vector<Tri>
时间: 2023-11-12 11:03:22 浏览: 42
vector<Tri> 是一个存储 Tri 对象的向量。你可以使用以下方式来初始化一个 vector<Tri> 对象:
```
vector<Tri> v;
```
关于如何使用 vector<Tri> 对象的相关操作,你可以参考以下代码示例:
```
vector<Tri> v;
// 添加元素
v.push_back(Tri(...));
// 获取向量的大小
int size = v.size();
// 遍历向量
for (auto it = v.begin(); it != v.end(); ++it) {
// 访问元素
Tri elem = *it;
// 进行操作
...
}
```
相关问题
#include <iostream> #include <vector> #include <algorithm> #include <string> using namespace std; class Shape { public: virtual double getArea() = 0; virtual string getName() = 0; void setWidth(double w) { width = w; } void setHeight(double h) { height = h; } protected: double width; double height; }; class Rectangle: public Shape { public: double getArea() { return (width * height); } string getName() { return "矩形"; } }; class Triangle: public Shape { public: double getArea() { return (width * height)/2; } string getName() { return "三角形"; } }; template<typename T> double getTotalArea(vector<T>& shapes) { double total = 0; for (typename vector<T>::iterator it = shapes.begin(); it != shapes.end();++it) { total += *it->getArea(); } return total; } class CompareShapes { public: bool operator()(Shape* a, Shape* b) { return a->getArea() < b->getArea(); } }; int main() { vector<Shape*> shapes; Rectangle rect1; rect1.setWidth(5); rect1.setHeight(7); Rectangle rect2; rect2.setWidth(3); rect2.setHeight(4); Triangle tri1; tri1.setWidth(5); tri1.setHeight(7); Triangle tri2; tri2.setWidth(3); tri2.setHeight(4); shapes.push_back(&rect1); shapes.push_back(&rect2); shapes.push_back(&tri1); shapes.push_back(&tri2); cout << "图形集合的总面积为:" << getTotalArea(shapes) << endl; sort(shapes.begin(), shapes.end(), CompareShapes()); cout << "图形集合中面积最大的图形是:" << shapes.back()->getName() << endl; return 0; }此段代码有错误不能运行,,请帮忙改正
在 `getTotalArea` 函数的 for 循环中,应该改为 `total += (*it)->getArea();`,因为 `it` 是一个指向指针的迭代器,需要先解引用得到指针,再调用其成员函数。另外,类的定义应该放在 `main` 函数之前。以下是修改后的代码:
```
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
class Shape {
public:
virtual double getArea() = 0;
virtual string getName() = 0;
void setWidth(double w) { width = w; }
void setHeight(double h) { height = h; }
protected:
double width;
double height;
};
class Rectangle : public Shape {
public:
double getArea() {
return (width * height);
}
string getName() {
return "矩形";
}
};
class Triangle : public Shape {
public:
double getArea() {
return (width * height) / 2;
}
string getName() {
return "三角形";
}
};
template<typename T>
double getTotalArea(vector<T>& shapes) {
double total = 0;
for (typename vector<T>::iterator it = shapes.begin(); it != shapes.end(); ++it) {
total += (*it)->getArea();
}
return total;
}
class CompareShapes {
public:
bool operator()(Shape* a, Shape* b) {
return a->getArea() < b->getArea();
}
};
int main() {
vector<Shape*> shapes;
Rectangle rect1;
rect1.setWidth(5);
