填字游戏 用于渲染文本的2D画布，通常用于控制台应用程序。 val canvas = TextCanvas ( 40 , 8 ) canvas.write( 1 , 20 , " Such canvas " ) canvas.write( 6 , 30 , " Very 2D " ) canvas.write( 4 , 7 , " Much monospace " ) println (canvas)