import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class ScrollablePicture extends JLabel implements Scrollable {

    private int maxUnitIncrement = 1;

    public ScrollablePicture(ImageIcon i, int m) {
	super(i);
	maxUnitIncrement = m;
    }

    public Dimension getPreferredScrollableViewportSize() {
	return getPreferredSize();
    }

    public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {

	int currentPosition = 0;
	if (orientation == SwingConstants.HORIZONTAL)
	    currentPosition = visibleRect.x;
	else
	    currentPosition = visibleRect.y;

	if (direction < 0) {
	    int newPosition = currentPosition - (currentPosition / maxUnitIncrement) * maxUnitIncrement;
	    return (newPosition == 0) ? maxUnitIncrement : newPosition;
	} else {
	    return ((currentPosition / maxUnitIncrement) + 1) * maxUnitIncrement - currentPosition;
	}
    }

    public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
	if (orientation == SwingConstants.HORIZONTAL)
	    return visibleRect.width - maxUnitIncrement;
	else
	    return visibleRect.height - maxUnitIncrement;
    }

    public boolean getScrollableTracksViewportWidth() {
	return false;
    }

    public boolean getScrollableTracksViewportHeight() {
	return false;
    }

    public void setMaxUnitIncrement(int pixels) {
	maxUnitIncrement = pixels;
    }
}