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//创建直径标注尺寸
tag_t CreatDrfDiameter(tag_t viewTag, tag_t objTag, double placementPos[3])
{
    UF_DRF_object_t    object;
    object.object_tag = objTag;
    object.object_view_tag = viewTag;
    object.object_assoc_type = UF_DRF_arc_center;
    object.object_assoc_modifier = 0;

    //定义附加文本
    UF_DRF_text_t drf_text;
    drf_text.user_dim_text  = NULL;
    drf_text.lines_app_text = 0;
    drf_text.appended_text  = NULL;

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    mpi[39] = 1;    //是否封闭箭头
    //mpi[55] = 25;    //左箭头颜色
    //mpi[56] = 25;    //右箭头颜色    
    mpr[48] = 0.1;    //符号与尺寸文本间隙

    UF_DRF_set_object_preferences(dimension_tag, mpi, mpr, rad, dia);  //设置制图参数

    return dimension_tag;
}