5.10 实例讲解
5.10.1 体会
也分为三层界面显示层、数据层、控制层。
- 数据层比较复杂。每个图形有不同的数据类型。Dataset类控制。
- 控制层Plot,饼图使用PiePlot设置显示的图形的面貌的控制,JFreeChart最丰富的功能。
- 设置片区颜色
- 设置标签(文本格式、背景颜色等)
- 设置是否取出某块。
- 设置饼图是否为圆形
- 设置饼图旋转。
- 显示层JFreeChart使用数据、控制直接将数据显示出来。
5.10.2 类PieChartDemo1.java
效果图如下:
代码编写典型的使用了面对对象的方法:
全部代码如下:
package demo;
import java.awt.Dimension;
import java.awt.Font;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
public class PieChartDemo1 extends ApplicationFrame {
/**
*
*/
private static final long serialVersionUID = 2598557557724085474L;
public PieChartDemo1(String string) {
super(string);
JPanel jpanel = createDemoPanel();
jpanel.setPreferredSize(new Dimension(500, 270));
setContentPane(jpanel);
}
private static PieDataset createDataset() {
DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
defaultpiedataset.setValue("One", new Double(43.2));
defaultpiedataset.setValue("Two", new Double(10.0));
defaultpiedataset.setValue("Three", new Double(27.5));
defaultpiedataset.setValue("Four", new Double(17.5));
defaultpiedataset.setValue("Five", new Double(11.0));
defaultpiedataset.setValue("Six", new Double(19.4));
return defaultpiedataset;
}
private static JFreeChart createChart(PieDataset piedataset) {
JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 1",
piedataset, true, true, false);
TextTitle texttitle = jfreechart.getTitle();
texttitle.setToolTipText("A title tooltip!");
PiePlot pieplot = (PiePlot) jfreechart.getPlot();
pieplot.setLabelFont(new Font("Arial Black", 0, 20));
pieplot.setNoDataMessage("No data available");
pieplot.setCircular(false);
pieplot.setLabelGap(0.02);
return jfreechart;
}
public static JPanel createDemoPanel() {
JFreeChart jfreechart = createChart(createDataset());
return new ChartPanel(jfreechart);
}
public static void main(String[] strings) {
PieChartDemo1 piechartdemo1 = new PieChartDemo1("Pie Chart Demo 1");
piechartdemo1.pack();
RefineryUtilities.centerFrameOnScreen(piechartdemo1);
piechartdemo1.setVisible(true);
}
}
5.10.3 类PieChartDemo2.java
功能:
“取出“片区显示。
效果:
代码:
private static JFreeChart createChart(PieDataset piedataset) {
JFreeChart jfreechart = ChartFactory.createPieChart("PieChart Demo 2", piedataset, true, true, false);
PiePlot pieplot = (PiePlot) jfreechart.getPlot();
pieplot.setSectionPaint("One", new Color(160, 160, 255));
pieplot.setSectionPaint("Two", new Color(128, 128, 223));
pieplot.setSectionPaint("Three", new Color(96, 96, 191));
pieplot.setSectionPaint("Four", new Color(64, 64, 159));
pieplot.setSectionPaint("Five", new Color(32, 32, 127));
pieplot.setSectionPaint("Six", new Color(0, 0, 111));
pieplot.setNoDataMessage("No data available");
pieplot.setExplodePercent("Two", 0.5);
pieplot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0} ({2} percent)"));
pieplot.setLabelBackgroundPaint(new Color(220, 220, 220));
pieplot.setLegendLabelToolTipGenerator(new StandardPieSectionLabelGenerator("Tooltip for legend item {0}"));
return jfreechart;
}
程序代码说明:
setSectionPaint("One", new Color(160, 160, 255))
:设置某个片区的填充颜色。第一个参数为片区的标识,第二个参数为色值。setNoDataMessage("No data available")
:设置dataset为null时显示的提示信息。setLabelGenerator(new StandardPieSectionLabelGenerator("{0}({2} percent)"))
:设置标签显示的格式。setLabelBackgroundPaint(new Color(220, 220, 220))
:设置标签的背景颜色。setLegendLabelToolTipGenerator(new StandardPieSectionLabelGenerator("Tooltip for legend item {0}"))
:设置鼠标滑过图表是显示鼠标当前片区的提示信息。pieplot.setExplodePercent("Two", 0.5)
:将第2个片区取出显示。后面一个参数是取出的距离,是一个比例数。
5.10.4 类PieChartDemo3.java
功能:
显示了dataset为空时,设置的提示信息。
效果:
代码:
private static JFreeChart createChart(PieDataset piedataset) {
JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 3",
null, true, true, false);
PiePlot pieplot = (PiePlot) jfreechart.getPlot();
pieplot.setNoDataMessage("没有有效的数据显示!");
pieplot.setNoDataMessageFont(new Font("黑体", 2, 20));
pieplot.setNoDataMessagePaint(Color.red);
return jfreechart;
}
程序代码说明:
setNoDataMessage("没有有效的数据显示!")
