Wie wechsle ich tick mark Etiketten auf die domain einer Anzahl Achse in JFreeChart?

Die Methode setVerticalTickLabels() kann eine alternative sein. Wenn nicht, sehe ich keine andere Wahl, als zu überschreiben refreshTicksHorizontal(). Siehe auch diese Beispiel.

import java.awt.Color;
import java.awt.Dimension;
import java.util.*;
import org.jfree.chart.*;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * @see https://stackoverflow.com/questions/7208657
 * @see https://stackoverflow.com/questions/7071057
 */
public class ScatterTickLabels extends ApplicationFrame {

    public ScatterTickLabels(String s) {
        super(s);
        final ChartPanel chartPanel = createDemoPanel();
        chartPanel.setPreferredSize(new Dimension(640, 480));
        this.add(chartPanel);
    }

    public static ChartPanel createDemoPanel() {
        JFreeChart jfreechart = ChartFactory.createScatterPlot(
            "Scatter Plot Demo", "X", "Y", samplexydataset(),
            PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        xyPlot.setDomainCrosshairVisible(true);
        xyPlot.setRangeCrosshairVisible(true);
        XYItemRenderer renderer = xyPlot.getRenderer();
        renderer.setSeriesPaint(0, Color.blue);
        NumberAxis domain = (NumberAxis) xyPlot.getDomainAxis();
        domain.setVerticalTickLabels(true);
        return new ChartPanel(jfreechart);
    }

    private static XYDataset samplexydataset() {
        int cols = 20;
        int rows = 20;
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("Random");
        Random rand = new Random();
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                double x = rand.nextGaussian();
                double y = rand.nextGaussian();
                series.add(x, y);
            }
        }
        xySeriesCollection.addSeries(series);
        return xySeriesCollection;
    }

    public static void main(String args[]) {
        ScatterTickLabels demo = new ScatterTickLabels("Scatter Plot Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }
}

Haben Sie Blick auf die super-Klasse: Achse.setLabelAngle(rad).

Und hier ist ein Beispiel.

BEARBEITEN: oben war nicht hilfreich, sorry.

Ich schaute auf den code der org.jfreechart.chart.Achse.NumberAxis.refreshTicksHorizontal. Es ist eigentlich ein Winkel, der ist auf 0.0 gesetzt (das Letzte argument in allen new NumberTick(...,0.0) Konstruktoren). Sie könnte eine Unterklasse von NumberAxis, der überschreibt die Methode refreshTicksHorizontal mit ein, die verwendet einen anderen Winkel (angegeben in Ihrem Konstruktor).

Sieht es aus wie refreshTicks wird immer aufgerufen, wenn das zeichnen des Graphen, so dass Sie nicht haben, um über sorgen, dass es nicht genannt.

/**
 * Calculates the positions of the tick labels for the axis, storing the
 * results in the tick label list (ready for drawing).
 *
 * @param g2  the graphics device.
 * @param dataArea  the area in which the data should be drawn.
 * @param edge  the location of the axis.
 *
 * @return A list of ticks.
 */
protected List refreshTicksHorizontal(Graphics2D g2,
        Rectangle2D dataArea, RectangleEdge edge) {

    List result = new java.util.ArrayList();

    Font tickLabelFont = getTickLabelFont();
    g2.setFont(tickLabelFont);

    if (isAutoTickUnitSelection()) {
        selectAutoTickUnit(g2, dataArea, edge);
    }

    TickUnit tu = getTickUnit();
    double size = tu.getSize();
    int count = calculateVisibleTickCount();
    double lowestTickValue = calculateLowestVisibleTickValue();

    if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
        int minorTickSpaces = getMinorTickCount();
        if (minorTickSpaces <= 0) {
            minorTickSpaces = tu.getMinorTickCount();
        }
        for (int minorTick = 1; minorTick < minorTickSpaces; minorTick++) {
            double minorTickValue = lowestTickValue 
                    - size * minorTick / minorTickSpaces;
            if (getRange().contains(minorTickValue)){
                result.add(new NumberTick(TickType.MINOR, minorTickValue,
                        "", TextAnchor.TOP_CENTER, TextAnchor.CENTER,
                        0.0));
            }
        }
        for (int i = 0; i < count; i++) {
            double currentTickValue = lowestTickValue + (i * size);
            String tickLabel;
            NumberFormat formatter = getNumberFormatOverride();
            if (formatter != null) {
                tickLabel = formatter.format(currentTickValue);
            }
            else {
                tickLabel = getTickUnit().valueToString(currentTickValue);
            }
            TextAnchor anchor = null;
            TextAnchor rotationAnchor = null;
            double angle = 0.0;
            if (isVerticalTickLabels()) {
                anchor = TextAnchor.CENTER_RIGHT;
                rotationAnchor = TextAnchor.CENTER_RIGHT;
                if (edge == RectangleEdge.TOP) {
                    angle = Math.PI / 2.0;
                }
                else {
                    angle = -Math.PI / 2.0;
                }
            }
            else {
                if (edge == RectangleEdge.TOP) {
                    anchor = TextAnchor.BOTTOM_CENTER;
                    rotationAnchor = TextAnchor.BOTTOM_CENTER;
                }
                else {
                    anchor = TextAnchor.TOP_CENTER;
                    rotationAnchor = TextAnchor.TOP_CENTER;
                }
            }

            Tick tick = new NumberTick(new Double(currentTickValue),
                    tickLabel, anchor, rotationAnchor, angle);
            result.add(tick);
            double nextTickValue = lowestTickValue + ((i + 1)* size);
            for (int minorTick = 1; minorTick < minorTickSpaces;
                    minorTick++) {
                double minorTickValue = currentTickValue
                        + (nextTickValue - currentTickValue)
                        * minorTick / minorTickSpaces;
                if (getRange().contains(minorTickValue)){
                    result.add(new NumberTick(TickType.MINOR,
                            minorTickValue, "", TextAnchor.TOP_CENTER,
                            TextAnchor.CENTER, 0.0));
                }
            }
        }
    }
    return result;

}