javafx-8 - 如何从不在现场的节点拍摄快照

Question

情况是这样的:

我有一个 Mesh和 PointLight添加到 Pane 中，我想从 Pane 中获取快照并在 ImageView 中显示结果。但它仅在我将 Pane 添加到场景中时才有效。

有没有办法从没有添加到场景中的节点拍摄快照？

Answer 1

根据 Node.snapshot 的文档

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).

您可以在不将其附加到舞台甚至不显示它的情况下创建新场景:

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();
}