Pencil can also be used as a simple drawing program with standard design tools like pen, brush, paint bucket and more with an unlimited canvas space.

Pencil也可以被作为一个简单的图形设计工具，它有画笔、刷子、油漆桶和一个不限大小的画布。

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A pointed type implicit surface drawing algorithm with iterative function is provided to solve the default and its implementation is very simple and it is easy to program.

为了解决此缺点，提出了一种使用迭代函数系统的点式隐式曲面绘制算法，它的实现非常简单，易于编程。

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This algorithm can handle all kinds of complex sectional drawing and has many advantages. For example, its program is simple, rapid and fits microcomputer CAD system well etc.

可以处理各种复杂形状的剖面线图形，而且具有程序简单、使用方便、速度快、通用性强、便于扩充应用等优点，适合于在微型计算机上开发CAD系统应用。

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