vtkImageStencilData怎么赋值调用的
时间: 2024-03-09 07:48:49 浏览: 27
vtkImageStencilData是用于描述图像区域的数据结构,通常用于图像处理中的图像剪切、遮罩等操作。对于vtkImageStencilData的赋值和调用需要进行以下步骤:
1. 创建vtkImageStencilData对象
```cpp
vtkSmartPointer<vtkImageStencilData> stencilData = vtkSmartPointer<vtkImageStencilData>::New();
```
2. 设置图像数据
```cpp
vtkImageData* imageData = ... //获取图像数据
stencilData->SetInputData(imageData);
```
3. 定义区域
```cpp
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
//添加点
points->InsertNextPoint(0, 0, 0);
points->InsertNextPoint(0, 10, 0);
points->InsertNextPoint(10, 10, 0);
points->InsertNextPoint(10, 0, 0);
vtkSmartPointer<vtkPolygon> polygon = vtkSmartPointer<vtkPolygon>::New();
//设置区域
polygon->GetPointIds()->SetNumberOfIds(4);
polygon->GetPointIds()->SetId(0, 0);
polygon->GetPointIds()->SetId(1, 1);
polygon->GetPointIds()->SetId(2, 2);
polygon->GetPointIds()->SetId(3, 3);
vtkSmartPointer<vtkCellArray> polygons = vtkSmartPointer<vtkCellArray>::New();
polygons->InsertNextCell(polygon);
vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
polyData->SetPoints(points);
polyData->SetPolys(polygons);
stencilData->SetStencil(polyData);
```
4. 调用Stencil函数
```cpp
stencilData->Update();
```
5. 获取输出
```cpp
vtkImageData* output = stencilData->GetOutput();
```
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