要设置在绘制形状时使用何种颜色，可以利用stroke函数。
To set the color that's used when drawing shapes, you use the stroke function.
写一系列的合适的函数组合，画出图4.2所示的形状。
Write an appropriately general set of functions that can draw shapes as in Figure 4.2.
提出一种确定形状描述函数的方法。
A new method of determining the function of describing shape was presented.
该形状可以是外壳及内部约束两者的函数。
The shape may be a function of both the housing and internal constraints.
该形状可以是外壳及内部约束两者的函数。
The shape may be a function of both the housing and internal constraints.
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