在JFreeChart PieChart中,将与各部分无关的文本添加到Legend中,可以通过以下步骤实现:
以下是一个示例代码:
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.LegendItemSource;
import org.jfree.chart.LegendRenderer;
import org.jfree.chart.StandardChartTheme;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.ui.RectangleEdge;
import javax.swing.*;
import java.awt.*;
public class PieChartDemo {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new JFrame("Pie Chart Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800, 600);
JFreeChart chart = createChart();
ChartPanel chartPanel = new ChartPanel(chart);
frame.add(chartPanel);
frame.setVisible(true);
});
}
private static JFreeChart createChart() {
// 设置图表主题
StandardChartTheme chartTheme = new StandardChartTheme("JFree");
chartTheme.setExtraMarkup("<mxfile version=\"3.0\">\n" +
" <diagram>JFreeChart</diagram>\n" +
" <background>\n" +
" <fillColor>#FFFFFF</fillColor>\n" +
" <gradientColor>#FFFFFF</gradientColor>\n" +
" </background>\n" +
" <foreground>\n" +
" <fillColor>#000000</fillColor>\n" +
" <gradientColor>#000000</gradientColor>\n" +
" </foreground>\n" +
" <stroke>\n" +
" <color>#000000</color>\n" +
" <width>1.0</width>\n" +
" </stroke>\n" +
" <font>\n" +
" <name>SansSerif</name>\n" +
" <size>12</size>\n" +
" <bold>false</bold>\n" +
" <italic>false</italic>\n" +
" <underline>false</underline>\n" +
" </font>\n" +
" <connect>\n" +
" <color>#000000</color>\n" +
" <type>straight</type>\n" +
" <routing>orthogonal</routing>\n" +
" <arrow>none</arrow>\n" +
" </connect>\n" +
" <swimlane>\n" +
" <fillColor>#FFFFFF</fillColor>\n" +
" <gradientColor>#FFFFFF</gradientColor>\n" +
" <font>\n" +
" <name>SansSerif</name>\n" +
" <size>12</size>\n" +
" <bold>false</bold>\n" +
" <italic>false</italic>\n" +
" <underline>false</underline>\n" +
" </font>\n" +
" </swimlane>\n" +
" <page>\n" +
" <width>827</width>\n" +
" <height>1169</height>\n" +
" <margin>\n" +
" <top>20</top>\n" +
" <left>20</left>\n" +
" <bottom>20</bottom>\n" +
" <right>20</right>\n" +
" </margin>\n" +
" <background>\n" +
" <fillColor>#FFFFFF</fillColor>\n" +
" <gradientColor>#FFFFFF</gradientColor>\n" +
" </background>\n" +
" <foreground>\n" +
" <fillColor>#000000</fillColor>\n" +
" <gradientColor>#000000</gradientColor>\n" +
" </foreground>\n" +
" <stroke>\n" +
" <color>#000000</color>\n" +
" <width>1.0</width>\n" +
" </stroke>\n" +
" <font>\n" +
" <name>SansSerif</name>\n" +
" <size>12</size>\n" +
" <bold>false</bold>\n" +
" <italic>false</italic>\n" +
" <underline>false</underline>\n" +
" </font>\n" +
" </page>\n" +
"</mxfile>");
ChartFactory.setChartTheme(chartTheme);
// 创建数据集
PieDataset dataset = createDataset();
// 创建饼图
JFreeChart chart = ChartFactory.createPieChart("Pie Chart Demo", dataset, true, true, false);
// 获取饼图的Plot
PiePlot plot = (PiePlot) chart.getPlot();
// 创建自定义的LegendItem
LegendItem customLegendItem = new LegendItem("Custom Text", Color.BLACK, "Custom Text");
// 获取饼图的LegendItems集合
LegendItemCollection legendItems = plot.getLegendItems();
// 将自定义的LegendItem添加到LegendItems集合中
legendItems.add(customLegendItem);
// 创建自定义的LegendRenderer
LegendRenderer legendRenderer = new LegendRenderer() {
@Override
public Shape draw(Graphics2D g2, Rectangle2D area, int layer, int slice, int series, double value) {
Shape shape = super.draw(g2, area, layer, slice, series, value);
if (layer == 0 && slice == legendItems.getItemCount() - 1) {
g2.setColor(Color.BLACK);
g2.setFont(getItemFont(legendItems.getItemCount() - 1));
String text = customLegendItem.getLabel();
Rectangle2D textBounds = g2.getFontMetrics().getStringBounds(text, g2);
double x = area.getX() + area.getWidth() / 2 - textBounds.getWidth() / 2;
double y = area.getY() + area.getHeight() / 2 + textBounds.getHeight() / 2;
g2.drawString(text, (int) x, (int) y);
}
return shape;
}
};
// 将自定义的LegendRenderer设置为饼图的LegendRenderer
plot.setLegendRenderer(legendRenderer);
return chart;
}
private static DefaultPieDataset createDataset() {
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("Category 1", 25);
dataset.setValue("Category 2", 25);
dataset.setValue("Category 3", 25);
dataset.setValue("Category 4", 25);
return dataset;
}
}
在这个示例中,我们创建了一个饼图,并向其中添加了4个部分。然后,我们创建了一个自定义的LegendItem,并将其添加到饼图的LegendItems集合中。最后,我们创建了一个自定义的LegendRenderer,并在其中绘制了自定义的文本。
这个示例中的自定义文本是"Custom Text",你可以根据需要修改这个文本。
领取专属 10元无门槛券
手把手带您无忧上云