How can I `draw` something on a JavaFX WritableImage?

Question

I'm migrating a project from Swing to JavaFX, and I have a problem. Since java.awt.BufferedImage provides getGraphics and it has lots of convenient methods (like drawLine, drawImage, etc.), I have some codes that uses these features.

But in JavaFX' WritableImage, I can't find any similar methods.
Did I miss something? Or should I use something else instead of WritableImage?

Answer 1

You can use getGraphics in BufferedImage and do all the drawing job in the BufferedImage, and use SwingFXUtils.toFXImage to convert it into a WritableImage.

It's slow, and I have an alternative.

Draw everything on a Canvas, and use this:

override val screenCut get() =
  JvmImage(SwingFXUtils.fromFXImage(canvas.snapshot(
      SnapshotParameters(), null), null))

This will probably help.