ValueMarker 标签被切割

Question

我正在用一些 ValueMarkers 做直方图，它在上侧被切掉了。我试图添加“\n”来降低它的位置，但我还是一样。如图所示：

这里有一个 MCVE 来说明这个问题。它需要一些图像（为简单起见，相同的图像）并显示直方图。它从那里放置了一些标记。为了便于每 50 个 bin 看到问题，但这并不重要。

package mcve;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Paint;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
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.ValueMarker;
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;

public class HistogramRAW {

private int BINS;
private Raster raster;//Load image
private String filename;
private RenderedImage image;

private JFreeChart chart; //Create histogram
private ChartPanel panel;
private HistogramDataset dataset;
private XYBarRenderer renderer;

private JFrame f; //Frame

public HistogramRAW(String filename) {
    this.filename = filename;
    this.BINS = 256;
}

private void getImage(String filename) {
    try {
        URL url = new URL(filename);
        final BufferedImage bi = ImageIO.read(url);
        raster = bi.getRaster();
        image = (RenderedImage) bi;

    } catch (IOException e) {
        e.printStackTrace(System.err);
        return;
    }
}

private ChartPanel createChartPanel() {
    // dataset
    dataset = new HistogramDataset();
    getImage(filename); //Put it here to get width and height from it
    final int w = image.getWidth();
    final int h = image.getHeight();

    double[] buffer = new double[w * h];

    //R
    buffer = raster.getSamples(0, 0, w, h, 0, buffer);
    dataset.addSeries("red", buffer, BINS);

    //G
    getImage(filename);
    buffer = raster.getSamples(0, 0, w, h, 0, buffer);
    dataset.addSeries("green", buffer, BINS);

    //B
    getImage(filename);
    buffer = raster.getSamples(0, 0, w, h, 0, buffer);
    dataset.addSeries("blue", buffer, BINS);

    //chart
    chart = ChartFactory.createHistogram("Histogram", "",
            "", dataset, PlotOrientation.VERTICAL, false, true, false);
    //Set colors
    XYPlot plot = (XYPlot) chart.getPlot();
    renderer = (XYBarRenderer) plot.getRenderer();
    renderer.setBarPainter(new StandardXYBarPainter());
    Paint[] paintArray = { // translucent red, green blue 
        new Color(0x800000ff, true),//blue
        new Color(0x8000ff00, true),//green
        new Color(0x80ff0000, true)//red
    };
    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));

    //Create panel with chart
    panel = new ChartPanel(chart);
    panel.setMouseWheelEnabled(true);

    return panel;
}

public void display() throws CloneNotSupportedException {
    f = new JFrame("Histogram");
    f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    f.add(createChartPanel(), BorderLayout.CENTER);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
}

private HistogramDataset updatedDataset() {
    // dataset
    HistogramDataset dataset = new HistogramDataset();
    getImage(filename); //Put it here to get width and height from it
    final int w = image.getWidth();
    final int h = image.getHeight();

    double[] buffer = new double[w * h];

    //R
    buffer = raster.getSamples(0, 0, w, h, 0, buffer);
    dataset.addSeries("red", buffer, BINS);

    //G
    getImage(filename);
    buffer = raster.getSamples(0, 0, w, h, 0, buffer);
    dataset.addSeries("green", buffer, BINS);

    //B
    getImage(filename);
    buffer = raster.getSamples(0, 0, w, h, 0, buffer);
    dataset.addSeries("blue", buffer, BINS);
    return dataset;
}

public void showMarkers() {
    XYPlot plot = (XYPlot) chart.getPlot();
    plot.clearDomainMarkers();

    int i = 0;
    while (i * 50 < 256) {
        ValueMarker marker = new ValueMarker(i * 50);
        marker.setLabel("\nEv +" + i);
        plot.addDomainMarker(marker);
        i++;
    }
}

public static void main(String[] args) {
    try {
        HistogramRAW hist = new HistogramRAW("https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Wikipedia-logo-v2.svg/245px-Wikipedia-logo-v2.svg.png");
        hist.display();
        hist.showMarkers();
    } catch (CloneNotSupportedException e) {
        e.printStackTrace();

    }
}
}

有什么方法可以解决这个问题，让它始终可见，而不是在外框下？非常感谢。

Answer 1

我可以通过添加这两个属性来解决它：

marker.setLabelAnchor(RectangleAnchor.TOP);
marker.setLabelTextAnchor(TextAnchor.TOP_LEFT);

ValueMarker 标签被切割

ValueMarker label is cut

java

swing

jfreechart

markers

visible