【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 pipelinevtkSmartPointer<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 actorvtkSmartPointer<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 windowvtkSmartPointer<vtkRenderer> renderer =vtkSmartPointer<vtkRenderer>::New();vtkSmartPointer<vtkRenderWindow> renderWindow =vtkSmartPointer<vtkRenderWindow>::New();renderWindow->AddRenderer(renderer);renderer->AddActor(actor);// An interactorvtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =vtkSmartPointer<vtkRenderWindowInteractor>::New();renderWindowInteractor->SetRenderWindow(renderWindow);renderWindow->Render();// The callback will do the workvtkSmartPointer<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 widgetrep->PlaceWidget(actor->GetBounds());rep->SetNormal(plane->GetNormal());vtkSmartPointer<vtkImplicitPlaneWidget2> planeWidget =vtkSmartPointer<vtkImplicitPlaneWidget2>::New();planeWidget->SetInteractor(renderWindowInteractor);planeWidget->SetRepresentation(rep);planeWidget->AddObserver(vtkCommand::InteractionEvent,myCallback);// RenderrenderWindowInteractor->Initialize();renderWindow->Render();planeWidget->On();// Begin mouse interactionrenderWindowInteractor->Start();return EXIT_SUCCESS;
}