JFreeChart 的分层注释

Question

我正在尝试在 JFreeChart 上添加注释。目前注释出现在我的图表上方，但我希望它们出现在点下方。

xyPlot.addAnnotation(MECamVisArea, Layer.BACKGROUND);

当我输入这一行时，我收到一条错误消息，指出不兼容的类型图层无法转换为 Boolean。我将在下面留下我的完整注释代码。

XYPolygonAnnotation MECamVisArea = new XYPolygonAnnotation(new double[]{0.0, 0.0,
    defaultPosX, (defaultPosX*tan(0.907571)), defaultPosX, -(defaultPosX*tan(0.907571))}) {

    @Override
    public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea, ValueAxis
        domainAxis, ValueAxis rangeAxis, int rendererIndex, PlotRenderingInfo info) {
    Graphics2D g22 = (Graphics2D) g2.create();
    g22.setXORMode(new Color(0xff3300));
    super.draw(g22, plot, dataArea, domainAxis, rangeAxis, rendererIndex, info);
    }
};

xyPlot.addAnnotation(MECamVisArea, Layer.BACKGROUND);

Answer 1

如图所示 here, you are adding your XYPolygonAnnotation to an XYPlot, which offers an addAnnotation() method that expects a boolean parameter. Instead, add the annotation to your chosen XYItemRenderer, which offer an addAnnotation() 需要 org.jfree.ui.Layer 参数的方法。

JFreeChart 的分层注释

Layering annotations for JFreeChart

java

user-interface

annotations

jfreechart