按步骤教你如何创建自定义实体ObjectARX

【实例简介】
使用ObjectARX向导，按步骤教你如何创建自定义实体~
一-选择“ My Cus tomEntity“节点(如果没有,点击” Refresh“图 标) 在其上右击鼠标选择“ Add variable。“ Autodesk class Explorer Group by Type }ot∈tyEx . CCus ErttyDEXoo AdMe“a;, .O MycustomEntty( %e -1Curoe Erbo ◆: Erya ew DDwsFe1 9 Acad: BorsMtus dwgnfe de(e"1 Adesk Boclean woddDraw-G WooDman F9 Aead Ear sata geto nan Ports(eDe OraoMode. t sons Ae 3d 3. enst AeGaePort 变量名写“mPtA”,类型为 AcGePoint3d,模式 protected; 选择" Participate to dWG filing protocol",禁止 Incrcasc version number 一-选择" Implement Get/ Put methods"可以为其添加希望的提 不信息 重复这个过程,增加"mPtB"," m PtAB"和" m ptBA"; 一-现在,增加一个 CString变量" m Text 记着修改我们在Lab3中做的那些修改 现在应该编译你的代码了 在头文件中会出现 static adesk::UInt32 kCurrentversionnumber=NaN;这是作者让自己调整版本号,需要将 “=NaN”去掉,在cpp文件中有定义 Adesk::UInt32 My CustomEntity: kCurrentversionnumber=1;然后修改cpp文件中 i if version >=NaN /*&& version(= endVersion*/) pIler> readitem(&mPtA);类似语句,将NaN用 kCurrentversionnumber代替; Add Member Variable wizard -CustEntity DBX Welcome to the Add Member Variable ward Th rzd add a meneer vase b ro eMs, shuet e unes protec onoe pe vanoc oam Saxons Text v Pamoate s DNG Sngpotooo incease Person neber ngEe E Methods ogent/ notation not requred: Text Caree 由于 rcaditcm和 writtem不支持 CString类型,因此 pIler> readItem( m Text)和 fIler> writtem( m text)会出错 要进行类型转换 再进行下一步之前,我们应该移出一些不用的函数,先从.h文 件中移除:(后面还有这部分的代码,晕!) virtual Acad: ErrorStatus getGrip Points (AcDb Grip DataPtrArray &grips, const double cur Unitsize, const int grip Size, const Ac 3d &cur viewDir, const int bitflags)const; virtual Acad: ErrorStatus moveGripPointsAt(const AcDb VoidPtrArray &gripAppData, const AcGe Vector3d &offset, const int bitflags); 有4种get0 appoints0方法.我们只使用下面这种方法: virtual Acad: ErrorStatus getOsnap Points(AcDb: OsnapMode osnapMode, int gsSelectionMark, const AcGePoint3d &pickpoint, const AcGepoint3d &lastPoint, const AcGeMatrix3d &view Xform, AcGePoint3dArray &snap Points, AcDbIntArray &geomIds)const 现在,你需要删掉那些cpp文件里的相应函数 WORLDDRAW 要画出来我们的自定义实体,需要向 worldDrawO方法中增加 如下的代码: assertReadEnabledo / Bounding Polyline AcGcPoint3d pts [4] pts[0]=m PtA pts[l]=m PtAB pts[2]=m PtB; pts[3]=m PtBA mode->sub Entity Traits( setSelection Marker(1); Mark I mode->sub Entity Traits. setColor(1); //Red mode->geometry polygon(4,pts) / Entity's Text mode->subEntity Traits(). setSelection Marker(2); //Mark 2 mode->sub Entity Traits. setcolor(256); // By Layer AcGiTextStyle style style. setFileName(txt. Shx") style. setBig Font FileName("); style set Textsize(25) style. loadstylereco AcGePoint3d txtPt((m PtB x+m PtA. x)/2.0,(m PtBy+m PtA. y)/2.0 PtA.z