我可以通过编程方式捕获场景快照吗? [英] Can I capture snapshot of scene programmatically?
问题描述
我有下面的代码可以正常工作..
I have the following code which works fine..
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Scene;
import javafx.scene.image.WritableImage;
import javafx.scene.web.WebView;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
/* User: koray@tugay.biz Date: 2017/05/23 */
public class CaptureScene {
public static void main(String[] args) throws IOException {
JFXPanel jfxPanel = new JFXPanel();
Platform.runLater(() -> {
WebView webView = new WebView();
webView.getEngine().load("file:///Users/koraytugay/Desktop/sample.html");
jfxPanel.setScene(new Scene(webView));
final JFrame jFrame = new JFrame();
jFrame.setLayout(new FlowLayout());
jFrame.getContentPane().add(jfxPanel);
final JButton saveAsImage = new JButton("Save as Image");
jFrame.getContentPane().add(saveAsImage);
saveAsImage.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Platform.runLater(new Runnable() {
@Override
public void run() {
final Scene scene = jfxPanel.getScene();
WritableImage image = scene.snapshot(new WritableImage(1920, 1080));
BufferedImage bufferedImage = SwingFXUtils.fromFXImage(image, null);
try {
ImageIO.write(bufferedImage, "png", new File("/Users/koraytugay/Desktop/vaaappp.png"));
} catch (IOException va) {
va.printStackTrace();
}
}
});
}
});
jFrame.setSize(1920, 1080);
jFrame.setVisible(true);
jFrame.requestFocus();
});
}
}
因此,当我运行此应用程序时,sample.html会很好地呈现,当我按下jframe上的按钮时,它会另存为图像.
so when I run this application, sample.html will be rendered fine and when I hit the button on the jframe, it will be saved as an image just fine.
但是,我不想打扰按钮,这就是我正在尝试的方法.
However, I do not want to bother hitting the button, and this is what I am trying..
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Scene;
import javafx.scene.image.WritableImage;
import javafx.scene.web.WebView;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
/* User: koray@tugay.biz Date: 2017/05/23 */
public class CaptureScene {
public static void main(String[] args) throws IOException {
JFXPanel jfxPanel = new JFXPanel();
Platform.runLater(() -> {
WebView webView = new WebView();
webView.getEngine().load("file:///Users/koraytugay/Desktop/sample.html");
jfxPanel.setScene(new Scene(webView));
final JFrame jFrame = new JFrame();
jFrame.setLayout(new FlowLayout());
jFrame.getContentPane().add(jfxPanel);
jFrame.setSize(1920, 1080);
jFrame.setVisible(true);
jFrame.requestFocus();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
Platform.runLater(new Runnable() {
@Override
public void run() {
final Scene scene = jfxPanel.getScene();
WritableImage image = scene.snapshot(new WritableImage(1920, 1080));
BufferedImage bufferedImage = SwingFXUtils.fromFXImage(image, null);
try {
ImageIO.write(bufferedImage, "png", new File("/Users/koraytugay/Desktop/baanb.png"));
} catch (IOException va) {
va.printStackTrace();
}
}
});
});
}
}
但是保存的图像只是空白的白色图像.我想念什么?基本上,我正在尝试将HTML网页另存为png,是否采用了错误的方法?我应该以其他方式执行此操作吗?实际上,这将在服务器端运行,所以也许JFrame还是无法正常工作?
But the saved image is just a blank white image. What am I missing? Basically, I am trying to save an html page as a png, am I taking a wrong approach? Should I do this with some other way? Actually, this will run on the server side so maybe JFrame will not work at all anyway?
推荐答案
向加载您的WebView
的WebEngine
持有的stateProperty
添加合适的侦听器.当工作程序的状态为SUCCEEDED
时,安排快照.从这个示例开始,字段webView
的snapshot()
产生显示的结果.
Add a suitable listener to the stateProperty
held by the WebEngine
that loads your WebView
. When the worker's state is SUCCEEDED
, schedule the snapshot. Starting from this example, a snapshot()
of the field webView
produces the result shown.
WebEngine webEngine = webView.getEngine();
Worker worker = webEngine.getLoadWorker();
worker.stateProperty().addListener((Observable o) -> {
if (worker.getState() == Worker.State.SUCCEEDED) {
Platform.runLater(new Runnable() {
@Override
public void run() {
WritableImage image = webView.snapshot(
new SnapshotParameters(), new WritableImage(800, 400));
BufferedImage bufferedImage = SwingFXUtils.fromFXImage(image, null);
try {
ImageIO.write(bufferedImage, "png", new File("image.png"));
} catch (IOException va) {
va.printStackTrace();
}
}
});
}
});
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