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函数说明：
定视图的标记，输出该视图是否是一个截面图。

函数参数：
第1个参数为输入：
view_tag代表参数变量，tag_t 为输入参数类型，看标签

第2个参数为输出：
is_a_sxview代表参数变量，logical * 为输出参数类型，如果为真，视图是截面图，否则不是。

UF_DRAW_is_sxview函数实例代码演示：
下面的示例检索有关的信息展开剖面线，然后创建一个类似的剖面线和视图。
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#include <stdio.h>
#include <uf.h>
#include <uf_defs.h>
#include <uf_draw.h>
#include <uf_draw_types.h>
#include <uf_drf_types.h>
#include <uf_obj.h>
void ufusr(char *param, int *retcod, int param_len)
{
int ifail = 0;
int num_sxviews;
int num_sxsegs;
int num_user_defined_sxsegs = 0;
int seg_ndx;
tag_t sxline1_tag;
tag_t pview_tag;
tag_t dwg_tag;
tag_t curve_tag;
tag_t new_sxview_tag;
tag_t * sxview_tags = NULL;
tag_t * sxseg_tags = NULL;
double step_dir[3];
double arrow_dir[3];
double view_placement_pt[2];
double sxview_scale = 1.0;
char error_message[133];
char * sxline1 = "unfolded_sxline1";
char dwg_name[MAX_FSPEC_SIZE +1];
char sxview_name[MAX_FSPEC_SIZE +1];
UF_DRAW_sxline_status_t sxline_status;
UF_DRAW_sxseg_info_t sxseg_info;
UF_DRF_object_p_t object;
UF_DRAW_sxline_sxsegs_t unfolded_sxsegs[99];
ifail = UF_initialize();
if( ifail == 0 )
/* Find the tag of the section line from its name. */
ifail = UF_OBJ_cycle_by_name( sxline1, &sxline1_tag );
if( ifail == 0 )
{
/* Retrieve information about an unfolded section line. */
ifail = UF_DRAW_ask_unfolded_sxline( sxline1_tag, step_dir,
arrow_dir, &pview_tag, &num_sxviews, &sxview_tags,
&num_sxsegs, &sxseg_tags, &sxline_status );
}
if( ifail == 0 )
{
/* Read current drawing name. */
ifail = uc6492( dwg_name );
}
if( ifail == 0 )
/* Get section view name from its tag. */
ifail = UF_OBJ_ask_name( sxview_tags[0], sxview_name );
if( ifail == 0 )
{
/* Find the drawing location of the section view. */
ifail = uc6483( dwg_name, sxview_name, view_placement_pt );
/* Move it slightly in the x direction. */
view_placement_pt[0] += 1.0;
}
if( ifail == 0 )
{
/* Get the section line segment information. */
for( seg_ndx = 0; seg_ndx < num_sxsegs; seg_ndx++ )
{
ifail = UF_DRAW_ask_sxline_sxseg( sxseg_tags[seg_ndx],
&sxseg_info, &curve_tag, &object );
if( ifail ) break;

/* Save only user defined sxsegs. */
if( sxseg_info.sxseg_mode == UF_DRAW_user_defined_sxseg
)
{
unfolded_sxsegs[num_user_defined_sxsegs].sxseg_type =
sxseg_info.sxseg_type;

unfolded_sxsegs[num_user_defined_sxsegs].sxseg_object=
object;
unfolded_sxsegs[num_user_defined_sxsegs].sxseg_angle
=
sxseg_info.sxseg_angle;
num_user_defined_sxsegs++;
}
else
UF_free( object );
}
}
if( ifail == 0 )
{
/* Get the current drawing tag. */
ifail = UF_DRAW_ask_current_drawing( &dwg_tag );
}
/* Create a similar unfolded section line. */
if( ifail == 0 )
{
ifail = UF_DRAW_create_unfolded_sxview( dwg_tag,
sxview_scale, step_dir, arrow_dir, pview_tag,
num_user_defined_sxsegs, unfolded_sxsegs,
view_placement_pt, &new_sxview_tag );
}
if( num_user_defined_sxsegs > 0 )
{
for( seg_ndx = 0; seg_ndx<num_user_defined_sxsegs;
seg_ndx++ )
{
/* Free each of the object structures. */
UF_free( (unfolded_sxsegs[seg_ndx].sxseg_object) );
}
}
UF_free( sxview_tags );
UF_free( sxseg_tags );
printf( "UF_DRAW_create_unfolded_sxview sample " );
if( ifail != 0 )
{
ifail = UF_get_fail_message( ifail, error_message );
printf( "fails.\nError is: %s\n", error_message );
}
else
printf( "is successful.\n" );
UF_terminate();
}

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