如何将 jfree 图表作为小程序运行? [英] How can I run jfree chart as applet?
本文介绍了如何将 jfree 图表作为小程序运行?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我对java不太了解，但希望以下代码作为小程序运行.请求真诚的帮助.
I dont have much understanding in java but want the following code to run as applet. Request sincere help on this.
谁能帮我将此代码作为小程序运行?这是 Jfree 图表，我想将它作为小程序运行.请提出建议.
Can anyone help me running this code as applet? This is Jfree chart and i want to run it as an applet. Suggestion please.
package org.jfree.chart.demo;
import java.awt.Color;
import java.text.SimpleDateFormat;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.StandardChartTheme;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;
/**
* An example of a time series chart. For the most part, default settings are
* used, except that the renderer is modified to show filled shapes (as well as
* lines) at each data point.
*/
public class TimeSeriesChartDemo1 extends ApplicationFrame {
private static final long serialVersionUID = 1L;
{
// set a theme using the new shadow generator feature available in
// 1.0.14 - for backwards compatibility it is not enabled by default
ChartFactory.setChartTheme(new StandardChartTheme("JFree/Shadow",
true));
}
/**
* A demonstration application showing how to create a simple time series
* chart. This example uses monthly data.
*
* @param title the frame title.
*/
public TimeSeriesChartDemo1(String title) {
super(title);
ChartPanel chartPanel = (ChartPanel) createDemoPanel();
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
setContentPane(chartPanel);
}
/**
* Creates a chart.
*
* @param dataset a dataset.
*
* @return A chart.
*/
private static JFreeChart createChart(XYDataset dataset) {
JFreeChart chart = ChartFactory.createTimeSeriesChart(
"Legal & General Unit Trust Prices", // title
"Date", // x-axis label
"Price Per Unit", // y-axis label
dataset, // data
true, // create legend?
true, // generate tooltips?
false // generate URLs?
);
chart.setBackgroundPaint(Color.white);
XYPlot plot = (XYPlot) chart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
plot.setDomainCrosshairVisible(true);
plot.setRangeCrosshairVisible(true);
XYItemRenderer r = plot.getRenderer();
if (r instanceof XYLineAndShapeRenderer) {
XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r;
renderer.setBaseShapesVisible(true);
renderer.setBaseShapesFilled(true);
renderer.setDrawSeriesLineAsPath(true);
}
DateAxis axis = (DateAxis) plot.getDomainAxis();
axis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
return chart;
}
/**
* Creates a dataset, consisting of two series of monthly data.
*
* @return The dataset.
*/
private static XYDataset createDataset() {
TimeSeries s1 = new TimeSeries("L&G European Index Trust");
s1.add(new Month(2, 2001), 181.8);
s1.add(new Month(3, 2001), 167.3);
s1.add(new Month(4, 2001), 153.8);
s1.add(new Month(5, 2001), 167.6);
s1.add(new Month(6, 2001), 158.8);
s1.add(new Month(7, 2001), 148.3);
s1.add(new Month(8, 2001), 153.9);
s1.add(new Month(9, 2001), 142.7);
s1.add(new Month(10, 2001), 123.2);
s1.add(new Month(11, 2001), 131.8);
s1.add(new Month(12, 2001), 139.6);
s1.add(new Month(1, 2002), 142.9);
s1.add(new Month(2, 2002), 138.7);
s1.add(new Month(3, 2002), 137.3);
s1.add(new Month(4, 2002), 143.9);
s1.add(new Month(5, 2002), 139.8);
s1.add(new Month(6, 2002), 137.0);
s1.add(new Month(7, 2002), 132.8);
TimeSeries s2 = new TimeSeries("L&G UK Index Trust");
s2.add(new Month(2, 2001), 129.6);
s2.add(new Month(3, 2001), 123.2);
s2.add(new Month(4, 2001), 117.2);
s2.add(new Month(5, 2001), 124.1);
s2.add(new Month(6, 2001), 122.6);
s2.add(new Month(7, 2001), 119.2);
s2.add(new Month(8, 2001), 116.5);
s2.add(new Month(9, 2001), 112.7);
s2.add(new Month(10, 2001), 101.5);
s2.add(new Month(11, 2001), 106.1);
s2.add(new Month(12, 2001), 110.3);
s2.add(new Month(1, 2002), 111.7);
s2.add(new Month(2, 2002), 111.0);
s2.add(new Month(3, 2002), 109.6);
s2.add(new Month(4, 2002), 113.2);
s2.add(new Month(5, 2002), 111.6);
s2.add(new Month(6, 2002), 108.8);
s2.add(new Month(7, 2002), 101.6);
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(s1);
dataset.addSeries(s2);
return dataset;
}
/**
* Creates a panel for the demo (used by SuperDemo.java).
*
* @return A panel.
*/
public static JPanel createDemoPanel() {
JFreeChart chart = createChart(createDataset());
ChartPanel panel = new ChartPanel(chart);
panel.setFillZoomRectangle(true);
panel.setMouseWheelEnabled(true);
return panel;
}
/**
* Starting point for the demonstration application.
*
* @param args ignored.
*/
public static void main(String[] args) {
TimeSeriesChartDemo1 demo = new TimeSeriesChartDemo1(
"Time Series Chart Demo 1");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}
推荐答案
您需要扩展 Applet 类并覆盖 paint(Graphics g) 方法.关键代码是 chart.draw( (Graphics2D) g,getBounds()); 用于在 Graphics g 上绘制图表.
You need to extend the Applet class and override the paint(Graphics g) method. the key code is chart.draw( (Graphics2D) g,getBounds()); to used the draw the chart on the Graphics g.
如果您是 Java 新手，您可能需要查看 教程
If you are new to Java you may want to take a look at the tutorial
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.text.SimpleDateFormat;
import javax.swing.JApplet;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleInsets;
public class AppletDemo extends JApplet {
@Override
public void paint(Graphics g) {
JFreeChart chart = createChart(createDataset());
chart.draw( (Graphics2D)g,getBounds());
}
private static JFreeChart createChart(XYDataset dataset) {
JFreeChart chart = ChartFactory.createTimeSeriesChart(
"Example Chart",
"Date",
"Value",
dataset,
true,
true,
false
);
chart.setBackgroundPaint(Color.white);
XYPlot plot = (XYPlot) chart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
plot.setDomainCrosshairVisible(true);
plot.setRangeCrosshairVisible(true);
XYItemRenderer r = plot.getRenderer();
if (r instanceof XYLineAndShapeRenderer) {
XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r;
renderer.setBaseShapesVisible(true);
renderer.setBaseShapesFilled(true);
renderer.setDrawSeriesLineAsPath(true);
}
DateAxis axis = (DateAxis) plot.getDomainAxis();
axis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
return chart;
}
private static XYDataset createDataset() {
TimeSeries s1 = new TimeSeries("Series 1");
s1.add(new Month(2, 2001), Math.random());
s1.add(new Month(3, 2001), Math.random());
s1.add(new Month(4, 2001), Math.random());
s1.add(new Month(5, 2001), Math.random());
TimeSeries s2 = new TimeSeries("Series 2");
s2.add(new Month(2, 2001), Math.random());
s2.add(new Month(3, 2001), Math.random());
s2.add(new Month(4, 2001), Math.random());
s2.add(new Month(5, 2001), Math.random());
s2.add(new Month(6, 2001), Math.random());
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(s1);
dataset.addSeries(s2);
return dataset;
}
}
这篇关于如何将 jfree 图表作为小程序运行?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！
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