java - Jfreechart直方图设置半透明颜色

Question

我有一个这样的直方图

这里红色直方图在前面，蓝色在中间，绿色在后面。所以大部分绿色直方图看不到。是否有任何选项可以在鼠标悬停时在颜色之间切换，或者是否有任何其他选项可以查看绿色和蓝色直方图。

这是代码

public class HistogramFrame extends JFrame {

    static double[] red;
    static double[] green;
    static double[] blue;

    public HistogramFrame(String title, double[] red, double[] green, double[] blue) {
        super(title);
        HistogramFrame.red = red;
        HistogramFrame.green = green;
        HistogramFrame.blue = blue;

        JFreeChart jfreechart = ChartFactory.createHistogram("Histograms combination red,blue,green", null, null, createDataset(), PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyplot = (XYPlot) jfreechart.getPlot();
        xyplot.setForegroundAlpha(0.85F);
        XYBarRenderer xybarrenderer = (XYBarRenderer) xyplot.getRenderer();
        xybarrenderer.setDrawBarOutline(false);
        JPanel jpanel = new ChartPanel(jfreechart);
        jpanel.setPreferredSize(new Dimension(1000, 600));
        setContentPane(jpanel);
    }

    private static IntervalXYDataset createDataset() {
        HistogramDataset histogramdataset = new HistogramDataset();
        histogramdataset.addSeries("Red histogram", red, 256);
        histogramdataset.addSeries("Blue histogram", blue, 256);
        histogramdataset.addSeries("Green histogram", green, 256);

        return histogramdataset;
    }

}

Answer 1

这是解决方案和图形图像的完整代码。现在半透明的颜色可以更清晰地看到每个直方图。

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Paint;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYBarPainter;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.statistics.HistogramDataset;
import org.jfree.data.xy.IntervalXYDataset;

public class HistogramFrame extends JFrame {

    static double[] red;
    static double[] green;
    static double[] blue;

    public HistogramFrame(String title, double[]     red, double[] green, double[] blue) {
        super(title);
        HistogramFrame.red = red;
        HistogramFrame.green = green;
        HistogramFrame.blue = blue;

        JFreeChart jfreechart = ChartFactory.createHistogram("Histograms combination red,blue,green", null, null, createDataset(), PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyplot = (XYPlot) jfreechart.getPlot();
        xyplot.setForegroundAlpha(0.85F);
        XYBarRenderer xybarrenderer = (XYBarRenderer) xyplot.getRenderer();
        xybarrenderer.setBarPainter(new StandardXYBarPainter());
        //xybarrenderer.setDrawBarOutline(false);
        Paint[] paintArray = {              //code related to translucent colors begin here
            new Color(0x80ff0000, true),
            new Color(0x8000ff00, true),
            new Color(0x800000ff, true)
        };

        xyplot.setDrawingSupplier(new DefaultDrawingSupplier(
            paintArray,
            DefaultDrawingSupplier.DEFAULT_FILL_PAINT_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_OUTLINE_PAINT_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_STROKE_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_OUTLINE_STROKE_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_SHAPE_SEQUENCE));

        JPanel jpanel = new ChartPanel(jfreechart);
        jpanel.setPreferredSize(new Dimension(1000, 600));
        setContentPane(jpanel);
    }

    private static IntervalXYDataset createDataset() {
        HistogramDataset histogramdataset = new HistogramDataset();
        histogramdataset.addSeries("Red histogram", red, 256);
        histogramdataset.addSeries("Blue histogram", blue, 256);
        histogramdataset.addSeries("Green histogram", green, 256);

        return histogramdataset;
    }

}