VTK 实例19：用vtkImageCanvasSource2D创建图像

 1 #include "vtkAutoInit.h" 
 2 VTK_MODULE_INIT(vtkRenderingOpenGL2);
 3 VTK_MODULE_INIT(vtkInteractionStyle);
 4 
 5 #include <vtkSmartPointer.h>
 6 #include <vtkImageData.h>
 7 #include <vtkImageCanvasSource2D.h>
 8 #include <vtkRenderWindow.h>
 9 #include <vtkRenderWindowInteractor.h>
10 #include <vtkInteractorStyleImage.h>
11 #include <vtkRenderer.h>
12 #include <vtkImageActor.h>
13 
14 int main()
15 {
16     //定义一个vtkImageCanvasSource2D类型对象canvas
17     vtkSmartPointer<vtkImageCanvasSource2D> canvas =
18         vtkSmartPointer<vtkImageCanvasSource2D>::New();
19     //设置画布的像素数据类型为UnsignedChar
20     canvas->SetScalarTypeToUnsignedChar();
21     //设置组分数目
22     canvas->SetNumberOfScalarComponents(1);
23     //设置画布的大小
24     canvas->SetExtent(0, 100, 0, 100, 0, 0);
25     //利用SetDrawColor方法设置绘制矩形颜色
26     canvas->SetDrawColor(0, 0, 0, 0);//黑色
27     //利用FillBox方法在画布中绘制矩形
28     canvas->FillBox(0,100,0,100);
29     canvas->SetDrawColor(255, 0, 0, 0);//白色
30     canvas->FillBox(20,40,20,40);
31     canvas->Update();
32 
33     // Create actors
34     vtkSmartPointer<vtkImageActor> redActor =
35         vtkSmartPointer<vtkImageActor>::New();
36     //redActor->SetInput(canvas->GetOutput());
37     redActor->SetInputData(canvas->GetOutput());
38 
39     // Define viewport ranges
40     // (xmin, ymin, xmax, ymax)
41     double redViewport[4] = {0.0, 0.0, 1.0, 1.0};
42     // Setup renderers
43     vtkSmartPointer<vtkRenderer> redRenderer =
44         vtkSmartPointer<vtkRenderer>::New();
45     redRenderer->SetViewport(redViewport);
46     redRenderer->AddActor(redActor);
47     redRenderer->ResetCamera();
48     redRenderer->SetBackground(1.0, 1.0, 1.0);
49 
50     // Setup render window
51     vtkSmartPointer<vtkRenderWindow> renderWindow =
52         vtkSmartPointer<vtkRenderWindow>::New();
53     renderWindow->AddRenderer(redRenderer);
54     renderWindow->SetSize( 640, 480 );
55     renderWindow->Render();
56     renderWindow->SetWindowName("ImageCanvasSource2D");
57 
58     // Setup render window interactor
59     vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
60         vtkSmartPointer<vtkRenderWindowInteractor>::New();
61     vtkSmartPointer<vtkInteractorStyleImage> style =
62         vtkSmartPointer<vtkInteractorStyleImage>::New();
63 
64     renderWindowInteractor->SetInteractorStyle(style);
65     // Render and start interaction
66     renderWindowInteractor->SetRenderWindow(renderWindow);
67     renderWindowInteractor->Initialize();
68     renderWindowInteractor->Start();
69 
70     return EXIT_SUCCESS;
71 }