VTK笔记-几何图形-点vtkPoints构成的空间曲线
2024-05-14 12:13:14
vtkPoints
vtkPoints表示三维点的集合。
vtkPoints的数据模型是根据（点或单元）id访问的vx-vy-vz三元组数组。
默认数据类型为VTK_FLOAT类型；
Set接口
设置点个数
void SetNumberOfPoints(vtkIdType numPoints); vtkTypeBool Resize(vtkIdType numPoints);
设置点数据
void SetPoint(vtkIdType id, const float x[3]) VTK_EXPECTS(0 <= id && id < GetNumberOfPoints()){this->Data->SetTuple(id, x);}void SetPoint(vtkIdType id, const double x[3]) VTK_EXPECTS(0 <= id && id < GetNumberOfPoints()){this->Data->SetTuple(id, x);}void SetPoint(vtkIdType id, double x, double y, double z) VTK_EXPECTS(0 <= id && id < GetNumberOfPoints()); void InsertPoint(vtkIdType id, const float x[3]) VTK_EXPECTS(0 <= id){this->Data->InsertTuple(id, x);}void InsertPoint(vtkIdType id, const double x[3]) VTK_EXPECTS(0 <= id){this->Data->InsertTuple(id, x);}void InsertPoint(vtkIdType id, double x, double y, double z) VTK_EXPECTS(0 <= id); void InsertPoints(vtkIdList* dstIds, vtkIdList* srcIds, vtkPoints* source){this->Data->InsertTuples(dstIds, srcIds, source->Data);} void InsertPoints(vtkIdType dstStart, vtkIdType n, vtkIdType srcStart, vtkPoints* source){this->Data->InsertTuples(dstStart, n, srcStart, source->Data);} vtkIdType InsertNextPoint(const float x[3]) { return this->Data->InsertNextTuple(x); }vtkIdType InsertNextPoint(const double x[3]) { return this->Data->InsertNextTuple(x); }vtkIdType InsertNextPoint(double x, double y, double z);
vtkPoints内部数据类型
virtual int GetDataType() const; virtual void SetDataType(int dataType);void SetDataTypeToBit() { this->SetDataType(VTK_BIT); }void SetDataTypeToChar() { this->SetDataType(VTK_CHAR); }void SetDataTypeToUnsignedChar() { this->SetDataType(VTK_UNSIGNED_CHAR); }void SetDataTypeToShort() { this->SetDataType(VTK_SHORT); }void SetDataTypeToUnsignedShort() { this->SetDataType(VTK_UNSIGNED_SHORT); }void SetDataTypeToInt() { this->SetDataType(VTK_INT); }void SetDataTypeToUnsignedInt() { this->SetDataType(VTK_UNSIGNED_INT); }void SetDataTypeToLong() { this->SetDataType(VTK_LONG); }void SetDataTypeToUnsignedLong() { this->SetDataType(VTK_UNSIGNED_LONG); }void SetDataTypeToFloat() { this->SetDataType(VTK_FLOAT); }void SetDataTypeToDouble() { this->SetDataType(VTK_DOUBLE); }
Get接口
获取点集占用内存空间大小，获取指定ID的点坐标数据；
unsigned long GetActualMemorySize(); vtkIdType GetNumberOfPoints() const { return this->Data->GetNumberOfTuples(); } double* GetPoint(vtkIdType id) VTK_EXPECTS(0 <= id && id < GetNumberOfPoints()) VTK_SIZEHINT(3){return this->Data->GetTuple(id);} void GetPoint(vtkIdType id, double x[3]) VTK_EXPECTS(0 <= id && id < GetNumberOfPoints())VTK_SIZEHINT(3){this->Data->GetTuple(id, x);}void GetPoints(vtkIdList* ptId, vtkPoints* outPoints);
计算点集边界，xmin，xmax，ymin，ymax，zmin，zmax这6个数值。
virtual void ComputeBounds(); double* GetBounds() VTK_SIZEHINT(6); void GetBounds(double bounds[6]);
示例
读取一个点坐标文件，绘制线段
1.points.txt文本中每一行记录了XYZ坐标，浮点型，每个数值之间使用空格分割；
2.读取points.txt文件，拆分每行字符串，得到一个点的XYZ坐标值；
3.生成vtkPolyData的几何数据vtkPoints（离散点集合）；
4.生成vtkPolyData的拓扑数据vtkCellArray（一组线段信息）；
5.进入渲染管线；
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vtkPoints
vtkPolyData
vtkCellArray
vtkPolyDataMapper
vtkActor
vtkRenderer
vtkRenderWindow
vtkRenderWindowInteractor
其中点数据(Point Data：vtkPoints)定义数据集vtkPolyData的几何结构，单元数据(Cell Data：)定义数据集vtkPolyData的拓扑结构；这样在空间离散的坐标点结合坐标点之间的组合关系，就能描述出多个几何片元信息，用于渲染绘制使用；
#include <vtkLine.h>
#include <vtkPoints.h>
#include <vtkCellArray.h>
#include <iostream>
#include <string>
#include <vector>class Test_Point_Line {public:static void Test() {vtkNew<vtkPoints> points;std::vector<std::string> point_datas = ReadPointsFile("G:\\Data\\points.txt");for (auto it = point_datas.begin(); it != point_datas.end(); ++it) {std::vector<std::string> arr_data = Split(*it, " ");double x = std::atof(arr_data[0].c_str());double y = std::atof(arr_data[1].c_str());double z = std::atof(arr_data[2].c_str());points->InsertNextPoint(x, y, z);}vtkNew<vtkCellArray> lines;lines->InsertNextCell(point_datas.size());for (unsigned long i = 0; i < point_datas.size(); ++i) {lines->InsertCellPoint(i);}vtkNew<vtkPolyData> polyData;polyData->SetPoints(points);polyData->SetLines(lines);vtkNew<vtkPolyDataMapper> polyMapper;polyMapper->SetInputData(polyData);vtkNew<vtkActor> polyActor;polyActor->SetMapper(polyMapper);vtkNew<vtkRenderer> ren1;ren1->AddActor(polyActor);ren1->SetBackground(0.1, 0.2, 0.4);vtkNew<vtkRenderWindow> renWin;renWin->AddRenderer(ren1);renWin->SetSize(300, 300);vtkNew<vtkRenderWindowInteractor> iren;iren->SetRenderWindow(renWin);iren->Initialize();iren->Start();}static std::vector<std::string> ReadPointsFile(const char *path) {ifstream in(path); std::string line;std::vector<std::string> result;if (in) {while (getline(in, line)){result.push_back(line);}}else{cout << "no such file" << endl;}return result;}static std::vector<std::string> Split(const std::string &str, const std::string &pattern) {std::vector<std::string> resVec;if (str.empty()){return resVec;}std::string strs = str + pattern;size_t pos = strs.find(pattern);size_t size = strs.size();while (pos != std::string::npos){resVec.push_back(strs.substr(0, pos));strs = strs.substr(pos + 1, size);pos = strs.find(pattern);}return resVec;}
};
当使用SetVerts函数指明输入拓扑结构为点集合时，将绘制出离散点在空间中的显示；
vtkNew<vtkPolyData> polyData;polyData->SetPoints(points);polyData->SetVerts(lines);
使用的points文件路径：https://download.csdn.net/download/liushao1031177/19134425
参考文献
1.vtkPoints Class Reference
2.vtkCellArray Class Reference
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