[JAVA][Beginning Java 8 Games Development]

Chapter 4 ■ An Introduction to JavaFX 8: Exploring the Capabilities of the Java 8 Multimedia Engine
Next, use the Run icon (or Run menu), and run the application. As Figure 4-5 illustrates, what you are trying to
achieve did not work: the window chrome elements are gone, and the transparency value is not evident.
Figure 4-5. Run the project to see if the Stage object is transparent; clearly, something is set to White
There must be something else in the processing pipeline that is not yet defining its background using the
transparency value. Transparency is defined using a hexadecimal value of #00000000, which signifies that all
AARRGGBB (alpha channel, red, green, blue) color and opacity values are turned off. You will need to start thinking
about the JavaFX components of your application as layers (currently, these are stage-scene-stackPane-button).
You will be learning about digital imaging concepts such as color depth, alpha channels, layers, blending, and all the
technical information that relates to processing pixels in a 2D plane as the book progresses.
The next thing you should try to set to this transparent value is the next level down in the JavaFX Scene Graph
hierarchy from the stage, which contains the Scene Graph itself. The next most top-level component, as discussed
previously, is the Scene object, which also has a background color value parameter or attribute.
Like the Stage class (object), the Scene class (object) does not have a style constant of TRANSPARENT, so you will
have to approach setting the Scene object’s background to a transparency value in a different way, using a different
method and constant. One thing you should know is that everything in JavaFX that writes itself to the screen will in
some way support transparency to allow multiple-layer compositing in JavaFX applications.
If you read the Scene class documentation, you will notice that there is a method, .setFill(Color value), that
takes a Color (class or object) value, so let’s try that next. As Figure 4-6 shows, I called the .setFill() off the Scene object
named scene, using a scene.setFill(Color.TRANSPARENT); statement, which NetBeans helps me construct!
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