C# NX二次开发：投影曲线和偏置曲线UFUN函数详解

大家好，今天要讲的是关于投影曲线和偏置曲线相关的函数。

（1）UF_CURVE_create_proj_curves1：这个函数的定义为创建投影曲线。

Defined in: uf_curve.h

Overview

Creates projection curves.

Objects to project may be points, curves, sketch feature identifiers, or

other projected curve feature identifiers. The "number of curves and

points" is the number of such object tags (and does not include the

numbers of curves in any sketch or projection curve feature).

For copy_flag=1 or 2, a group identifier is returned. You can perform

operations on the entire group or extract individual curves from the

group and operate on them.

CAUTION: Because multiple projection curves can be returned for

single defining curves, no attempt is made to assure that the order of

the output curves in the group corresponds to the order of the input

curves. If the order is important, for copy_flag = 1 or 2, the curves

should be projected one at a time.

NOTE: The Along Vector option (proj_type = 3) projects the selected

objects along a specified vector. You can project the curves in the

direction indicated by the vector by setting the multiplicity to 1

(single), or in both directions by setting the multiplicity to 2 (both).

The Along Vector option produces all possible images on the face.

CAUTION: For copy_flag = 2 (move), new curves/points are created

and the original curves/points are deleted.

For a projected curve feature created using copy_flag=3, the feature

can be deleted using UF_MODL_delete_feature. Individual projection

curves of the feature can not be deleted.

UF_MODL_move_feature can be used to move the projected curve feature.

Points can not be projected using "angle and vector" (proj_type = 4)

or "equal arc length" (proj_type =6).

NOTE: You can change the tolerance used to create a curve

projection by using the subroutine UF_MODL_set_distance_tolerance.

The projection along face normals or along a vector produces an exact

projection when projecting onto a plane.

Environment

Internal and External

History

Originally released in NX4.0

Required License(s)

( solid_modeling or drafting )

int UF_CURVE_create_proj_curves1

(

int n_curve_refs,

tag_t * curve_refs,

int n_face_refs,

tag_t * face_refs,

int copy_flag,

UF_CURVE_proj1_p_t proj_data,

tag_t * proj_curve_feature

)

|---------------------------------------------------------|--------------------|--------|------------------------------------------------------------------------------------------------|
| int | n_curve_refs | Input | Number of curves and points |
| tag_t * | curve_refs | Input | Array of curve and point identifiers. |
| int | n_face_refs | Input | Number of sheet bodies, faces and planes |
| tag_t * | face_refs | Input | Array of plane, datum plane, face or sheet body identifiers. |
| int | copy_flag | Input | Copy flag: 1 = copy 2 = move 3= associate |
| UF_CURVE_proj1_p_t | proj_data | Input | Pointer to projection curve data structure. See documentation of UF_CURVE_proj1_s for entries. |
| tag_t * | proj_curve_feature | Output | Group identifier for copy_flag = 1 or 2, Projected curve feature identifier for copy_flag=3 |

（2）UF_CURVE_create_offset_curve

Defined in: uf_curve.h

Overview

Offsets a string of curves (non-associative).

Environment

Internal and External