[C++知识库]vtkFloatArray vtkDataArray

vtkFloatArray 继承了vtkDataArray

vtkDataArray存放了连续元素，每components个连续元素组成一个tuple

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vtkFloatArray可以作为vtkPoints的内部实际存放数据的载体

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkFloatArray.h>
#include <vtkNew.h>
#include <iostream>

int main(int argc, char* argv[])
{
    vtkNew<vtkFloatArray> pcoords;

    // Note that by default, an array has 1 component.
    // We have to change it to 3 for points
    pcoords->SetNumberOfComponents(3);
    // We ask pcoords to allocate room for at least 4 tuples
    // and set the number of tuples to 4.
    pcoords->SetNumberOfTuples(4);
    // Assign each tuple. There are 5 specialized versions of SetTuple:
    // SetTuple1 SetTuple2 SetTuple3 SetTuple4 SetTuple9
    // These take 1, 2, 3, 4 and 9 components respectively.
    float pts[4][3] = { {0.0, 0.0, 0.0}, {0.0, 1.0, 0.0},
                        {1.0, 0.0, 0.0}, {1.0, 1.0, 0.0} };
    for (int i = 0; i < 4; i++)
    {
         pcoords->SetTuple(i, pts[i]);
    }
    // Create vtkPoints and assign pcoords as the internal data array.
    vtkNew<vtkPoints> points;
    points->SetData(pcoords);

    for (int i = 0; i < points->GetNumberOfPoints(); i++)
    {
        auto p = points->GetPoint(i);
        std::cout<<"point["<<i<<"]= ("
            << p[0] << ", "
            << p[1] << ", "
            << p[2] << ")"
            <<std::endl;
    }

    return EXIT_SUCCESS;
}

point[0]= (0, 0, 0)
point[1]= (0, 1, 0)
point[2]= (1, 0, 0)
point[3]= (1, 1, 0)

参考：vtkDoubleArray(vtkFloatArray) vtkIntArray使用_leemengfei的博客-CSDN博客

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