63. DisplacementMap

With DisplacementMap effect, we can move pixel in x or y.

Here motion is based on absolute function on the y-axis There is no x-displacement.

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package ex63;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.effect.DisplacementMap;
import javafx.scene.effect.FloatMap;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.stage.Stage;

public class Ex63 extends Application {

    @Override
    public void start(Stage stage) {
        Group root = new Group();

        FloatMap map = new FloatMap(250, 100);
        for (int i = 0; i < map.getWidth(); i++) {
            double value = -Math.abs(.002*(i-125));
            for (int j = 0; j < map.getHeight(); j++)
                map.setSamples(i, j, 0f, (float)value);
        }
        DisplacementMap displacementMap = new DisplacementMap(map);
        
        Label label = new Label("Displacement");
        label.setFont(Font.font("Georgia", 50));
        label.setPrefHeight(100);
        label.setLayoutX(55); label.setLayoutY(30);
        label.setEffect(displacementMap);
        
        root.getChildren().add(label);

        Scene scene = new Scene(root, 450, 200, Color.LIGHTYELLOW);
        stage.setTitle("Example 63. DisplacementMap");
        stage.setScene(scene);
        stage.show();
    }

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

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This is the output:

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