:设置提示信息内容。setNoDataMessageFont(new Font("Serif", 2, 10))
:设置提示信息的字体和大小。setNoDataMessagePaint(Color.red)
:设置提示信息字体的颜色。
5.10.5 类PieChartDemo4.java
功能:
带有按钮的图表,通过对dataset的排序,可以改变片区的位置。
效果:
代码:
public void actionPerformed(ActionEvent actionevent) {
String string = actionevent.getActionCommand();
if ("BY_KEY".equals(string)) {
if (!ascendingByKey) {
dataset.sortByKeys(SortOrder.ASCENDING);
ascendingByKey = true;
} else {
dataset.sortByKeys(SortOrder.DESCENDING);
ascendingByKey = false;
}
} else if ("BY_VALUE".equals(string)) {
if (!ascendingByValue) {
dataset.sortByValues(SortOrder.ASCENDING);
ascendingByValue = true;
} else {
dataset.sortByValues(SortOrder.DESCENDING);
ascendingByValue = false;
}
} else if ("RANDOM".equals(string)) {
ArrayList arraylist = new ArrayList(dataset.getKeys());
Collections.shuffle(arraylist);
DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
Iterator iterator = arraylist.iterator();
while (iterator.hasNext()) {
Comparable comparable = (Comparable) iterator.next();
defaultpiedataset.setValue(comparable, dataset
.getValue(comparable));
}
PiePlot pieplot = (PiePlot) chart.getPlot();
pieplot.setDataset(defaultpiedataset);
dataset = defaultpiedataset;
}
}
程序代码说明:
dataset.sortByKeys(SortOrder.ASCENDING);
通过片区的关键值进行升序排序。dataset.sortByValues(SortOrder.DESCENDING);
通过片区的值进行降序排序。
5.10.6 类PieChartDemo5.java
功能:
右边两个饼图为原形的,而左边两个为椭圆形的。
效果:
代码:
public static JPanel createDemoPanel() {
JPanel jpanel = new JPanel(new GridLayout(2, 2));
DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
defaultpiedataset.setValue("Section 1", 23.3);
defaultpiedataset.setValue("Section 2", 56.5);
defaultpiedataset.setValue("Section 3", 43.3);
defaultpiedataset.setValue("Section 4", 11.1);
//
JFreeChart jfreechart = ChartFactory.createPieChart("Chart 1",
defaultpiedataset, false, false, false);
jfreechart.addSubtitle(new TextTitle("setCircular(true);", new Font(
"Dialog", 0, 12)));
PiePlot pieplot = (PiePlot) jfreechart.getPlot();
pieplot.setCircular(true);
//
JFreeChart jfreechart_0_ = ChartFactory.createPieChart("Chart 2",
defaultpiedataset, false, false, false);
jfreechart_0_.addSubtitle(new TextTitle("setCircular(false);",
new Font("Dialog", 0, 12)));
PiePlot pieplot_1_ = (PiePlot) jfreechart_0_.getPlot();
pieplot_1_.setCircular(false);
//
JFreeChart jfreechart_2_ = ChartFactory.createPieChart3D("Chart 3",
defaultpiedataset, false, false, false);
jfreechart_2_.addSubtitle(new TextTitle("setCircular(true);", new Font(
"Dialog", 0, 12)));
PiePlot3D pieplot3d = (PiePlot3D) jfreechart_2_.getPlot();
pieplot3d.setForegroundAlpha(0.6F);
pieplot3d.setCircular(true);
//
JFreeChart jfreechart_3_ = ChartFactory.createPieChart3D("Chart 4",
defaultpiedataset, false, false, false);
jfreechart_3_.addSubtitle(new TextTitle("setCircular(false);",
new Font("Dialog", 0, 12)));
PiePlot3D pieplot3d_4_ = (PiePlot3D) jfreechart_3_.getPlot();
