平滑地每500毫秒渲染Swing组件 [英] Rendering Swing component smoothly every 500 millisecond

问题描述

当我每隔500毫秒调用 paintComponent（）来显示更新的图表时，我面临着渲染问题。我使用 JFreeChart 在面板上创建了约30个barcharts。

  import java.awt.BorderLayout; 
 import java.awt.Dimension; 
 import java.awt.EventQueue; 
 import java.awt.GridLayout; 
 import java.awt.event.ActionEvent; 
 import java.awt.event.ActionListener; 
 import java.util.Random; 
 import javax.swing.JFrame; 
 import javax.swing.JPanel; 
 import javax.swing.Timer; 
 import org.jfree.chart.ChartFactory; 
 import org.jfree.chart.ChartPanel; 
 import org.jfree.chart.JFreeChart; 
 import org.jfree.chart.plot.PlotOrientation; 
 import org.jfree.data.xy.XYSeries; 
 import org.jfree.data.xy.XYSeriesCollection; 
 
 / ** 
 * @see http://stackoverflow.com/a/38512314/230513 
 * @see http://stackoverflow.com/a/15715096/ 230513 
 * @see http://stackoverflow.com/a/11949899/230513 
 * / 
 public class Test {
 
 private static final int N = 128 ; 
 private static final随机随机= new Random（）; 
 private int n = 1; 
 
 private void display（）{
 JFrame f = new JFrame（TabChart）; 
 f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 JPanel p = new JPanel（new GridLayout（0，1））; 
 for（int i = 0; i <3; i ++）{
 p.add（createPane（））; 
} 
 f.add（p，BorderLayout.CENTER）; 
 f.pack（）; 
 f.setLocationRelativeTo（null）; 
 f.setVisible（true）; 
} 
 
 private ChartPanel createPane（）{
 final XYSeries series = new XYSeries（Data）; 
 for（int i = 0; i  series.add（i，random.nextGaussian 
} 
 XYSeriesCollection dataset = new XYSeriesCollection（series）; 
 new Timer（500，new ActionListener（）{
 
 @Override 
 public void actionPerformed（ActionEvent e）{
 series.add（series.getItemCount random.nextGaussian（））; 
} 
}）。 
 JFreeChart chart = ChartFactory.createXYLineChart（Test，Domain，
Range，dataset，PlotOrientation.VERTICAL，false，false，false）; 
返回新的ChartPanel（图表）{
 @Override 
 public Dimension getPreferredSize（）{
 return new Dimension（480，240）; 
} 
}; 
} 
 
 public static void main（String [] args）{
 EventQueue.invokeLater（new Runnable（）{
 @Override 
 public void run （）{
 new Test（）。display（）; 
} 
}）; 
} 
} 
  

I am facing rendering problem when I call paintComponent() every 500 millisecond to show updated charts. I have around 30 barcharts created by using JFreeChart on Panel.

Rendering with error and How can I solve this problem?

private void ShowGraphs() {

   FirstChart.removeAll();
   SecondChart.removeAll();
   ThirdChart.removeAll();
   FirstChart.add(Label1);
   SecondChart.add(Label2);
   ThirdChart.add(Label3);

   ChartUpdate(P1,FirstChart);
   ChartUpdate(P2,SecondChart);
   ChartUpdate(P3,ThirdChart);
   //FirstChart, SecondChart, ThirdChart is JPanels
   //Tabb is JTabbedPane
   paintComponents(Tabb.getGraphics());
}

This code is called every 500 milliseconds and ChartUpdate(MyObject, Panel) is chart building function on Panel using MyObject's info.

解决方案

Don't replace the view component. Instead, update the corresponding model and the listening view will update itself in response. In the example below, each ChartPanel returned by createPane() has a Swing Timer that updates its XYSeries every 500 ms.

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * @see http://stackoverflow.com/a/38512314/230513
 * @see http://stackoverflow.com/a/15715096/230513
 * @see http://stackoverflow.com/a/11949899/230513
 */
public class Test {

    private static final int N = 128;
    private static final Random random = new Random();
    private int n = 1;

    private void display() {
        JFrame f = new JFrame("TabChart");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel p = new JPanel(new GridLayout(0, 1));
        for (int i = 0; i < 3; i++) {
            p.add(createPane());
        }
        f.add(p, BorderLayout.CENTER);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private ChartPanel createPane() {
        final XYSeries series = new XYSeries("Data");
        for (int i = 0; i < random.nextInt(N) + N / 2; i++) {
            series.add(i, random.nextGaussian());
        }
        XYSeriesCollection dataset = new XYSeriesCollection(series);
        new Timer(500, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                series.add(series.getItemCount(), random.nextGaussian());
            }
        }).start();
        JFreeChart chart = ChartFactory.createXYLineChart("Test", "Domain",
            "Range", dataset, PlotOrientation.VERTICAL, false, false, false);
        return new ChartPanel(chart) {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(480, 240);
            }
        };
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Test().display();
            }
        });
    }
}

这篇关于平滑地每500毫秒渲染Swing组件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！