JavaFX 3D - JavaFX 8: A Definitive Guide to Building Desktop, Mobile, and Embedded Java Clients - page 482

The program in Listing 10-13 demostrate the reading of the pixel colors from the EarthRise image that you saw in
Chapter 1.
Listing 10-13. The ImageOpsExample.java
import javafx.application.Application;
import javafx.geometry.BoundingBox;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextArea;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelReader;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class ImageOpsExample extends Application {
@Override
public void start(Stage stage) throws Exception {
stage.setTitle("Image Ops Example");
stage.setScene(makeScene());
stage.show();
}
private Scene makeScene() {
final String imageUrl = " http://projavafx.com/images/earthrise.jpg " ;
Image image = new Image(imageUrl);
final PixelReader pixelReader = image.getPixelReader();
ImageView imageView = new ImageView(image);
TextArea textArea = new TextArea();
textArea.setPrefSize(image.getWidth(), image.getHeight());
textArea.setText("Examining: " + imageUrl + "\n" +
"\tPixelFormat: " + pixelReader.getPixelFormat().getType() + "\n");
imageView.setOnMouseClicked(event -> {
final int x = (int) event.getX();
final int y = (int) event.getY();
final Color color = pixelReader.getColor(x, y);
final int argb = pixelReader.getArgb(x, y);
String pixelDescription = String.format(
"Pixel[%d, %d]:\n" +
"\t argb: %x\n" +
"\tcolor: %s (%5.4f, %5.4f, %5.4f, %5.4f)\n",
x, y, argb, color, color.getOpacity(),
color.getRed(), color.getGreen(), color.getBlue()
);
textArea.setText(textArea.getText() + pixelDescription);
});
HBox root = new HBox(10, imageView, textArea);