ObjectArx 实现类似C# 的DrawJig,支持多实体拖动

枫叶棋语

首先实现接口，因为AcEdJig 仅仅支持单实体进行更新显示，如果用多实体那么就需要一个AcDbEntity 去包装，本次我们换个方式，直接在类中加入AcDbEntity接口，实现subWorldDraw显示多个图元

1. class DrawJig : public AcDbEntity, public AcEdJig {
   
2. public:
   
3.         virtual DragStatus sampler() = 0;
   
4.         virtual bool  update() = 0;
   
5.         virtual bool subWorldDraw(AcGiWorldDraw* mode) = 0;
   
6. protected:
   
7.         AcDbEntity* entity() const final
   
8.         {
   
9.                 return (AcDbEntity*)this;
   
10.         }
    
11. };

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下面用一个简单的例子继承测试下

2. class TestDrrawJig :public DrawJig {
   
3. public:
   
4.         TestDrrawJig() {}
   
5.         bool startDrag(AcGePoint3d ptCenter);
   
6.         DragStatus sampler() override;
   
7.         bool update() override;
   
8.         bool subWorldDraw(AcGiWorldDraw* mode)override;
   
9.         AcGePoint2d Point3dTo2d(AcGePoint3d pnt);
   
10.         AcDbVoidPtrArray CreateEntitys();
    
11.         AcArray<AcDbEntity*> GetEntities();
    
12. private:
    
13.         AcGePoint3d m_centerPnt;
    
14.         AcGePoint3d m_curPnt;
    
15.         AcDbVoidPtrArray m_aryPtr;
    
16. };
    
17. 
    
18. inline AcEdJig::DragStatus TestDrrawJig::sampler()
    
19. {
    
20.         setUserInputControls((UserInputControls)(AcEdJig::kAccept3dCoordinates
    
21.                 | AcEdJig::kNoNegativeResponseAccepted
    
22.                 | AcEdJig::kNullResponseAccepted));
    
23.         AcGePoint3d pointTemp;
    
24.         DragStatus stat = acquirePoint(m_curPnt);
    
25.         if (pointTemp != m_curPnt)
    
26.         {
    
27.                 pointTemp = m_curPnt;
    
28.         }
    
29.         else if (stat == AcEdJig::kNormal)
    
30.         {
    
31.                 return AcEdJig::kNoChange;
    
32.         }
    
33.         return stat;
    
34. }
    
35. 
    
36. inline bool TestDrrawJig::update()
    
37. {
    
38.         for (int i = 0; i < m_aryPtr.length(); i++)
    
39.         {
    
40.                 AcDbEntity* pEnt = (AcDbEntity*)m_aryPtr.at(i);
    
41.                 delete pEnt;
    
42.                 pEnt = NULL;
    
43.         }
    
44.         //创建新实体
    
45.         m_aryPtr = CreateEntitys();
    
46. 
    
47.         return Adesk::kTrue;
    
48. }
    
49. inline bool TestDrrawJig::subWorldDraw(AcGiWorldDraw* mode)
    
50. {
    
51.         for (int i = 0; i < m_aryPtr.length(); i++)
    
52.         {
    
53.                 AcDbEntity* pEnt = (AcDbEntity*)m_aryPtr[i];
    
54.                 mode->geometry().draw(pEnt);
    
55.         }
    
56. 
    
57.         return Adesk::kTrue;
    
58. }
    
59. 
    
60. 
    
61. inline AcGePoint2d TestDrrawJig::Point3dTo2d(AcGePoint3d pnt)
    
62. {
    
63.         return AcGePoint2d(pnt.x, pnt.y);
    
64. }
    
65. 
    
