private DSShape r, oldr;
	private int index;
	private double dx;
	private double dy;
	private double distx, disty;
	private Point2D c;

	/******************************************************************************
	 * We scale the shape by remembering the initial distance from the centre
	 * where the mouse was first pressed. We then scale by the ratio of the new
	 * distance to the centre to the old distance. To keep things simple, we
	 * keep a clone of the original shape and draw the changes relative to the
	 * original
	 *****************************************************************************/
	public void mousePressed(MouseEvent e) {
		r = canvas.getShapes().findShape(getPoint(e));
		if (r == null)
			return;
		canvas.select(r);
		oldr = (DSShape) r.clone();
		index = canvas.getShapes().indexOf(r);
		canvas.repaint();
		Point i = gridPoint(e);
		c = r.centre();
/******************************************************************************
 * Set them to at least 5 to avoid divide by zero errors
 *****************************************************************************/
		distx = Math.max(5, (i.getX() - c.getX()));
		disty = Math.max(5, (i.getY() - c.getY()));
	}

	public void mouseDragged(MouseEvent e) {
		if (r != null) {
			Point n = gridPoint(e);
			dx = (n.getX() - c.getX()) / (distx);
			dy = (n.getY() - c.getY()) / (disty);
			DSShape newr = (DSShape) oldr.clone();
			newr.scale(c, dx, dy);
			canvas.getShapes().set(index, newr);
			canvas.select(newr);
			canvas.repaint();
		}
	}

	public void mouseReleased(MouseEvent e) {
		if (r != null) {
			Point n = gridPoint(e);
			dx = (n.getX() - c.getX()) / (distx);
			dy = (n.getY() - c.getY()) / (disty);
			r.scale(c, dx, dy);
			canvas.repaint();
		}
	}