JavaFX Transparent Moveable Window

[vsquared]

The following source code will create a moveable transparent window with controls and graphics:

# https://docs.oracle.com/javase/8/javafx/api/javafx/stage/StageStyle.html
# https://medium.com/@keeptoo/making-a-borderless-javafx-window-movable-f7855eb33a51

# Uses Imported mode for py5

import javafx

_wndW = 400
_wndH = 400
xOffset = 0
yOffset = 0

def myBtnAction(event):
  global stage
  stage.close()

def pressedHandler(event):
  global stage,scene,xOffset,yOffset
  
  xOffset = event.getSceneX()
  yOffset = event.getSceneY()
  
def draggedHandler(event):
  global stage,xOffset,yOffset

  stage.setX(event.getScreenX()-xOffset)
  stage.setY(event.getScreenY()-yOffset)

def setup():
  global pane,stage,scene
  
  size(1, 1, FX2D)
  pane = javafx.scene.layout.Pane()
  stage = javafx.stage.Stage()
  scene = javafx.scene.Scene(pane,_wndW,_wndH)
# Button
  btn = javafx.scene.control.Button("Close")
  btn.setLayoutX(50)
  btn.setLayoutY(50)
  btn.setOnAction(myBtnAction)
  pane.getChildren().add(btn)
# Label
  label = javafx.scene.control.Label("Drag me")
  label.setLayoutX(150)
  label.setLayoutY(50)
  pane.getChildren().add(label)
# Rectangle
  r = javafx.scene.shape.Rectangle(50, 130, 100, 50)
  r.setStroke(javafx.scene.paint.Color.color(0.0, 1.0, 0.0, 0.95))
  r.setStrokeWidth(5)
  r.setArcWidth(15)
  r.setArcHeight(15)
  pane.getChildren().add(r);
  stage.setX(50)
  stage.setY(50)
  scene.setFill(None)
  scene.getRoot().setStyle("-fx-background-color: transparent")
  stage.initStyle(javafx.stage.StageStyle.TRANSPARENT);
  scene.getRoot().setOnMousePressed(pressedHandler)
  scene.getRoot().setOnMouseDragged(draggedHandler)
  stage.setScene(scene);
  stage.show()

[hx2A]

This is really cool! I love the idea of transparent windows. Now we need to figure out how to get the JavaFX drawing surface to be transparent. It would be really neat to be able to draw on a transparent canvas.

[vsquared]

Now we need to figure out how to get the JavaFX drawing surface to be transparent. It would be really neat to be able to draw on a transparent canvas.

I've tried that in java mode but whatever is placed in the window is transparent also. Transparent window with transparent object means the user sees either nothing or a very light colored object, depending on the opacity.