If you just want to save the image to disk you can simply do it on the same thread avoiding complication passing the image around. Something like this will work:
Platform.runLater {
val node = new Circle {
centerX = 200
centerY = 200
radius = 50
stroke = Color.BROWN
strokeWidth = 2
fill = Color.DARKKHAKI
}
val jfxImage = node.snapshot(new SnapshotParameters(), null)
val bufferedImage = SwingFXUtils.fromFXImage(jfxImage, null)
val file = new File("./snapshot.png")
println("Writing snapshot to: " + file.getAbsolutePath)
javax.imageio.ImageIO.write(bufferedImage, "png", file)
()
}
The empty ()
to have closure returning Unit, so ScalaFX Platform.runLater
is happy.
Update:
If you want to have a value from Platform.runLater
the approach you suggested in your question should be in general fine. However, you want to make sure that you do not block the FX Application Thread. If you call Platform.runLater
on FX Application Thread you will lock out, so you may want to have something like this
def makeSnapshot() = myNode.snapshot(new SnapshotParameters(), null)
val writableImg = if (Platform.isFxApplicationThread) {
makeSnapshot()
} else {
val futureTask = new FutureTask(new Callable[WritableImage]() {
override def call(): WritableImage = makeSnapshot()
})
Platform.runLater(futureTask)
futureTask.get()
}