pieplot3d_4_.setForegroundAlpha(0.6F);
pieplot3d_4_.setCircular(false);
jpanel.add(new ChartPanel(jfreechart));
jpanel.add(new ChartPanel(jfreechart_0_));
jpanel.add(new ChartPanel(jfreechart_2_));
jpanel.add(new ChartPanel(jfreechart_3_));
jpanel.setPreferredSize(new Dimension(800, 600));
return jpanel;
}
程序代码说明:
pieplot.setCircular(true)
:设置饼图为圆形。jpanel.add
方法可以添加多个图形的panel
5.10.7 类PieChartDemo6.java
功能:
显示饼图对零值和null值的处理。
效果:
代码:
public static JPanel createDemoPanel() {
JPanel jpanel = new JPanel(new GridLayout(2, 2));
JFreeChart jfreechart = createChart("Pie Chart 1", createDataset());
Font font = new Font("Dialog", 0, 12);
jfreechart.addSubtitle(new TextTitle(
"Ignore nulls: false; Ignore zeros: false;", font));
JFreeChart jfreechart_0_ = createChart("Pie Chart 2", createDataset());
jfreechart_0_.addSubtitle(new TextTitle(
"Ignore nulls: true; Ignore zeros: false;", font));
PiePlot pieplot = (PiePlot) jfreechart_0_.getPlot();
pieplot.setIgnoreNullValues(true);
pieplot.setIgnoreZeroValues(false);
JFreeChart jfreechart_1_ = createChart("Pie Chart 3", createDataset());
jfreechart_1_.addSubtitle(new TextTitle(
"Ignore nulls: false; Ignore zeros: true;", font));
PiePlot pieplot_2_ = (PiePlot) jfreechart_1_.getPlot();
pieplot_2_.setIgnoreNullValues(false);
pieplot_2_.setIgnoreZeroValues(true);
JFreeChart jfreechart_3_ = createChart("Pie Chart 4", createDataset());
jfreechart_3_.addSubtitle(new TextTitle(
"Ignore nulls: true; Ignore zeros: true;", font));
PiePlot pieplot_4_ = (PiePlot) jfreechart_3_.getPlot();
pieplot_4_.setIgnoreNullValues(true);
pieplot_4_.setIgnoreZeroValues(true);
jpanel.add(new ChartPanel(jfreechart));
jpanel.add(new ChartPanel(jfreechart_0_));
jpanel.add(new ChartPanel(jfreechart_1_));
jpanel.add(new ChartPanel(jfreechart_3_));
return jpanel;
}
程序代码说明:
pieplot.setIgnoreNullValues(true)
:设置饼图忽略null值,即是null值将不显示。pieplot.setIgnoreZeroValues(false);
设置饼图不忽略零值。即图表中显示出零值。
5.10.8 类PieChartDemo7.java
功能:
图表能够旋转,标签也随之移动。
效果:
代码:
public static JPanel createDemoPanel() {
PieDataset piedataset = createDataset(14);
JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 7",
piedataset, false, true, false);
jfreechart.setBackgroundPaint(new Color(222, 222, 255));
PiePlot pieplot = (PiePlot) jfreechart.getPlot();
pieplot.setBackgroundPaint(Color.white);
pieplot.setCircular(true);
pieplot.setLabelGenerator(new StandardPieSectionLabelGenerator(
"{0} = {2}", NumberFormat.getNumberInstance(), NumberFormat
.getPercentInstance()));
pieplot.setNoDataMessage("No data available");
ChartPanel chartpanel = new ChartPanel(jfreechart);
chartpanel.setPreferredSize(new Dimension(500, 270));
Rotator rotator = new Rotator(pieplot);
rotator.start();
return chartpanel;
}
程序代码说明:
- 使用Rotator对象,旋转饼图。代码如上。
5.10.9 类PieChartDemo8.java
功能:
编写自定义标签产生器,将Two标签不显示。
效果:
代码:
