如何在JMapViewer中向MapMarker添加工具提示 [英] How to add a ToolTip to MapMarker in JMapViewer

问题描述

我正在尝试将 ToolTip 添加到 JMapViewer 上的自定义 MapMarker 。但重复搜索并没有帮我解决这个问题。

I'm trying to add a ToolTip to a custom MapMarker on JMapViewer. But repeaded searches on are not helping me solve this.

自定义 MapMarker 是：

public class MapMarkerUnit extends MapObjectImpl implements MapMarker

和Paint Method overide是

and the Paint Method overide is

public void paint(Graphics g, Point position, int radio) {
    String filename = "marker.png";
    //System.out.print(filename);
    BufferedImage x = null;
    try {
        x = ImageIO.read(getClass().getResource(filename));
    } catch (IOException ex) {
        Logger.getLogger(MapMarkerUnit.class.getName()).log(Level.SEVERE, null, ex);
    }

    g.drawImage(x, position.x-16, position.y-37,null);

    //if(getLayer()==null||getLayer().isVisibleTexts()) paintText(g, new       Point(position.x+20,position.y));
}

感谢您提供的任何帮助。

Thanks for any help your able to offer.

推荐答案

覆盖 JMapViewer的 getToolTipText（）方法。在您的实现中，使用 getPosition（）将 MouseEvent 坐标转换为大地坐标。以下示例仅显示未格式化的坐标;你需要找到最近的 MapMarker 并返回相应的文字。

Override the getToolTipText() method of JMapViewer. In your implementation, use getPosition() to convert the MouseEvent coordinates into geodetic coordinates. The example below simply displays the unformatted coordinates; you'll want find the nearest MapMarker and return the appropriate text.

JMapViewer map = new JMapViewer() {

    @Override
    public String getToolTipText(MouseEvent e) {
        Coordinate c = getPosition(e.getX(), e.getY());
        return c.getLat() + " " + c.getLon();
    }
};
map.setToolTipText(""); // initialize 

附录：有没有办法直接向图像添加工具提示？

否; JMapViewer 是处理工具提示的封闭 JComponent 。

No; JMapViewer is the enclosing JComponent that handles tool tips.

我在地图上有大约50个标记......这是很多迭代。

你绝对无法在<$ c中加载图像$ c> MapMarker 实施;使用 SWingWorker 在后台加载图片，用于示例。

You definitely can't load images in your MapMarker implementation; use a SWingWorker to load images in the background, for example.

作为具体的迭代示例， JFreeChart 以这种方式轻松处理数十个实体的工具提示。这是封闭小组的 getToolTipText（） 实现，这里是循环调用 Shape＃contains（）。可以在此处查看说明该方法的简单示例。

As a concrete iteration example, JFreeChart easily handles tool tips for scores of entities in this way. Here's the enclosing panel's getToolTipText() implementation, and here's the loop that invokes Shape#contains(). A simplified example that illustrates the approach is seen here.

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