Create ProcessingFX.pde

Add standalone sketch example from forum to library

Author: jeremydouglass

ProcessingFX.pde

@@ -0,0 +1,68 @@
+/**
+ * Stand-alone example of using an FXML file from a Processing .pde sketch.
+ * Does not rely on the ProcessingFX library.
+ * 
+ * Load a new scene from an FXML file and replace the the default scene Processing
+ * makes with this new one (during runtime).
+ *
+ * https://discourse.processing.org/t/fxml-file-integrate-in-processing/18325/10
+ */
+
+import java.util.Map;
+import java.nio.file.Paths;
+
+import javafx.application.Platform;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.scene.SceneAntialiasing;
+import javafx.scene.canvas.Canvas;
+import javafx.scene.layout.AnchorPane;
+import javafx.stage.Stage;
+
+import processing.javafx.PSurfaceFX;
+
+public void setup() {
+  size(800, 800, FX2D);
+  strokeWeight(3);
+}
+
+protected PSurface initSurface() {
+  surface = (PSurfaceFX) super.initSurface();
+  final Canvas canvas = (Canvas) surface.getNative();
+  final Scene oldScene = canvas.getScene();
+  final Stage stage = (Stage) oldScene.getWindow();
+
+  try {
+    FXMLLoader loader = new FXMLLoader(Paths.get("C:\\path--to--fxml\\stage.fxml").toUri().toURL()); // abs path to fxml file
+    final Parent sceneFromFXML = loader.load();
+    final Map<String, Object> namespace = loader.getNamespace();
+
+    final Scene newScene = new Scene(sceneFromFXML, stage.getWidth(), stage.getHeight(), false, 
+      SceneAntialiasing.BALANCED);
+    final AnchorPane pane = (AnchorPane) namespace.get("anchorPane"); // get element by fx:id
+
+    pane.getChildren().add(canvas); // processing to stackPane
+    canvas.widthProperty().bind(pane.widthProperty()); // bind canvas dimensions to pane
+    canvas.heightProperty().bind(pane.heightProperty()); // bind canvas dimensions to pane
+
+    Platform.runLater(new Runnable() {
+      @Override
+        public void run() {
+        stage.setScene(newScene);
+      }
+    }
+    );
+  } 
+  catch (IOException e) {
+    e.printStackTrace();
+  }
+  return surface;
+}
+
+public void draw() {
+  background(125, 125, 98);
+  ellipse(200, 200, 200, 200);
+  line(0, 0, width, height);
+  line(width, 0, 0, height);
+}