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函数说明：
创建一个从获得的闭弦圈有界平面特性从终端到端曲线的字符串。外部或外围环形成片的边界。内闭环是在孔有界平面。您可以指定1或-1为DIR[]场因为方向s_section说法是不是这个显著常规由于闭合环路。选择的曲线必须是共面，链式，并形成一个封闭的形状。此功能自动确定回路的周边。 可以有只有一个外设循环。公差值，确定是否不是曲线是可链接和共面的。此输出功能是相关于特征的对象标识符。

函数参数：
第1个参数为输入：
s_section代表参数变量，UF_STRING_p_t 为输入参数类型，指针曲线列表结构。曲线串回路INT NUM总数（分= 1，最大值=150），INT的String []每曲线串环段曲线总数（分= 1，最大值=402）诠释的曲线串1的DIR[]方向=开始到结束-1=年底开始tag_t ID []部分曲线的标识符

第2个参数为输入：
输入double 双精度类型的参数，参数的变量格式为tol [ 3 ]，公差：[0]=距离[1]=角度（弧度）[2] =未使用（以前列为交叉口）

第3个参数为输出：
body_obj_id代表参数变量，tag_t * 为输出参数类型，车身对象标识符

UF_MODL_create_bplane函数实例代码演示：
打开C造型创建示例下面的代码创建一个平面界有三个内孔循环。因此，存在一个共有四个曲线串循环。该图下面示出了实施例的C程序的结果。图有界平面特性

[quote]

#include <stdio.h>
#include <string.h>
#include <uf.h>
#include <uf_modl.h>
#include <uf_curve.h>
#include <uf_part.h>
#include <uf_csys.h>

#define UF_CALL(X) (report( __FILE__, __LINE__, #X, (X)))

static int report( char *file, int line, char *call, int irc)
{
if (irc)
{
char messg[133];
printf("%s, line %d: %s\n", file, line, call);
(UF_get_fail_message(irc, messg)) ?
printf(" returned a %d\n", irc) :
printf(" returned error %d: %s\n", irc, messg);
}
return(irc);
}

static void do_ugopen_api(void)
{
/* bounded plane edge tolerance */
double tol[3];
/* data points for objects in loops */
static double points[45] = { 4.,-2.,0.,4.,4.,0.,-4.,4.,0.,-4.,
-4.,0.,0.,-2.,0.,-2.,3.,0.,-3.,3.,0.,-3.,2.,0.,
-2.,2.,0.,-2.,-1.,0.,2.,3.,0.,3.,3.,0.,3.,2.,0.,
2.,2.,0.,2.,3.,0.};
static double startang = 0.0;
static double endang = 6.28318530717958648;
static double arcrad = 1.0;
char prtnam[133];
int loops[4];
int numlps = 4;
int units =2;
int arc = 1;
int k, total;
tag_t bpobj;
tag_t part;
tag_t objarray1[4];
tag_t objarray2[3];
tag_t objarray3, wcs_tag;
tag_t objarray4[4];
UF_STRING_t generator;
UF_STRING_p_t ge = &generator;

UF_CURVE_line_t line1;
UF_CURVE_line_t line2;
UF_CURVE_line_t line3;
UF_CURVE_line_t line4;
UF_CURVE_line_t line5;
UF_CURVE_line_t line6;
UF_CURVE_line_t line7;
UF_CURVE_line_t line8;
UF_CURVE_line_t line9;
UF_CURVE_arc_t arc1;

line1.start_point[0] = points[3];
line1.start_point[1] = points[4];
line1.start_point[2] = points[5];
line1.end_point[0] = points[0];
line1.end_point[1] = points[1];
line1.end_point[2] = points[2];

line2.start_point[0] = points[6];
line2.start_point[1] = points[7];
line2.start_point[2] = points[8];
line2.end_point[0] = points[3];
line2.end_point[1] = points[4];
line2.end_point[2] = points[5];

line3.start_point[0] = points[9];
line3.start_point[1] = points[10];
line3.start_point[2] = points[11];
line3.end_point[0] = points[6];
line3.end_point[1] = points[7];
line3.end_point[2] = points[8];

line4.start_point[0] = points[15];
line4.start_point[1] = points[16];
line4.start_point[2] = points[17];
line4.end_point[0] = points[18];
line4.end_point[1] = points[19];
line4.end_point[2] = points[20];

