c++ Arx二次开发创建多段线

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1. 4、c++ Arx二次开发创建多段线
2. 一、本节课程
3. c++ Arx二次开发创建多段线
5. 二、本节要讲解的知识点
6.    如何应用C++ ARX二次开发创建多段线（AcDbPolyline、AcDb2dPolyLine、AcDb3dPolyline的使用）
8. 三、具体内容
9. 1、ARX提供了三种多段线相关的类：AcDbPolyline、AcDb2dPolyLine、AcDb3dPolyline。PLINE 创建的是AcDbPolyline，3DPOLY创建AcDb3dPolyline。创建一般的轻量多段线只需要调用AcDbPolyline的构造函数即可，创建矩形、正多边形、圆形、圆环对象，关键在于顶点和凸度的确定。
11. 2、添加多段线对象的函数实现：
13. AcDbObjectId CPolylineUtil::Add(const AcGePoint2dArray &points,double width)
15. {
17. int numVertices=points.length();
19. AcDbPolyline *pPoly=new AcDbPolyline(numVertices);
21. for (int i=0;i<numVertices;i++)
23. {
25. pPoly->addVertexAt(i,points.at(i),0,width,width);
27. }
29. return CDwgDatabaseUtil::PostToModelSpace(pPoly);
31. }
35. AcDbObjectId CPolylineUtil::Add(const AcGePoint2d &ptStart,const AcGePoint2d &ptEnd,double width)
37. {
39. AcGePoint2dArray points;
41. points.append(ptStart);
43. points.append(ptEnd);
45. return Add(points,width);
47. }
49. AcDbObjectId CPolylineUtil::Add3dPolyline(const AcGePoint3dArray &points)
51. {
53. AcGePoint3dArray verts=points;
55. AcDb3dPolyline *pPoly3d=new AcDb3dPolyline(AcDb::k3dSimplePoly,verts);
57. return CDwgDatabaseUtil::PostToModelSpace(pPoly3d);
59. }
61. AcDbObjectId  CPolylineUtil::AddPolygon(const AcGePoint2d &ptCenter,int number,double radius,double rotation,double width)
63. {
65. double angle=2*CMathUtil::PI()/(double)number;
67. AcGePoint2dArray points;
69. for (int i=0;i<number;i++)
71. {
73. AcGePoint2d pt;
75. pt.x=ptCenter.x+radius*cos(i*angle);
77. pt.y=ptCenter.y+radius*sin(i*angle);
79. points.append(pt);
83. }
85. AcDbObjectId polyId=Add(points,width);
89. AcDbEntity *pEnt=NULL;
91. if (acdbOpenObject(pEnt,polyId,AcDb::kForWrite)==Acad::eOk)
93. {
95. AcDbPolyline *pPoly=AcDbPolyline::cast(pEnt);
97. if (pPoly!=NULL)
99. {
101. pPoly->setClosed(Adesk::kTrue);
103. }
105. pEnt->close();
109. }
111. EntityUtil::Rotate(polyId,ptCenter,rotation);
113. return polyId;
115. }
117. AcDbObjectId CPolylineUtil::AddRectangle(const AcGePoint2d &pt1,const AcGePoint2d &pt2,double width)
119. {
123. double x1=pt1.x,x2=pt2.x;
125. double y1=pt1.y,y2=pt2.y;
129. AcGePoint2d ptLeftBottom(min(x1,x2),min(y1,y2));
131. AcGePoint2d ptRightBottom(max(x1,x2),min(y1,y2));
133. AcGePoint2d ptRightTop(max(x1,x2),max(y1,y2));
135. AcGePoint2d ptLeftTop(min(x1,x2),max(y1,y2));
139. AcDbPolyline *pPoly=new AcDbPolyline(4);
141. pPoly->addVertexAt(0,ptLeftBottom,0,width,width);
143. pPoly->addVertexAt(1,ptRightBottom,0,width,width);
145. pPoly->addVertexAt(2,ptRightTop,0,width,width);
147. pPoly->addVertexAt(3,ptLeftTop,0,width,width);
149. pPoly->setClosed(true);
151. return CDwgDatabaseUtil::PostToModelSpace(pPoly);
155. }
157. AcDbObjectId CPolylineUtil::AddPolyCircle(const AcGePoint2d &ptCenter,double radius,double width)
159. {
161. AcGePoint2d pt1,pt2,pt3;
163. pt1.x=ptCenter.x+radius;
165. pt1.y=ptCenter.y;
167. pt2.x=ptCenter.x-radius;
169. pt2.y=ptCenter.y;
171. pt3.x=ptCenter.x+radius;
173. pt3.y=ptCenter.y;
177. AcDbPolyline *pPoly=new AcDbPolyline(3);
179. pPoly->addVertexAt(0,pt1,1,width,width);
181. pPoly->addVertexAt(1,pt2,1,width,width);
183. pPoly->addVertexAt(2,pt3,1,width,width);
185. pPoly->setClosed(Adesk::kTrue);
189. return CDwgDatabaseUtil::PostToModelSpace(pPoly);
191. }

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