rect1.setHeight(7);
Rectangle rect2;
rect2.setWidth(3);
rect2.setHeight(4);
Triangle tri1;
tri1.setWidth(5);
tri1.setHeight(7);
Triangle tri2;
tri2.setWidth(3);
tri2.setHeight(4);
shapes.push_back(&rect1);
shapes.push_back(&rect2);
shapes.push_back(&tri1);
shapes.push_back(&tri2);
cout << "图形集合的总面积为:" << getTotalArea(shapes) << endl;
sort(shapes.begin(), shapes.end(), CompareShapes());
cout << "图形集合中面积最大的图形是:" << shapes.back()->getName() << endl;
return 0;
}
```
基于vcglib库的各种流形修复算法以及它们的示例
vcglib是一个用于三维几何计算的C++库,它提供了许多用于处理和修复三维模型的算法。以下是一些基于vcglib库的流形修复算法以及它们的示例:
1. Laplacian Smoothing Algorithm(拉普拉斯平滑算法)
拉普拉斯平滑算法是一种基于点的流形修复算法,它通过平滑顶点来修复模型。下面是一个使用vcglib库实现拉普拉斯平滑算法的示例:
```
#include <vcg/complex/complex.h>
#include <vcg/simplex/vertexplus/base.h>
#include <vcg/complex/algorithms/smooth.h>
using namespace vcg;
class MyVertex : public VertexSimp2< MyVertex, Point3f, Normal3f, EmptyPMPAttributes>{};
class MyMesh : public tri::TriMesh< std::vector<MyVertex>, std::vector<DefaultTriMesh::FaceType> >{};
int main()
{
MyMesh mesh;
// 读取模型数据
tri::io::Importer<MyMesh>::Open(mesh, "model.obj");
// 进行拉普拉斯平滑
tri::Smooth<MyMesh>::VertexCoordLaplacian(mesh, 10);
// 输出平滑后的模型
tri::io::Exporter<MyMesh>::Save(mesh, "smoothed_model.obj");
return 0;
}
```
2. Isotropic Remeshing Algorithm(各向同性重网格算法)
各向同性重网格算法是一种基于网格的流形修复算法,它通过重新网格化来修复模型。下面是一个使用vcglib库实现各向同性重网格算法的示例:
```
#include <vcg/complex/complex.h>
#include <vcg/simplex/vertexplus/base.h>
#include <vcg/complex/algorithms/isotropic_remeshing.h>
using namespace vcg;
class MyVertex : public VertexSimp2< MyVertex, Point3f, Normal3f, EmptyPMPAttributes>{};
class MyMesh : public tri::TriMesh< std::vector<MyVertex>, std::vector<DefaultTriMesh::FaceType> >{};
int main()
{
MyMesh mesh;
// 读取模型数据
tri::io::Importer<MyMesh>::Open(mesh, "model.obj");
// 进行各向同性重网格
tri::IsotropicRemeshing<MyMesh>::Params params;
params.SetTargetEdgeLength(0.1);
tri::IsotropicRemeshing<MyMesh>::Do(mesh, params);
// 输出重网格后的模型
tri::io::Exporter<MyMesh>::Save(mesh, "remeshed_model.obj");
return 0;
}
```
3. Hole Filling Algorithm(孔洞填充算法)
孔洞填充算法是一种基于边界的流形修复算法,它通过填补模型的孔洞来修复模型。下面是一个使用vcglib库实现孔洞填充算法的示例:
```
#include <vcg/complex/complex.h>
#include <vcg/simplex/vertexplus/base.h>
#include <vcg/complex/algorithms/hole.h>
using namespace vcg;
class MyVertex : public VertexSimp2< MyVertex, Point3f, Normal3f, EmptyPMPAttributes>{};
class MyMesh : public tri::TriMesh< std::vector<MyVertex>, std::vector<DefaultTriMesh::FaceType> >{};
int main()
{
MyMesh mesh;
// 读取模型数据
tri::io::Importer<MyMesh>::Open(mesh, "model.obj");
// 进行孔洞填充
tri::UpdateTopology<MyMesh>::FaceFace(mesh);
tri::Hole<MyMesh>::Close(mesh);
// 输出填充后的模型
tri::io::Exporter<MyMesh>::Save(mesh, "filled_model.obj");
return 0;
}
```
以上是三种基于vcglib库的流形修复算法以及它们的示例。需要注意的是,这些算法只能修复一些简单的流形缺陷,对于复杂的流形缺陷可能需要使用更高级的算法。