How to clone javafx.scene.image.Image?

问题

Is it possible to clone javafx.scene.image.Image, not using pixel by pixel copying? Or this is the only way?

回答1:

The code below copied from your link and put into a separate function is definitely not the "only" solution to the problem. It is definitely the best work-around that i personally know of. So here is the code for cut&paste:

copyImage

   /**
     * copy the given image to a writeable image
     * @param image
     * @return a writeable image
     */
    public static WritableImage copyImage(Image image) {
      int height=(int)image.getHeight();
      int width=(int)image.getWidth();
      PixelReader pixelReader=image.getPixelReader();
      WritableImage writableImage = new WritableImage(width,height);
      PixelWriter pixelWriter = writableImage.getPixelWriter();

      for (int y = 0; y < height; y++){
          for (int x = 0; x < width; x++){
              Color color = pixelReader.getColor(x, y);
              pixelWriter.setColor(x, y, color);
          }
      }
      return writableImage;
    }

Use in the context of an ImageView

If you have an ImageView that might have a readonly image this is how you get a copy "on the fly".

Platform.runLater() might be needed when calling the setImage ...

/**
 * get the writeAbleImage (if available)
 * 
 * @return the writeAbleImage or null if the image is not writeAble
 */
public WritableImage getWriteableImage() {
  if (image instanceof WritableImage) {
    return (WritableImage) image;
  } else {
    LOGGER.log(Level.INFO,"image is not writeable will create a writeable copy");
    WritableImage copyImage=copyImage(image);
    image=copyImage;
    imageView.setImage(image);
    return copyImage;
  }
}

回答2:

Late answer, you probably made it so far.

My solution to this topic is like that.

// First create a cache image
planTiles[1][1] = new PlanTile(1, 1, "");
ImageView cache = planTiles[1][1].renderImage();  // timeconsuming operation

// In loop, use cache: 
planTiles[iX][iY] = new PlanTile(iX, iY, "");
planTiles[iX][iY].setImage(cache.getImage());

回答3:

This is the solution:

writableImage = SwingFXUtils.toFXImage(SwingFXUtils.fromFXImage(sourceImage, null), null)

Full code:

public class JavaFXApplication extends Application {

@Override
public void start(Stage primaryStage) {

    Image sourceImage = new Image("http://goo.gl/kYEQl");
    ImageView imageView = new ImageView();
    imageView.setImage(sourceImage);
    ImageView destImageView = new ImageView();

    //copying sourceImage
    destImageView.setImage(SwingFXUtils.toFXImage(SwingFXUtils.fromFXImage(sourceImage, null), null));

    VBox vBox = new VBox();
    vBox.getChildren().addAll(imageView, destImageView);
    StackPane root = new StackPane();
    root.getChildren().add(vBox);
    Scene scene = new Scene(root, 300, 300);
    primaryStage.setTitle("java-buddy.blogspot.com");
    primaryStage.setScene(scene);
    primaryStage.show();
}

public static void main(String[] args) {
    launch(args);
}

}

来源：https://stackoverflow.com/questions/30021841/how-to-clone-javafx-scene-image-image

标签

javafx