将会引用当前图形方位来绘制图形。
This method draws the image in the current graphics context, respecting the image's orientation setting.
然后在图像的中心绘制图形的主标题和子标题。
The main title and subtitle for the graph are then drawn in the center of the image.
在指定的矩形中绘制图形，并缩放到适应大小。
Draws the entire image in the specified rectangle, scaling it as needed to fit.
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