Exporting JavaFX application as an animated GIF

import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javafx.animation.FadeTransition; import javafx.animation.Interpolator; import javafx.animation.ParallelTransition; import javafx.animation.RotateTransition; import javafx.animation.ScaleTransition; import javafx.animation.SequentialTransition; import javafx.animation.Transition; import javafx.application.Application; import javafx.scene.Node; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.CheckBox; import javafx.scene.control.Label; import javafx.scene.layout.HBox; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.scene.text.Font; import javafx.scene.text.FontPosture; import javafx.scene.text.FontWeight; import javafx.stage.Stage; import javafx.util.Duration;

/** * * @author william */ public class GifExporterTest extends Application {

Transition master;

@Override public void start(Stage stage) {

Label lblTarget = new Label("JavaFX"); StackPane spContainer = new StackPane(lblTarget); Button btnStart = new Button("Start"); Button btnStop = new Button("Stop"); CheckBox chkExport = new CheckBox("Export to gif"); VBox root = new VBox(10, spContainer, new HBox(30, btnStart, btnStop, chkExport));

spContainer.setPrefSize(300, 250); lblTarget.setFont(Font.font("Tahoma", FontWeight.BOLD, FontPosture.REGULAR, 40));

Scene scene = new Scene(root, 600, 500); createAnimations(lblTarget);

stage.setTitle("Hello World!"); stage.setScene(scene); stage.show();

btnStart.setOnAction(e -> { try { master.playFromStart(); if(chkExport.isSelected()) GitExporterFX.captureNow(spContainer, (int) master.getTotalDuration().toMillis(), "/home/wsiqueir/jfx2.gif", 100, true); } catch (IOException ex) { Logger.getLogger(GifExporterTest.class.getName()).log(Level.SEVERE, null, ex); } }); btnStop.setOnAction(e -> master.stop()); btnStart.disableProperty().bind(master.statusProperty().isEqualTo(Transition.Status.RUNNING)); }

void createAnimations(Node target) { Duration firstDuration = Duration.millis(2000); ScaleTransition st = new ScaleTransition(firstDuration, target); st.setFromX(0.1); st.setToX(1); st.setFromY(0.1); st.setToY(1); st.setInterpolator(Interpolator.LINEAR);

RotateTransition rt = new RotateTransition(firstDuration.divide(2), target); rt.setByAngle(360); rt.setInterpolator(Interpolator.LINEAR); rt.setCycleCount(2);

FadeTransition ft = new FadeTransition(Duration.millis(300), target); ft.setFromValue(1); ft.setToValue(0.1); ft.setCycleCount(2); ft.setAutoReverse(true);

ParallelTransition pt = new ParallelTransition(st, rt); master = new SequentialTransition(pt, ft); }

package org.jugvale;

import java.io.File; import java.io.IOException; import java.util.function.Consumer; import java.util.logging.Level; import java.util.logging.Logger; import javafx.animation.KeyFrame; import javafx.animation.Timeline; import javafx.embed.swing.SwingFXUtils; import javafx.event.Event; import javafx.scene.Parent; import javafx.scene.image.WritableImage; import javafx.util.Duration; import javax.imageio.stream.FileImageOutputStream; import javax.imageio.stream.ImageOutputStream;

/** * * @author william */ public class GitExporterFX {

public static void captureNow(Parent target, int durationInMilis, String outputDirectory, int timeBetweenFramesMS, boolean loopContinuously) throws IOException { ImageOutputStream output = new FileImageOutputStream(new File(outputDirectory)); final GifSequenceWriter gifWriter = new GifSequenceWriter(output, 3, timeBetweenFramesMS, loopContinuously); Consumer<Event> run = e -> { int w = (int) target.getBoundsInParent().getWidth(); int h = (int) target.getBoundsInParent().getHeight(); WritableImage img = new WritableImage(w, h); target.snapshot(null, img); try { gifWriter.writeToSequence(SwingFXUtils.fromFXImage(img, null)); } catch (IOException ex) { Logger.getLogger(GitExporterFX.class.getName()).log(Level.SEVERE, null, ex); } };

int keyFrameDuration = durationInMilis / (durationInMilis / timeBetweenFramesMS); final KeyFrame oneFrame = new KeyFrame(Duration.millis(keyFrameDuration), run::accept); Timeline t = new Timeline(durationInMilis, oneFrame); t.setCycleCount(durationInMilis / timeBetweenFramesMS); t.setOnFinished(e -> { try { gifWriter.close(); output.close(); } catch (IOException ex) { Logger.getLogger(GitExporterFX.class.getName()).log(Level.SEVERE, null, ex); } }); t.play(); } }