vtk获取鼠标光标处的坐标
时间: 2023-09-12 22:10:07 浏览: 109
要获取鼠标光标处的坐标,可以使用 VTK 的 vtkRenderWindowInteractor 类。具体操作如下:
1. 创建一个 vtkRenderWindowInteractor 对象,并将其设置为 vtkRenderWindow 的交互器:
```
vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
```
2. 将交互器添加到场景中:
```
interactor->Initialize();
```
3. 创建一个 vtkPropPicker 对象,并将其设置为交互器的 picker:
```
vtkSmartPointer<vtkPropPicker> picker = vtkSmartPointer<vtkPropPicker>::New();
interactor->SetPicker(picker);
```
4. 为交互器添加鼠标事件监听器,监听鼠标移动事件:
```
vtkSmartPointer<MouseInteractor> mouseInteractor = vtkSmartPointer<MouseInteractor>::New();
mouseInteractor->SetPicker(picker);
interactor->AddObserver(vtkCommand::MouseMoveEvent, mouseInteractor);
```
其中,MouseInteractor 是一个自定义的鼠标事件监听器,用于处理鼠标移动事件。具体实现可以参考下面的代码。
5. 在自定义的鼠标事件监听器中实现获取鼠标光标处的坐标:
```
class MouseInteractor : public vtkCommand
{
public:
static MouseInteractor* New()
{
return new MouseInteractor;
}
void SetPicker(vtkPropPicker* picker)
{
picker_ = picker;
}
void Execute(vtkObject* caller, unsigned long eventId, void* callData) override
{
vtkRenderWindowInteractor* interactor = vtkRenderWindowInteractor::SafeDownCast(caller);
int x = interactor->GetEventPosition()[0];
int y = interactor->GetEventPosition()[1];
vtkRenderer* renderer = interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer();
picker_->PickProp(x, y, renderer);
double* pos = picker_->GetPickPosition();
std::cout << "Mouse position: " << pos[0] << ", " << pos[1] << ", " << pos[2] << std::endl;
}
private:
vtkPropPicker* picker_;
};
```
在 Execute 方法中,首先获取鼠标光标在窗口中的坐标,然后使用 picker_ 对象获取鼠标光标处的坐标,并输出到控制台中。