66. inline AcDbVoidPtrArray TestDrrawJig::CreateEntitys()
    
67. {
    
68.         AcDbVoidPtrArray aryEnts;
    
69.         //创建实体
    
70.         double dist = Point3dTo2d(m_curPnt).distanceTo(Point3dTo2d(m_centerPnt));
    
71.         AcGeVector2d vec = Point3dTo2d(m_curPnt) - Point3dTo2d(m_centerPnt);
    
72.         AcGePoint2d pt1, pt2, pt3, pt4;
    
73.         pt1 = Point3dTo2d(m_curPnt);
    
74.         pt3 = pt1 - 2 * vec;
    
75.         vec.rotateBy(PI * 0.5);
    
76.         pt2 = Point3dTo2d(m_centerPnt) + vec;
    
77.         pt4 = pt2 - 2 * vec;
    
78.         AcDbPolyline* poly = new AcDbPolyline;
    
79.         poly->addVertexAt(0, pt1);
    
80.         poly->addVertexAt(1, pt2);
    
81.         poly->addVertexAt(2, pt3);
    
82.         poly->addVertexAt(3, pt4);
    
83.         poly->setClosed(Adesk::kTrue);
    
84.         poly->setColorIndex(1);
    
85.         aryEnts.append(static_cast<void*>(poly));
    
86.         AcDbCircle* circle = new AcDbCircle(m_centerPnt, AcGeVector3d::kZAxis, pt1.distanceTo(pt2) * 0.5);
    
87.         circle->setColorIndex(3);
    
88.         aryEnts.append(static_cast<void*>(circle));
    
89.         return aryEnts;
    
90. }
    
91. 
    
92. inline AcArray<AcDbEntity*> TestDrrawJig::GetEntities()
    
93. {
    
94.         AcArray <AcDbEntity*> ents;
    
95.         for (int i = 0; i < m_aryPtr.length(); i++) {
    
96.                 ents.append((AcDbEntity*)(m_aryPtr[i]));
    
97.         }
    
98.         return ents;
    
99. }
    
100. 
     
101. inline bool TestDrrawJig::startDrag(AcGePoint3d ptCenter)
     
102. {
     
103.         m_centerPnt = ptCenter;
     
104.         m_curPnt = ptCenter;
     
105.         AcString prompt = _T("\n指定角点");
     
106.         setDispPrompt(prompt);
     
107.         AcEdJig::DragStatus stat = drag();
     
108.         if (stat == AcEdJig::kNormal)
     
109.         {
     
110.                 return true;
     
111.         }
     
112.         else
     
113.         {
     
114.                 return false;
     
