NX二次开发源码： 创建草图并通过草图做出回转体
通过NX开发进行草图的创建，创建草图过程包括基本曲线的创建以及约束。草图的约束分为几何约束和尺寸约束，通过代码的约束使得草图完全约束。
草图完成后，可以通过回转体进行旋转，此处直接做出简单的例子。
仅供参考！
效果如下：
比较乱，仅供参考
<p>void basicFeatures::createSketch()
{</p><p>{
Session *theSession = Session::GetSession();
Part *workPart(theSession->Parts()->Work());
Part *displayPart(theSession->Parts()->Display());
Sketch *nullSketch(NULL);
SketchInPlaceBuilder *sketchInPlaceBuilder1;
sketchInPlaceBuilder1 = workPart->Sketches()->CreateNewSketchInPlaceBuilder(nullSketch);
sketchInPlaceBuilder1->Plane()->SetMethod(PlaneTypes::MethodTypeFixedZ);
Point3d origin1(0.0, 0.0, 0.0);
sketchInPlaceBuilder1->Plane()->SetOrigin(origin1);
sketchInPlaceBuilder1->Plane()->Evaluate();</p><p> // set the reference</p><p> theSession->Preferences()->Sketch()->SetCreateInferredConstraints(true);
theSession->Preferences()->Sketch()->SetContinuousAutoDimensioning(false);
theSession->Preferences()->Sketch()->SetDimensionLabel(Preferences::SketchPreferences::DimensionLabelTypeExpression);
theSession->Preferences()->Sketch()->SetTextSizeFixed(true);
theSession->Preferences()->Sketch()->SetFixedTextSize(3.0);
theSession->Preferences()->Sketch()->SetConstraintSymbolSize(3.0);
theSession->Preferences()->Sketch()->SetDisplayObjectColor(false);
theSession->Preferences()->Sketch()->SetDisplayObjectName(true);</p><p>
NXObject *nXObject1;
nXObject1 = sketchInPlaceBuilder1->Commit();
Sketch *sketch1(dynamic_cast<Sketch *>(nXObject1));
Features::Feature *feature1;
feature1 = sketch1->Feature();</p><p>
sketchInPlaceBuilder1->Destroy();</p><p>
sketch1->Activate(Sketch::ViewReorientFalse);
// define the dimensions
double heigth1 = this->doubleHeight1->GetProperties()->GetDouble("Value");
double heigth2 = this->doubleHeight2->GetProperties()->GetDouble("Value");
double length = this->doubleLength->GetProperties()->GetDouble("Value");
char msg1,msg2,msg3;
sprintf(msg1,"%f",heigth1);
sprintf(msg2,"%f",heigth2);
sprintf(msg3,"%f",length);
Expression *height1exp,*height2exp,*lengthexp;
height1exp= workPart->Expressions()->CreateSystemExpression(msg1);
height2exp= workPart->Expressions()->CreateSystemExpression(msg2);
lengthexp= workPart->Expressions()->CreateSystemExpression(msg3);
// these for the dimension position
Point3d dimOrigin1(-100, heigth1/2, 0.0);
Point3d dimOrigin2(length/2, heigth1+100, 0.0);
Point3d dimOrigin3(length+100, heigth1-heigth2/2, 0.0);</p><p>// add curves
Point3d startPoint1(0.0, 0.0, 0.0);
Point3d endPoint1(0.0,heigth1,0.0);
Point3d endPoint2(length,heigth1,0.0);
Point3d endPoint3(length,heigth1-heigth2,0.0);
Line *line1,*line2,*line3,*line4;
line1 = workPart->Curves()->CreateLine(startPoint1, endPoint1);
line2 = workPart->Curves()->CreateLine(endPoint1, endPoint2);
line3 = workPart->Curves()->CreateLine(endPoint2, endPoint3);
line4 = workPart->Curves()->CreateLine(endPoint3, startPoint1);
theSession->ActiveSketch()->AddGeometry(line1, Sketch::InferConstraintsOptionInferCoincidentConstraints);
theSession->ActiveSketch()->AddGeometry(line2, Sketch::InferConstraintsOptionInferCoincidentConstraints);
theSession->ActiveSketch()->AddGeometry(line3, Sketch::InferConstraintsOptionInferCoincidentConstraints);
theSession->ActiveSketch()->AddGeometry(line4, Sketch::InferConstraintsOptionInferCoincidentConstraints);
</p><p> // add constraints
//..
