若要创建自定义对象捕捉模式,必须创建协议扩展类来处理每个实体的输入点处理。该类定义每个自定义对象捕捉模式必须为相关实体实现的协议。此基类包含对实体执行输入点处理的函数:AcDbCustomOsnapInfogetOsnapInfo() class AcDbCustomOsnapInfo : public AcRxObject { public: ACRX_DECLARE_MEMBERS(AcDbCustomOsnapInfo); virtual Acad::ErrorStatus getOsnapInfo( AcDbEntity* pickedObject, int gsSelectionMark, const AcGePoint3d& pickPoint, const AcGePoint3d& lastPoint, const AcGeMatrix3d& viewXform, AcArray<AcGePoint3d>& snapPoints, AcArray<int>& geomIdsForPts, AcArray<AcGeLine3d>& snapLines, AcArray<int>& geomIdsForLines); }; 为自定义对象捕捉模式创建协议扩展类
class AcmeSocketInfo : public AcDbCustomOsnapInfo{ public: ACRX_DECLARE_MEMBERS(AcDbSocketInfo); virtual Acad::ErrorStatus getOsnapInfo( AcDbEntity* pickedObject, int gsSelectionMark, const AcGePoint3d& pickPoint, const AcGePoint3d& lastPoint, const AcGeMatrix3d& viewXform, AcArray<AcGePoint3d>& snapPoints, AcArray<int>& geomIdsForPts, AcArray<AcGeLine3d>& snapLines, AcArray<int>& geomIdsForLines); }; ACRX_NO_CONS_DEFINE_MEMBERS(AcmeSocketInfo, AcDbCustomOsnapInfo); 初始化基协议扩展类并将其添加到运行时类层次结构中。 例如,将以下行添加到您的函数中:acrxEntryPoint() AcmeSocketInfo::rxInit(); acrxBuildClassHierarchy(); 对于每个相关的实体类,从基类派生一个协议扩展类。 例如,您可以派生一个名为该类,该类实现用于处理行的输入点处理。AcmeSocketForLinesgetOsnapInfo() 注意:对于派生自的每个注册类,应与默认实现相关联。AcDbEntityAcDbCustomOsnapInfo
创建每个协议扩展对象的实例,并使用函数将这些对象添加到适当的描述符对象中。AcRxClassaddX() 例如: pSocketForLine = new AcmeSocketForLine; AcDbLine::desc()->addX(AcmeSocketInfo::desc(), pSocketForLine); |
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