NX二次开发-将草图直线约束到基准轴上SketchConstraintBuilder

有人问我，怎么做草图直线约束到基准轴上。其实录一下就可以了。

NX9+VS2012



//CreateSketch

// Mandatory UF Includes
#include <uf.h>
#include <uf_object_types.h>

// Internal Includes
#include <NXOpen/ListingWindow.hxx>
#include <NXOpen/NXMessageBox.hxx>
#include <NXOpen/UI.hxx>

// Internal+External Includes
#include <NXOpen/Annotations.hxx>
#include <NXOpen/Assemblies_Component.hxx>
#include <NXOpen/Assemblies_ComponentAssembly.hxx>
#include <NXOpen/Body.hxx>
#include <NXOpen/BodyCollection.hxx>
#include <NXOpen/Face.hxx>
#include <NXOpen/Line.hxx>
#include <NXOpen/NXException.hxx>
#include <NXOpen/NXObject.hxx>
#include <NXOpen/Part.hxx>
#include <NXOpen/PartCollection.hxx>
#include <NXOpen/Session.hxx>


//头文件
#include <NXOpen/Sketch.hxx>
#include <NXOpen/SketchCollection.hxx>
#include <NXOpen/SketchInPlaceBuilder.hxx>
#include <NXOpen/Plane.hxx>
#include <NXOpen/PlaneCollection.hxx>
#include <NXOpen/Features_Feature.hxx>
#include <NXOpen/Features_FeatureBuilder.hxx>
#include <NXOpen/Features_FeatureCollection.hxx>
#include <NXOpen/Curve.hxx>
#include <NXOpen/CurveCollection.hxx>
#include <NXOpen/Line.hxx>
#include <NXOpen/LineCollection.hxx>
#include <NXOpen/Preferences_SessionPreferences.hxx>
#include <NXOpen/Preferences_SessionSketch.hxx>
#include <NXOpen/Preferences_SketchPreferences.hxx>
#include <NXOpen/Point.hxx>
#include <NXOpen/PointCollection.hxx>
#include <NXOpen/Expression.hxx>
#include <NXOpen/ExpressionCollection.hxx>


#include <NXOpen/DatumAxis.hxx>
#include <NXOpen/DatumCollection.hxx>
#include <NXOpen/SketchConstraintBuilder.hxx>
#include <NXOpen/ModelingView.hxx>
#include <NXOpen/ModelingViewCollection.hxx>
#include <NXOpen/SelectNXObject.hxx>
#include <NXOpen/SelectNXObjectList.hxx>
#include <NXOpen/SelectObject.hxx>
#include <NXOpen/SelectObjectList.hxx>

// Std C++ Includes
#include <iostream>
#include <sstream>

using namespace NXOpen;
using std::string;
using std::exception;
using std::stringstream;
using std::endl;
using std::cout;
using std::cerr;


//------------------------------------------------------------------------------
// NXOpen c++ test class 
//------------------------------------------------------------------------------
class MyClass
{
    // class members
public:
    static Session *theSession;
    static UI *theUI;

    MyClass();
    ~MyClass();

    void do_it();
    void print(const NXString &);
    void print(const string &);
    void print(const char*);

private:
    Part *workPart, *displayPart;
    NXMessageBox *mb;
    ListingWindow *lw;
    LogFile *lf;
};

//------------------------------------------------------------------------------
// Initialize static variables
//------------------------------------------------------------------------------
Session *(MyClass::theSession) = NULL;
UI *(MyClass::theUI) = NULL;

//------------------------------------------------------------------------------
// Constructor 
//------------------------------------------------------------------------------
MyClass::MyClass()
{

    // Initialize the NX Open C++ API environment
    MyClass::theSession = NXOpen::Session::GetSession();
    MyClass::theUI = UI::GetUI();
    mb = theUI->NXMessageBox();
    lw = theSession->ListingWindow();
    lf = theSession->LogFile();

    workPart = theSession->Parts()->Work();
    displayPart = theSession->Parts()->Display();

}

//------------------------------------------------------------------------------
// Destructor
//------------------------------------------------------------------------------
MyClass::~MyClass()
{
}

//------------------------------------------------------------------------------
// Print string to listing window or stdout
//------------------------------------------------------------------------------
void MyClass::print(const NXString &msg)
{
    if(! lw->IsOpen() ) lw->Open();
    lw->WriteLine(msg);
}
void MyClass::print(const string &msg)
{
    if(! lw->IsOpen() ) lw->Open();
    lw->WriteLine(msg);
}
void MyClass::print(const char * msg)
{
    if(! lw->IsOpen() ) lw->Open();
    lw->WriteLine(msg);
}




//------------------------------------------------------------------------------
// Do something
//------------------------------------------------------------------------------
void MyClass::do_it()
{

    // TODO: add your code here

    //在任务环境中绘制草图,不加就是直接草图
    theSession->BeginTaskEnvironment();

    NXOpen::Sketch *nullNXOpen_Sketch(NULL);
    //按平面方式创建草图
    NXOpen::SketchInPlaceBuilder *sketchInPlaceBuilder1;
    sketchInPlaceBuilder1 = workPart->Sketches()->CreateNewSketchInPlaceBuilder(nullNXOpen_Sketch);

