程序代码：

    public MyPanel( String path, int row, int col, int fw, int fh )
    {
        img = this.getToolkit().getImage(path);           /* load picture */          
    
        this.GetUnitSize();    
    }

        private void GetUnitSize()
     {
         this.sw = this.img.getWidth(this) / this.col;
         this.sh = this.img.getHeight(this) / this.row;
         System.out.println( sw + " " + sh );
     }