VTK图像创建

图像源source创建图像：

#include <vtkAutoInit.h>      
VTK_MODULE_INIT(vtkRenderingOpenGL2);

#include<vtkSmartPointer.h>
#include<vtkImageCanvasSource2D.h>
#include<vtkImageData.h>
#include<vtkImageActor.h>
#include<vtkRenderer.h>
#include<vtkRenderWindow.h>
#include<vtkRenderWindowInteractor.h>
#include<vtkInteractorStyleImage.h>

int main()
{
	vtkSmartPointer<vtkImageCanvasSource2D> canvas =
		vtkSmartPointer<vtkImageCanvasSource2D>::New();
	canvas->SetScalarTypeToUnsignedChar();
	canvas->SetNumberOfScalarComponents(1);
	canvas->SetExtent(0, 100, 0, 100, 0, 0);
	canvas->SetDrawColor(0, 0, 0, 0);
	canvas->FillBox(0, 100, 0, 100);
	canvas->SetDrawColor(255, 0, 0, 0);
	canvas->FillBox(20, 40, 20, 40);
	canvas->Update();  //这一步必不可少

	//创建演员
	vtkSmartPointer<vtkImageActor> actor =
		vtkSmartPointer<vtkImageActor>::New();
	actor->SetInputData(canvas->GetOutput());
	//定义视窗
	double viewport[4] = { 0,0,1,1 };
	vtkSmartPointer<vtkRenderer> renderer =
		vtkSmartPointer<vtkRenderer>::New();
	renderer->SetViewport(viewport);
	renderer->AddActor(actor);
	renderer->ResetCamera();
	renderer->SetBackground(1.0, 1.0, 1.0);

	//设置渲染窗口（搬上舞台）
	vtkSmartPointer<vtkRenderWindow> renderwindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderwindow->AddRenderer(renderer);
	renderwindow->SetSize(640, 480);
	renderwindow->Render();
	renderwindow->SetWindowName("ImageCanvasSource2D");

	//设置窗口交互（演员-观众）
	vtkSmartPointer<vtkRenderWindowInteractor> rwi =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	vtkSmartPointer<vtkInteractorStyleImage> style =
		vtkSmartPointer<vtkInteractorStyleImage>::New();
	rwi->SetInteractorStyle(style);
	rwi->SetRenderWindow(renderwindow);
	rwi->Initialize();
	rwi->Start();

	return 0;
}

手动创建图像

#include <vtkAutoInit.h>      
VTK_MODULE_INIT(vtkRenderingOpenGL2);

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyle.h>

#include <vtkInformation.h>

int main()
{
	vtkSmartPointer<vtkImageData> img =
		vtkSmartPointer<vtkImageData>::New();
	vtkSmartPointer<vtkInformation> info =
		vtkSmartPointer<vtkInformation>::New();
	img->SetDimensions(16, 16, 1);
	img->SetScalarType(VTK_UNSIGNED_CHAR, info);
	img->SetNumberOfScalarComponents(1, info);//每个像素需要表示的组份 =1是指标量图
	img->AllocateScalars(info);//很重要


	unsigned char* ptr = NULL;
	ptr = (unsigned char*)img->GetScalarPointer();

	for (int i = 0; i < 16 * 16 * 1; i++)
	{
		*ptr++ = i % 256;
	}
	///启动渲染引擎
	vtkSmartPointer<vtkImageActor> actor =
		vtkSmartPointer<vtkImageActor>::New();
	actor->SetInputData(img);

	double viewport[4] = { 0,0,1,1 };
	vtkSmartPointer<vtkRenderer> render =
		vtkSmartPointer<vtkRenderer>::New();
	render->SetViewport(viewport);
	render->AddActor(actor);
	render->ResetCamera();
	render->SetBackground(1.0, 0.0, 0.0); // 红色
	render->GradientBackgroundOn();       // 打开渐变背景
	render->SetBackground2(0.0, 0.0, 1.0); // 蓝色


	vtkSmartPointer<vtkRenderWindow> window =
		vtkSmartPointer<vtkRenderWindow>::New();
	window->AddRenderer(render);
	window->SetSize(640, 480);
	window->Render();
	window->SetWindowName("CreateVTKImageData");

	vtkSmartPointer<vtkRenderWindowInteractor> rwi =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	vtkSmartPointer<vtkInteractorStyle> style =
		vtkSmartPointer<vtkInteractorStyle>::New();
	rwi->SetInteractorStyle(style);
	rwi->SetRenderWindow(window);
	rwi->Initialize();
	rwi->Start();

	return 0;
}