子任务.
I need to change the color of subtasks in a Gantt chart. My example is based on GanttDemo2
with the following dataset and renderer. In different forums I found some discussions related to this topic, but I did not find a clear simple working example. In particular, I can change the color of tasks, but I don't know how to extract subtasks.
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);
}
}
}
推荐答案
按照这里的建议,自定义渲染器可以查询用于调节 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;应该注意记录依赖项.
As suggested here, a custom renderer can query the model to condition the result returned by getItemPaint()
. In this example, subtasks are rendered using a palette of varying saturations of the default color for a given series. The approach assumes that the renderer makes two passes; some care should be given to documenting the dependency.
/** @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]));
}
}
}
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