JFreechart系列工具提示上面的形状注释

我有一个XYPlot的系列和一些dynamic添加形状注释没有填充（因此，每个系列点是可见的）。 是否可以显示系列工具提示（显示鼠标指针当前指向的系列点的坐标）在注释上？ 或者我怎样才能重新安排的元素，以使工具提示可见。

Answer 1

我怀疑你正在添加形状注释的情节，他们最后绘制。 相反，将它们添加到Layer.BACKGROUND的渲染器。 如下图所示，圆圈不会遮挡（20,20）的刀尖。 还要注意（10,10）如何不受线条注释的影响，而（30,30）被弧线遮挡。

 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; } }