绘图区域的动态重新调整大小

Question

我写了一个程序，将GPS中的坐标打印到屏幕上作为散点。 这是代码：

class POSCanvas extends JPanel{
    int cnt = 1;
    private static final long serialVersionUID = 1L;
    List<Vector2D> pnts = new ArrayList<Vector2D>();

    public void getNewPoint (double xnew, double ynew){
        Vector2D pnt = new Vector2D(cnt*xnew, cnt*ynew);
        pnts.add(pnt);
        cnt++;
    }

    public void paintComponent(Graphics g){
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        if (!pnts.isEmpty()){
            super.paintComponent(g);
            g2.setColor(Color.white);
            Dimension size = getSize();
            Insets insets = getInsets();
            int w =  size.width - insets.left - insets.right;
            int h =  size.height - insets.top - insets.bottom;
            for (int i = 0; i < pnts.size(); i++ ){
                Ellipse2D.Double OV = new Ellipse2D.Double(pnts.get(i).getX() % w, size.height - pnts.get(i).getY() % h, 5, 5);
                g2.draw(OV);
                repaint();
            }
        }
    }

}

绘图的问题在于，当坐标较大时，绘图无意义的面板尺寸，绘图再次从左侧开始。这是一个例子：

我想动态调整面板的大小，以便坐标始终与其边界保持一致。我怎么能这样做？