程序示例精选
VS+Qt+opencascade三维绘图stp/step/igs/stl格式图形读取显示
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前言

这篇博客针对《VS+Qt+opencascade三维绘图stp/step/igs/stl格式图形读取显示》编写代码，代码整洁，规则，易读。 学习与应用推荐首选。

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运行结果

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文章目录

一、所需工具软件
二、使用步骤
       1. 主要代码
       2. 运行结果
三、在线协助

一、所需工具软件

       1. VS2019, Qt
       2. C++

二、使用步骤

代码如下（示例）：

//#define WNT
#include <gp_Circ.hxx>
#include <gp_Elips.hxx>
#include <gp_Sphere.hxx>
#include <Poly_Polygon3D.hxx>
#include <Poly_Triangulation.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>
#include <TopTools_HSequenceOfShape.hxx>
#include <BRepBuilderAPI_MakeVertex.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <IGESControl_Controller.hxx>
#include <IGESControl_Writer.hxx>
#include <IGESControl_Reader.hxx>
#include <TopoDS_Edge.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS.hxx>
#include <BRep_Tool.hxx>
#include <XBRepMesh.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <BRepAdaptor_Curve.hxx>
#include <GCPnts_TangentialDeflection.hxx>
#include <TopExp_Explorer.hxx>
#include <Standard_TypeDef.hxx>
#include <vtkRenderer.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkTriangle.h>
void BuildMesh(vtkRenderer* render, const TopoDS_Face& face, double deflection = 0.1)
{
	TopLoc_Location location;
	//BRepMesh::Mesh(face, deflection);该函数已经弃用
	BRepMesh_IncrementalMesh(face, deflection);

	Handle_Poly_Triangulation triFace = BRep_Tool::Triangulation(face, location);
	Standard_Integer nTriangles = triFace->NbTriangles();
	gp_Pnt vertex1;
	gp_Pnt vertex2;
	gp_Pnt vertex3;
	Standard_Integer nVertexIndex1 = 0;
	Standard_Integer nVertexIndex2 = 0;
	Standard_Integer nVertexIndex3 = 0;
	TColgp_Array1OfPnt nodes(1, triFace->NbNodes());
	Poly_Array1OfTriangle triangles(1, triFace->NbTriangles());
	nodes = triFace->Nodes();
	triangles = triFace->Triangles();
	vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
	vtkSmartPointer<vtkCellArray> cells = vtkSmartPointer<vtkCellArray>::New();
	vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
	points->Allocate(nTriangles * 3);
	cells->Allocate(nTriangles);
	int id = 0;
	for (Standard_Integer i = 1; i <= nTriangles; i++)
	{
		Poly_Triangle aTriangle = triangles.Value(i);
		aTriangle.Get(nVertexIndex1, nVertexIndex2, nVertexIndex3);
		vertex1 = nodes.Value(nVertexIndex1).Transformed(location.Transformation());
		vertex2 = nodes.Value(nVertexIndex2).Transformed(location.Transformation());
		vertex3 = nodes.Value(nVertexIndex3).Transformed(location.Transformation());
		points->InsertNextPoint(vertex1.X(), vertex1.Y(), vertex1.Z());
		points->InsertNextPoint(vertex2.X(), vertex2.Y(), vertex2.Z());
		points->InsertNextPoint(vertex3.X(), vertex3.Y(), vertex3.Z());
		vtkSmartPointer<vtkTriangle> triangle = vtkSmartPointer<vtkTriangle>::New();
		triangle->GetPointIds()->SetId(0, id * 3);
		triangle->GetPointIds()->SetId(1, id * 3 + 1);
		triangle->GetPointIds()->SetId(2, id * 3 + 2);
		// Add the triangle to a cell array
		cells->InsertNextCell(triangle);
		id++;
	}
	polyData->SetPoints(points);
	polyData->SetPolys(cells);
	vtkSmartPointer<vtkPolyDataMapper> sourceMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
	//setInput函数已经弃用，使用SetInputData()
	sourceMapper->SetInputData(polyData);

	vtkSmartPointer<vtkActor> sourceActor = vtkSmartPointer<vtkActor>::New();
	sourceActor->SetMapper(sourceMapper);
	sourceActor->GetProperty()->SetColor(1, 0, 0);
	render->AddActor(sourceActor);
}
void BuildScene(vtkRenderer* renderer, Handle(TopTools_HSequenceOfShape)& aHSequenceOfShape)
{
	Standard_Integer index = aHSequenceOfShape->Length();
	TopoDS_Shape theCompSolid = aHSequenceOfShape->ChangeValue(index);
	}
}
//这里添加三行代码
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkRenderingFreeType);
VTK_MODULE_INIT(vtkInteractionStyle);

int main(void)

{
	vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
	vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->AddRenderer(renderer);
	Standard_Integer status = ReadIGES("cylinder.igs", aHSequenceOfShape);
	cout << "return status:" << status << endl;
	BuildScene(renderer, aHSequenceOfShape);
	renderer->SetBackground(1, 1, 1);
	// Render and interact
	renderWindow->Render();
	renderWindowInteractor->Start();
	return 0;

}

运行结果

三、在线协助：

如需安装运行环境或远程调试，见文章底部个人 QQ 名片，由专业技术人员远程协助！

1）远程安装运行环境，代码调试
2）Visual Studio, Qt, C++, Python编程语言入门指导
3）界面美化
4）软件制作

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