JavaFX Image and ImageView Tutorial

1- JavaFX Image

JavaFX allows you to work with all popular image formats. Let's use class javafx.scene.image.Image to load images from hard drive or a network image sources. In order to display images on JavaFX, you use ImageView class.
The Constructors of class Image help you to load image data:
** Image **
Image(InputStream inputStream)

Image(InputStream is, double requestedWidth, double requestedHeight,
           boolean preserveRatio, boolean smooth)

Image(String url)

Image(String url, boolean backgroundLoading)

Image(String url, double requestedWidth, double requestedHeight,
            boolean preserveRatio, boolean smooth)

Image(String url, double requestedWidth, double requestedHeight,
            boolean preserveRatio, boolean smooth, boolean backgroundLoading)
Load images from URL:
String url = "http://somedomain/images/image.png";

boolean backgroundLoading = true;

// The image is being loaded in the background
Image image = new Image(url, backgroundLoading);
The most common is that you load an image on the hard drive.
// An image file on the hard drive.
File file = new File("C:/MyImages/myphoto.jpg");

// --> file:/C:/MyImages/myphoto.jpg
String localUrl = file.toURI().toURL().toString();

Image image = new Image(localUrl);
The images can be placed in a jar file or in a package of your Project. And you can use Image(InputStream) constructor to load it.
// MyClass is located in the same project with images,
// or in the same jar file with images.

Class<?> clazz = MyClass.class;

InputStream input = clazz.getResourceAsStream("/org/o7planning/javafx/icon/java-32.png");

Image image = new Image(input);

2- JavaFX ImageView

ImageView is a component which helps you to display images on JavaFX. You can also apply effects to display images such as rotate, zoom in and out,...
ImageViewDemo.java
package org.o7planning.javafx.image;

import java.io.InputStream;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class ImageViewDemo extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {

        Class<?> clazz = this.getClass();

        InputStream input = clazz.getResourceAsStream("/org/o7planning/javafx/icon/java-48.png");

        Image image = new Image(input);

        ImageView imageView = new ImageView(image);

        InputStream input2 = clazz.getResourceAsStream("/org/o7planning/javafx/icon/java-48.png");
        Image image2 = new Image(input2, 100, 200, false, true);
        ImageView imageView2 = new ImageView(image2);

        FlowPane root = new FlowPane();
        root.setPadding(new Insets(20));

        root.getChildren().addAll(imageView, imageView2);

        Scene scene = new Scene(root, 400, 200);

        primaryStage.setTitle("JavaFX ImageView (o7planning.org)");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

}

3- Rotate and Scale

ImageViewDemo2.java
package org.o7planning.javafx.image;

import java.io.InputStream;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class ImageViewDemo2 extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {

        Class<?> clazz = this.getClass();

        InputStream input = clazz.getResourceAsStream("/org/o7planning/javafx/icon/java-48.png");

        Image image = new Image(input);

        ImageView imageView = new ImageView(image);

        Button buttonRotate = new Button("Rotate");
        buttonRotate.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                double value = imageView.getRotate();
                imageView.setRotate(value + 30);
            }
        });
       
        Button buttonScale = new Button("Scale X * 2");
        buttonScale.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                imageView.setScaleX(2); ;
            }
        });

        FlowPane root = new FlowPane();
        root.setPadding(new Insets(20));
        root.setHgap(20);

        root.getChildren().addAll(buttonRotate,buttonScale, imageView);

        Scene scene = new Scene(root, 400, 200);

        primaryStage.setTitle("JavaFX ImageView (o7planning.org)");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

}