Even after waiting so many days, the Javafx bug team has not implemented this feature still in this new Javafx General Availability release . So I’ve managed to make blog about this function for javafx. Many javafx enterprises developer may think that javafx is still not useful because they don’t know how to save their graphics component in image format. Developer don’t have a simple api function like sceneToImage() which was provided in javafx script 1.3. Don’t know why ? We developers are that’s why intelligent to find the alternative way. So I also intended to research on this topic.Then started to warmup my hands on keyboard.
We are using some Java apis and JavaFX apis for making these things work. Ok Let’s get started with the class ‘FXImaging’
|
1 |
FXImaging.java |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 |
import java.awt.Container; import java.awt.Graphics; import java.awt.event.ActionListener; import java.awt.event.ComponentEvent; import java.awt.event.ComponentListener; import java.awt.image.BufferedImage; import java.io.File; import javafx.application.Platform; import javafx.collections.ObservableList; import javafx.embed.swing.JFXPanel; import javafx.geometry.BoundingBox; import javafx.geometry.Bounds; import javafx.scene.Group; import javafx.scene.Node; import javafx.scene.Scene; import javafx.stage.Stage; import javax.imageio.ImageIO; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.Timer; /** * * @author Narayan */ public class FXImaging{ /** * Some of the important private variables; */ private JFXPanel fxPanel; private int TIME = 200; private File file ; private JFrame frame; private BoundingBox boundbox; private Timer timer; private Stage stage; private Scene scene; private ObservableList list; private Node node; /** * * @param scene the scene which is to be imaged * @param save place where the image to be saved * @param width width of image * @param height height of image */ public void sceneToImage(final Scene scene,final File save,double width,double height){ stage = (Stage)scene.getWindow(); this.scene = scene; BoundingBox bound = null; if(width >0 && height >0){ bound = new BoundingBox(0,0,width,height); } initAndShowGUI(scene,save,bound); } /** * Overload function of sceneToImage * * @param scene * @param save */ public void sceneToImage(final Scene scene,final File save){ sceneToImage(scene,save,0,0); } /** * This function helps to save the Node to Image * and it's the only function which is public * * @param node node to be saved * @param list list of children where the node is kept * @param save place where the image to be saved */ public void nodeToImage(final Node node,final ObservableList list ,final File save){ nodeToImage(node,list,save,0,0); } /** * This function helps to save the Node to Image * and it's the only function which is public * * @param node the node to be saved * @param list the ObservableList of children where the node is kept * @param save place where the image to be saved * @param width width of image to be saved * @param height height of image to be saveed */ public void nodeToImage(final Node node,final ObservableList list,final File save,final double width, final double height){ stage = (Stage)node.getScene().getWindow(); scene = node.getScene(); this.node = node; this.list = list; BoundingBox bound = null; if(width > 0 && height > 0){ bound = new BoundingBox(0,0,width,height); } initAndShowGUI(node,save,bound); } /** * This is the main function to generate the graphics of the Node * using the FXPanel inside the JFrame. * @param node * @param f * @param bound */ private void initAndShowGUI(final Node node,File f, BoundingBox bound){ Group root = new Group(); Scene sc = new Scene(root); root.getChildren().add(node); initAndShowGUI(sc,f,bound); } /** * This is the main function to generate the graphics of the scene * using the FXPanel inside the JFrame. * * @param sc * @param f * @param bound */ private void initAndShowGUI(final Scene sc,File f,BoundingBox bound) { file= f; if(bound == null) boundbox = new BoundingBox(0,0,stage.getWidth(),stage.getHeight()) ; else boundbox = bound ; frame = new JFrame(); //Frame.setUndecorated(true); fxPanel = new JFXPanel(); fxPanel.setScene(sc); fxPanel.addComponentListener(new ComponentListener(){ public void componentResized(ComponentEvent e) { ActionListener ac = new ActionListener() { public void actionPerformed(java.awt.event.ActionEvent e) { save(fxPanel,boundbox, file ); timer.stop(); fxPanel.removeAll(); restore(); frame.dispose(); } }; //I've set timer for capturing image of the Node timer = new Timer(TIME, ac); timer.start(); } public void componentMoved(ComponentEvent e) { } public void componentShown(ComponentEvent e) { } public void componentHidden(ComponentEvent e) { } }); frame.add(fxPanel); frame.setSize((int)boundbox.getWidth(),(int)boundbox.getHeight()); if(stage !