C#开发BIMFACE系列33 服务端API之模型对比4：获取模型对比结果

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　　模型对比可以对两个文件/模型进行差异性分析，确定两个文件/模型之间构件的几何和属性差异，包括增加的构件、删除的构件和修改的构件。模型对应可以用于进行文件/模型的版本对比。

几何对比

几何数据的对比的粒度为构件级，即只要构件的某一部分几何数据或材质发生改变，就认为整个构件发生变化。

几何差异，是指：文件A相对于文件B，到底在显示方面有哪些几何图形发生了变化。为了清晰描述几何差异，我们通过举例来详细说明：

假设文件A中，包含有5个构件，分别是：1、2、3、4、5；
假设文件A经过修改后，保存为文件B，其包含的构件为：2、3、4'、5、6、7。

通过对比，我们知道：文件B相对于文件A，删除了构件 1，新增了构件 6、7，修改构件4变成了构件4'。因此，经过对比计算，几何差异保留了如下信息：

删除的构件1；
修改构件中，修改前的构件4。

特别注意：在几何差异中，保留的是文件A相对于文件B的修改内容，因此，新增的构件6、7，和修改构件中修改后的构件4'，并没有包含在几何差异内。

属性对比

属性对比的粒度为构件的属性级，即对两个文件中的相同ID的构件挨个属性值进行对比。

变更构件指的是文件B相对于文件A新增、删除和修改的构件；变更的属性指的是构件修改前后，其属性值发生的变化。在对比完成之后，您可以调用2个服务端的API获取变更构件的列表，和修改前后发生变化的构件属性列表。

1. 获取模型对比结果

您可以调用服务端“获取模型对比结果”API，其返回的结果是一个列表，列表中详细列出了新增、删除、修改构件的ID和名称，并按照专业、类型进行了分组；

2. 获取修改构件属性差异

您可以调用服务端“获取修改构件属性差异”API，其返回的结果也是一个列表，仅针对修改的构件（不包含新增、删除的构件），是指对于一个修改过的构件ID，其修改前后分别新增、删除了哪些属性，或是属性值发生了变化。

如何显示模型对比结果的几何图形部分

完整显示文件B；
在此基础上显示几何差异；
隔离未变更的构件（如：半透明未变更的构件）；
对新增、删除、修改前后的构件进行着色。如下图，在界面中呈现的构件，应该表达为如下结果：

下面介绍BIMFACE提供的服务端API来获取模型对比的所有结果。

请求地址：GET https://api.bimface.com/data/v2/comparisons/{comparisonId}/diff

说明：分页获取模型对比结果

参数：

请求 path(示例)：https://api.bimface.com/data/v2/comparisons/1136906400211168/diff

请求 header(示例)："Authorization: Bearer dc671840-bacc-4dc5-a134-97c1918d664b"

HTTP响应示例(200)：

 1 {
 2   "code" : "success",
 3   "data" : {
 4     "data" : [ {
 5       "categoryId" : "-2001320",
 6       "categoryName" : "framework",
 7       "diffType" : "CHANGE",
 8       "elementId" : "296524",
 9       "elementName" : "250 x 600 mm",
10       "family" : "framework 1",
11       "followingFileId" : "1136893002033344",
12       "id" : "0213154515478",
13       "previousFileId" : "1136239003943104",
14       "specialty" : "civil"
15     } ],
16     "page" : 2,
17     "total" : 10
18   },
19   "message" : ""
20 }

特别说明

　　该接口是提供分页查询对比结果的。如果把参数 page(当前页面索引)设置为1，把参数 pageSize(每页记录数) 设置为 In32.MaxValue，即可一次性获取所有对比结果。

　　该接口默认每页记录数为50。

C#实现方法：

 1 /// <summary>
 2 /// 获取模型对比的所有结果
 3 /// </summary>
 4 /// <param name="accessToken">【必填】令牌</param>
 5 /// <param name="compareId">【必填】对比ID</param>
 6 /// <param name="elementName">构件名称</param>
 7 /// <param name="family">族名称</param>
 8 /// <returns></returns>
 9 public ModelCompareDiffResponse GetModelCompareDiffAll(string accessToken, long compareId, string elementName = "", string family = "")
10 {
11     return GetModelCompareDiff(accessToken, compareId, elementName, family, 1, Int32.MaxValue);
12 }

