Loom sample with continuation for a game

LoomGame

package kis.loom;

import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 * need Project Loom
 * http://mail.openjdk.java.net/pipermail/loom-dev/2018-July/000061.html
 */
public class LoomGame {
    public static void main(String[] args) throws InterruptedException {
        var image = new BufferedImage(400, 300, BufferedImage.TYPE_INT_RGB);
        
        var label = new JLabel(new ImageIcon(image));
        
        var f = new JFrame("Loom");
        f.add(label);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(500, 400);
        f.setVisible(true);

        var s1 = new ContinuationScope() {
            int x  = 30;
            int y = 50;

            void run() {
                for(;;) {
                    for (x = 30; x < 370; x += 3) {
                        Continuation.yield(this);
                    }
                    for (x = 370; x > 30; x -= 3) {
                        Continuation.yield(this);
                    }     
                }
            }
        };
        
        var s2 = new ContinuationScope() {
            int x = 200;
            int y = 30;
            void run() {
                for(;;) {
                    for (int i = 0; i < 360; ++i) {
                        Continuation.yield(this);
                        x = (int)(Math.cos(Math.PI * 2 * i / 360) * 120) + 200;
                        y = 150 - (int)(Math.sin(Math.PI * 2 * i / 360) * 120);
                    }
                }
            }
        };
        
        var c1 = new Continuation(s1, s1::run);
        var c2 = new Continuation(s2, s2::run);
        
        var g = image.createGraphics();
        for (;;) {
            g.setColor(Color.WHITE);
            g.fillRect(0, 0, 400, 300);
            
            c1.run();
            c2.run();

            g.setColor(Color.BLUE);
            g.fillRect(s1.x, s1.y, 30, 30);
            g.setColor(Color.RED);
            g.fillOval(s2.x, s2.y, 30, 30);
            
            label.repaint();
            Thread.sleep(50);
        }
    }
}