Java-Buddy

package javafxpixel;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ProgressBar;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXPixel extends Application {
 
 final int TASK_MAX = 10000;
 Task task = new Task<Void>() {
 @Override
 protected Void call() throws Exception {
 for (int i=1; i <= TASK_MAX; i++) {
 updateProgress(i, TASK_MAX);
 
 Platform.runLater(new Runnable(){
 @Override
 public void run() {
 drawSomethingOnMyWritableImage();
 }
 });
 
 try {
 Thread.sleep(1);
 } catch (InterruptedException interrupted) {
 }
 }
 return null;
 }
 };
 
 WritableImage myWritableImage;
 PixelWriter myPixelWriter;
 final int IMG_WIDTH = 255;
 final int IMG_HEIGHT = 255;
 
 ProgressBar progressBar;
 Button startButton;
 
 @Override
 public void start(Stage primaryStage) {
 
 prepareMyWritableImage();
 
 ImageView myImage = new ImageView(); 
 myImage.setImage(myWritableImage);
 
 progressBar = new ProgressBar();
 progressBar.setPrefWidth(IMG_WIDTH);
 progressBar.progressProperty().bind(task.progressProperty());
 
 startButton = new Button("Start");
 
 VBox root = new VBox();
 root.getChildren().addAll(myImage, progressBar, startButton);
 
 Scene scene = new Scene(root, 300, 300);
 
 primaryStage.setTitle("java-buddy.blogspot.com");
 primaryStage.setScene(scene);
 primaryStage.show();
 
 
 
 startButton.setOnAction(new EventHandler<ActionEvent>() {
 @Override
 public void handle(ActionEvent event) {
 new Thread(task).start();
 }
 });
 }
 public static void main(String[] args) {
 launch(args);
 }
 
 private void prepareMyWritableImage(){
 
 myWritableImage = new WritableImage(IMG_WIDTH, IMG_HEIGHT);
 myPixelWriter = myWritableImage.getPixelWriter();
 
 //fill with background blue
 for(int x = 0; x < IMG_WIDTH; x++){
 for(int y = 0; y < IMG_HEIGHT; y++){
 myPixelWriter.setColor(x, y, Color.GRAY);
 }
 }
 }
 
 private void drawSomethingOnMyWritableImage(){
 
 int x = (int)(Math.random() * IMG_WIDTH);
 int y = (int)(Math.random() * IMG_HEIGHT);
 double r = Math.random();
 double g = Math.random();
 double b = Math.random();
 
 myPixelWriter.setColor(x, y, new Color(r, g, b, 1.0));
 }
}