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函数说明：
?读取图案阴影数据归档开关。

函数参数：
第1个参数为输出：
on代表参数变量，logical * 为输出参数类型，阅读模式的阴影数据归档开关TRUE =开关已打开FALSE =开关关闭

UF_PATT_is_shading_on函数实例代码演示：
在下面的例子中的代码创建一个模式主零件文件，保存它，然后检索图形数据作为图形对象进另一部分。
[quote]
#include <stdio.h>
#include <uf.h>
#include <uf_defs.h>
#include <uf_curve.h>
#include <uf_part.h>
#include <uf_csys.h>
#include <uf_patt.h>
/* Prototype */
static void patt_example(void);
/* Sample funtion */
static void patt_example(void)
{
tag_t point_tag;
tag_t pat_master_tag;
tag_t parent_tag;
tag_t pat_tag;
tag_t circle_tag;
tag_t wcs;
UF_CURVE_arc_t circle;
logical on;
double pat_point[3] = { 0.0, 0.2, 0.0 };
double pat_data[13] = { 1.0, 0.0, 0.0, /* pattern object
orientation */
0.0, 1.0, 0.0, /* " " "
*/
0.0, 0.0, 1.0, /* " " "
*/
1.5, 1.5, 0.0, /* pattern object origin */
1.25}; /* pattern object scale */
UF_PATT_switch_t pat_marker = UF_PATT_on;
UF_PATT_switch_t pat_maxmin = UF_PATT_off;
UF_PATT_switch_t pat_control_pt = UF_PATT_on;
/* Create a pattern master part file */
UF_PART_new("patt_master", UF_PART_ENGLISH, &pat_master_tag);
/* Add geometry (a circle) */
circle.start_angle = 0.0;
circle.end_angle = 360.0 * DEGRA;
circle.arc_center[0] = 0.0;
circle.arc_center[1] = 0.0;
circle.arc_center[2] = 0.0;
circle.radius = 0.25;
UF_CSYS_ask_wcs(&wcs);
UF_CSYS_ask_matrix_of_object(wcs, &circle.matrix_tag);
UF_CURVE_create_arc(&circle, &circle_tag);
/* Create pattern point */
UF_PATT_create_point(pat_point, &point_tag);
/* Set up switches */
UF_PATT_set_archiving(UF_PATT_on);
UF_PATT_set_shading(UF_PATT_off);

/* Verify switches before saving */
UF_PATT_is_archiving_on(&on);
if (on)
printf("Pattern data archiving switch is on\n");
else
printf("Pattern data archiving switch is off\n");
UF_PATT_is_shading_on(&on);
if (on)
printf("Pattern shaed data archiving switch is on\n");
else
printf("Pattern shaded data archiving switch is off\n");
/* Save the pattern master part file */
UF_PART_save();
/* Create a parent part */
UF_PART_new("patt_parent", UF_PART_ENGLISH, &parent_tag);

/* Retrieve the pattern */
uc5823("patt_master", "", 1, pat_data, &pat_tag);
/* Set pattern diaply parameters */
UF_PATT_set_params(pat_tag, pat_marker, pat_maxmin,
pat_control_pt);
/* Read the parameters */
UF_PATT_ask_params(pat_tag, &pat_marker, &pat_maxmin,
&pat_control_pt);
if (pat_marker == UF_PATT_on)
printf("The pattern origin marker display is turned on\n");
else
printf("The pattern origin marker display is turned
off\n");

if (pat_maxmin == UF_PATT_on)
printf("The pattern's Max/Min box display is turned on\n");
else
printf("The pattern's Max/Min box display is turned
off\n");

if (pat_control_pt == UF_PATT_on)
printf("The pattern's control point display is turned
on\n");
else
printf("The pattern's control point display is turned
off\n");
}
/*ARGSUSED*/
void ufusr(char *param, int *retcode, int paramLen)
{
if (!UF_initialize())
{
patt_example();
UF_terminate();
}
}

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