图说与标注排版：引线、图例与比例尺

Create a study of architectural drawing annotation, shown as a single well-annotated drawing. Show a simple building elevation or plan drawn in restrained line, deliberately plain, so the annotation itself becomes the subject. Detail the leader lines as thin, consistent in angle, all terminating in the same small dot at one end and a horizontal shoulder at the other, with the text sitting on the shoulder — never crossing another leader, never touching the drawing. Show the dimension strings with consistent tick marks, extension lines held clear of the object by a small gap, and figures placed above the line and centred. Detail a north arrow, a graphic scale bar with alternating black and white segments, a drawing title with a scale note beneath it, and a legend box listing three or four hatch patterns with their meanings. Keep the typography a single clean sans-serif at two sizes only. Flat technical drawing, black on white, disciplined and quiet, no photorealism.