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122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkFrustumSource.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkFrustumSource
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* @brief create a polygonal representation of a frustum
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*
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* vtkFrustumSource creates a frustum defines by a set of planes. The frustum
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* is represented with four-sided polygons. It is possible to specify extra
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* lines to better visualize the field of view.
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*
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* @par Usage:
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* Typical use consists of 3 steps:
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* 1. get the planes coefficients from a vtkCamera with
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* vtkCamera::GetFrustumPlanes()
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* 2. initialize the planes with vtkPlanes::SetFrustumPlanes() with the planes
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* coefficients
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* 3. pass the vtkPlanes to a vtkFrustumSource.
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*/
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#ifndef vtkFrustumSource_h
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#define vtkFrustumSource_h
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#include "vtkFiltersSourcesModule.h" // For export macro
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#include "vtkPolyDataAlgorithm.h"
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class vtkPlanes;
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class VTKFILTERSSOURCES_EXPORT vtkFrustumSource : public vtkPolyDataAlgorithm
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{
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public:
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static vtkFrustumSource* New();
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vtkTypeMacro(vtkFrustumSource, vtkPolyDataAlgorithm);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@{
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/**
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* Return the 6 planes defining the frustum. Initial value is nullptr.
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* The 6 planes are defined in this order: left,right,bottom,top,far,near.
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* If Planes==nullptr or if Planes->GetNumberOfPlanes()!=6 when RequestData()
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* is called, an error message will be emitted and RequestData() will
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* return right away.
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*/
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vtkGetObjectMacro(Planes, vtkPlanes);
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//@}
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/**
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* Set the 6 planes defining the frustum.
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*/
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virtual void SetPlanes(vtkPlanes* planes);
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//@{
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/**
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* Tells if some extra lines will be generated. Initial value is true.
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*/
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vtkGetMacro(ShowLines, bool);
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vtkSetMacro(ShowLines, bool);
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vtkBooleanMacro(ShowLines, bool);
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//@}
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//@{
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/**
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* Length of the extra lines. This a stricly positive value.
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* Initial value is 1.0.
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*/
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vtkGetMacro(LinesLength, double);
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vtkSetMacro(LinesLength, double);
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//@}
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/**
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* Modified GetMTime because of Planes.
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*/
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vtkMTimeType GetMTime() override;
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//@{
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/**
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* Set/get the desired precision for the output points.
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* vtkAlgorithm::SINGLE_PRECISION - Output single-precision floating point.
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* vtkAlgorithm::DOUBLE_PRECISION - Output double-precision floating point.
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*/
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vtkSetMacro(OutputPointsPrecision, int);
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vtkGetMacro(OutputPointsPrecision, int);
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//@}
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protected:
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/**
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* Default constructor. Planes=nullptr. ShowLines=true. LinesLength=1.0.
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*/
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vtkFrustumSource();
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~vtkFrustumSource() override;
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int RequestData(vtkInformation* request, vtkInformationVector** inputVector,
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vtkInformationVector* outputVector) override;
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/**
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* Compute the intersection of 3 planes.
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*/
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void ComputePoint(int planes[3], double* pt);
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vtkPlanes* Planes;
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bool ShowLines;
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double LinesLength;
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int OutputPointsPrecision;
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private:
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vtkFrustumSource(const vtkFrustumSource&) = delete;
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void operator=(const vtkFrustumSource&) = delete;
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};
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#endif
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