line5.start_point[0] = points[18];
line5.start_point[1] = points[19];
line5.start_point[2] = points[20];
line5.end_point[0] = points[21];
line5.end_point[1] = points[22];
line5.end_point[2] = points[23];

line6.start_point[0] = points[30];
line6.start_point[1] = points[31];
line6.start_point[2] = points[32];
line6.end_point[0] = points[33];
line6.end_point[1] = points[34];
line6.end_point[2] = points[35];

line7.start_point[0] = points[33];
line7.start_point[1] = points[34];
line7.start_point[2] = points[35];
line7.end_point[0] = points[36];
line7.end_point[1] = points[37];
line7.end_point[2] = points[38];

line8.start_point[0] = points[36];
line8.start_point[1] = points[37];
line8.start_point[2] = points[38];
line8.end_point[0] = points[39];
line8.end_point[1] = points[40];
line8.end_point[2] = points[41];

line9.start_point[0] = points[39];
line9.start_point[1] = points[40];
line9.start_point[2] = points[41];
line9.end_point[0] = points[42];
line9.end_point[1] = points[43];
line9.end_point[2] = points[44];

arc1.start_angle = startang;
arc1.end_angle = endang;
arc1.arc_center[0] = points[27];
arc1.arc_center[1] = points[28];
arc1.arc_center[2] = points[29];
arc1.radius = arcrad;

strcpy(prtnam,"bplane");

UF_CALL(UF_PART_new(prtnam,units,&part));
UF_CALL(UF_CSYS_ask_wcs(&wcs_tag));
UF_CALL(UF_CSYS_ask_matrix_of_object(wcs_tag, &arc1.matrix_tag));

/* Create geometry for a bounded plane */
/* 1 peripheral loop and 3 hole loops */
/* Set up loop 1 - peripheral boundary - 3 lines and an arc */
loops[0] = 4;
UF_CALL(UF_CURVE_create_line(&line1, &objarray1[0]));
UF_CALL(UF_CURVE_create_line(&line2, &objarray1[1]));
UF_CALL(UF_CURVE_create_line(&line3, &objarray1[2]));
FTN(uf5063)(&arc, points, &points[12], &points[9],
&objarray1[3]);

/* Set up loop 2 - hole - 2 lines and an arc */
loops[1] = 3;
UF_CALL(UF_CURVE_create_line(&line4, &objarray2[0]));
UF_CALL(UF_CURVE_create_line(&line5, &objarray2[1]));
FTN(uf5063)(&arc, &points[21], &points[24], &points[15],
&objarray2[2]);

/* Set up loop 3 - hole - single arc */
loops[2] = 1;
UF_CALL(UF_CURVE_create_arc(&arc1, &objarray3));

/* Set up loop 4 - hole - 4 lines */
loops[3] = 4;
UF_CALL(UF_CURVE_create_line(&line6, &objarray4[0]));
UF_CALL(UF_CURVE_create_line(&line7, &objarray4[1]));
UF_CALL(UF_CURVE_create_line(&line8, &objarray4[2]));
UF_CALL(UF_CURVE_create_line(&line9, &objarray4[3]));
UF_MODL_init_string_list(ge);
UF_MODL_create_string_list(numlps,12,ge);

/* Store section loop data into string list structure. */
total = 0;
ge->string[0] = loops[0];
ge->dir[0] = 1;
for (k = 0; k < loops[0]; k++) ge->id[total++] = objarray1[k];
ge->string[1] = loops[1];
ge->dir[1] = -1;
for (k = 0; k < loops[1]; k++) ge->id[total++] = objarray2[k];
ge->string[2] = loops[2];
ge->dir[2] = 1;
ge->id[total++] = objarray3;
ge->string[3] = loops[3];
ge->dir[3] = -1;
for (k = 0; k < loops[3]; k++) ge->id[total++] = objarray4[k];
if (total != 12) printf("Error in total value!\n");
tol[0] = .001;
tol[1] = .5 * (PI/180);
tol[2] = .02;

/* Create a bounded plane */
UF_CALL(UF_MODL_create_bplane(ge,tol,&bpobj));
UF_MODL_free_string_list(ge);

}

/*ARGSUSED*/
void ufusr(char *param, int *retcode, int paramLen)
{
if (!UF_CALL(UF_initialize()))
{
do_ugopen_api();
UF_CALL(UF_terminate());
}
}

int ufusr_ask_unload(void)
{
return (UF_UNLOAD_IMMEDIATELY);
}

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