具有延迟的Java事件处理
import java.awt.Color; import java.awt.Dimension; import javax.swing.JPanel; import javax.swing.Timer; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartMouseEvent; import org.jfree.chart.ChartMouseListener; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.entity.ChartEntity; import org.jfree.chart.plot.PiePlot; import org.jfree.chart.plot.PiePlot3D; import org.jfree.data.general.DefaultPieDataset; import org.jfree.data.general.PieDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; /** * A simple demonstration application showing how to create a pie chart using * data from a {@link DefaultPieDataset}. */ public class PieChartDemo1 extends ApplicationFrame implements ChartMouseListener { private JFreeChart chart; private PiePlot plot; private int angle=270; private static double explodePercent = 0.99; private static long count=0; /** * Default constructor. * * @param title the frame title. */ public PieChartDemo1(String title) { super(title); this.chart = ChartFactory.createPieChart( "Pie Chart Demo 1", // chart title createDataset(), // data true, // include legend true, false ); this.plot = (PiePlot) chart.getPlot(); this.plot.setSectionOutlinesVisible(false); this.plot.setNoDataMessage("No data available"); this.plot.setBackgroundAlpha(0.2f); this.plot.setBackgroundPaint(Color.WHITE); this.plot.setExplodePercent("One",.99); this.angle=270; ChartPanel chartpanel = new ChartPanel(chart, false, false, false, false, false); chartpanel.setVisible(true); chartpanel.addChartMouseListener(this); chartpanel.setPreferredSize(new Dimension(500, 270)); setContentPane(chartpanel); } /** * Creates a sample dataset. * * @return A sample dataset. */ private static PieDataset createDataset() { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue("One", new Double(43.2)); dataset.setValue("Two", new Double(10.0)); dataset.setValue("Three", new Double(27.5)); dataset.setValue("Four", new Double(17.5)); dataset.setValue("Five", new Double(11.0)); dataset.setValue("Six", new Double(19.4)); return dataset; } /** * Creates a chart. * * @param dataset the dataset. * * @return A chart. */ private static JFreeChart createChart(PieDataset dataset) { JFreeChart chart = ChartFactory.createPieChart3D( "Pie Chart Demo 1", // chart title dataset, // data true, // include legend true, false ); PiePlot plot = (PiePlot) chart.getPlot(); plot.setSectionOutlinesVisible(false); plot.setNoDataMessage("No data available"); plot.setBackgroundAlpha(0.2f); return chart; } /** * Creates a panel for the demo (used by SuperDemo.java). * * @return A panel. */ public static JPanel createDemoPanel() { JFreeChart chart = createChart(createDataset()); ChartPanel chartpanel = new ChartPanel(chart, false, false, false, false, false); chartpanel.setVisible(true); chartpanel.setPreferredSize(new Dimension(500, 270)); return new JPanel(); } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(String[] args) { PieChartDemo1 demo = new PieChartDemo1("Pie Chart Demo 1"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } public void chartMouseClicked(ChartMouseEvent chartmouseevent) { ChartEntity chartentity = chartmouseevent.getEntity(); if (chartentity != null){ this.plot.setStartAngle(angle); this.angle=angle+5; this.plot.setStartAngle(angle); this.plot.setExplodePercent("One", .8); System.out.println("Mouse clicked: " + chartentity.toString()); } else System.out.println("Mouse clicked: null entity."); } public void chartMouseMoved(ChartMouseEvent chartmouseevent) { int i = chartmouseevent.getTrigger().getX(); int j = chartmouseevent.getTrigger().getY(); ChartEntity chartentity = chartmouseevent.getEntity(); if (chartentity != null) { //this.plot.setStartAngle(angle); //this.angle=angle-5; //this.plot.setStartAngle(angle); System.out.println("Explode Percent is "+plot.getExplodePercent("One")); Rotator rotator=new Rotator(plot); rotator.setInitialDelay(10000000); rotator.setDelay(100000000); rotator.start(); //System.out.println("Mouse moved: " + i + ", " + j + ": " + chartentity.toString()); } //else //System.out.println("Mouse moved: " + i + ", " + j + ": null entity."); } static class Rotator extends Timer { /** The plot. */ private PiePlot plot; /** The angle. */ private int X,Y; /** * Constructor. * * @param plot the plot. */ Rotator(final PiePlot plot) { super(100,null); this.plot = plot; while(count=0){ if(explodePercent>0) explodePercent=explodePercent-.0001; else explodePercent=explodePercent+.0001; plot.setExplodePercent("One", explodePercent); count++; } } } }
上面的代码用于创建图表，我必须开发类似amcharts链接的东西
我尝试使用Timer，但不论我使用何种延迟，事件都不会延迟。任何人都可以帮助我延迟？ 这与Jcharts没有任何关系。这纯粹是事件处理。
你正在做你的计时器监听器应该在你的Rotator的构造函数中执行的逻辑。 这样你就可以毫不拖延地立即执行动作。 你也没有任何正在听定时器事件的东西。
相反，你应该让你的PieChartDemo实现ActionListener并让它进行你的计时器处理：
public void actionPerformed(ActionEvent actionevent) { //you can test if the event has come in from the timer if (actionevent.getSource() == myTimer) { while(count<999999999&&explodePercent>=0){ if(explodePercent>0) explodePercent=explodePercent-.0001; else explodePercent=explodePercent+.0001; getPlot().setExplodePercent("One", explodePercent); count++; } } }
或类似的东西。
您还需要将ActionListener传递给构造函数：
旧：
Rotator(final PiePlot plot) { super(100,null); // this passes a null listener to the timer object
新：
Rotator(final PiePlot plot, ActionListener listener) { super(100, listener); // this will pass in the listener, which will then get timer updates, delayed as you have specified.
这是一个关于摇摆计时器的好教程
您的鼠标事件处理程序永远不会释放CPU。 Rotator不会导致线程hibernate，因此只要处理鼠标事件就会发生整个延迟。