=null){ frame.setLocation((int)stage.getX(), (int)stage.getY()); Platform.runLater(new Runnable(){ public void run(){ stage.hide(); } }); } frame.setVisible(true); } /** * This function saves the container as FXPanel * to the Image using the Java API * @param container * @param bounds * @param file */ private void save(Container container, Bounds bounds, File file) { try { String extension = ""; String name = file.getName(); if(name.contains(".")){ int start= name.lastIndexOf("."); extension = file.getName().substring(start+1); } else{ extension = "jpg"; } ImageIO.write(toBufferedImage(container, bounds), extension, file); System.out.println("Node To Image saved"); } catch (java.lang.Exception exception) { exception.printStackTrace(); JOptionPane.showMessageDialog(null, "The image couldn't be saved","Error",JOptionPane.ERROR_MESSAGE); restore(); } } /** * Restoring the scene or Node to it's original state */ private void restore(){ if(node!=null){ restoreNode(); }else{ restoreScene(); } } /** * Restores the Node */ private void restoreNode(){ Platform.runLater(new Runnable(){ public void run(){ list.add(node); stage.show(); } }); } /** * This function restores the main Scene to the original Stage * from where the event has been triggered */ private void restoreScene(){ Platform.runLater(new Runnable(){ public void run(){ stage.setScene(scene); stage.show(); } }); } /** * This function is used to get the BufferedImage of the * Container as JFXPanel * @param container * @param bounds * @return */ private BufferedImage toBufferedImage(Container container, Bounds bounds) { BufferedImage bufferedImage = new BufferedImage( (int) bounds.getWidth(), (int) bounds.getHeight(), BufferedImage.TYPE_INT_ARGB); Graphics graphics = bufferedImage.getGraphics(); graphics.translate((int) -bounds.getMinX(), (int) -bounds.getMinY()); // translating to upper-left corner container.paint(graphics); graphics.dispose(); return bufferedImage; } } |
I’ve commented the codes so that you will understand the use of the function properly. In above class the nodeToImage(),sceneToImage() are the function which help to save your Node or Scene into Image format. The save() function helps to save your bufferedImage from JavaAPI. After saving the image the Node/Scene is being restored to the original stage from where the Node/Scene is being taken. The algorithm of saving Node/Scene is given in the picture below.
Now you can easily save your Node or Scene in the Image format. Below is one of the sample demo of saving the Scene into Image.
|
1 |
FXImagingTest.java |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 |
" ]public class FXImagingTest extends Application { private ObservableList<String> items; private ListView list; private VBox root; private Scene scene; /** * @param args the command line arguments */ public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage primaryStage) { primaryStage.setTitle("Hello World"); root = new VBox(); scene = new Scene(root, 400, 250); list = new ListView(); items = FXCollections.observableArrayList(); Button btn = new Button(); btn.setOnAction(new EventHandler<ActionEvent>(){ public void handle(ActionEvent event) { FXImaging imager = new FXImaging(); imager.nodeToImage(list,root.getChildren(),new File("c:/st.png")); } }); for(int i = 0; i<10; i++ ) { items.add("Item "+i+"1"); } list.setItems(items); root.getChildren().addAll(list,btn); primaryStage.setScene(scene); primaryStage.show(); } } |
Image of Node
Or if you want to make image of whole Scene then use this code:
|
1 |
imager.sceneToImage(scene,new File("c:/st.png")); |
Image of Scene
It has image like below
Thanks. for watching this blog. You can comment if you have any queries.
Have a good 🙂 day.
Hello! Cool works!
But is (will) any possibility to NOT use AWT and Swing?
As I can imagine, this layers bring additional requirements of time and memory?
Actually it’s just the hack for saving the Node or scene to Image format. The JavaFX team is working on this facility I think this facility will be available on coming version soon
Thanks.
Pingback: Java desktop links of the week, November 7 | Jonathan Giles
I’m impressed!!! Really informative blog post on blog.ngopal.com.np my friend. I just wanted to comment & say keep up the quality work.
It works excellently. Thank you!
You are welcome!! 🙂
Thank you friend. You are an excellent professional and very honest too.
Very nice one..!! Liked it a lot..!! Thank u very much use full to my project as well. Keep it up…, keep doing.
good
Great work!!!!
nice work.
can we send it to visitor’s browser for download without saving disk?
Yes we can send to browser for download as well, but I think you should make your own server and port for listening to the visitor’s computer and send file there by using HTTP headers rules.