blm.java

//usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS info.picocli:picocli:4.2.0
//DEPS org.openjfx:javafx-base:11.0.2:${os.detected.jfxname}
//DEPS org.openjfx:javafx-graphics:11.0.2:${os.detected.jfxname}
//DEPS org.openjfx:javafx-controls:11.0.2:${os.detected.jfxname}

import javafx.animation.FadeTransition;
import javafx.animation.Interpolator;
import javafx.animation.Transition;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Labeled;
import javafx.scene.effect.MotionBlur;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyCombination;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.Shape;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextAlignment;
import javafx.stage.Stage;
import javafx.util.Duration;

public class blm extends Application{

    @Override
    public void start(Stage stage) throws Exception {
        Rectangle rect = new Rectangle(100,100);
        rect.setFill(Color.BLACK);
        Text blm = new Text("BLACK LIVES MATTER!");
        blm.setFill(Color.YELLOW);
        blm.setTextAlignment(TextAlignment.CENTER);

        StackPane root = new StackPane();
        root.getChildren().addAll(rect, blm);
        Scene scene = new Scene(root,500,250);
        rect.heightProperty().bind(scene.heightProperty());
        rect.widthProperty().bind(scene.widthProperty());

        int duaration = 5000;
        TextSizeTransition trans = new TextSizeTransition(blm, 10, 250,Duration.millis(duaration));

        FadeTransition fade = new FadeTransition();
        fade.setDuration(Duration.millis(duaration));
        fade.setFromValue(0);
        fade.setToValue(10);
        fade.setAutoReverse(true);
        fade.setNode(rect);

        fade.play();
        trans.play();

        //Configuring Group and Scene
        stage.setScene(scene);

        //primaryStage.setTitle("Translate Transition example");
        stage.setFullScreen(true);
        stage.setFullScreenExitHint("");
        stage.setFullScreenExitKeyCombination(KeyCombination.NO_MATCH);
        stage.addEventHandler(KeyEvent.KEY_RELEASED, (KeyEvent event) -> {
            if (KeyCode.ESCAPE == event.getCode()) {
                stage.close();
            }
        });
        stage.show();

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

class TextSizeTransition extends Transition {

    private Text UIcontrol; // a little generic -> subclasses: ButtonBase, Cell, Label, TitledPane
    private int start, end; // initial and final size of the text

    public TextSizeTransition(Text UIcontrol, int start, int end, Duration duration) {
        this.UIcontrol = UIcontrol;
        this.start = start;
        this.end = end - start; // minus start because of (end * frac) + start in interpolate()
        setCycleDuration(duration);
        //setInterpolator(Interpolator.EASE_IN);
        //setCycleCount(100);
        // and a lot of other methods
    }

    @Override
    protected void interpolate(double frac) {
        // frac value goes from 0 to 1
        // when frac is zero -> size is start
        // when frac is 1 -> size is end + start
        //(that's why we this.end = end - start; above to back to original end value)
        int size = (int) ((end * frac) + start);
        if(size<=end) {
            UIcontrol.setFont(Font.font(size));
        }else { // once the size reaches the destination (i.e. end value)
            // back to the start size if you want
            //UIcontrol.setFont(Font.font(start));
        }
    }
}