1 /**
2 * @file main.cpp
3 * @brief vtk世界坐标拾取器
4 * @author 禅元天道(chanyuantiandao@126.com)
5 * @version 1.0.0
6 * @date 2022-07-19
7 */
8 #include <vtkActor.h>
9 #include <vtkInteractorStyleTrackballCamera.h>
10 #include <vtkNamedColors.h>
11 #include <vtkNew.h>
12 #include <vtkObjectFactory.h>
13 #include <vtkPolyDataMapper.h>
14 #include <vtkProperty.h>
15 #include <vtkRenderWindow.h>
16 #include <vtkRenderWindowInteractor.h>
17 #include <vtkRenderer.h>
18 #include <vtkRendererCollection.h>
19 #include <vtkSphereSource.h>
20 #include <vtkWorldPointPicker.h>
21
22 #include "vtkAutoInit.h"
23 VTK_MODULE_INIT(vtkRenderingOpenGL2);
24 VTK_MODULE_INIT(vtkInteractionStyle);
25 VTK_MODULE_INIT(vtkRenderingFreeType)
26
27 namespace {
28
29 // Define interaction style
30 class MouseInteractorStyle : public vtkInteractorStyleTrackballCamera
31 {
32 public:
33 static MouseInteractorStyle* New();
34 vtkTypeMacro(MouseInteractorStyle, vtkInteractorStyleTrackballCamera);
35
36 virtual void OnLeftButtonDown() override
37 {
38 // 鼠标点击点
39 std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0]
40 << " " << this->Interactor->GetEventPosition()[1] << std::endl;
41
42 this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],
43 this->Interactor->GetEventPosition()[1], 0, // 二维世界，z为0
44 this->Interactor->GetRenderWindow()
45 ->GetRenderers()
46 ->GetFirstRenderer());
47
48 // 获取世界坐标值
49 double picked[3];
50 this->Interactor->GetPicker()->GetPickPosition(picked);
51
52 std::cout << "Picked value: " << picked[0] << " " << picked[1] << " "
53 << picked[2] << std::endl;
54
55 // 事件转发
56 vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
57 }
58 };
59 vtkStandardNewMacro(MouseInteractorStyle);
60
61 } // namespace
62
63
64 int main()
65 {
66 vtkNew<vtkNamedColors> colors;
67
68 vtkNew<vtkSphereSource> sphereSource;
69 sphereSource->Update();
70
71 vtkNew<vtkPolyDataMapper> mapper;
72 mapper->SetInputConnection(sphereSource->GetOutputPort());
73 vtkNew<vtkActor> actor;
74 actor->SetMapper(mapper);
75 actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());
76
77 vtkNew<vtkRenderer> renderer;
78 vtkNew<vtkRenderWindow> renderWindow;
79 renderWindow->AddRenderer(renderer);
80 renderWindow->SetWindowName("WorldPointPicker");
81
82 // ①世界坐标拾取器
83 vtkNew<vtkWorldPointPicker> worldPointPicker;
84 vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
85 // ②设置拾取器
86 renderWindowInteractor->SetPicker(worldPointPicker);
87 renderWindowInteractor->SetRenderWindow(renderWindow);
88
89 // ③设置交互样式，处理事件
90 vtkNew<MouseInteractorStyle> style;
91 renderWindowInteractor->SetInteractorStyle(style);
92
93 renderer->AddActor(actor);
94 renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
95
96 renderWindow->Render();
97 renderWindowInteractor->Start();
98
99 return EXIT_SUCCESS;
100 }
