形状标注上方的JFreechart系列工具提示

2022-01-13 00:00:00 annotations series tooltip java jfreechart

我有一个 XYPlot，上面是系列和几个动态添加的形状注释，没有填充(因此每个系列点都是可见的).是否可以在注释上显示系列工具提示(显示鼠标指针当前指向的系列点的坐标)?或者如何重新排列元素以使工具提示可见.

I have an XYPlot on which are series and a couple of dynamically added shape annotations with no fill (hence each of the series points are visible). Is it possible to display the series tool tips(that show the coordinate of the series point over which the mouse pointer is currently pointing to) over the annotations? Or how can I re-arrange the elements in order to make the tooltip visible.

推荐答案

我怀疑您正在将形状注释添加到绘图中，它们是最后绘制的.相反，将它们添加到 Layer.BACKGROUND 中的渲染器.如下图所示，圆圈不会遮挡 (20, 20) 处的工具提示.还要注意 (10, 10) 是如何 不受线注释影响，而 (30, 30) 会被弧线遮挡.

I suspect you are adding the shape annotations to the plot, where they are drawn last. Instead, add them to the renderer in Layer.BACKGROUND. As shown below, the circle does not obscure the tool tip at (20, 20). Note also how (10, 10) is not affected by the line annotation, while (30, 30) is obscured by the arc.

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.util.Random;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.annotations.XYLineAnnotation;
import org.jfree.chart.annotations.XYShapeAnnotation;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.Layer;

/**
 * @see http://stackoverflow.com/questions/6797012
 * @see http://stackoverflow.com/questions/6604211
 */
public class ArcTest {

    private static final Random r = new Random();
    private static final Color blue = Color.blue;
    private static final BasicStroke stroke = new BasicStroke(2.0f);
    private static final double PI = 180d;
    private static final int X = 8;
    private static final int Y = 0;
    private static final int W = 6 * X;
    private static final int H = 3 * X;

    public static void main(String[] args) {
        JFreeChart chart = ChartFactory.createXYLineChart(
            "ArcTest", "X", "Y", createDataset(),
            PlotOrientation.VERTICAL, true, true, false);
        XYPlot plot = chart.getXYPlot();

        XYLineAndShapeRenderer renderer =
            (XYLineAndShapeRenderer) plot.getRenderer();
        renderer.setBaseShapesVisible(true);
        Ellipse2D.Double circle = new Ellipse2D.Double(X, X, 20, 20);
        renderer.addAnnotation(new XYShapeAnnotation(
            circle, stroke, blue), Layer.BACKGROUND);

        XYLineAnnotation line = new XYLineAnnotation(X, Y, X, H, stroke, blue);
        plot.addAnnotation(line);
        Arc2D.Double arc = new Arc2D.Double(X, Y, W, 2 * H, PI, PI, Arc2D.OPEN);
        plot.addAnnotation(new XYShapeAnnotation(arc, stroke, blue));

        ChartFrame frame = new ChartFrame("Test", chart);
        frame.pack();
        frame.setVisible(true);
    }

    private static XYDataset createDataset() {
        XYSeriesCollection result = new XYSeriesCollection();
        XYSeries series = new XYSeries("ArcTest");
        series.add(0, 0);
        series.add(10, 10);
        series.add(20, 20);
        series.add(30, 30);
        series.add(W, W);
        result.addSeries(series);
        return result;
    }
}

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