Sub-pixel drawImage precision in Java

/*
 * SubpixelView.java
 */
package subpixel;

import com.sun.net.ssl.internal.ssl.Debug;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import org.jdesktop.application.SingleFrameApplication;
import org.jdesktop.application.FrameView;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JComponent;

/**
 * The application's main frame.
 */
public class SubpixelView extends FrameView {

    public SubpixelView(SingleFrameApplication app) {
        super(app);

        initComponents();

        /* create / add our component */
        SubPixelCanvas d = new SubPixelCanvas(0, 0, 200, 200);
        mainPanel.add(d);

        /* get ball image */
        try {
            d.image = ImageIO.read(new URL("http://icons.iconseeker.com/png/48/scrap/aqua-ball.png"));
        } catch (IOException ex) {  /* */ }

        /* start the threaded repaint */
        d.start();

    }

    class SubPixelCanvas extends JComponent implements Runnable {

        private Point2D.Float ball = new Point2D.Float(0, 0);
        private double width, height;
        private BufferedImage image, scene;
        public Graphics2D g2d;

        private SubPixelCanvas(int x, int y, int w, int h) {
            width = w;
            height = h;

            /* setup the memory image, which supports sub-pixel (double) precision */
            scene = new BufferedImage(w, h, 1);
            g2d = scene.createGraphics();
            g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            /* setup the ui component */
            this.setLocation(x, y);
            this.setSize(w, h);
        }

        /* overrides the paint method */
        @Override
        public void paint(Graphics g) {
            /* clear scene buffer */
            g2d.clearRect(0, 0, (int)width, (int)height);

            /* draw ball image to the memory image with transformed x/y double values */
            AffineTransform t = new AffineTransform();
            t.translate(ball.x, ball.y); // x/y set here
            t.scale(1, 1); // scale = 1
            g2d.drawImage(image, t, null);

            // draw the scene (double percision image) to the ui component
            g.drawImage(scene, 0, 0, this);
        }

        /* thread run function, all animation is done here */
        public void run() {
            double i = 0;
            int speed = 5;
            double maxX = width-image.getWidth();
            double maxY = height-image.getHeight();
            try {
                while(true) {
                while (i < maxX && i<maxY) {
                    ball.setLocation(i, i);
                    mainPanel.repaint();
                    i += 0.33;
                    Thread.sleep(speed);
                }
                while ((i -= 0.33) >0) {
                    ball.setLocation(i, i);
                    mainPanel.repaint();
                    Thread.sleep(speed);
                }
                }
            } catch (Exception ex) {
                Debug.println("...", ex.toString());
            }

        }

        private void start() {
            Thread t = new Thread(this);
            t.start();
        }
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        mainPanel = new javax.swing.JPanel();

        mainPanel.setName("mainPanel"); // NOI18N
        mainPanel.addComponentListener(new java.awt.event.ComponentAdapter() {
            public void componentShown(java.awt.event.ComponentEvent evt) {
                mainPanelComponentShown(evt);
            }
        });

        javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
        mainPanel.setLayout(mainPanelLayout);
        mainPanelLayout.setHorizontalGroup(
            mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        mainPanelLayout.setVerticalGroup(
            mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        setComponent(mainPanel);
    }// </editor-fold>

private void mainPanelComponentShown(java.awt.event.ComponentEvent evt) {
}
    // Variables declaration - do not modify
    private javax.swing.JPanel mainPanel;
    // End of variables declaration
}