动态更改 JFreeChart 直方图颜色？

Question

我正在尝试显示图像的直方图并且只显示一些颜色。我已经使用 JFreeChart 和 createXYLineChart 并通过遍历所有像素来获取所有数据。

为了加快速度，我尝试使用 "createHistogram" 来完成。我关注了 .

为了用新值更新图表，我使用了这两种方法：

XYPlot plot = (XYPlot) chart.getPlot();
plot.setDataset(setHistogram(red, green, blue));

作为 setHistogram 方法，returns 一个 HistogramDataset 取决于激活的复选框（布尔值红色、绿色和蓝色）。

按预期正常工作。

我必须做的第二件事是更新每个系列的颜色，否则它们将获得默认值。我或多或少遵循与值相同的过程：

private void setHistogramColors(boolean red, boolean green, boolean blue) {
    XYPlot plot = (XYPlot) chart.getPlot();
    XYBarRenderer renderer = (XYBarRenderer) plot.getRenderer();
    renderer.setBarPainter(new StandardXYBarPainter());
    Paint[] paintArray = null;
    if (red) {
        if (green) {
            if (blue) {
                paintArray = new Paint[3];
                paintArray[0] = new Color(0x80ff0000, true);// translucent red, green & blue
                paintArray[1] = new Color(0x8000ff00, true);
                paintArray[2] = new Color(0x800000ff, true);
            } else {
                paintArray = new Paint[2];
                paintArray[0] = new Color(0x80ff0000, true);
                paintArray[1] = new Color(0x8000ff00, true);
            }
        } else {
            paintArray = new Paint[1];
            paintArray[0] = new Color(0x80ff0000, true);
        }
    } else if (green) {
        if (blue) {
            paintArray = new Paint[2];
            paintArray[0] = new Color(0x8000ff00, true);
            paintArray[1] = new Color(0x800000ff, true);
        } else {
            paintArray = new Paint[1];
            paintArray[0] = new Color(0x8000ff00, true);
        }
    } else if (blue){
        paintArray = new Paint[1];
        paintArray[0] = new Color(0x800000ff, true);
    }
    else {
        return;
    }
    plot.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));
}

但据我所知，这仅在我第一次绘制代码时有效，并且不同系列的下一个图将采用相同的颜色。这是一个例子，RGB 是它们应该是的颜色： [ 当我更新为红色时，绿色直方图变为绿色直方图，绿色变为蓝色直方图：

有办法解决这个问题吗？

Answer 1

基于你的片段和这个, it looks like you are trying to change the display by adding and removing series from the dataset in your checkbox handlers. Instead of altering the model, change the visibility of a series in the view. In this case you can give each checkbox a suitable Action, as shown here and below. Note in particular that VisibleAction uses the series index that matches the corresponding color in the custom DrawingSupplier。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Paint;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.AbstractAction;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
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;

/**
 * @see 
 * @see 
 * @see 
 */
public class Histogram {

    private static final int BINS = 256;
    private final BufferedImage image = getImage();
    private HistogramDataset dataset;
    private XYBarRenderer renderer;

    private BufferedImage getImage() {
        try {
            return ImageIO.read(new URL(
                "http://i.imgur.com/kxXhIH1.jpg"));
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
        return null;
    }

    private ChartPanel createChartPanel() {
        // dataset
        dataset = new HistogramDataset();
        Raster raster = image.getRaster();
        final int w = image.getWidth();
        final int h = image.getHeight();
        double[] r = new double[w * h];
        r = raster.getSamples(0, 0, w, h, 0, r);
        dataset.addSeries("Red", r, BINS);
        r = raster.getSamples(0, 0, w, h, 1, r);
        dataset.addSeries("Green", r, BINS);
        r = raster.getSamples(0, 0, w, h, 2, r);
        dataset.addSeries("Blue", r, BINS);
        // chart
        JFreeChart chart = ChartFactory.createHistogram("Histogram", "Value",
            "Count", dataset, PlotOrientation.VERTICAL, true, true, false);
        XYPlot plot = (XYPlot) chart.getPlot();
        renderer = (XYBarRenderer) plot.getRenderer();
        renderer.setBarPainter(new StandardXYBarPainter());
        // translucent red, green & blue
        Paint[] paintArray = {
            new Color(0x80ff0000, true),
            new Color(0x8000ff00, true),
            new Color(0x800000ff, true)
        };
        plot.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));
        ChartPanel panel = new ChartPanel(chart);
        panel.setMouseWheelEnabled(true);
        return panel;
    }

    private JPanel createControlPanel() {
        JPanel panel = new JPanel();
        panel.add(new JCheckBox(new VisibleAction(0)));
        panel.add(new JCheckBox(new VisibleAction(1)));
        panel.add(new JCheckBox(new VisibleAction(2)));
        return panel;
    }

    private class VisibleAction extends AbstractAction {

        private final int i;

        public VisibleAction(int i) {
            this.i = i;
            this.putValue(NAME, (String) dataset.getSeriesKey(i));
            this.putValue(SELECTED_KEY, true);
            renderer.setSeriesVisible(i, true);
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            renderer.setSeriesVisible(i, !renderer.getSeriesVisible(i));
        }
    }

    private void display() {
        JFrame f = new JFrame("Histogram");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(createChartPanel());
        f.add(createControlPanel(), BorderLayout.SOUTH);
        f.add(new JLabel(new ImageIcon(image)), BorderLayout.WEST);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            new Histogram().display();
        });
    }
}

动态更改 JFreeChart 直方图颜色？

Change JFreeChart Histogram colors dynamically?

java

swing

colors

jfreechart

histogram