创建协议扩展类
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。此基类包含函数 ，该函数对实体执行输入点处理：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);
初始化基本协议扩展类，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，可以派生一个名为 implements 的类，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，应将默认实现与相关联。AcDbEntityAcDbCustomOsnapInfo
创建每个协议扩展对象的实例，并使用该函数将对象添加到相应的描述符对象。AcRxClassaddX() 例如： pSocketForLine = new AcmeSocketForLine; AcDbLine::desc()->addX(AcmeSocketInfo::desc(), pSocketForLine); 父主题： |
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