清单5中显示了一些代码，这些代码先清除绘画，然后创建由一组矩形和椭圆组成的绘画。
The code to clear the drawing, then create the drawing as a set of rectangles and ellipses is shown in Listing 5.
现在使用椭圆选框工具创建一个圆形选区，如下图。
Now use the Elliptical Marquee Tool and create a circular selection as shown.
要创建其外圆，要创建一个近似正圆的椭圆。
To select the outer circle, create an elliptical selection around the circle.
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