UF_BREP_arc_s (查看源代码)
 
定义在: uf_brep_types.h
 
也被称为：
 
概述
Contains data defining an arc. The matrix defines an orientation thus: The
first 3 elements are the X axis of the orientation matrix in absolute
coordinates, the next 3 are the Y axis, and the last 3 are the Z axis. The
center defines the location of the arc in orientation space. The line
through the center parallel to the orientation X axis defines the zero
angle, zero being along the portion of the line from the center to the
positive X axis. The value start_angle must be in the interval [0,2pi) and
end_angle-start_angle <= 2pi.


Data Members

matrix_tag
tag_t （tag_t类型）
Rotation only; arc lies in matrix's X-Y plane

start_angle
double
Radian start angle with zero along positive
X-axis, with positive being CCW using right hand
rule.

end_angle
double
Radian end angle with zero along positive X-axis,
with positive being CCW using right hand rule.

arc_center [ 3 ]
double
Center with respect to the arc's coordinate
system

radius
double
The radius of the arc.