用Jfreechart的时候,折线3D图,如果只有一个点的话,这个点就不显示!有什么办法让他显示出来吗?(有源码),可以直接运行出效果啊

[nil2000]

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.geom.Ellipse2D;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.HorizontalAlignment;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RefineryUtilities;

/**
 * A simple demonstration application showing how to create a line chart using 
 * data from a {@link CategoryDataset}.
 */
public class LineChartDemo1 extends ApplicationFrame {

    /**
     * Creates a new demo.
     *
     * @param title  the frame title.
     */
    public LineChartDemo1(String title) {
        super(title);
        JPanel chartPanel = createDemoPanel();
        chartPanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartPanel);
    }

    /**
     * Creates a sample dataset.
     * 
     * @return The dataset.
     */
    private static CategoryDataset createDataset() {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(212, "Classes", "JDK 1.0");

        return dataset;
    }
    
    /**
     * Creates a sample chart.
     * 
     * @param dataset  a dataset.
     * 
     * @return The chart.
     */
    private static JFreeChart createChart(CategoryDataset dataset) {
        
        // create the chart...
        JFreeChart chart = ChartFactory.createLineChart3D(
            "Java Standard Class Library",   // chart title
            null,                       // domain axis label
            "Class Count",                   // range axis label
            dataset,                         // data
            PlotOrientation.VERTICAL,        // orientation
            false,                           // include legend
            true,                            // tooltips
            false                            // urls
        );

        chart.addSubtitle(new TextTitle("Number of Classes By Release"));
        TextTitle source = new TextTitle(
            "Source: Java In A Nutshell (5th Edition) " 
            + "by David Flanagan (O'Reilly)"
        );
        source.setFont(new Font("SansSerif", Font.PLAIN, 10));
        source.setPosition(RectangleEdge.BOTTOM);
        source.setHorizontalAlignment(HorizontalAlignment.RIGHT);
        chart.addSubtitle(source);
        
        chart.setBackgroundPaint(Color.white);

        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        plot.setBackgroundPaint(Color.lightGray);
        plot.setRangeGridlinesVisible(false);
        URL imageURL = LineChartDemo1.class.getClassLoader().getResource(
            "OnBridge11small.png");
        if (imageURL != null) {
            ImageIcon temp = new ImageIcon(imageURL);  
            // use ImageIcon because it waits for the image to load...
            chart.setBackgroundImage(temp.getImage()); 
            plot.setBackgroundPaint(new Color(0, 0, 0, 0));            
        }
        // customise the range axis...
        NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

        // customise the renderer...
        LineAndShapeRenderer renderer 
                = (LineAndShapeRenderer) plot.getRenderer();
        renderer.setShapesVisible(true);
        renderer.setDrawOutlines(true);
        renderer.setUseFillPaint(true);
        renderer.setFillPaint(Color.white);
        renderer.setSeriesStroke(0, new BasicStroke(3.0f));
        renderer.setSeriesOutlineStroke(0, new BasicStroke(2.0f));
        renderer.setSeriesShape(0, new Ellipse2D.Double(-5.0, -5.0, 10.0, 10.0));
        return chart;
    }
    
    /**
     * Creates a panel for the demo (used by SuperDemo.java).
     * 
     * @return A panel.
     */
    public static JPanel createDemoPanel() {
        JFreeChart chart = createChart(createDataset());
        return new ChartPanel(chart);
    }
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {
        LineChartDemo1 demo = new LineChartDemo1("JFreeChart - Line Chart Demo 1");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }

}

[老张-AI]

帮顶

[yilagong]

横坐标细化。

[cuij7718]

恩,可以判断一下,如果只有一个点,那么就再生成一个点,这个点和原点间隔很小,这样应该可以显示出来,而且视觉应该看不出来

[cuij7718]

很多图形控件,线类型 都要求至少2个点,如果是闭合线,要求至少3个点

[nil2000]

[Quote=引用 2 楼 cuij7718 的回复:]
恩,可以判断一下,如果只有一个点,那么就再生成一个点,这个点和原点间隔很小,这样应该可以显示出来,而且视觉应该看不出来
[/Quote]

不行啊........因为如果多几个点的话,那图例什么的都会体现出来啊!

主要我发现如果1个点的话不是立体的就ok只要是createLineChart3D 就不可以啊!

[nil2000]

[Quote=引用 4 楼 yilagong 的回复:]
横坐标细化。
[/Quote]
怎么细化啊!

[SKYBUSY2000]

请问这个问题有解决吗 ？
我也遇见了同样的问题 只有一个数据点时不显示