如何使用Batik获取坐标处的SVG节点

Question

我有一个 SVG 和点（例如 (x,y) = (250,112)）。 BATIK是否可以获取给定点的节点（DOM元素）？

Answer 1

我在由用户templth开发的batik用户论坛上找到了答案，我没有任何功劳，我只是在这里重新发布解决方案，这样它可以有更多的曝光。

public Element elementAtPosition(Document doc, Point2D point) {
    UserAgent userAgent = new UserAgentAdapter();
    DocumentLoader loader = new DocumentLoader(userAgent);
    BridgeContext context = new BridgeContext(userAgent, loader);
    context.setDynamicState(BridgeContext.DYNAMIC);
    GVTBuilder builder = new GVTBuilder();
    GraphicsNode rootGraphicsNode = builder.build(context, doc);

    // rootGraphicsNode can be offseted relative to coordinate system
    // that means calling this method on coordinates taken directly from the svg file might not work
    // check the bounds of rootGraphicsNode to determine where the elements actually are
    // System.out.println(rootGraphicsNode.getBounds());

    GraphicsNode graphicsNode = rootGraphicsNode.nodeHitAt(point);
    if (graphicsNode != null) {
        return context.getElement(graphicsNode);
    } else {
        // if graphicsNode is null there is no element at this position
        return null;
    }
}

在 Batik 1.9 上测试。此方法仅返回指定位置的最顶层元素。作为解决方法，您可以删除该元素并再次调用 nodeHitAt。

Answer 2

私有静态类 SVGMouseListener 实现 MouseListener {

private final JSVGCanvas svgCanvas;

public SVGMouseListener(JSVGCanvas jsvgCanvas) {
  this.svgCanvas = jsvgCanvas;
}

@Override
public void mouseClicked(MouseEvent e) {
  // Get the BridgeContext
  BridgeContext bridgeContext = svgCanvas.getUpdateManager().getBridgeContext();

  // Get the GraphicsNode at the SVG coordinates
  GraphicsNode gvtRoot = svgCanvas.getGraphicsNode();
  GraphicsNode svgNode = gvtRoot.nodeHitAt(new Point2D.Float(e.getX(), e.getY()));

  // Handle the element
  if (svgNode != null) {
    Element element = bridgeContext.getElement(svgNode);
    if (element != null) {
      System.out.println("Clicked on element with ID: " + element.getAttribute("id"));
    }
  }

}

您需要致电： svgCanvas.setDocumentState(JSVGComponent.ALWAYS_DYNAMIC); 否则 svgCanvas 的 UpdateManager 为 null。