列文章目录

UG/NX二次开发Siemens官方NXOPEN实例解析—2.1 AssemblyViewer

UG/NX二次开发Siemens官方NXOPEN实例解析—2.2 Selection

UG/NX二次开发Siemens官方NXOPEN实例解析—2.3 Selection_UIStyler

UG/NX二次开发Siemens官方NXOPEN实例解析—2.4 File2Points

UG/NX二次开发Siemens官方NXOPEN实例解析—2.5 QuickExtrude

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前言

        随着工业智能化的不断发展，UG二次开发的需求越来越多，也吸引了大批的二开从业人员，本人作为一名资深IT从业者（10年+）也毅然加入二次开发大军。

        然而，和流行IT行业（互联网、金融、医疗等）相比，工业智能化的门槛显得更高一点，专业的工业软件，相对封闭的开发理念和更小的开发圈子，让刚进入二开的从业者有点举步维艰。边学边整理，希望通过这系列文章的整理能给二开的生态增添一叶绿。

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一、知识点提取

本案例实现了快速拉伸草图，主要知识点如下：

1）不使用blockui实现选择草图功能

2）返回输入参数

3）快速拉伸草图

二、案例需求分析

1、效果图

2、需求分解

1）选择曲线

2）拉伸曲线

三、程序分析

1、源码所在目录

UGOPEN\SampleNXOpenApplications\C++\QuickExtrude

2、主要功能分析 

1）选择曲线，输入拉伸参数的实现（不使用blockui）

	char labels[][16] = {"Start Limit","End Limit"};
	int noOfitems = 2;
	double limits[2] = {0.0,1.0};
	int *ip5 = NULL;
	int response;
	NXOpen::Sketch* sketch1 = NULL;
	//Method SelectSketch is called for user to select sketch
	sketch1 =  SelectSketch();
	if(sketch1 == NULL)
	{
		return;
	}
	//Below method launches dialog for asking start and end limits from the user
	response = uc1609("Start and End Limit", labels ,noOfitems,limits, ip5);

//Method that returns sketch after user selection
NXOpen::Sketch* SelectSketch()
{	
	UI *theUI = UI::GetUI();
	NXOpen::Selection::SelectionScope scope = Selection::SelectionScopeWorkPart;
	NXOpen::Selection::SelectionAction action = Selection::SelectionActionClearAndEnableSpecific;
	std::vector<NXOpen::Selection::MaskTriple>selectionMask_array(1);
	selectionMask_array[0].Type = UF_sketch_type;
	selectionMask_array[0].Subtype = 0;
	selectionMask_array[0].SolidBodySubtype = 0;
	NXOpen::NXObject *selectedObject = NULL;
	Point3d cursor;
	cursor.X = 0.0;
	cursor.Y = 0.0;
	cursor.Z = 0.0;
	theUI->SelectionManager()->SelectObject("Select Sketch","Sketch Selection",scope,action,true,false,selectionMask_array,&selectedObject,&cursor);
	Sketch *sketch1(dynamic_cast<Sketch *>(selectedObject));
	if(sketch1==NULL)
	{
		return NULL;
	}
	return sketch1;	
}

 这里主要使用了2个内部方法：

1、theUI->SelectionManager()->SelectObject() , 实现选择对象的功能，可以通过参数控制对象过滤

2、uc1609(), 显示输入菜单并获得响应， 这个方法可以用来收集输入参数

2、 快速拉伸曲线功能

	//Inititalizing ExtrudeBuilder with NULL Feature.
    Features::ExtrudeBuilder *extrudeBuilder1;
    extrudeBuilder1 = workPart->Features()->CreateExtrudeBuilder(nullFeatures_Feature);
    extrudeBuilder1->SetSection(section1);
   
    //Boolean Type is set to Create
    extrudeBuilder1->BooleanOperation()->SetType(GeometricUtilities::BooleanOperation::BooleanTypeCreate);

    //Stat end Endlimits are the inputs from the user in the strings start and end.
	extrudeBuilder1->Limits()->StartExtend()->Value()->SetRightHandSide(start.str());    
    extrudeBuilder1->Limits()->EndExtend()->Value()->SetRightHandSide(end.str());
    
	//Default offset values are kept
    extrudeBuilder1->Offset()->StartOffset()->SetRightHandSide("0");    
    extrudeBuilder1->Offset()->SetStartOffset("0");    
    extrudeBuilder1->Offset()->EndOffset()->SetRightHandSide("0.25");    
    extrudeBuilder1->Offset()->SetEndOffset("0.25");
	theSession->SetUndoMarkName(markId1, "'Extrude Dialog");
    section1->SetAllowedEntityTypes(Section::AllowTypesOnlyCurves);
    std::vector<Features::Feature *> features1(1);
  	features1[0] = sketch1->Feature();
    CurveFeatureRule *curveFeatureRule1;
    curveFeatureRule1 = workPart->ScRuleFactory()->CreateRuleCurveFeature(features1);
    section1->AllowSelfIntersection(false);
    std::vector<SelectionIntentRule *> rules1(1);
    rules1[0] = curveFeatureRule1;

	//Accepting all the geometry from the sketch
	std::vector<NXObject *> geoms = sketch1->GetAllGeometry();
	NXObject *nXObject1 = geoms[0];
    NXObject *nullNXObject(NULL);
    Point3d helpPoint1(4.0, 2.58864289093996, 2.22930704874002);
	
	//The selected sketch is added to the section
    section1->AddToSection(rules1, nXObject1, nullNXObject, nullNXObject, helpPoint1, Section::ModeCreate);
    
	//Setting up the direction 
    Direction *direction1;
    direction1 = workPart->Directions()->CreateDirection(sketch1, SenseForward, SmartObject::UpdateOptionWithinModeling);
    extrudeBuilder1->SetDirection(direction1);
    extrudeBuilder1->SetParentFeatureInternal(false);
    
	//CommitFeature emethod will create Extrude
    Features::Feature *feature1;
    feature1 = extrudeBuilder1->CommitFeature();

 这里用到了ExtrudeBuilder类，实现曲线拉伸。拉伸方法需要关注以下几点：

1）拉伸的起止限制

    extrudeBuilder1->Limits()->StartExtend()->Value()->SetRightHandSide(start.str());    
    extrudeBuilder1->Limits()->EndExtend()->Value()->SetRightHandSide(end.str());

2）偏置设置

    extrudeBuilder1->Offset()->StartOffset()->SetRightHandSide("0");    
    extrudeBuilder1->Offset()->SetStartOffset("0");    
    extrudeBuilder1->Offset()->EndOffset()->SetRightHandSide("0.25");    
    extrudeBuilder1->Offset()->SetEndOffset("0.25");

3）拉伸方向设置

    Direction *direction1;
    direction1 = workPart->Directions()->CreateDirection(sketch1, SenseForward,  SmartObject::UpdateOptionWithinModeling);
    extrudeBuilder1->SetDirection(direction1);
    extrudeBuilder1->SetParentFeatureInternal(false);