像素着色起计算从眼睛到被画矩形的光线。

The pixel shader computes a ray from the eye to the pixel being drawn on the quad.

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不像画矩形那样的直截了当，绘制路径是需要一些额外的步骤的。

To make shapes using paths, we need a couple of extra steps.

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详细说明：用C+ +语言实现的绘图程序，主要功能包括：画线、画圆、画矩形以及序列化等功能。- Using等功能。

C + + language to achieve the drawing program, the main functions include: drawing lines, drawing circles, drawing rectangle, as well as serialization and other functions.

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