private static JFreeChart createChart(PieDataset piedataset) {
JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 8",
piedataset, false, true, false);
PiePlot pieplot = (PiePlot) jfreechart.getPlot();
pieplot.setLabelGenerator(new CustomLabelGenerator());
return jfreechart;
}
static class CustomLabelGenerator implements PieSectionLabelGenerator {
public String generateSectionLabel(PieDataset piedataset,
Comparable comparable) {
String string = null;
if (piedataset != null && !comparable.equals("Two"))
string = comparable.toString();
return string;
}
public AttributedString generateAttributedSectionLabel(
PieDataset piedataset, Comparable comparable) {
Object object = null;
String string = comparable.toString();
String string_0_ = (string + " : " + String.valueOf(piedataset
.getValue(comparable)));
AttributedString attributedstring = new AttributedString(string_0_);
attributedstring.addAttribute(TextAttribute.WEIGHT,
TextAttribute.WEIGHT_BOLD, 0, string.length() - 1);
return attributedstring;
}
}
程序代码说明:
- 自定义
CustomLabelGenerator
,必须实现接口PieSectionLabelGenerator
。
5.10.10 类PieChart3DDemo1.java
功能:
3D效果的饼图。
效果:
代码:
private static JFreeChart createChart(PieDataset piedataset) {
JFreeChart jfreechart = ChartFactory.createPieChart3D(
"Pie Chart 3D Demo 1", piedataset, true, true, false);
PiePlot3D pieplot3d = (PiePlot3D) jfreechart.getPlot();
pieplot3d.setStartAngle(180.0);
pieplot3d.setDirection(Rotation.CLOCKWISE);
pieplot3d.setForegroundAlpha(0.5F);
pieplot3d.setNoDataMessage("No data to display");
return jfreechart;
}
程序代码说明:
- 使用
ChartFactory
的方法createPieChart3D
创建3D效果的饼图。 setStartAngle(180.0)
:设置旋转角度。setDirection(Rotation.CLOCKWISE)
:设置旋转方向,Rotation.CLOCKWISE
为顺时针。setForegroundAlpha(0.5F)
:设置图表透明图0.0~1.0范围。0.0为完全透明,1.0为完全不透明。
5.10.11 类MultiplePieChartDemo1.java
功能:
使用CategoryDataset数据集,在一个图表上产生多个饼图。
效果:
代码:
private static CategoryDataset createDataset() {
double[][] ds = { { 3.0, 4.0, 3.0, 5.0 }, { 5.0, 7.0, 6.0, 8.0 },
{ 5.0, 7.0, Double.NaN, 3.0 }, { 1.0, 2.0, 3.0, 4.0 },
{ 2.0, 3.0, 2.0, 3.0 } };
CategoryDataset categorydataset = DatasetUtilities
.createCategoryDataset("Region ", "Sales/Q", ds);
return categorydataset;
}
程序代码说明:
- 创建
CategoryDataset
的方法。
private static JFreeChart createChart(CategoryDataset categorydataset) {
JFreeChart jfreechart = ChartFactory.createMultiplePieChart(
"Multiple Pie Chart", categorydataset, TableOrder.BY_ROW, true, true, false);
MultiplePiePlot multiplepieplot = (MultiplePiePlot) jfreechart .getPlot();
JFreeChart jfreechart_0_ = multiplepieplot.getPieChart();
PiePlot pieplot = (PiePlot) jfreechart_0_.getPlot();
pieplot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}"));
pieplot.setLabelFont(new Font("SansSerif", 0, 8));
pieplot.setInteriorGap(0.3);
return jfreechart;
}
程序代码说明:
- 使用
ChartFactory
的方法createMultiplePieChart()
创建多个饼图的图表。 multiplepieplot.getPieChart()
:获得单个饼图的图表。