115.         }
     
116. }

class TestDrrawJig :public DrawJig {<br /> public:<br />         TestDrrawJig() {}<br />         bool startDrag(AcGePoint3d ptCenter);<br />         DragStatus sampler() override;<br />         bool update() override;<br />         bool subWorldDraw(AcGiWorldDraw* mode)override;<br />         AcGePoint2d Point3dTo2d(AcGePoint3d pnt);<br />         AcDbVoidPtrArray CreateEntitys();<br />         AcArray<AcDbEntity*> GetEntities();<br /> private:<br />         AcGePoint3d m_centerPnt;<br />         AcGePoint3d m_curPnt;<br />         AcDbVoidPtrArray m_aryPtr;<br /> };<br /> <br /> inline AcEdJig::DragStatus TestDrrawJig::sampler()<br /> {<br />         setUserInputControls((UserInputControls)(AcEdJig::kAccept3dCoordinates<br />                 | AcEdJig::kNoNegativeResponseAccepted<br />                 | AcEdJig::kNullResponseAccepted));<br />         AcGePoint3d pointTemp;<br />         DragStatus stat = acquirePoint(m_curPnt);<br />         if (pointTemp != m_curPnt)<br />         {<br />                 pointTemp = m_curPnt;<br />         }<br />         else if (stat == AcEdJig::kNormal)<br />         {<br />                 return AcEdJig::kNoChange;<br />         }<br />         return stat;<br /> }<br /> <br /> inline bool TestDrrawJig::update()<br /> {<br />         for (int i = 0; i < m_aryPtr.length(); i++)<br />         {<br />                 AcDbEntity* pEnt = (AcDbEntity*)m_aryPtr.at(i);<br />                 delete pEnt;<br />                 pEnt = NULL;<br />         }<br />         //创建新实体<br />         m_aryPtr = CreateEntitys();<br /> <br />         return Adesk::kTrue;<br /> }<br /> inline bool TestDrrawJig::subWorldDraw(AcGiWorldDraw* mode)<br /> {<br />         for (int i = 0; i < m_aryPtr.length(); i++)<br />         {<br />                 AcDbEntity* pEnt = (AcDbEntity*)m_aryPtr[i];<br />                 mode->geometry().draw(pEnt);<br />         }<br /> <br />         return Adesk::kTrue;<br /> }<br /> <br /> <br /> inline AcGePoint2d TestDrrawJig::Point3dTo2d(AcGePoint3d pnt)<br /> {<br />         return AcGePoint2d(pnt.x, pnt.y);<br /> }<br /> <br /> inline AcDbVoidPtrArray TestDrrawJig::CreateEntitys()<br /> {<br />         AcDbVoidPtrArray aryEnts;<br />         //创建实体<br />         double dist = Point3dTo2d(m_curPnt).distanceTo(Point3dTo2d(m_centerPnt));<br />         AcGeVector2d vec = Point3dTo2d(m_curPnt) - Point3dTo2d(m_centerPnt);<br />         AcGePoint2d pt1, pt2, pt3, pt4;<br />         pt1 = Point3dTo2d(m_curPnt);<br />         pt3 = pt1 - 2 * vec;<br />         vec.rotateBy(PI * 0.5);<br />         pt2 = Point3dTo2d(m_centerPnt) + vec;<br />         pt4 = pt2 - 2 * vec;<br />         AcDbPolyline* poly = new AcDbPolyline;<br />         poly->addVertexAt(0, pt1);<br />         poly->addVertexAt(1, pt2);<br />         poly->addVertexAt(2, pt3);<br />         poly->addVertexAt(3, pt4);<br />         poly->setClosed(Adesk::kTrue);<br />         poly->setColorIndex(1);<br />         aryEnts.append(static_cast<void*>(poly));<br />         AcDbCircle* circle = new AcDbCircle(m_centerPnt, AcGeVector3d::kZAxis, pt1.distanceTo(pt2) * 0.5);<br />         circle->setColorIndex(3);<br />         aryEnts.append(static_cast<void*>(circle));<br />         return aryEnts;<br /> }<br /> <br /> inline AcArray<AcDbEntity*> TestDrrawJig::GetEntities()<br /> {<br />         AcArray <AcDbEntity*> ents;<br />         for (int i = 0; i < m_aryPtr.length(); i++) {<br />                 ents.append((AcDbEntity*)(m_aryPtr[i]));<br />         }<br />         return ents;<br /> }<br /> <br /> inline bool TestDrrawJig::startDrag(AcGePoint3d ptCenter)<br /> {<br />         m_centerPnt = ptCenter;<br />         m_curPnt = ptCenter;<br />         AcString prompt = _T("\n指定角点");<br />         setDispPrompt(prompt);<br />         AcEdJig::DragStatus stat = drag();<br />         if (stat == AcEdJig::kNormal)<br />         {<br />                 return true;<br />         }<br />         else<br />         {<br />                 return false;<br />         }<br /> }

1. void tsJig()
   
2. {
   
3.         DbTrans tr;
   
4.         auto btr = tr.CurrentSpace();
   
5.         auto res = MapleGetPoint();
   
6.         if (!res.Ok) return;
   
7.         TestDrrawJig jig;
   
8.         if (jig.startDrag(res.Value)) {
   
9.                 auto ents = jig.GetEntities();
   
10.                 tr.AddEntities(btr, ents);
    
11.         }
    
12. 
    
13. }

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这样就可以使用多实体Jig了，与C#的DrawJig 差不多