调用了分页查询的方法 GetModelCompareDiff()，实现如下：

 1 /// <summary>
 2 ///  分页获取模型对比结果
 3 /// </summary>
 4 /// <param name="accessToken">【必填】令牌</param>
 5 /// <param name="compareId">【必填】对比ID</param>
 6 /// <param name="elementName">构件名称</param>
 7 /// <param name="family">族名称</param>
 8 /// <param name="page">页码。默认第1页</param>
 9 /// <param name="pageSize">每页记录数。默认50</param>
10 /// <returns></returns>
11 public virtual ModelCompareDiffResponse GetModelCompareDiff(string accessToken, long compareId,
12                                                             string elementName = "", string family = "",
13                                                             int page = 1, int pageSize = 50)
14 {
15     // GET https://api.bimface.com/data/v2/comparisons/{comparisonId}/diff
16     string url = string.Format(BimfaceConstants.API_HOST + "/data/v2/comparisons/{0}/diff", compareId);
17     if (page <= 1)
18     {
19         page = 1;
20     }
21 
22     if (page <= 0)
23     {
24         page = 50;
25     }
26 
27     url += "?page=" + page;
28     url += "&pageSize=" + pageSize;
29 
30     if (elementName.IsNotNullAndWhiteSpace())
31     {
32         url += "&elementName=" + elementName;
33     }
34     if (family.IsNotNullAndWhiteSpace())
35     {
36         url += "&family=" + family;
37     }
38 
39     BimFaceHttpHeaders headers = new BimFaceHttpHeaders();
40     headers.AddOAuth2Header(accessToken);
41 
42     try
43     {
44         ModelCompareDiffResponse response;
45 
46         HttpManager httpManager = new HttpManager(headers);
47         HttpResult httpResult = httpManager.Get(url);
48         if (httpResult.Status == HttpResult.STATUS_SUCCESS)
49         {
50             response = httpResult.Text.DeserializeJsonToObject<ModelCompareDiffResponse>();
51         }
52         else
53         {
54             response = new ModelCompareDiffResponse
55             {
56                 Message = httpResult.RefText
57             };
58         }
59 
60         return response;
61     }
62     catch (Exception ex)
63     {
64         throw new Exception("[分页获取模型对比结果]发生异常！", ex);
65     }
66 }

方法的返回结果类ModelCompareDiffResponse如下：

 1 /// <summary>
 2 /// 分页获取模型对比结果的响应类
 3 /// </summary>
 4 public class ModelCompareDiffResponse : GeneralResponse<PaginationModelCompareDiff>
 5 {
 6 
 7 }
 8 
 9 public class PaginationModelCompareDiff
10 {
11     /// <summary>
12     /// 模型对比差异类数组
13     /// </summary>
14     [JsonProperty("data", NullValueHandling = NullValueHandling.Ignore)]
15     public ModelCompareDiff[] Data { get; set; }
16 
17     /// <summary>
18     ///  当前页码
19     /// </summary>
20     [JsonProperty("page", NullValueHandling = NullValueHandling.Ignore)]
21     public int Page { get; set; }
22 
23     /// <summary>
24     ///  总页数
25     /// </summary>
26     [JsonProperty("total", NullValueHandling = NullValueHandling.Ignore)]
27     public int Total { get; set; }
28 }
29 
30 /// <summary>
31 /// 模型对比差异类
32 /// </summary>
33 public class ModelCompareDiff
34 {
35     /// <summary>
36     ///  对比差异构件所属类别ID。样例 : "-2001320"
37     /// </summary>
38     [JsonProperty("categoryId", NullValueHandling = NullValueHandling.Ignore)]
39     public string CategoryId { get; set; }
40 
41     /// <summary>
42     ///  对比差异构件所属类别名称。样例 : "framework"
43     /// </summary>
44     [JsonProperty("categoryName", NullValueHandling = NullValueHandling.Ignore)]
45     public string CategoryName { get; set; }
46 
47     /// <summary>
48     ///  对比差异构件差异类型。 NEW、DELETE、CHANGE
49     /// </summary>
50     [JsonProperty("diffType", NullValueHandling = NullValueHandling.Ignore)]
51     public string DiffType { get; set; }
52 
53     /// <summary>
54     ///   对比差异构件ID。样例 : "296524"
55     /// </summary>
56     [JsonProperty("elementId", NullValueHandling = NullValueHandling.Ignore)]
57     public string ElementId { get; set; }
58 
59     /// <summary>
60     ///  对比差异构件名称
61     /// </summary>
62     [JsonProperty("elementName", NullValueHandling = NullValueHandling.Ignore)]
63     public string ElementName { get; set; }
64 
65     /// <summary>
66     ///  对比差异构件的族名称。样例 : "framework 1"
67     /// </summary>
68     [JsonProperty("family", NullValueHandling = NullValueHandling.Ignore)]
69     public string Family { get; set; }
70 
71     /// <summary>
72     ///  对比差异构件来源构件ID。样例 : "0213154515478"
73     /// </summary>
74     [JsonProperty("id", NullValueHandling = NullValueHandling.Ignore)]
75     public string Id { get; set; }
76 
77     /// <summary>
78     ///  对比差异构件变更文件ID，即(当前)变更后的文件ID。样例 : "1136893002033344"
79     /// </summary>
80     [JsonProperty("followingFileId", NullValueHandling = NullValueHandling.Ignore)]
81     public string FollowingFileId { get; set; }
82 
83     /// <summary>
84     /// 对比差异构件来源文件ID，即 (历史)变更前的文件ID。样例 : "0213154515478"
85     /// </summary>
86     [JsonProperty("previousFileId", NullValueHandling = NullValueHandling.Ignore)]
87     public string PreviousFileId { get; set; }
88 
89     /// <summary>
90     ///  对比差异构件所属专业。样例 : "civil"
91     /// </summary>
92     [JsonProperty("specialty", NullValueHandling = NullValueHandling.Ignore)]
93     public string Specialty { get; set; }
94 }

