Object Arx 过滤器使用例子，计算选择的曲线面积和周长

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1. static AcDbObjectId LoadEntity(AcDbEntity* entity)
2. {
3. AcDbBlockTable* pBlockTable;
4. acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable,AcDb::kForRead);
7. AcDbBlockTableRecord* pBlockTableRecord;
8. pBlockTable->getAt(ACDB采用MODEL采用SPACE,pBlockTableRecord,AcDb::kForWrite);
13. AcDbObjectId Id;
14. pBlockTableRecord->appendAcDbEntity(Id,entity);
15. pBlockTable->close();
18. pBlockTableRecord->close();
19. entity->close();
20. return Id;
21. }
24. 是否是自由模式，返回样本实体所在的层（非自由选择模式）
25. static bool IsFreeMode(CString& strLayer)
26. {
27. 样本
28. ads采用name sName;
29. ads采用point sPt;
32. acedInitGet(RSG采用NONULL,采用T("F"));
33. int ret = acedEntSel(采用T("\n选择样本曲线[自由选择(F)]<回车自由选择>:"),sName,sPt);
34. bool isFree = false;是否自由选择
36. acutPrintf(采用T("ret is %d\n"),ret);
39. 只要没选实体，都是自由模式
40. if(ret == RTKWORD || ret == RTERROR)
41. {
42. /*CString kword ;
43. acedGetInput(kword.GetBuffer(1));
44. kword.ReleaseBuffer();
45. if(kword.CompareNoCase(采用T("F")) == 0)
46. {
47. isFree = true;
48. }*/
49. isFree = true;
50. }
51. else if(ret == RTNORM)
52. {
53. isFree = false;
54. AcDbObjectId entId;
55. if(Acad::eOk != acdbGetObjectId(entId,sName))
56. {
57. acutPrintf(采用T("\n获取样本实体ID失败"));
58. return isFree;
59. }
62. AcDbEntity* pEnt;
63. if(Acad::eOk != acdbOpenObject(pEnt,entId,AcDb::OpenMode::kForRead))
64. {
65. acutPrintf(采用T("\n打开样本实体失败"));
66. return isFree;
67. }
69. 获取层名称
70. strLayer = pEnt->layer();
73. pEnt->close();
74. }
75. return isFree;
76. }
79. static void GetAreaLen(double& sumLen,double& sumArea,long& lineNum,const int& mode)
80. {
81. CString strMode ;
84. bool isFree = false;
85. CString strLayer;
86. isFree = IsFreeMode(strLayer);
89. ads采用name ssName;
90. resbuf* strFilter = NULL;
91. 根据选择的模式构造过滤器字符串
92. if(isFree)
93. {
94. acutPrintf(采用T("\n您选择了自由模式\n"));
95. strFilter = acutBuildList(-4,采用T("<or"),
96. RTDXF0,采用T("LINE"),//直线
97. RTDXF0,采用T("ARC"),//圆弧
98. RTDXF0,采用T("LWPOLYLINE"),//轻量多段线
99. RTDXF0,采用T("POLYLINE"),//二维多段线
100. RTDXF0,采用T("SPLINE"),//样条曲线
101. RTDXF0,采用T("CIRCLE"),圆
102. RTDXF0,采用T("ELLIPSE"),圆
103. -4,采用T("or>"),RTNONE);
104. }
105. 加上样本曲线所在的层进行过滤
106. else
107. {
108. acutPrintf(采用T("\n您选择了样本模式"));
109. acutPrintf(采用T("\n根据图层%s进行过滤。"),strLayer);
112. strFilter = acutBuildList(-4,采用T("<and"),
113. -4,采用T("<or"),
114. RTDXF0,采用T("LINE"),//直线
115. RTDXF0,采用T("ARC"),//圆弧
116. RTDXF0,采用T("LWPOLYLINE"),//轻量多段线
117. RTDXF0,采用T("POLYLINE"),//二维多段线
118. RTDXF0,采用T("SPLINE"),//样条曲线
119. RTDXF0,采用T("CIRCLE"),圆
120. RTDXF0,采用T("ELLIPSE"),圆
121. -4,采用T("or>"),
122. 8,strLayer,样本所在的层名称
123. -4,采用T("and>"),
124. RTNONE);
125. }
127. if(mode == 1)计算长度
128. {
129. acutPrintf(采用T("\n选择要计算长度的曲线:"));
130. }
131. else
132. {
133. acutPrintf(采用T("\n选择要计算面积的曲线:"));
134. }
137. 根据过滤条件选择实体
138. if(acedSSGet(NULL,NULL,NULL,strFilter,ssName) != RTNORM)
139. {
140. acutPrintf(采用T("\n未找到符合条件的实体"));
141. return;
142. }
145. long len;
146. acedSSLength(ssName,&len);
147. lineNum = len;赋值实体数量
150. AcDbEntity* pEnt = NULL;
151. AcDbCurve*  pCur = NULL;
153. ads采用name en;每个实体名称
156. double param = 0.0;
157. double dist = 0.0;//长度
158. double area = 0.0;//面积
161. for(int i = 0;i < len; i++)
162. {
164. if(acedSSName(ssName,i,en) != RTNORM)
165. {
166. acutPrintf(采用T("\n获取第%d个实体名称出错"),i);
167. acutRelRb(strFilter);
168. acedSSFree(ssName);
169. return;
170. }
171. AcDbObjectId enId;
172. if(Acad::eOk != acdbGetObjectId(enId,en))
173. {
174. acutPrintf(采用T("\n获取第%d个实体ID出错"),i);
175. acutRelRb(strFilter);
176. acedSSFree(ssName);
177. return;
178. }
179. if(Acad::eOk != acdbOpenObject(pEnt,enId,AcDb::OpenMode::kForRead))
180. {
181. acutPrintf(采用T("\n获取第%d个实体ID出错"),i);
182. acutRelRb(strFilter);
183. acedSSFree(ssName);
184. return;
185. }
186. if(!pEnt->isKindOf(AcDbCurve::desc()))
187. {
188. acutPrintf(采用T("\n发现了不是曲线类型的实体，程序退出"));
189. pEnt->close();
190. acutRelRb(strFilter);
191. acedSSFree(ssName);
192. return;
193. }
196. pCur = (AcDbCurve*)pEnt;
198. pCur->getEndParam(param);
199. pCur->getDistAtParam(param,dist);
202. pCur->getArea(area);
205. sumLen += dist;
206. sumArea += area;
209. acutPrintf(采用T("\n第%d个曲线的长度是%.2f,面积是%.2f"),i,dist,area);
210. pCur->close();
211. }
214. acutRelRb(strFilter);
215. acedSSFree(ssName);
216. }
219. static void TESTsumarea()
220. {
223. double len = 0.0;
224. double area = 0.0;
225. long lineN = 0;
226. GetAreaLen(len,area,lineN,0);
227. acutPrintf(采用T("\n共选择:%ld个曲线，总面积:%.2f。"),lineN,area);
228. }
231. static void TESTsumlen()
232. {
235. double len = 0.0;
236. double area = 0.0;
237. long lineN = 0;
238. GetAreaLen(len,area,lineN,0);
239. acutPrintf(采用T("\n共选择:%ld个曲线，总长度:%.2f。"),lineN,len);
240. }

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