// for line1
Sketch::ConstraintGeometry geopoint1;
geopoint1.Geometry = line1;
geopoint1.PointType = Sketch::ConstraintPointTypeStartVertex;
geopoint1.SplineDefiningPointIndex = 0;
// find the (0,0,0) point
Sketch::ConstraintGeometry geopoint2;
Point *pointOriginal;
pointOriginal = workPart->Points()->CreatePoint(sketch1->Origin());
geopoint2.Geometry = pointOriginal;
geopoint2.PointType = Sketch::ConstraintPointTypeStartVertex;
geopoint2.SplineDefiningPointIndex = 0;
theSession->ActiveSketch()->CreateCoincidentConstraint(geopoint1,geopoint2);</p><p> Sketch::ConstraintGeometry geoline1;
geoline1.Geometry = line1;
geoline1.PointType = Sketch::ConstraintPointTypeNone;
geoline1.SplineDefiningPointIndex = 0;
theSession->ActiveSketch()->CreateVerticalConstraint(geoline1);
//..
// for line2
Sketch::ConstraintGeometry geoline2;
geoline2.Geometry = line2;
geoline2.PointType = Sketch::ConstraintPointTypeNone;
geoline2.SplineDefiningPointIndex = 0;
theSession->ActiveSketch()->CreateHorizontalConstraint(geoline2);
//..
// for line3
Sketch::ConstraintGeometry geoline3;
geoline3.Geometry = line3;
geoline3.PointType = Sketch::ConstraintPointTypeNone;
geoline3.SplineDefiningPointIndex = 0;
theSession->ActiveSketch()->CreateVerticalConstraint(geoline3);
// use this method to create the constraints
/*SketchConstraintBuilder *line3constraint;
line3constraint= workPart->Sketches()->CreateConstraintBuilder();
line3constraint->GeometryToConstrain()->Add(line3);
line3constraint->SetConstraintType(SketchConstraintBuilder::ConstraintVertical);
line3constraint->Commit();
line3constraint->Destroy();*/
// add dimension
//..
// for line1
Sketch::DimensionGeometry dimobject1_start;
dimobject1_start.AssocType = Sketch::AssocTypeStartPoint;
dimobject1_start.AssocValue = 0;
dimobject1_start.Geometry = line1;
dimobject1_start.HelpPoint.X = 0 ;
dimobject1_start.HelpPoint.Y = 0 ;
dimobject1_start.HelpPoint.Z = 0 ;
NXObject *nullNXObject1(NULL);
dimobject1_start.View = nullNXObject1;</p><p> Sketch::DimensionGeometry dimobject1_end;
dimobject1_end.AssocType = Sketch::AssocTypeEndPoint;
dimobject1_end.AssocValue = 0;
dimobject1_end.Geometry = line1;
dimobject1_end.HelpPoint.X = 0 ;
dimobject1_end.HelpPoint.Y = 0 ;
dimobject1_end.HelpPoint.Z = 0 ;
dimobject1_end.View = nullNXObject1;</p><p> SketchDimensionalConstraint *sketchDimensionalConstraint1 = theSession->ActiveSketch()->CreateDimension(Sketch::ConstraintTypeVerticalDim,dimobject1_start,dimobject1_end,dimOrigin1,height1exp,Sketch::DimensionOptionCreateAsDriving);</p><p> Annotations::Dimension *dimension1;
dimension1 = sketchDimensionalConstraint1->AssociatedDimension();</p><p>
//..
