How can I make a JavaFX Canvas automatically resize to fit its parent container?

Automatically Resizing a Canvas Within Its Parent Container

When working with JavaFX, you may encounter the need to create an animated background or customized visual elements. The Canvas component provides a powerful way to draw and manipulate graphics. However, it is essential to ensure that your Canvas resizes automatically to fill its enclosing parent container as the window is resized. Achieving this can be a challenge, but there are effective approaches to address this requirement.

One approach is to leverage a custom wrapper class, such as the CanvasPane depicted in the code example. This class encapsulates a Canvas within a Pane and overrides the layoutChildren() method. This allows you to manipulate the dimensions of the Canvas so that they match the enclosing Pane. It's important to note that the Canvas itself cannot be resized directly by its parent due to its non-resizable nature. However, the Pane can be resized, which in turn affects the Canvas's dimensions.

By using this technique, you can ensure that your Canvas fills the available space within its parent container. The code example provided implements such a CanvasPane and demonstrates dynamic resizing, while leveraging an AnimationTimer for continuous rendering. The included controls allow you to toggle the animation and observe the Canvas's behavior as the Stage is resized.

This approach is particularly useful for creating dynamic and interactive backgrounds or any situation where the Canvas size must adapt to its surrounding environment. It empowers developers with greater flexibility to create visually engaging JavaFX applications.

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