例如，绘制圆形时，在中心点周围创建半径逐渐减少的阿尔法混合圆形可以获得优美的渐变效果。

For example, when drawing a circle, create decreasing radius and alpha-blended circles around the main point for a nice fade-out effect.

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每个程序码片段都会执行完整的程序设计工作，如建立自订例外状况、传送电子邮件讯息或绘制圆形。

Each snippet performs a complete programming task such as creating a custom exception, sending ane-mail message, or drawing a circle.

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圆形按直径从最大到最小绘制在上半部和下半部。

Circles are drawn in top and bottom halves, from largest diameter to smallest.

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