如何將節點轉換爲javafx 2.1中的圖像？

Question

我正在使用Java FX，我想將節點轉換爲圖像。我找到了這個資源，但它並不能解決我的問題，因爲我想將節點轉換爲圖像，而不是整個場景。

How to output the content of a Scene graph in JavaFx 2.0 to an Image

Answer 1

這是我的問題的解決方案。這個解決方案是Sergey和jewelsea的幫助。這個解決方案是在javafx 2.2中。感謝Sergey和jewelsea。

public class TrySnapshot extends Application { 

javafx.embed.swing.SwingFXUtils fXUtils; 
BufferedImage bufferedImage = new BufferedImage(550, 400, BufferedImage.TYPE_INT_ARGB); 
File file = new File("C:/Users/PC1/Desktop/Sample Images/test.jpg"); 
VBox vbox = null; 

@Override 
public void start(Stage primaryStage) { 
    vbox = new VBox(); 
    Button btn = new Button(); 
    Image i = new Image("file:C:\\Koala.jpg"); 
    ImageView imageView = new ImageView(); 
    imageView.setImage(i); 
    vbox.getChildren().add(imageView); 
    vbox.setSpacing(10); 
    btn.setText("Say 'Hello World'"); 
    btn.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
     // here we make image from vbox and add it to scene, can be repeated :) 
     WritableImage snapshot = vbox.snapshot(new SnapshotParameters(), null); 
      vbox.getChildren().add(new ImageView(snapshot)); 
      saveImage(snapshot); 
      System.out.println(vbox.getChildren().size()); 
     } 
    }); 


    Scene scene = new Scene(new Group(btn), 500, 400); 

    primaryStage.setScene(scene); 
    primaryStage.show(); 
} 

private void saveImage(WritableImage snapshot) { 
    BufferedImage image; 
    image = javafx.embed.swing.SwingFXUtils.fromFXImage(snapshot, bufferedImage); 
    try { 
     Graphics2D gd = (Graphics2D) image.getGraphics(); 
     gd.translate(vbox.getWidth(), vbox.getHeight()); 
     ImageIO.write(image, "png", file); 
    } catch (IOException ex) { 
     Logger.getLogger(TrySnapshot.class.getName()).log(Level.SEVERE, null, ex); 
    }; 
    } 
} 

Answer 2

您可以使用新的FX 2.2快照功能：

public class TrySnapshot extends Application { 

    @Override 
    public void start(Stage primaryStage) { 
     final VBox vbox = new VBox(2); 
     final Button btn = new Button(); 
     vbox.getChildren().add(btn); 
     btn.setText("Say 'Hello World'"); 
     btn.setOnAction(new EventHandler<ActionEvent>() { 
      @Override 
      public void handle(ActionEvent event) { 
       // here we make image from vbox and add it to scene, can be repeated :) 
       WritableImage snapshot = vbox.snapshot(new SnapshotParameters(), null); 

       vbox.getChildren().add(new ImageView(snapshot)); 
       System.out.println(vbox.getChildren().size()); 
      } 
     }); 

     Scene scene = new Scene(new Group(vbox), 300, 250); 

     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

---

如果必須使用較舊的FX由於某種原因，只是改變場景座標到您的節點座標使用在Node#getBoundsInParent電話您鏈接的代碼示例。