【发布时间】:2013-12-23 20:21:05
【问题描述】:
一些背景信息:我正在创建一个系统来登记丢失、找到和退回的行李。这 3 个变量的数量需要在 LineChart 中,以便从一段时间内丢失的行李数量等方面获得一个很好的概览。
现在的问题:
当我创建 LineChart 并将其添加到 ChartPanel 时,LineChart 代表一个数据集。我听说当您编辑/更新数据集时,图表也会自动更新。好吧,我在图表旁边有一个更新按钮,单击它时必须更新图表。独立于已经存在的JPanel/ChartPanel 中的图表,我还创建了一个代表ChartFrame 的新框架。
当我单击更新按钮时,会弹出一个新框架,其中包含更新数据集中的最新数据。当我再次单击它时,显然会创建另一个框架,但已经存在的框架也会更新,而 JPanel 中的图表不是虽然他们使用相同的数据集 static 并且来自 LineChart 模型。
这里有一些代码:
LineChartModel
//At the top of the document the dataset is initialize static
public static DefaultCategoryDataset dataset = null;
/*****************Other code omitted***********************/
/**
*
* Updates an already existing dataset
*
* @param dataset
* @return dataset
*/
public CategoryDataset updateDataset(DefaultCategoryDataset dataset) {
this.dataset = dataset;
// row keys...
final String rowLost = "Lost";
final String rowFound = "Found";
final String rowReturned = "Returned";
//Don't pay attention to this. It's setting the value for the dataset from different arrays which I know of the are filled correctly
int i = 0;
while (i < 12) {
dataset.setValue(lost[i], rowLost, type[i]);
System.out.println("There were " + lost[i]
+ " lost luggages in month: " + type[i]);
i++;
}
for (int j = 0; j < 12; j++) {
dataset.setValue(found[j], rowFound, type[j]);
System.out.println("There were " + found[j]
+ " found luggages in month: " + type[j]);
}
for (int j = 0; j < 12; j++) {
dataset.setValue(returned[j], rowReturned, type[j]);
System.out.println("There were " + returned[j]
+ " returned luggages in month: " + type[j]);
}
return dataset;
}
LineChart 类及其构造函数
LineChartModel model = new LineChartModel();
public ChartPanel chartPanel;
/**
* Creates a new demo.
*
* @param title the frame title.
*/
public LineChart(final String title, LineChartModel m) {
m = model;
m.selectRange();
m.createDataset();
final JFreeChart chart = createChart(m.dataset);
chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new Dimension(500, 270));
}
图表控制器
首先是构造函数的参数
public ChartController(final ManCharts v, final LineChartModel m) {
view = v;
model = m;
这里是按钮的动作监听器。
//Select a range by sumbitting the variables
v.date.btnSubmit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
//selectRange select all the data between 2 dates but isn't important for this problem
m.selectRange(/*v.date.dateChooserFrom, v.date.dateChooserTo*/);
//updateDataset updates the dataset from the LineChartModel which is static
m.updateDataset(m.dataset);
//The data in the chart should already be updated but here I'm trying to replace the current chart by a new one
v.chart.chartPanel = new ChartPanel(v.chart.createChart(m.dataset));
//This is the new chart which does automatically update when the button is pressed
JFreeChart chart = ChartFactory.createLineChart("Something chart", "Date", "Value", m.dataset);
ChartFrame frame = new ChartFrame("New line chart", chart);
frame.setVisible(true);
}
});
我真的希望有人可以提供帮助,如果没有完整的代码,这个问题不会太复杂。
如果您需要更多代码或其他内容。就这么说吧。
提前致谢!
编辑! 我认为这与我创建图表的方式有关。在我的应用程序开始时创建的 JPanel 中的图表是使用已编辑的方法创建的(这是我的 LineChart 类的一部分,位于我的构造函数下方):
/**
* Creates a sample chart.
*
* @param dataset a dataset.
*
* @return The chart.
*/
public JFreeChart createChart(final CategoryDataset dataset) {
// create the chart...
final JFreeChart chart = ChartFactory.createLineChart(
"Luggage", // chart title
"Time", // domain axis label
"Value", // range axis label
dataset, // data
PlotOrientation.VERTICAL, // orientation
true, // include legend
true, // tooltips
false // urls
);
chart.setBackgroundPaint(Color.decode("#d6d9df"));
final CategoryPlot plot = (CategoryPlot) chart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
plot.setRangeGridlinePaint(Color.white);
// customise the range axis...
final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
rangeAxis.setAutoRangeIncludesZero(true);
// customise the renderer...
final LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();
//renderer.setDrawShapes(true);
renderer.setSeriesStroke(
0, new BasicStroke(
2.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND,
1.0f, new float[] {10.0f, 6.0f}, 0.0f
)
);
renderer.setSeriesStroke(
1, new BasicStroke(
2.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND,
1.0f, new float[] {6.0f, 6.0f}, 0.0f
)
);
renderer.setSeriesStroke(
2, new BasicStroke(
2.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND,
1.0f, new float[] {2.0f, 6.0f}, 0.0f
)
);
// OPTIONAL CUSTOMISATION COMPLETED.
return chart;
}
已解决 它与单击提交按钮时创建的另一个数据集有关。所以我已经修复了娱乐,现在它正在工作。不是真正的图表问题,而只是我模型中的问题。无论如何感谢您的帮助!
【问题讨论】:
标签: java model-view-controller dataset jfreechart