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java - JFreeChart:使用 ChartMouseListener 和鼠标移动在 ChartPanel 中动态选择点

转载 作者:行者123 更新时间:2023-12-01 18:31:07 26 4
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我有一个使用 JFreeChart 的图表,单击后将标记放在相关位置上(见下图)。

我需要的是在单击后而不是在鼠标移动后更改位置。

我知道使用模块 ChartMouseListener 我可以扩展它的功能。

    ChartMouseListener l = new ChartMouseListener() {
@Override
public void chartMouseMoved(ChartMouseEvent e) {
int newX = e.getTrigger().getX();
int newY = e.getTrigger().getY();
System.out.println("chartMouseMoved to " + newX + " " + newY);
}
@Override
public void chartMouseClicked(ChartMouseEvent e) {
}
};
chartPanel.addChartMouseListener(l);

如何设置图表中选定的轴?

JFreeChart withd aditional axis

    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.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
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.entity.XYItemEntity;
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(800, 600));
setContentPane(chartPanel);
ChartMouseListener l = new ChartMouseListener() {
@Override
public void chartMouseMoved(ChartMouseEvent e) {
int newX = e.getTrigger().getX();
int newY = e.getTrigger().getY();
System.out.println("chartMouseMoved to " + newX + " " + newY);
}
@Override
public void chartMouseClicked(ChartMouseEvent e) {
}
};
System.out.println(chartPanel.getMouseListeners()[0]);
chartPanel.addChartMouseListener(l);
}

/**
* 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?
true // 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, 1), .8);
s1.add(new Month(3, 1), .3);
s1.add(new Month(4, 1), .8);
s1.add(new Month(5, 1), .6);
s1.add(new Month(6, 1), .8);
s1.add(new Month(7, 1), .3);
s1.add(new Month(8, 1), .9);
s1.add(new Month(9, 1), .7);
s1.add(new Month(10, 1), .2);
s1.add(new Month(11, 1), .8);
s1.add(new Month(12, 1), .6);
s1.add(new Month(1, 2), .9);
s1.add(new Month(2, 2), .7);
s1.add(new Month(3, 2), .3);
s1.add(new Month(4, 2), .9);
s1.add(new Month(5, 2), .8);
s1.add(new Month(6, 2), .0);
s1.add(new Month(7, 2), .8);

TimeSeries s2 = new TimeSeries("L&G UK Index Trust");
s2.add(new Month(2, 1), .6);
s2.add(new Month(3, 1), .2);
s2.add(new Month(4, 1), .2);
s2.add(new Month(5, 1), .1);
s2.add(new Month(6, 1), .6);
s2.add(new Month(7, 1), .2);
s2.add(new Month(8, 1), .5);
s2.add(new Month(9, 1), .7);
s2.add(new Month(10, 1), .5);
s2.add(new Month(11, 1), .1);
s2.add(new Month(12, 1), .3);
s2.add(new Month(1, 2), .7);
s2.add(new Month(2, 2), .0);
s2.add(new Month(3, 2), .6);
s2.add(new Month(4, 2), .2);
s2.add(new Month(5, 2), .6);
s2.add(new Month(6, 2), .8);
s2.add(new Month(7, 2), .6);

// ******************************************************************
// More than demo applications are included with the JFreeChart
// Developer Guide...for more information, see:
//
// > http://www.object-refinery.com/jfreechart/guide.html
//
// ******************************************************************

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);

}

}

最佳答案

有几种方法可以在 JFreeChart 中绘制十字线。对于您给出的示例,十字准线是作为图表的一部分绘制的,因此每次十字准线的位置发生变化时,都需要重新绘制图表。在鼠标移动事件上执行此操作不会非常有效。

另一种方法是使用 CrosshairOverlay 类。这会将十字准线绘制为现有图表上的叠加层,从而避免在十字准线值发生变化时重新绘制图表。这对于你想做的事情会更好。

JFreeChart 开发人员指南中包含了一些有关此功能的示例(我们鼓励 JFreeChart 用户购买,这样他们就可以在经济上帮助 JFreeChart 项目 - 只有很小一部分人这样做,但这就是人性)。

这是示例之一:

/* --------------------------
* CrosshairOverlayDemo1.java
* --------------------------
* (C) Copyright 2003-2014, by Object Refinery Limited.
*
*/

package demo;

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
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.axis.ValueAxis;
import org.jfree.chart.panel.CrosshairOverlay;
import org.jfree.chart.plot.Crosshair;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.RectangleEdge;

/**
* A demo showing crosshairs that follow the data points on an XYPlot.
*/
public class CrosshairOverlayDemo1 extends JFrame {

static class MyDemoPanel extends JPanel implements ChartMouseListener {

private ChartPanel chartPanel;

private Crosshair xCrosshair;

private Crosshair yCrosshair;

public MyDemoPanel() {
super(new BorderLayout());
JFreeChart chart = createChart(createDataset());
this.chartPanel = new ChartPanel(chart);
this.chartPanel.addChartMouseListener(this);
CrosshairOverlay crosshairOverlay = new CrosshairOverlay();
this.xCrosshair = new Crosshair(Double.NaN, Color.GRAY,
new BasicStroke(0f));
this.xCrosshair.setLabelVisible(true);
this.yCrosshair = new Crosshair(Double.NaN, Color.GRAY,
new BasicStroke(0f));
this.yCrosshair.setLabelVisible(true);
crosshairOverlay.addDomainCrosshair(xCrosshair);
crosshairOverlay.addRangeCrosshair(yCrosshair);
this.chartPanel.addOverlay(crosshairOverlay);
add(this.chartPanel);
}

private JFreeChart createChart(XYDataset dataset) {
JFreeChart chart = ChartFactory.createXYLineChart(
"CrosshairOverlayDemo1", "X", "Y", dataset);
return chart;
}

private XYDataset createDataset() {
XYSeries series = new XYSeries("S1");
for (int x = 0; x < 10; x++) {
series.add(x, x + Math.random() * 4.0);
}
XYSeriesCollection dataset = new XYSeriesCollection(series);
return dataset;
}

@Override
public void chartMouseClicked(ChartMouseEvent event) {
// ignore
}

@Override
public void chartMouseMoved(ChartMouseEvent event) {
Rectangle2D dataArea = this.chartPanel.getScreenDataArea();
JFreeChart chart = event.getChart();
XYPlot plot = (XYPlot) chart.getPlot();
ValueAxis xAxis = plot.getDomainAxis();
double x = xAxis.java2DToValue(event.getTrigger().getX(), dataArea,
RectangleEdge.BOTTOM);
// make the crosshairs disappear if the mouse is out of range
if (!xAxis.getRange().contains(x)) {
x = Double.NaN;
}
double y = DatasetUtilities.findYValue(plot.getDataset(), 0, x);
this.xCrosshair.setValue(x);
this.yCrosshair.setValue(y);
}

}

public CrosshairOverlayDemo1(String title) {
super(title);
setContentPane(createDemoPanel());
}

/**
* Creates a panel for the demo (used by SuperDemo.java).
*
* @return A panel.
*/
public static JPanel createDemoPanel() {
return new MyDemoPanel();
}

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
CrosshairOverlayDemo1 app = new CrosshairOverlayDemo1(
"JFreeChart: CrosshairOverlayDemo1.java");
app.pack();
app.setVisible(true);
}
});
}

}

关于java - JFreeChart:使用 ChartMouseListener 和鼠标移动在 ChartPanel 中动态选择点,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24188142/

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