动态更改JFreeChart直方图颜色？

Question

我正在尝试显示图像的直方图，并且仅显示一些颜色。 我已经使用JFreeChart和createXYLineChart做到了这一点，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”来实现。 我遵循了这段代码 。

为了使用新值更新图表，我使用了以下两种方法：

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

setHistogram是一种根据激活哪个复选框（布尔红色，绿色和蓝色）返回HistogramDataset的方法。

可以按预期正常工作。

我要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。 我按照与值大致相同的步骤进行操作：

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));
}

但是对于我所看到的，这仅在我第一次绘制代码时有效，而下一个不同系列的绘图将使用相同的颜色。 这是一个示例，RGB是它们应具有的颜色：[ 当我用红色更新时，绿色变为直方图，绿色变为蓝色：

有没有什么办法解决这一问题？

Answer 1

根据您的片段和此注释 ，您似乎正在尝试通过在复选框处理程序中的数据集中添加和删除序列来更改显示。 无需更改模型 ，而可以更改视图中系列的可见性。 在这种情况下，你可以给每个复选框的适当Action ，如这里及以下。 特别注意， VisibleAction使用与自定义DrawingSupplier中的相应颜色匹配的系列索引。

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 https://stackoverflow.com/q/40537278/230513
 * @see https://stackoverflow.com/q/11870416/230513
 * @see https://stackoverflow.com/a/28519356/230513
 */
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();
        });
    }
}