// for line2
Sketch::DimensionGeometry dimobject2_start;
dimobject2_start.AssocType = Sketch::AssocTypeStartPoint;
dimobject2_start.AssocValue = 0;
dimobject2_start.Geometry = line2;
dimobject2_start.HelpPoint.X = 0 ;
dimobject2_start.HelpPoint.Y = 0 ;
dimobject2_start.HelpPoint.Z = 0 ;
dimobject2_start.View = nullNXObject1;</p><p> Sketch::DimensionGeometry dimobject2_end;
dimobject2_end.AssocType = Sketch::AssocTypeEndPoint;
dimobject2_end.AssocValue = 0;
dimobject2_end.Geometry = line2;
dimobject2_end.HelpPoint.X = 0 ;
dimobject2_end.HelpPoint.Y = 0 ;
dimobject2_end.HelpPoint.Z = 0 ;
dimobject2_end.View = nullNXObject1;</p><p> SketchDimensionalConstraint *sketchDimensionalConstraint2 = theSession->ActiveSketch()->CreateDimension(Sketch::ConstraintTypeHorizontalDim,dimobject2_start,dimobject2_end,dimOrigin2,lengthexp,Sketch::DimensionOptionCreateAsDriving);</p><p> Annotations::Dimension *dimension2;
dimension2 = sketchDimensionalConstraint2->AssociatedDimension();</p><p> // for line3
Sketch::DimensionGeometry dimobject3_start;
dimobject3_start.AssocType = Sketch::AssocTypeStartPoint;
dimobject3_start.AssocValue = 0;
dimobject3_start.Geometry = line3;
dimobject3_start.HelpPoint.X = 0 ;
dimobject3_start.HelpPoint.Y = 0 ;
dimobject3_start.HelpPoint.Z = 0 ;
dimobject3_start.View = nullNXObject1;</p><p> Sketch::DimensionGeometry dimobject3_end;
dimobject3_end.AssocType = Sketch::AssocTypeEndPoint;
dimobject3_end.AssocValue = 0;
dimobject3_end.Geometry = line3;
dimobject3_end.HelpPoint.X = 0 ;
dimobject3_end.HelpPoint.Y = 0 ;
dimobject3_end.HelpPoint.Z = 0 ;
dimobject3_end.View = nullNXObject1;</p><p> SketchDimensionalConstraint *sketchDimensionalConstraint3 = theSession->ActiveSketch()->CreateDimension(Sketch::ConstraintTypeVerticalDim,dimobject3_start,dimobject3_end,dimOrigin3,height2exp,Sketch::DimensionOptionCreateAsDriving);</p><p> Annotations::Dimension *dimension3;
dimension3 = sketchDimensionalConstraint3->AssociatedDimension();</p><p> //workPart->Expressions()->Delete(height1exp);</p><p> theSession->ActiveSketch()->Update();</p><p> theSession->ActiveSketch()->Deactivate(Sketch::ViewReorientFalse,Sketch::UpdateLevelModel);
/*</p><p> // revolve the body</p><p> */
Features::Feature *nullFeatures_Feature(NULL);
Features::RevolveBuilder *revolveBuilder1;
revolveBuilder1 = workPart->Features()->CreateRevolveBuilder(nullFeatures_Feature);
revolveBuilder1->Limits()->StartExtend()->Value()->SetRightHandSide("0");
revolveBuilder1->Limits()->EndExtend()->Value()->SetRightHandSide("360");
revolveBuilder1->SetTolerance(0.01);
Section *section1;
section1 = workPart->Sections()->CreateSection(0.0095, 0.01, 0.5);
revolveBuilder1->SetSection(section1);
section1->SetAllowedEntityTypes(Section::AllowTypesOnlyCurves);
std::vector<Features::Feature *> features1(1);
features1 = feature1;
CurveFeatureRule *curveFeatureRule1;
curveFeatureRule1 = workPart->ScRuleFactory()->CreateRuleCurveFeature(features1);
section1->AllowSelfIntersection(false);
std::vector<SelectionIntentRule *> rules1(1);
rules1 = curveFeatureRule1;
NXObject *nullNXObject(NULL);
Point3d helpPoint1(0.0, 0.0, 0.0);
section1->AddToSection(rules1, nullNXObject, nullNXObject, nullNXObject, helpPoint1, Section::ModeCreate, false);
// define the axis</p><p> Direction *direction1;
direction1 = workPart->Directions()->CreateDirection(line2, SenseForward, SmartObject::UpdateOptionWithinModeling);
Point *nullPoint(NULL);
Axis *axis1;
axis1 = workPart->Axes()->CreateAxis(nullPoint, direction1, SmartObject::UpdateOptionWithinModeling);
revolveBuilder1->SetAxis(axis1);</p><p> // commit feature
Features::Feature *feature2;
feature2 = revolveBuilder1->CommitFeature();
revolveBuilder1->Destroy();
}</p><p>}
</p><p> </p>
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