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

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。

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For our first simple effect, we will draw an alpha-blended (semitransparent) circle at a fixed position over the video stream. The first step is to add the drawing functions to the screen.c.

对于第一个简单效果，将在视频流中的固定位置绘制一个阿尔法混合(半透明的)圆。

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You get this alpha male effect, " Underhill says."

他说，“这样就会出现男性至上的效应。”

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You get this alpha male effect, " Underhill says."

他说，“这样就会出现男性至上的效应。”

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