如何从不在现场的节点拍摄快照

问题描述：

是这种情况:

我在窗格中添加了Mesh和PointLight，我想从窗格中拍摄快照并在图像视图中显示结果.但这仅在将窗格添加到场景中时有效.

I have a Mesh and PointLight added to the pane and I want to take snapshot from pane and show the result in the image view. But it only works when I add the pane to the scene.

有什么方法可以从尚未添加到场景中的节点获取快照?

Is there any way to take snapshot from a node which has been not added to the scene?

答

根据

注意:为了使CSS和布局正确运行，该节点必须是Scene的一部分(该Scene可以附加到Stage上，但不一定要附加到此舞台上.)

NOTE: In order for CSS and layout to function correctly, the node must be part of a Scene (the Scene may be attached to a Stage, but need not be).

您可以创建新的场景而无需将其附加到舞台上甚至不显示它:

You can create new Scene without attaching it to Stage and even without displaying it:

WritableImage writableImage = new WritableImage(1000, 600);

// here is your node such as PointLight
new Circle(200, 200, 50).snapshot(null, writableImage);

new Scene(chartVH, 1000, 600);
chartVH.snapshot(null, writableImage);
File outFile = new File("/tmp/aa.png");
System.out.println(outFile);
try {
    ImageIO.write(SwingFXUtils.fromFXImage(writableImage, null), "png", outFile);
} catch (IOException e) {
    e.printStackTrace();
}

如何从不在现场的节点拍摄快照

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