View Code

代码中使用的 HttpManager 类请参考我的博客文章《C# HTTP系列 HttpWebRequest 与 HttpWebResponse》。

测试

测试代码：

 1 /// <summary>
 2 ///  获取模型对比结果(所有)
 3 /// </summary>
 4 protected void btnGetModelCompareDiffAll_Click(object sender, EventArgs e)
 5 {
 6     txtResult.Text = string.Empty;
 7 
 8     long compareId = txtCompareID.Text.ToLong();
 9     IModelCompareApi api = new ModelCompareApi();
10     ModelCompareDiffResponse response = api.GetModelCompareDiffAll(txtAccessToken.Text, compareId);
11 
12     txtResult.Text = response.SerializeToJson(true);
13 }

测试结果：

该结果列表中详细列出了新增、删除、修改构件的ID和名称，并按照专业、类型进行了分组。完整的对比结果如下：

   1 {
   2   "code": "success",
   3   "message": null,
   4   "data": {
   5     "data": [
   6       {
   7         "categoryId": "-2001000",
   8         "categoryName": "橱柜",
   9         "diffType": "CHANGE",
  10         "elementId": "690286",
  11         "elementName": "4500_Kitchen Island",
  12         "family": "4500_Kitchen Island",
  13         "followingFileId": "1690406512149984",
  14         "previousFileId": "1690207922505184",
  15         "specialty": ""
  16       },
  17       {
  18         "categoryId": "-2001000",
  19         "categoryName": "橱柜",
  20         "diffType": "CHANGE",
  21         "elementId": "690080",
  22         "elementName": "4500_Kitchen Island_DW",
  23         "family": "4500_Kitchen Island_DW",
  24         "followingFileId": "1690406512149984",
  25         "previousFileId": "1690207922505184",
  26         "specialty": ""
  27       },
  28       {
  29         "categoryId": "-2000080",
  30         "categoryName": "家具",
  31         "diffType": "CHANGE",
  32         "elementId": "988128",
  33         "elementName": "Bar Chair",
  34         "family": "Bar Chair",
  35         "followingFileId": "1690406512149984",
  36         "previousFileId": "1690207922505184",
  37         "specialty": ""
  38       },
  39       {
  40         "categoryId": "-2000080",
  41         "categoryName": "家具",
  42         "diffType": "CHANGE",
  43         "elementId": "988396",
  44         "elementName": "Bar Chair",
  45         "family": "Bar Chair",
  46         "followingFileId": "1690406512149984",
  47         "previousFileId": "1690207922505184",
  48         "specialty": ""
  49       },
  50       {
  51         "categoryId": "-2000080",
  52         "categoryName": "家具",
  53         "diffType": "CHANGE",
  54         "elementId": "988459",
  55         "elementName": "Bar Chair",
  56         "family": "Bar Chair",
  57         "followingFileId": "1690406512149984",
  58         "previousFileId": "1690207922505184",
  59         "specialty": ""
  60       },
  61       {
  62         "categoryId": "-2000080",
  63         "categoryName": "家具",
  64         "diffType": "CHANGE",
  65         "elementId": "988462",
  66         "elementName": "Bar Chair",
  67         "family": "Bar Chair",
  68         "followingFileId": "1690406512149984",
  69         "previousFileId": "1690207922505184",
  70         "specialty": ""
  71       },
  72       {
  73         "categoryId": "-2000080",
  74         "categoryName": "家具",
  75         "diffType": "CHANGE",
  76         "elementId": "988603",
  77         "elementName": "Bar Chair",
  78         "family": "Bar Chair",
  79         "followingFileId": "1690406512149984",
  80         "previousFileId": "1690207922505184",
  81         "specialty": ""
  82       },
  83       {
  84         "categoryId": "-2000080",
  85         "categoryName": "家具",
  86         "diffType": "CHANGE",
  87         "elementId": "988640",
  88         "elementName": "Bar Chair",
  89         "family": "Bar Chair",
  90         "followingFileId": "1690406512149984",
  91         "previousFileId": "1690207922505184",
  92         "specialty": ""
  93       },
  94       {
  95         "categoryId": "-2000080",
  96         "categoryName": "家具",
  97         "diffType": "CHANGE",
