【vtkWidgetRepresentation】第七期 vtkImplicitPlaneRepresentation

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前言

本文分享vtkImplicitPlaneRepresentation源码剖析，及相关的实例，该接口主要用于切割交互，希望对各位小伙伴有所帮助！

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前言

1. vtkImplicitPlaneRepresentation介绍

2. vtkImplicitPlaneRepresentation关键参数介绍

3. 相关的应用实例

结论：

vtkImplicitPlaneRepresentation

1. vtkImplicitPlaneRepresentation介绍

继承自vtkWidgetRepresentation，但与vtkFinitePlaneRepresentation很相似。该类在BoundingBox中通过SetOrigin和SetNormal定义有界平面。可以通过vtkImplicitPlaneWidget2进行该平面的交互。其子类vtkImplicitImageRepresentation在版本9.0.3中并没有，最近的版本9.3.2中存在。有兴趣的小伙伴可以自行查看。

2. vtkImplicitPlaneRepresentation关键参数介绍

2.1 定义平面

SetOrigin和SetNormal进行平面的定义。

提供了XY、YZ、XZ平面的简单创建方法：SetNormalToXAxis,SetNormalToYAxis,SetNormalToZAxis.

也可以将平面的法向固定垂直于Camera，SetLockNormalToCamera。

2.2 平面Representation的设置

该部分同vtkFinitePlaneRepresentation，包括：

SetTubing，平面的边界是否采用圆形管道表示。

SetDrawPlane，是否显示平面。

SetDrawOutLine，是否显示平面边界。

SetOutlineTranslation，是否允许通过左键移动轮廓。

SetConstrainToWidgetBounds，设置为TRUE时，平面的原点不允许移动到边界之外；设置为FALSE时，则可以自由移动。

SetScale，是否允许缩放。

2.3 GetPolyData获取切割结果

2.4 GetPlane获取平面

2.5 获取属性并设置

包括GetNormalProperty、GetSelectedNormalProperty；

GetPlaneProperty，GetSelectedPlaneProperty；GetOutlineProperty，GetSelectedOutlineProperty；GetEdgeProperty；

3. 相关的应用实例

#include <vtkSmartPointer.h>

#include <vtkXMLPolyDataReader.h>
#include <vtkSphereSource.h>
#include <vtkClipPolyData.h>
#include <vtkPlane.h>

#include <vtkCommand.h>
#include <vtkImplicitPlaneWidget2.h>
#include <vtkImplicitPlaneRepresentation.h>

#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

// Callback for the interaction
// This does the actual work: updates the vtkPlane implicit function.
// This in turn causes the pipeline to update and clip the object.
class vtkIPWCallback : public vtkCommand
{
public:
  static vtkIPWCallback *New()
    { return new vtkIPWCallback; }
  virtual void Execute(vtkObject *caller, unsigned long, void*)
  {
    vtkImplicitPlaneWidget2 *planeWidget =
      reinterpret_cast<vtkImplicitPlaneWidget2*>(caller);
    vtkImplicitPlaneRepresentation *rep =
      reinterpret_cast<vtkImplicitPlaneRepresentation*>(planeWidget->GetRepresentation());
    rep->GetPlane(this->Plane);
  }
  vtkIPWCallback():Plane(0),Actor(0) {}
  vtkPlane *Plane;
  vtkActor *Actor;

};

int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetRadius(10.0);

  vtkSmartPointer<vtkXMLPolyDataReader> reader =
    vtkSmartPointer<vtkXMLPolyDataReader>::New();

  // Setup a visualization pipeline
  vtkSmartPointer<vtkPlane> plane =
    vtkSmartPointer<vtkPlane>::New();
  vtkSmartPointer<vtkClipPolyData> clipper =
    vtkSmartPointer<vtkClipPolyData>::New();
  clipper->SetClipFunction(plane);
  clipper->InsideOutOn();
  if (argc < 2)
  {
    clipper->SetInputConnection(sphereSource->GetOutputPort());
  }
  else
  {
    reader->SetFileName(argv[1]);
    clipper->SetInputConnection(reader->GetOutputPort());
  }

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(clipper->GetOutputPort());
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  vtkSmartPointer<vtkProperty> backFaces =
    vtkSmartPointer<vtkProperty>::New();
  backFaces->SetDiffuseColor(.8, .8, .4);

  actor->SetBackfaceProperty(backFaces);

  // A renderer and render window
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  renderer->AddActor(actor);

  // An interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderWindow->Render();

  // The callback will do the work
  vtkSmartPointer<vtkIPWCallback> myCallback =
    vtkSmartPointer<vtkIPWCallback>::New();
  myCallback->Plane = plane;
  myCallback->Actor = actor;

  vtkSmartPointer<vtkImplicitPlaneRepresentation> rep =
    vtkSmartPointer<vtkImplicitPlaneRepresentation>::New();
  rep->SetPlaceFactor(1.25); // This must be set prior to placing the widget
  rep->PlaceWidget(actor->GetBounds());
  rep->SetNormal(plane->GetNormal());

  vtkSmartPointer<vtkImplicitPlaneWidget2> planeWidget =
    vtkSmartPointer<vtkImplicitPlaneWidget2>::New();
  planeWidget->SetInteractor(renderWindowInteractor);
  planeWidget->SetRepresentation(rep);
  planeWidget->AddObserver(vtkCommand::InteractionEvent,myCallback);

  // Render

  renderWindowInteractor->Initialize();
  renderWindow->Render();
  planeWidget->On();

  // Begin mouse interaction
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}