问一个UGOpen数据结构

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struct UF_EVAL_arc_s
Overview

Data Members
is_periodic
logical is_periodic
Is the curve periodic or not?

limits
double limits[ 2 ]
Curve limits: [0] = min; [1] = max

radius
double radius
Radius

center
double center[ 3 ]
Center (ABS coordinates)

x_axis
double x_axis[ 3 ]
Unit direction vector of the x axis (ABS)

y_axis
double y_axis[ 3 ]
Unit direction vector of the y axis (ABS)


有没有用过这个数据结构的？有用过这个数据结构的请帮忙解释一下各个数据成员的详细用途

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