This is my computer graphics curriculum design, realization of a simple drawing functions.

这是我的计算机图形学课程设计，实现了简单的画图功能。

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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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AS a platform for computer application, geometric drawing board is simple and convenient with great functions.

几何画板作为计算机应用平台，有功能强与简便等特点。

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