将窗格的快照保存为不同大小的文件

Question

除了pane_scene的原始大小之外，是否有办法将快照图像保存到磁盘的不同大小。我已经尝试了在网上找到的所有方法，包括为新快照设置参数，但我得到一个错误。如何更改下面的代码以1080 * 1080像素保存快照图像？非常感谢

public class Controller {
@FXML
private Pane pane_scene;
@FXML
private ImageView img;

    public void download()throws IOException {
        if (img.getImage() == null){
            Alert alert = new Alert(Alert.AlertType.INFORMATION);
            alert.setTitle("Note");
            alert.setHeaderText("Information");
            alert.setContentText("Please preview image first");
            alert.show();
        }
        else {
            FileChooser fileChooser = new FileChooser();
            fileChooser.setTitle("Save");
            fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("png", "*.png"));
            File file = fileChooser.showSaveDialog(new Stage());
            if (file != null){
                SnapshotParameters sp = new SnapshotParameters();
                WritableImage image = pane_scene.snapshot(sp,null);
                ImageIO.write(SwingFXUtils.fromFXImage(image,null), "png",file);
                System.out.println(file.getName());
            }
        }
    }
}

谢谢

Answer 1

我不确定您想要实现什么，但我正在使用以下技术创建渲染比例感知快照，我认为您可以在您的情况下执行类似的操作。诀窍是提供正确大小的图像并设置显式变换。

public static WritableImage renderScaleAwareSnapshot(Node node, double renderScale, WritableImage writableImage,
        double x, double y, double width, double height) {
    int renderWidth = (int) Math.rint(renderScale * width);
    int renderHeight = (int) Math.rint(renderScale * height);
    if (writableImage == null || (int) Math.rint(writableImage.getWidth()) != renderWidth
            || (int) Math.rint(writableImage.getHeight()) != renderHeight) {
        writableImage = new WritableImage(renderWidth, renderHeight);
    }
    SnapshotParameters spa = new SnapshotParameters();
    spa.setViewport(new Rectangle2D(x * renderScale, y * renderScale, width, height));
    spa.setTransform(Transform.scale(renderScale, renderScale));
    return node.snapshot(spa, writableImage);
}