mode->geometry. text(txtPt, Ac Ge Vector3d KZAxis (m PtAB-m PtA), m Text, m Text. GetLengtho), Adesk: k False, style) return adesk, k True GRIP Points 打开cp文件中仅剩的那个 getGripPointse(方法; 我们要增加5个捕获点,每个点一个(A点、B点、AB点、BA点), 加上中心点 在 getGrippoints(方法中增加如下代码 grippoints. append(m PtA) gripPoints. append(m PtAB); gripPoints. append(m PtB) grippoints. append (m PtBA) gripPoints. append (Ac GePoint3d((m PtB x+m PtA. x)/2.0,(m PtBy+m PtA. y)/2.0, m PtA.2)); 现在,当我们点击每一个捕获点时我们希望完成一个事件,这就 需要用 moveGrippointsAt0方法来完成 我们需要使用 gctGripPoints(方法来检査当前焦点的捕点的 索引值,然后进行变换; 在剩余的 moveGripPointsAt(方法中增加如下代码: assert Write Enabled for(int i=0; K<indices length(; i++)i int idx=indices at(1); // For a and center point if (idx==0 idx==4 )m PtA += offset / For Ab and center point if (idx=-1 idx--4)m PtAB+=offset; / For b and center point if (idx==2 idx==4)m PtB+= offset // For ba and center point if (idx==3 idx=4)m PtBA+=offset return(Acad: eOk) if语句两个条件之间缺少&&运算符; OSNAP Points 打开 getOsnapPoints(方法,我们增加3种0snap方式: EndPoint, Midpoint and Center assertReadEnabledo switch(osnap Mode)i case acdb kos modeend snapPoints. append (m ptA) snappoints. append(m PtAB) snappoints. append(m PtB) snapPoints. append(m PtBA) Dreak case acdb: k Os Modemid snapPoints. append(m PtA+((m PtABm PtA) length(/2.0)((m PtAB-m PtA). normalize)) snapPoints. append(m PtAB+((m PtBm PtAB).length(/2.) *((m PtB-m PtAB). normalize)) snappoints. append(m PtB+((m PtBAm PtB).length(/2.0)((m PtBA-m PtB). normalize)) snapPoints. append(m PtBA+((m PtAm PtBa)length(/2. 0)*((m PtA-m PtBA). normalize) break. case AcDb kOsModeCen snap points. append( Acge Point3d((m PtBx+m PtA. x)/2.0, (m PtB y+m PtA. y)/2.0, m PtA. z)) break return(Acad eOk); TRANSFORMATION 用户自定义实体通过 transformBy(方法来实现 打廾 Autodesk类浏览器,展廾 MyCustomEntity节点,展开Base Classes节点再展开 AcDbEntity节点 滚动列表选择 Acad Error Status transformBy(const AcGeMatrix3d & 在该方法上右击鼠标选择" Implement Base Class method" 这个函数逻辑非常简单,只需增加如下代码 assert Write Enabled m PtA transformBy(xform) m PtAB transformBy(xform) m PtB transform By (xform) m PtBA transformBy(xform) return(Acad: eOk) 这个函数实现用户自定义实体的变换 ARX PROJECT 首先我们需要增加一个新的命令" My CustEnt"; 这将在 acxrEntrypoint.cpp文件中生成一个方法; 现在增加必须的头文件 #include "StdAfx. h #include ". CustEntity dBX My Custom Entity. h 在这个函数中我们将生成我们的实体 / Input information ads point ptl, pt2 if (aced GetPoint(NULL, "Set the first point: n"ptD)!=RtnOrm return: if (aced Corner(ptl, "Set the second point: \n, pt2)!=RTNORM return char buffer 5121; if (aced GetString(0, Enter the text: \n", buffer)!-RTNORM) return / Setup entity MyCustom Entity * pEnt=new MyCustomEntityO 【实例截图】
【核心代码】