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Learn how to effectively add JavaFX shapes programmatically to a shared pane across multiple scenes in your JavaFX application.
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How to Dynamically Add JavaFX Shapes to a Shared Pane Through Its Controller Class

Creating a graphical application in JavaFX can be exciting, particularly when dealing with elements like nodes and edges in a graph. However, many developers face challenges when it comes to dynamically adding visual components, such as shapes, to a shared pane across multiple scenes. If you're struggling with this issue, you're in the right place!

In this guide, we'll discuss the problem you're facing and explore a solution that can help you successfully add JavaFX shapes—like circles and lines—to a shared AnchorPane from your controller class.

The Problem: Invisible Shapes on the Pane

In your application, you have multiple scenes, but you want a graph that consists of nodes (represented by Circle objects) and edges (represented by Line objects) to be displayed across these scenes. To do this, you created an AnchorPane in an FXML file and are trying to manage it through a single controller, but your shapes are not visible even though they appear to be added as children to the pane.

Here's a brief summary of what you experienced:

You confirmed that the shapes were being added to the AnchorPane via the controller.

Shapes that you added via Scene Builder appeared correctly, but those added in code did not.

As a test, you tried to add a simple Circle object from the controller, but it was still not visible in the GUI.

The Solution: Model and Viewer Classes

To resolve this issue and effectively manage the addition of shapes to your graph pane, you can create a model class and a viewer class. This separation of responsibilities simplifies the management of your graph's data and its visual representation.

Step 1: Create the Model Class

Create a class called GraphModel. This class will handle the graph's data, including the vertices (nodes) and edges. You can define methods to create and maintain these components:

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Step 2: Create the Viewer Class

Create a class called GraphView that extends javafx.scene.layout.Pane. This class will be responsible for displaying the graph and will have an AnchorPane to contain the graphical representation of the model.

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Step 3: Integrate Model and Viewer in Your Controller

In your GraphPaneController, you can now create instances of your GraphModel and GraphView, and link them accordingly.

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Conclusion

By implementing the model-view separation approach, you can effectively manage and display graphical components in a JavaFX application. The GraphModel class handles the graph's data, while the GraphView class is tasked with rendering the graphics on the shared pane. This design not only increases the maintainability of your code but also makes it easier to manage the visual output across multiple scenes.

If you keep these strategies in mind, you'll find it much simpler to dynamically add shapes to your shared panes and create complex visualizations in your JavaFX applications!