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函数说明：
输出由一标记所指的平面区域的参数。

函数参数：
第1个参数为输入：
plane_zone代表参数变量，tag_t 为输入参数类型，带标签被查询。

第2个参数为输出：
输出char 字符类型的参数，参数的变量格式为name [ UF_OBJ_NAME_BUFSIZE ]，输出应被声明为字符缓冲区被查询[UF OBJ_NAME BUFSIZE]区名称

第3个参数为输出：
输出double 双精度类型的参数，参数的变量格式为origin [ 3 ]，区原点（绝对坐标。）

第4个参数为输出：
输出double 双精度类型的参数，参数的变量格式为matrix [ 9 ]，平面的方向。

UF_FLTR_ask_plane_zone函数实例代码演示：
在下面的例子中，代码创建一个框区域和平面区域。该代码还编辑创建的区域，以及有关它们的参数查询。
[quote]
#include <stdio.h>
#include <uf.h>
#include <uf_part.h>
#include <uf_fltr.h>
#define UF_CALL(X) (report( __FILE__, __LINE__, #X, (X)))
static void zone_function(void);
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)
{
zone_function();
}
/*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);
}
static void zone_function(void)
{
tag_t box_zone_tag;
tag_t plane_zone_tag;
tag_t part_tag;
tag_t displayed_part_tag;

int uf_stat=UF_FLTR_OK;
double centroid[3];
double corner[3];
double orientation[9];
double origin[3];
char name[30]="";
char newname[] = "newzonename";
/* open part file and create some zones */
printf("Creating part... \n");
UF_CALL(UF_PART_new("zone_example.prt",
2, /* english units = 2 */
&part_tag));
centroid[0] = 1.0;
centroid[1] = 2.0;
centroid[2] = 3.0;
corner[0] = 1.0;
corner[1] = 1.0;
corner[2] = 1.0;
orientation[0] = 1.0;
orientation[1] = 0.0;
orientation[2] = 0.0;
orientation[3] = 0.0;
orientation[4] = 1.0;
orientation[5] = 0.0;
orientation[6] = 0.0;
orientation[7] = 0.0;
orientation[8] = 1.0;
displayed_part_tag = UF_PART_ask_display_part();
/*********** Create Box Zone **************/
UF_CALL(UF_FLTR_create_box_zone(displayed_part_tag,
"ZONE_BOX1", centroid,
corner, orientation,
&box_zone_tag));
printf ("Created box zone 'ZONE_BOX1' \n:"
"Tag is %d status is %d\n ",
box_zone_tag, uf_stat );
/*********** Create plane Zone **************/
UF_CALL(UF_FLTR_create_plane_zone(displayed_part_tag,
"ZONE_PLANE1", origin,
orientation,
&plane_zone_tag));
printf ("Created plane zone 'ZONE_PLANE1': \n"
"Tag is %d status is %d\n ",
plane_zone_tag, uf_stat );
/*********** Modify Box Zone **************/
centroid[0] = -5.0;
centroid[1] = -10.0;
centroid[2] = -20.0;
corner[0] = 2.0;
corner[1] = 4.0;
corner[2] = 7.0;
orientation[0] = 0.5;
orientation[1] = 0.5;
orientation[2] = 0.5;
orientation[3] = 0.5;
orientation[4] = 0.5;
orientation[5] = 0.5;
orientation[6] = 0.5;
orientation[7] = 0.5;
orientation[8] = 0.5;
UF_CALL(UF_FLTR_edit_box_zone( box_zone_tag, newname,
centroid, corner,
orientation));
/*********** Modify plane Zone **************/
origin[0] = 10.0;
origin[1] = -20.0;
origin[2] = 30.0;
UF_CALL(UF_FLTR_edit_plane_zone(plane_zone_tag, newname,
origin, orientation));
/*********** Ask about zones *****************/
UF_CALL(UF_FLTR_ask_plane_zone( plane_zone_tag,
name, origin,
orientation));
UF_CALL(UF_FLTR_ask_box_zone( box_zone_tag, name,
centroid, corner,
orientation));
printf("\n New name: %s\n", name);

}

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