  98         "elementId": "984486",
  99         "elementName": "W1500XD400XH530",
 100         "family": "Cabinet 1",
 101         "followingFileId": "1690406512149984",
 102         "previousFileId": "1690207922505184",
 103         "specialty": ""
 104       },
 105       {
 106         "categoryId": "-2001160",
 107         "categoryName": "卫浴装置",
 108         "diffType": "CHANGE",
 109         "elementId": "778420",
 110         "elementName": "5000L 3500x900x1860",
 111         "family": "DC_Tankworks_PLM_5000L",
 112         "followingFileId": "1690406512149984",
 113         "previousFileId": "1690207922505184",
 114         "specialty": ""
 115       },
 116       {
 117         "categoryId": "-2001160",
 118         "categoryName": "卫浴装置",
 119         "diffType": "CHANGE",
 120         "elementId": "778575",
 121         "elementName": "5000L 3500x900x1860",
 122         "family": "DC_Tankworks_PLM_5000L",
 123         "followingFileId": "1690406512149984",
 124         "previousFileId": "1690207922505184",
 125         "specialty": ""
 126       },
 127       {
 128         "categoryId": "-2000080",
 129         "categoryName": "家具",
 130         "diffType": "CHANGE",
 131         "elementId": "990317",
 132         "elementName": "Dining Chair (3)",
 133         "family": "Dining Chair (3)",
 134         "followingFileId": "1690406512149984",
 135         "previousFileId": "1690207922505184",
 136         "specialty": ""
 137       },
 138       {
 139         "categoryId": "-2000080",
 140         "categoryName": "家具",
 141         "diffType": "CHANGE",
 142         "elementId": "990596",
 143         "elementName": "Dining Chair (3)",
 144         "family": "Dining Chair (3)",
 145         "followingFileId": "1690406512149984",
 146         "previousFileId": "1690207922505184",
 147         "specialty": ""
 148       },
 149       {
 150         "categoryId": "-2000080",
 151         "categoryName": "家具",
 152         "diffType": "CHANGE",
 153         "elementId": "990620",
 154         "elementName": "Dining Chair (3)",
 155         "family": "Dining Chair (3)",
 156         "followingFileId": "1690406512149984",
 157         "previousFileId": "1690207922505184",
 158         "specialty": ""
 159       },
 160       {
 161         "categoryId": "-2000080",
 162         "categoryName": "家具",
 163         "diffType": "CHANGE",
 164         "elementId": "990621",
 165         "elementName": "Dining Chair (3)",
 166         "family": "Dining Chair (3)",
 167         "followingFileId": "1690406512149984",
 168         "previousFileId": "1690207922505184",
 169         "specialty": ""
 170       },
 171       {
 172         "categoryId": "-2000080",
 173         "categoryName": "家具",
 174         "diffType": "CHANGE",
 175         "elementId": "990645",
 176         "elementName": "Dining Chair (3)",
 177         "family": "Dining Chair (3)",
 178         "followingFileId": "1690406512149984",
 179         "previousFileId": "1690207922505184",
 180         "specialty": ""
 181       },
 182       {
 183         "categoryId": "-2000080",
 184         "categoryName": "家具",
 185         "diffType": "CHANGE",
 186         "elementId": "990646",
 187         "elementName": "Dining Chair (3)",
 188         "family": "Dining Chair (3)",
 189         "followingFileId": "1690406512149984",
 190         "previousFileId": "1690207922505184",
 191         "specialty": ""
 192       },
 193       {
 194         "categoryId": "-2000080",
 195         "categoryName": "家具",
 196         "diffType": "CHANGE",
 197         "elementId": "990647",
 198         "elementName": "Dining Chair (3)",
 199         "family": "Dining Chair (3)",
 200         "followingFileId": "1690406512149984",
 201         "previousFileId": "1690207922505184",
 202         "specialty": ""
 203       },
 204       {
 205         "categoryId": "-2000080",
 206         "categoryName": "家具",
