您首先要画出正方形，然后再指定该显示窗口后面绘制图形的旋转操作。
You draw your square first, then specify the rotation operation that is applied to the subsequent shapes drawn to the display window.
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.
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.
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