[英]How to remove separator line in jfree chart- donut chart
我正在使用Jfreechart创建甜甜圈图表。 我想删除分隔线(即绿色部分和白色部分之间的线) - 这条线超出了图表部分。 我需要将其限制为图表宽度。
在这个添加的图像中,您可以清楚地看到图表饼外的扩展部分断开线(以蓝色圆圈标记)。 我需要摆脱那条延长线,断面线不应超出实际的馅饼面积。
任何人都帮助我实现这些目标。
以下是我正在使用的代码:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlotState;
import org.jfree.chart.plot.RingPlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.text.TextUtilities;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.TextAnchor;
public class DonutChart extends ApplicationFrame {
private static final long serialVersionUID = 1L;
static class CustomRingPlot extends RingPlot {
private Font centerTextFont;
private Color centerTextColor;
public CustomRingPlot(PieDataset dataset) {
super(dataset);
this.centerTextFont = new Font(Font.SANS_SERIF, Font.BOLD, 24);
this.centerTextColor = Color.BLACK;
}
@Override
protected void drawItem(Graphics2D g2, int section,
Rectangle2D dataArea, PiePlotState state, int currentPass) {
super.drawItem(g2, section, dataArea, state, currentPass);
if (currentPass == 1 && section == 0) {
Number n = this.getDataset().getValue(section);
g2.setFont(this.centerTextFont);
g2.setPaint(this.centerTextColor);
TextUtilities.drawAlignedString(n.toString(), g2,
(float) dataArea.getCenterX(),
(float) dataArea.getCenterY(),
TextAnchor.CENTER);
}
}
}
public DonutChart(String title) {
super(title);
setContentPane(createDemoPanel());
}
private static PieDataset createDataset() {
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("A", 71);
dataset.setValue("B", 29);
return dataset;
}
private static JFreeChart createChart(PieDataset dataset) {
CustomRingPlot plot = new CustomRingPlot(dataset);
JFreeChart chart = new JFreeChart("",
JFreeChart.DEFAULT_TITLE_FONT, plot, false);
plot.setBackgroundPaint(null);
plot.setOutlineVisible(false);
plot.setLabelGenerator(null);
plot.setSectionPaint("A", Color.RED);
plot.setSectionPaint("B", Color.WHITE);
plot.setSectionDepth(0.5);
plot.setSectionOutlinesVisible(true);
plot.setSectionOutlinePaint(Color.RED);
plot.setShadowPaint(null);
return chart;
}
public static JPanel createDemoPanel() {
JFreeChart chart = createChart(createDataset());
chart.setPadding(new RectangleInsets(4, 8, 2, 2));
ChartPanel panel = new ChartPanel(chart);
panel.setMouseWheelEnabled(true);
panel.setPreferredSize(new Dimension(600, 300));
return panel;
}
public static void main(String[] args) {
RingChartDemo1 demo = new RingChartDemo1("JFreeChart: Ring Chart Demo 1");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}
观察到的线是所谓的“分隔线”。 RingPlot
有几种控制它们的方法; 其中,请参阅setSeparatorsVisible(boolean)
。
通过在方法createChart()
调用plot.setSeparatorsVisible(false)
,可以隐藏这些行。
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