 207         "diffType": "CHANGE",
 208         "elementId": "990648",
 209         "elementName": "Dining Chair (3)",
 210         "family": "Dining Chair (3)",
 211         "followingFileId": "1690406512149984",
 212         "previousFileId": "1690207922505184",
 213         "specialty": ""
 214       },
 215       {
 216         "categoryId": "-2001160",
 217         "categoryName": "卫浴装置",
 218         "diffType": "CHANGE",
 219         "elementId": "698859",
 220         "elementName": "Standard",
 221         "family": "Lavatory-TOTO-Luminist_Rectangle_Vessel_LLT151",
 222         "followingFileId": "1690406512149984",
 223         "previousFileId": "1690207922505184",
 224         "specialty": ""
 225       },
 226       {
 227         "categoryId": "-2001160",
 228         "categoryName": "卫浴装置",
 229         "diffType": "CHANGE",
 230         "elementId": "936823",
 231         "elementName": "Standard",
 232         "family": "Lavatory-TOTO-Luminist_Rectangle_Vessel_LLT151",
 233         "followingFileId": "1690406512149984",
 234         "previousFileId": "1690207922505184",
 235         "specialty": ""
 236       },
 237       {
 238         "categoryId": "-2001160",
 239         "categoryName": "卫浴装置",
 240         "diffType": "CHANGE",
 241         "elementId": "937573",
 242         "elementName": "Standard",
 243         "family": "Lavatory-TOTO-Luminist_Rectangle_Vessel_LLT151",
 244         "followingFileId": "1690406512149984",
 245         "previousFileId": "1690207922505184",
 246         "specialty": ""
 247       },
 248       {
 249         "categoryId": "-2001160",
 250         "categoryName": "卫浴装置",
 251         "diffType": "CHANGE",
 252         "elementId": "938763",
 253         "elementName": "Standard",
 254         "family": "Lavatory-TOTO-Luminist_Rectangle_Vessel_LLT151",
 255         "followingFileId": "1690406512149984",
 256         "previousFileId": "1690207922505184",
 257         "specialty": ""
 258       },
 259       {
 260         "categoryId": "-2001330",
 261         "categoryName": "结构柱",
 262         "diffType": "CHANGE",
 263         "elementId": "414482",
 264         "elementName": "M_1000",
 265         "family": "M_Concrete-Round-Column with Drop Caps",
 266         "followingFileId": "1690406512149984",
 267         "previousFileId": "1690207922505184",
 268         "specialty": ""
 269       },
 270       {
 271         "categoryId": "-2001300",
 272         "categoryName": "结构基础",
 273         "diffType": "CHANGE",
 274         "elementId": "512277",
 275         "elementName": "600 x 600 x 900mm",
 276         "family": "M_Pile Cap-600 Pile",
 277         "followingFileId": "1690406512149984",
 278         "previousFileId": "1690207922505184",
 279         "specialty": ""
 280       },
 281       {
 282         "categoryId": "-2001300",
 283         "categoryName": "结构基础",
 284         "diffType": "CHANGE",
 285         "elementId": "512297",
 286         "elementName": "600 x 600 x 900mm",
 287         "family": "M_Pile Cap-600 Pile",
 288         "followingFileId": "1690406512149984",
 289         "previousFileId": "1690207922505184",
 290         "specialty": ""
 291       },
 292       {
 293         "categoryId": "-2001300",
 294         "categoryName": "结构基础",
 295         "diffType": "CHANGE",
 296         "elementId": "512319",
 297         "elementName": "600 x 600 x 900mm",
 298         "family": "M_Pile Cap-600 Pile",
 299         "followingFileId": "1690406512149984",
 300         "previousFileId": "1690207922505184",
 301         "specialty": ""
 302       },
 303       {
 304         "categoryId": "-2001300",
 305         "categoryName": "结构基础",
 306         "diffType": "CHANGE",
 307         "elementId": "512394",
 308         "elementName": "600 x 600 x 900mm",
 309         "family": "M_Pile Cap-600 Pile",
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