    //设置平面选项
    sketchInPlaceBuilder1->SetPlaneOption(Sketch::PlaneOptionNewPlane);

    //创建平面(Z平面)
    sketchInPlaceBuilder1->Plane()->SetMethod(PlaneTypes::MethodTypeFixedZ);

    //连续自动标注尺寸
    theSession->Preferences()->Sketch()->SetContinuousAutoDimensioning(false);

    //生成
    NXOpen::NXObject *nXObject1;
    nXObject1 = sketchInPlaceBuilder1->Commit();

    //设置对象属性的名字
    nXObject1->SetName("ObjectName");

    //转换成Feature
    NXOpen::Sketch *sketch1(dynamic_cast<NXOpen::Sketch *>(nXObject1));
    NXOpen::Features::Feature *feature1;
    feature1 = sketch1->Feature();

    //设置草图特征的名字
    feature1->SetName("SketchFeatureName");

    //销毁
    sketchInPlaceBuilder1->Destroy();

    //退出任务环境草图,不加就是直接草图
    theSession->EndTaskEnvironment();

    //激活草图
    sketch1->Activate(NXOpen::Sketch::ViewReorientTrue);//参数是否将视图定向到草图

    //创建四条直线(做矩形)
    Point3d startPoint1(50, 10, 0);
    Point3d endPoint1(100, 10, 0);
    Line *line1 = workPart->Curves()->CreateLine(startPoint1, endPoint1);


    //添加到草图里
    sketch1->AddGeometry(line1, Sketch::InferConstraintsOptionInferCoincidentConstraints);//参数二,自动推断出约束

    //1.由创建几何约束方法使用,以指示约束应该应用于什么几何
    Sketch::ConstraintGeometry geom_line1;
    geom_line1.Geometry = line1;//几何对象
    geom_line1.PointType = Sketch::ConstraintPointTypeNone;//点的类型
    geom_line1.SplineDefiningPointIndex = 0;//忽略,除非点类型是SplineDefiningPoint
    //创建一个水平约束
    sketch1->CreateHorizontalConstraint(geom_line1);

    //1.
    Sketch::ConstraintGeometry geom_line1_startPoint;
    geom_line1_startPoint.Geometry = line1;//几何对象(直线)
    geom_line1_startPoint.PointType = Sketch::ConstraintPointTypeStartVertex;//通过这条线找到它的起始端点
    geom_line1_startPoint.SplineDefiningPointIndex = 0;//忽略,除非点类型是SplineDefiningPoint

    //得到草图原点坐标
    Point3d SketchOri = sketch1->Origin();

    //创建一个点
    Point *OriPoint = workPart->Points()->CreatePoint(SketchOri);

    //2.
    Sketch::ConstraintGeometry geom_OriPoint;
    geom_OriPoint.Geometry = OriPoint;//几何对象(点)
    geom_OriPoint.PointType = Sketch::ConstraintPointTypeNone;//点的类型为空
    geom_OriPoint.SplineDefiningPointIndex = 0;//忽略,除非点类型是SplineDefiningPoint

    //创建点到Y轴约束
    SketchConstraintBuilder *sketchConstraintBuilder1;
    sketchConstraintBuilder1 = workPart->Sketches()->CreateConstraintBuilder();
    Point3d point1_1(0, 0, 0);
    View *nullView(NULL);
    sketchConstraintBuilder1->GeometryToConstrain()->Add(InferSnapType::SnapTypeStart, line1, workPart->ModelingViews()->WorkView(), point1_1, NULL, nullView, point1_1);
    DatumAxis *datumAxis1(dynamic_cast<DatumAxis *>(workPart->Datums()->FindObject("DATUM_CSYS(0) Y axis")));
    sketchConstraintBuilder1->GeometryToConstrainTo()->SetValue(datumAxis1, workPart->ModelingViews()->WorkView(), point1_1);sketchConstraintBuilder1->Commit();
    sketchConstraintBuilder1->Destroy();

    //完成草图
    sketch1->Deactivate(Sketch::ViewReorientTrue, Sketch::UpdateLevelModel);//参数一,不重新定位视图到草图.参数二,更新完整的模型和草图

}

//------------------------------------------------------------------------------
// Entry point(s) for unmanaged internal NXOpen C/C++ programs
//------------------------------------------------------------------------------
//  Explicit Execution
extern "C" DllExport void ufusr( char *parm, int *returnCode, int rlen )
{
    try
    {
        // Create NXOpen C++ class instance
        MyClass *theMyClass;
        theMyClass = new MyClass();
        theMyClass->do_it();
        delete theMyClass;
    }
    catch (const NXException& e1)
    {
        UI::GetUI()->NXMessageBox()->Show("NXException", NXOpen::NXMessageBox::DialogTypeError, e1.Message());
    }
    catch (const exception& e2)
    {
        UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, e2.what());
    }
    catch (...)
    {
        UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, "Unknown Exception.");
    }
}


//------------------------------------------------------------------------------
// Unload Handler
//------------------------------------------------------------------------------
extern "C" DllExport int ufusr_ask_unload()
{
    return (int)NXOpen::Session::LibraryUnloadOptionImmediately;
}


Caesar卢尚宇
2020年8月31日